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SERVICE MANUAL

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1. UAI Fd LL Ps see E Rn seg PRA en m P fr IN a EE m x m w w m m x x x x m w n z i t ca t Faj i eH 1 E lt TE UF i E N i Hm x Es e i 554 i s ania DH E t PE a m CIES 5 3 d LETT TRE TES J
2. Contrast Drive E Attenuation Attenuation 2 4 Contrast Contrast E Attenuation Attenuation Mc Contrast Contrast N Attenuation Attenuation A2 1 Red Drive Adjust Green Drive Adjust Blue Drive Adjust RGB Cutoff Adjust Red Clamp Cap Red Video Out Vcc2 Ground Green Video Out Green Clamp Cap Blue Video Out Blue Clamp Cap Blank Gate Clamp Gate Figure 1 shows the block diagram of LM1281 in conformity with the pin layout of the IC Every channel accepts both the video signal and the OSD signal at the input anplifier A1 Also the video OSD changeover signal passes either the video signal or the OSD signal through LM1281 or is connected with the input amplifier for control purposes The next contrast adjustment block is a drive adjustment type one The reference level for the DC return circuit is set by means of the RGB cutoff adjustment pin PIN 25 Attention must be paid to the fact that the blank clamp gate is active when it is stuck at the LOW state Under ordinary circumstances these pins are controlled by means of the standard TTL signal 65 Test Circuits OSD INPUT SELECT R1 RED OSD INPUT i ANN 1 2 GREEN OSD INPUT 1 c ANY 1 R3 BLUE OSD INPUT 1 1 RED VIDEO IN GREEN VIDEO IN
3. gt gt H V Freq Counter H Polarity Sync Mux HSYNC gt detect gt Separator gt d XE H V SEF SYNC Y Generator P Mux gt V Polarity Lp p detect amp control VSO Mux VSYNC 4 t P I Hav TEST Pattern gt PB3 PAT Generator y PB3 jJ Composite Sync Signal Separation The composite sync signal comes from HSYNC pin and is separated by the sync separator The operations of sync separator are detect the polarity and covert composite sync signal to positive polarity extract Vsync Pulse width less than 8us will be filtered but the Vsync will be widened about 8us count the pulses during the separated Vsync is low and save the counter value N bypass the composite sync pulses before the counter equals to N start inserting Hsync pulses after the counter equals to until the separated Vsync is low the period of inserted Hsync is decided by the last two bypassed Hsync the pulse width of the inserted Hsync is 2us Positive H V JUILILILILILILILILITLILILE UU LILILIL Separated Hsync IL JL JL TL TJLTUIJL TL TL JU TL TU JE TL TL JL TL IL lt 4 Separated Vsync decide whether the HSYNC input is a composite sync signal program should check the fre quency of VSYNC first reset H V bit to 0 If the VSYNC frequency is low
4. o FA330150 CARBON 1 2W T 5 15ohm 241002 1 4W T 1 10Kohm 40132 FB246040 1 4W T 1 6040hm FB246490 1 4W T 1 6490hm MAIN BOARD FB247320 METAL 1 4W T 1 732 730 BOARD FB241372 METAL 1 4W T 1 13 7 731 MAIN BOARD FA040153 1 8W T 5 15Kohm 732 MAIN BOARD 240154 CARBON 1 4W T 5 150Kohm MAIN BOARD FA240224 CARBON 1 4W T 5 220Kohm MAIN BOARD 040474 CARBON 1 8W T 5 470Kohm 735 MAIN BOARD 040105 1 8W T 5 1Mohm FA330105 CARBON 1 2W T 5 1Mohm 723 MAIN BOARD A 040472 CARBON 1 8W T 5 4 7Kohm 5 MAIN BOARD MAIN BOARD MAIN BOARD MAIN BOARD MAIN BOARD DID IDiIDIDIDiv CO O Ot MAIN BOARD FA040102 CARBON 1 8W T 5 1Kohm MAIN BOARD FA040472 CARBON 1 8W T 5 4 7Kohm 738 MAIN BOARD FA040472 CARBON 1 8W T 5 4 7Kohm MAIN BOARD 040224 CARBON 1 8W T 5 220Kohm MAIN BOARD FA040103 CARBON 1 8W T 5 10Kohm MAIN BOARD 040472 CARBON 1 8W T 5 4 7Kohm 86 MAIN BOARD FA040473 1 8W T 5 47Kohm R407 11 743 MAIN BOARD 040471 1 8W T 5 4700hm R408 1 MAIN BOARD FA040473 CARBON 1 8W T 5 47Kohm R409 MAIN BOARD FB246801
5. 53 5 ASSY 15200031 LABEL REV name Pure osr 1 55 SET ASSY 15200471 LABEL WARNING 27 5KV 600uA 1 565 1200021 12 11 5 55 1200051 RACKETCABLE Se SETASSY 12800202 PLATESHIELDNG VDEO 1211 solsetassy 17000801 cushion pece eaco Jo o Jif olsetassy 8000311 PcBsUPPORT SES o So o dof ilsetassy 8000421 SWTCHEXPANDONGCOVER 114 Ge SETASSY 18000261 ANODECLAMPER SPA11G 2 es sETAssY 1 000361 Horner pcs For Tcocesso 183 REVISED BY ECN NO NN1050002 SORT BY ASSY CODE 97 86 x SMPS HORIZONTAL AND VERTICAL SYNC PROCESSOR LM1290 LM1295 SYSTEM ARCHITECTURE MCU E ROM DDC WT6016 24C04 gt H V EW OUT amp HOUT V GEOMETRY DYNAMIC FOCUSING o lt B MOTHER BOARD 843 TT R GB VERT OUT TDA 4866 HOR DEFLECT STAGE RGB OUT LM2438 CUT OFF CUT OFF INVH9VIG 490148 SCHEMATIC DIAGRAMS 1 Video Board 2 8 CONTRAST CLAMP GND
6. 0017 Dionem N30 do faj DIODE T 1N4148 1 365 MAINBOARD EJA05819 DIODE 40 faj 366 EvACOO18 pionen 1 4937 dooa faj 367 BOARD EJ044148 DIODE T 1N4148 368 MAINBOARD A EJACOO18 DIODET 1A 1N4987 1 DIODE T 1N4148 1 S70 MAINBOARD AN EJA05819 DIODE 40 35 1 79 371 MAIN BOARD EJ044148 DIODE T 1N4148 MAIN BOARD EJ044148 DIODE T 1N4148 373 MAIN BOARD EJ044148 DIODE T 1N4148 MAIN BOARD EJAC0018 375 VAIN BOARD EJ044148 DIODE T 1N4148 MAIN BOARD EJ044148 MAIN BOARD EJ044148 378 MAIN BOARD EJACOO18 379 MAIN BOARD 044148 DIODE T 1N4148 380 MAIN BOARD EJAC0018 MAIN EJAC0018 DIODE T 1 1N4937 382 MAIN BOARD 044148 T 1N4148 MAIN BOARD EJACO018 MAIN BOARD EJO44148 MAIN BOARD EJA20003 386 MAIN BOARD EJACO018 MAIN BOARD EJACO018 MAIN BOARD EJAC0018 MAIN BOARD 044148 DIODE T 1N4148 MAIN BOARD EJ044148 MAIN BOARD EJ044148 MAIN BOARD 0018 393 MAIN BOARD J044148 DIODE T 1N4148 MAIN BOARD 044148 MAIN 044148 DIODE T 1N4148 MAIN 044148 DIODE T 114148 MAIN BOARD 044148 DIODE T 1N4148 MAI
7. GA310725 ELECT 850C T ors 1 337 MAINBOARD AN GA322555 ELECT 8500 7 22050 1 338 MAINBOARD GB633052 cERAMIC SUT33P SOV J ovs 114 339 GB633052 cERAMIC SUT33P SOV J 06 11 340 GB610152 cERAMIC SLT 100 50 07 11 S4i MAINBOARD AI GB610152 cERAMICSUT 100 50 008 342 MAINBOARD GB910358 25 0 0102 04 343 MAIN BOARD GA347625 ELECT 850C T 47u 16V M 344 MAINBOARD GA310655 ELECT 850C T 1owsovM 06 1 945MAINBOARD AI GA310655 ELECT 850C T 1owsovM jz Jij S46 MAINBOARD A GA310655 ELECT 850C T 1owsovM 67386 1 347 MAINBOARD AI EJA20003 9 95 1 348 MAINBOARDA 0017 DIODET1A1N4936_ o faj DIODE 1N4148 1 350 BOARD An EVACOO17 Dionem 1n4986 mos faj 351 MAIN BOARD EJ044148 DIODE T 1N4148 DIODE 1N4148 353 MAINBOARD AN EJA20003 DiODET 1aBAa159 dne 1 DIODE 1N4148 puz 1 DIODE 1N4148 pno 1 DIODE 154148 pizo 1 357 0018 DIODET iA 1 4937 da DIODE 144148 359 MAIN BOARD EJ044148 DIODE T 1N4148 DIODE 1N4148 DIODE T 1N4148 DIODE T 1N4148 363
8. 30 31 PA4 DA12 lO Port 4 or D A converter 12 Same as 31 32 PA5 DA13 Port 5 or D A converter 13 Same as 32 33 PA6 VSO WO Port A6 VSYNC OUT This pin be the output of VSYNC or an I O pin When as an pin it is same as PAO 33 34 PA7 HSO Port A7 HSYNC OUT This pin can be the output of HSYNC or an I O pin When pin it is same PAO 34 35 DA7 O D A converter 7 Open drain output External applied voltage can up to 10V 35 36 6 O D A converter 6 Open drain output External applied voltage can up to 10V 36 38 DA5 O D A converter 5 Open drain output External applied voltage can up to 10V 37 39 DA4 O D A converter 4 Open drain output External applied voltage can up to 10V 38 40 DA3 O D A converter 3 Open drain output External applied voltage can up to 10V 39 41 HSYNC JHSYNC input Schmitt trigger input 40 42 VSYNC VSYNC input Schmitt trigger input 48 SYNC Processor The SYNC processor can 1 separate the composite sync signal 2 calculate HSYNC and VSYNG frequencies 3 detect polarities of HSYNC and VSYNC input 4 control the output polarities of HSO and VSO pin 5 generate free running horizontal and vertical sync signals for burn in test 6 generate self test pattern signal
9. 7 5mm CRT BOARD R0319110 JUMPER WIRE 10mm CRT BOARD R0319110 JUMPER WIRE 7 5mm CRT BOARD R0319110 JUMPER WIRE 7 5mm CRT BOARD R0319110 JUMPER WIRE 15mm CRT BOARD R0319110 JUMPER WIRE 7 5mm i di c lt c c c c c c 74 cic cic m m ro m o 9 108 R0319110 JUMPER WIRE 7 5mm i 116 CRT BOARD R0319110 JUMPER WIRE 7 5mm FA040473 CARBON 1 8W T 5 47Kohm 124 CRT BOARD 040101 CARBON 1 8W T 5 100 R202 1 FA040101 CARBON 1 8W T 5 4 7Kohm CARBON 1 8W T 5 1 5Kohm CRT BOARD FA240103 CARBON 1 4W T 5 10Kohm R206 CRT BOARD FA040101 CARBON 1 8W T 5 100ohm CRT BOARD FA040101 CARBON 1 8W T 5 100ohm Lu i awas y IM om REI ip Wee E up METAL 1 4W T 1 75ohm 132 CRT BOARD FA040330 CARBON 1 8W T 5 33ohm EI ERES FUE a Heu e Lp or E s m qz 2 desir x E s LJ Ep CARBON 1 8W T 5 100ohm CARBON 1 8W T 5 33Kohm CARBON 1 4W T
10. IN NEED 1004 MAIN BOARD INSERT 028000 AT24C04 ATMEL ST U702 1 l 1005 MAIN BOARD INSERT 80008701 IC KS24C041C SAMSUNG 1006 MAIN BOARD INSERT FF300201 CARBON 6mm 200 ohm B 91 1007 MAIN BOARD INSERT rrs10102 VRCARBON6 mm 1K 1 1008 FF310503 MAIN BOARD INSERT FF300103 VR CARBON 6mm 10 VZ067TH1 1010 MAIN BOARD INSERT 0204 1011 MAIN BOARD INSERT 80010021 9701 VE WIRE ASSY wreEassy EM08003 18000321 1014 80001651 CORD POWER 1015 PACKING 11000381 1016 13400491 CARTON 1017 13400501 POLYON L CARTON 1018 PACKING 13700021 1019 13700031 1020 19700071 1021 19700091 1022 13200851 BOX V720 1 B 1023 15500621 1024 15500751 15200331 LABEL SERIAL BARCODE 1026 PACKING 15200251 1027PACKING 19201211 i028 PACKING 15900051 1o29 PACKING 11000381 1030PACKING 1100382 80001661 1032 REVOLVING STAND ASSY 17000291 11000251 1035 11000261 1036 11000262 11000361 1039 5 ASSY 104 SET ASSY 80004551 SAMSUNG M41QAR361X101 A C RT 1042 5 ASSY 0009321 TOSHIBA M41LRT128X401 F4 1043 SET ASSY 0010511 14000011 14000071 1046 14300031 SCREW PL CPIMS 4 10 15BF 14000041 SCREW P 2CBRITS 3 8 15BF 14600011 SCREW SPECIAL 5 25 1049 SET ASSY 1
11. 1 4W T 1 6 8Kohm R410 1 MAIN BOARD 241002 1 4 Jal 7 MAIN BOARD 040134 MAIN BOARD 040224 756 MAIN FA040223 CARBON 1 8 5 22Kohm R440 MAIN BOARD FA040472 CARBON 1 8 5 4 7Kohm R442 63 MAIN BOARD FA040472 CARBON 1 8W T 5 4 7Kohm R452 MAIN BOARD FA040472 CARBON 1 8W T 5 4 7Kohm MAIN BOARD 040472 CARBON 1 8W T 5 4 7Kohm MAIN BOARD FA040102 CARBON 1 8W T 5 1Kohm MAIN BOARD FA040472 CARBON 1 8W T 5 4 7Kohm MAIN BOARD FA040472 CARBON 1 8W T 5 4 7Kohm MAIN BOARD FA040472 CARBON 1 8W T 5 4 7Kohm MAIN BOARD FA040472 CARBON 1 8W T 5 4 7Kohm MAIN BOARD FA040102 CARBON 1 8W T 5 1Kohm MAIN BOARD FA040103 CARBON 1 8W T 5 10Kohm MAIN BOARD FA040152 CARBON 1 8W T 5 1 5Kohm MAIN BOARD 040472 CARBON 1 8W T 5 4 7Kohm 806 BOARD FA240103 CARBON 1 4W T 5 10Kohm MAIN BOARD MAIN MAIN 810 MAIN BOARD MAIN BOARD MAIN BOARD MAIN BOARD 040104 CARBON 1 8W T 5 100Kohm MAIN BOARD FA040471 CARBON 1 8W T 5 4700hm 040242 CARBON 1 8W T 5 2 4Kohm 040472 CARBON 1 8W T 5 4 7Kohm 040472 CARBON 1 8W T 5 4 7Kohm 040472 CARBON 1 8W T 5 4 7Kohm FA040222 CARBON 1 8W T 5 2 2Kohm FA040103 CARBON 1 8W T 5 10Kohm MAIN BOARD
12. 80009321 80010501 folie s 4ojsETASSY 7 14000011 scREW gzcBRITS amp ie isBF FoRBACK 2 SCREW PL CPTS3 8 15BF 2 42 SET ASSY 14300031 SCREW PL CPIMS 4 10 15BF FORBKT CAB 2 55 7 14000031 screw GzCBRTS s iz isBF 44sETASSY 7 17000252 1 SCREW SPECIAL 5 25 4 FIXED CABLE CLIP GL 70A FIXED CABLE CLIP GL 115A 1 SET ASSY 11700221 SUPPORT PC ABS SET ASSY SCREW 2CBRITS 4 12 15BF Er SPACER SUPPROT PS 26GD 94 55 SET ASSY 80001931 17 ROTATION COIL 1 SET ASSY 80005101 WIRE 1618 24AWG 4ommBK 1 SET ASSY SET ASSY ET ASSY A s 62 5 assy 80011261 63 SET ASSY 17000321 CABLE TIES GT 100M TIE 645 assy 15200031 LABEL REV 65 SET assy 115000981 NAME PLATE INSTRUCTION v721 R 66 5 ASSY 15200471 LABELWARNING 275KV euA 1 G7 SETASSY 15200881 LABELSERIALBARCODE Li 685 15200681 LABELTCOss FORCABINET Jo o t Go SETASSY 15200201 LABEL EMC V500P a s 7OSETASSY 7 10000924 CABNETBACK o 1 71 SET ASSY 10101101 CABINET FRONT ASSY PC ABS 1 Te SETASSY 12000281 1 11 7S jSETASSY 1200051 BRACKETCABLE 74sETASSY 12800202 PLATE S
13. li d MAIN INSERT 937 BOARD INSERT 38 MAIN BOARD INSERT 39 BOARD INSERT 940 MAIN BOARD INSERT 941 BOARD INSERT 12800061 942 MAIN BOARD INSERT 14000041 SCREW P 2CBRITS 3 8 15BF 943 MAIN BOARD INSERT 206301 N YTAF630 220 944 BOARD INSERT 470680 MOF 1W M A 5 680hm MAIN BOARD INSERT 560248 2W M A 5 0 240hm MAIN BOARD INSERT FB560278 2W M A 5 0 270hm 947 MAIN BOARD INSERT 570563 2W M B 5 56Kohm MAIN BOARD INSERT 110158 WOUND RES 2W A 5 0 150hm MAIN BOARD INSERT 560103 MOF 2W M A 5 10Kohm MAIN BOARD INSERT 470100 1W M A 5 100hm MAIN BOARD INSERT 560152 2W M A 5 1 5Kohm MAIN BOARD INSERT 030278 WOUND RES 1W M A 5 0 27 953 MAIN BOARD INSERT 470623 1W M A 5 62Kohm R0311D04 80005571 EF206301 EB20861A TR PNP 25 861 TO 220F R0311D04 co 90 MAIN BOARD INSERT 710150 3W M A 5 150hm MOF 2W M A 5 1ohm MOF 2W M A 5 1 2ohm 960 BOARD INSERT FB470270 1 5 27ohm MOF 2W M A 5 330ohm MOF 2W M A 5 200ohm MOF 1W M A 964 MAIN BOARD INSERT 560681 2W M A MAIN INSERT FB470109 MOF 1W M A 5 1ohm 5 39Kohm 5 680ohm 966 MAIN BOARD INSERT FB470
14. Comply with all caution and safety related notes on the product display chassis and picture tube When replacing the component always be certain that all the components are put back in the place When servicing display monitor unit it is required that the provided lead dress is used in the high voltage circuit area It is also recommended that shatter proof goggles are worn when removing installing and han dling the picture tube People not equipped with the proper precautionary measures mentioned should keep the picture tube away from body while handling As for a connector pick and extract housing with fingers properly since a disconnection and improper contacts may occur when wires of the connector are led Use a proper screwdriver If you use screwdriver that does not fit you may damage the screws 5 teu ru DO 1 SPECIFICATIONS uto eta ae RR etti vua vb a a EUM pao Ene AR 3 PIN ABJUSTMENT TABLE 4 PPP E T 5 ON SCHEEN MANAGERIOSMY wel ana a 7 SERIAL NUMBER INFORMATION Ed EE re RR Dr 12 DISASSEMBLDY 13 ADJUSTMENT PROCEDURES 16 WRITE AND INSPECTION FOR
15. FA040471 CARBON 1 8W T 5 4700hm 816 MAIN BOARD FA040101 CARBON 1 8W T 5 1000hm 817 MAIN BOARD FA040101 1 8W T 5 1000hm MAIN BOARD 040101 CARBON 1 8W T 5 1000hm MAIN BOARD FA040101 1 8W T 5 1000hm MAIN BOARD FA040472 CARBON 1 8W T 5 4 7Kohm MAIN BOARD FA040472 CARBON 1 8W T 5 4 7Kohm MAIN BOARD FA040472 MAIN BOARD FA040471 824 MAIN BOARD R0319110 JUMPER WIRE 7 5mm MAIN BOARD EKA0180B MAIN BOARD EKCO180B 827 MAIN BOARD 01201 20102 828 BOARD 01201 20102 MAIN BOARD EKA00507 ZEN DIODE 1 2W T HZS5C2 HITACHI 830 BOARD 00507 DIODE 1 2W T BZX79F5V1 PHILIPS ZD104 831 MAIN BOARD EKA01201 ZEN DIODE 1 2 HZS12A2 HITACHI MAIN EKC01201 MAIN BOARD EKA00507 ZEN DIODE 1 2 834 MAIN BOARD EKC00507 MAIN BOARD 00507 ZEN DIODE 1 2W T 25502 HITACHI 20701 MAIN BOARD 00507 MAIN BOARD 00507 2 DIODE 1 2W T HZS5C2 HITACHI 838 MAIN BOARD 00507 MAIN BOARD 00507 ZEN DIODE 1 2W T 255 2 HITACHI 2070 MAIN 00507 841 BOARD 00507 ZEN DIODE 1 2W T HZS5C2 HITACHI 704 MAIN 00507 843 MAIN BOARD INSERT 14000051 MAIN BOARD INSERT 80000991 BEAD WBR6H 3T R7K B5 845 MAIN BOARD INS
16. FA040473 CARBON 1 8W T 5 47Kohm 703 MAIN BOARD FA040103 CARBON 1 8W T 5 10Kohm 704 MAIN BOARD 040103 CARBON 1 8W T 5 10Kohm MAIN BOARD 040474 CARBON 1 8W T 5 470Kohm 706 MAIN BOARD 040104 CARBON 1 8W T 5 100Kohm MAIN BOARD 040472 CARBON 1 8W T 5 4 7Kohm 708 MAIN BOARD FA330154 CARBON 1 2W T 5 150Kohm 09 MAIN BOARD 241203 1 4W T 1 120Kohm 710 BOARD 242053 1 4W T 1 205Kohm 71 BOARD FA330105 CARBON 1 2W T 5 1Mohm 12 MAIN BOARD FB241872 713 MAIN BOARD FA040103 CARBON 1 8W T 5 10Kohm 714 MAIN BOARD FA040822 CARBON 1 8W T 5 8 2Kohm 715 MAIN BOARD FA040222 CARBON 1 8W T 5 2 2Kohm MAIN BOARD 243161 METAL 1 4W T 1 3 16Kohm MAIN BOARD FB241002 METAL 1 4W T 1 10Kohm MAIN BOARD FA040104 1 8W T 5 100Kohm MAIN BOARD FA040103 CARBON 1 8W T 5 10Kohm MAIN BOARD FA040103 CARBON 1 8W T 5 10Kohm T T DID IDiIDI DIDiv o o CO S o o o m 0o ML JS 5 lt S DID IDiIDIDIDiv 9o o o o 1 Oo o a N 721 MAIN BOARD FA330105 CARBON 1 2W T 5 1Mohm MAIN BOARD o
17. White Picture Black Picture The test pattern signal is generated when SELF and ENPAT are both set to 1 This video signal will synchronize to the free running Hsync and Vsync no matter which frequency is chosen The following diagram shows the timing relationship of cross hatch picture lt LILTI T 31 1kHz i 5 ius 47 9kHz 5 125us 0 625us 64kHz 1 3 62505 0 875 5 51 DDC Interface The DDC interface is a slave mode I C interface with DDC1 function It is fully compatible with VESA DDC1 2B standard The functional block diagram is shown in the below Internal Data Bus Data Buffer 1 MUX MUX Shift Register L l UT Address Compare gt ADDR START MSB START STOP Detect x 1010000 STOP i Handshake Control gt DDC2B Address Register SCL After power on or reset the DDC interface it is in DDC1 state The shift register shilfts out data to SDA pin on the rising edge of VSYNC clock Data format is an 8 bit byte followed by a null bit Most significant bit MSB is transmitted first Every time when the ninth bit has been transmitted the shift register will load a data b
18. 670 MAIN BOARD 240124 1 4W T 5 120Kohm CARBON 1 8W T 5 39Kohm 1 CARBON 1 8W T 5 4 7Kohm 74 CARBON 1 8W T 5 100Kohm 7 7 7 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 674 CARBON 1 8W T 5 47Kohm CARBON 1 8W T 678 MAIN BOARD 040153 1 8W T 5 5 5 15Kohm 5 CARBON 1 8W T 5 4 7 CARBON 1 8W T 5 33Kohm CARBON 1 8W T 5 1Kohm CARBON 1 8W T 5 3 9Kohm CARBON 1 8W T 5 33Kohm CARBON 1 4W T 5 24Kohm CARBON 1 8 5 220Kohm MAIN BOARD FA040104 1 8W T 5 100Kohm CARBON 1 8W T 5 10Kohm 85 MAIN BOARD FA040103 CARBON 1 8W T 5 10Kohm 1 MAIN BOARD FB241301 1 4W T 1 1 3Kohm MAIN BOARD FB242801 1 4W T 1 2 8Kohm MAIN BOARD FB242871 1 4W T 1 2 87Kohm MAIN BOARD FA330913 CARBON 1 2W T 595 91Kohm 5 MAIN BOARD FA240243 CARBON 1 4W T 5 24Kohm MAIN BOARD FB910010 1 4W T 5 1 MAIN BOARD FB241132 MAIN BOARD 040104 CARBON 1 8W T 5 100Kohm 698 MAIN BOARD 040224 CARBON 1 8W T 5 220Kohm MAIN BOARD 040102 CARBON 1 8W T 5 1Kohm 72 121 gt 2 o CO o I Seol 2 MAIN BOARD FA040153 CARBON 1 8W T 5 15Kohm MAIN BOARD FA040684 CARBON 1 8W T 5 680Kohm MAIN BOARD
19. Ni 30 0 7 3 WPP HYLSY 8 3 HNH SPP LMI281 8 431 1201 nsn n G A0J DSD R R ADJ REB CUTOFF E CLANP 20 cm un 0204 184148 e nul CLAMP R CL AMP 10 0 CONTRAST HAE E CLAMP PCI UIN REvISIDHS DESCRIPTION R244 SOL SCL N S YNC e CON R LDN G mH BCL1 5DLT Tg IS OMITTED UNLESS DTHERWISE MOTEC UNIT OF RESISTAMCE 15 ONTTIED MPACITAMEE RATTI approval NPG DISPLAY roc WINE BY N9501 N9701 MS50 N9704 4700P FRY CHECK UP73 N97057AS75F MSTSF ZRDSI7IH VIDEO SCH OUCUMENT SIZE REV 1 5 1 1 DIRECTOR BY esas 99 2 Main Board F prie S
20. 0 501 0 524 24 Distortion Adjustment Factory Mode Setting After completion of adjustment exit the factory mode and data will be saved Signal All signals Cross hatch Perform the adjust for signal 14 in step 6 1 3 Perform the adjust for above all signal in step 6 4 5 1 Picture Tilt Adjustment 1 Receive signal 14 Cross hatch 2 When OSM MENU is displayed Select the icon 3 Make sure that the picture tilt meets the following standards X lt 1 0mm X 2 Pincushion Balance Adjustment 1 When OSM MENU is displayed Select the icon 2 Make sure that the Pincushion Balance meets the following standards A B lt 0 5mm AB 3 Parallelogram distortion Adjustment 1 When OSM MENU is displayed Select the 27 2 Adjust SW so that the vertical line and horizontal line at the screen s center fall at right angles less than 90 0 5 degree 25 4 Side Pincushion Adjustment 1 When OSM MENU is displayed Select the icon 2 Make sure that the side pincushion distortion meets the following standards 5 Trapezoid Distortion Adjustment 1 When OSM MENU is displayed Select the N icon 2 Make sure that the trapezoid distortion meets the following standards AB CD lt 2mm AC BD lt 2mm A B 6 Preset Picture Size and Position Adjustment Factory Mode Setting Signal All Signals Cross hatch Perform the
21. 33 K BLUE VIDEO IN t ANN Vcc gt 100k VIDEO 5 POTS 100K 1 12 0 POT6 100 OSD 0 1 1 10 11 12 13 14 12V 100 LM1281 TOP VIEW L1 is a Ferrite Bead 27 26 25 24 21 20 19 18 17 16 15 R21 47k gt POT3 RED DRIVE ADJ 7 100K gt POTI GREEN DRIVE ADJ x7 100K 28 o c21 2 BLUE DRIVE ADJ 2 2 01 lt gt 100 T 020 OduF p POT4 CUTOFF ADJ lt gt 100K T C19 2 T 3 O 1uF L1 R19 01 wv RED VIDEO z R20 430 _ lt 2 4k 3 615 016 0 1uF 1004F R18 Zz ww GREEN VIDEO OUT 2 17 430 x 2 4k l 014 57 R15 oe gt BLUE VIDEO OUT C13 57 01 R17 2 T BLANK GATE R17 M 100 CLAMP GATE T 50Q Termination to be Used at Outputs TL H 12355 12 FIGURE 2 LM1281 OSD Video Preamp Demonstration Board Schematic 66 10 Monolithic triple 13 5nS driver August 1999 AV rational Semiconductor LM2438 Monolithic Triple 13 5 ns CRT Driver General Description Features The LM2438 is an integrated high voltage CRT driver circuit m Well matched with LM1279 video preamp designed for use in color monitor applica
22. LUMA VSSA ARWDB y RCAD CHARACTER ROM 1 HDBEN ADDRESS BUS ADMINISTRATOR LUMINANCE amp BORDGER GENERATOR VFLB VERTICAL RLPN gt WINDOWS amp vep piSpLAy 4 venta CONTROL 4 0 CONTROL HFLB HORIZONTAL ROUT 5 gt DISPLAY CONTROL GOUT p Q a CCS1 COLOR 5 ROUT PHASE LOCK Loop BUE ENCODER FBKG 71 1 0 CONNECTION DIAGRAM 16 PINS PDIP 300 MIL PACKAGE VSSA 1 16 VSS VCO 2 15 ROUT RP 3 14 GOUT VDDA 4 13 BOUT MTV016 N HFLB 5 12 FBKG SSB 6 11 HTONE SDA 7 10 VFLB SCK 8 9 VDD 2 0 PIN DESCRIPTIONS Name Function VSSA 1 Analog ground This ground pin is used to internal analog circuitry VCO 2 Voltaqe Control Oscillator This pin is used to control the internal oscillator frequency by DC voltage input from external low pass filter RP 3 Bias Resistor The bias resistor is used to regulate the appropriate bias current for internal oscillator to resonate at specific dot frequency VDDA I 4 Analog power supply Positive 5 V DC supply for internal analog circuitry Anda 0 1uF decoupling capacitor should be connected across to
23. MAIN BOARD R0319110 JJUMPER WIRE 5mm MAIN BOARD HC006002 BEAD 3 5X4 7 T MAIN BOARD GB8103F5 CERAMIC Z5U E T 0 01u 500V MAIN BOARD GB8103F5 CERAMIC 25 0 01u 500V M C107 MAIN BOARD GA347625 ELECT 850C T 47u 16V M C108 76 MAIN BOARD GA322645 ELECT 850C T 22u 35V C109 MAIN BOARD GB747153 CERAMIC 5 470P 50V K 214 MAIN BOARD GE210352 PLASTIC PEI T 0 01u 50V J 8 222 MAIN BOARD GAH22675 ELECT 1050C T 22u 100V M TK 230 MAIN BOARD GF210462 MEF CAP BOX 0 1u 63V J 238 MAIN BOARD GA347625 ELECT 850C T 47u 16V M ELECT 850C T 100016 5 MAIN BOARD GA310655 ELECT 85oC T 10u 50V M ELECT 850C T 100u 16V 5 3 B MAIN BOARD GF210452 MEF CAP BOX 0 1u 50V J MAIN BOARD GA347655 ELECT 850C T 47u 50V M 7 7 272 273 274 275 276 277 279 280 281 282 283 287 292 293 294 297 298 m nm 300 301 304 308 311 MAIN BOARD MAIN BOARD GF MAIN BOARD GF MAIN BOARD MAIN BOARD MAIN BOARD MAIN BOARD MAIN BOARD MAIN BOARD MAIN BOARD MAIN BOARD GF MAIN BOARD MAIN BOARD MAIN BOARD MAIN BOARD MAIN BOARD MAIN BOARD MAIN BOARD MAIN BOARD MAIN BOARD MAIN BOARD MAIN BOARD MAIN BOARD MAIN BOARD MAIN BOARD MAIN BOARD GE MAIN BOARD MAIN
24. REVOLVING STAND assy 17000291 FOR BASE REVOLVING STAND ASSY 17000451 REVOLVING STAND ASSY 11000361 REVOLVING 94 REVOLVING STAND ASSY 11000251 REVOLVING REVOLVING STAND ASSY 11000261 REVOLVINGSTAND T 94HB REVOLVING STAND ASSY 11000362 REVOLVINGSTAND B 94HB REVOLVING STAND ASSY 11000262 REVOLVINGSTAND T 94HB ET ASSY 80009271 SIGNAL CABLE 20276 1 5M FOR N9701 s um s s ES ss ET ASSY 0004471 Es 1 77 Ei ss ASSY 0011201 DEGUESSING COIL ET ASSY 14000011 SCREW 2CBRITS 4 16 15BF ET ASSY 14000071 ET ASSY 14300031 ET ASSY 14000031 ASSY 17000371 ASSY 14600011 SCREW SPECIAL 5 25 ET ASSY 17000111 ET ASSY 17000261 ASSY 18000281 ASSY 18000371 ASSY 11700221 FOR FRON ET ASSY 14000021 ET ASSY 18000271 SUPPROT PS 26GD ET ASSY 80000031 ET ASSY 0000891 WIRE L 360mm BLACK AWG18 GND WIRE ET ASSY 0001931 17 ROTATION COIL GND WIRE ET ASSY 0010951 MS75 CRT GND WIRE GND WIRE 1 ET ASSY 72000641 ET ASSY 0005101 ET ASSY R0191207 TAPE BLACK L 75mmX3 ET ASSY 80011271 ET ASSY 17000321 CABLE TIES GT 100M ET ASSY 10100731 CABINET FRONT ASSY PC ABS ET ASSY 10100924 CABINET BACK 96 d
25. 00 00 FC 00 4E eo 45 43 20 56 37 32 30 oa 20 20 20 20 oo 00 FF zo oo so ao on fca Serial No Area 9bytes Check Sum MultiSync V721 EDID Serial No Format Week of Manufacture Month 4 Year of Manufacture Te Ts TA T Te To Te Tr 00 FF FF FF 00 Bc O1 Ot ot o1 01 78 18 a1 55 4A 99 26 20 11 00 31 so 45 so 61 59 71 dA 81 40 30 01 ot 0t 01 01 Ea 24 00 60 41 00 28 30 60 40 13 10 00 00 1E 00 00 00 Fo 00 37 76118 50 46 20 20 20 20 00 00 FC ed ee ee 70 oo 5e o 31 59 o oo 2 Serial No Area 9bytes Check Sum Diamand Scan 71 EDID Serial No Format Week of Manufacture Month 4 Year of Manufacture o 23 5 6 7 8 9 00 oom FRI F FF FF FF 00 34 ac 40 45 o1 01 o1 01 78 ea 21 18 A1 55 4 99 26 4C EE 31 59 45 59 61 59 71 4A 81 40 24 00 60 41 00 30 30 60 40 13 00 36 EB 10 00 00 00 0
26. 13 MACII 49k 49 7KHz 74Hz i 14__ 800 600 85 53 6KHz 85Hz i 15 11024 768 70 56 4KHz 70Hz i 16 1024 768 75 60 0KHz 75Hz P 17 1640 480 120 63 7KHz 120Hz 18 1280 1024 60 64 0KHz 60Hz 19 800 600 100 64 0KHz 100Hz ai 20 1024 768 85 68 6KHz 85Hz indicate not care 2 User mode 4 modes FIFO replacement is applied 45 Pin Definition Pin Description 1 DA2 Pin balance PWM 2 DA1 H Position PWM 3 DA0 H size PWM 4 Reset Low reset Vdd 5V 6 Vss Ground 7 8MHz Crystal out 8 Osc Crystal in 9 5 EEPROM OSD SDA 10 PB4 EEPROM OSD SCL 11 Test Pattern 12 2 CS1 13 1 50 14 15 IRQ CS2 16 7 MUTE2 17 6 Degauss out 18 5 MUTE1 19 PC4 PMU suspend 20 Burn in ID 46 GENERAL DESCRIPTION The WT6016 is a member of WT60XX microcontroller family It is specially designed for digital trolled multi sync monitor It contains 8 bit CPU 16K bytes ROM 288 bytes RAM 14 PWMs parallel 1 O SYNC processor timer one DDC interface slave mode interface with DDC1 one master slave interface two 4 bit A D converters and watch dog timer FEATURES 8 bit 6502 compatible CPU 4MHz operating frequency 16384 bytes ROM 288 bytes SRAM 8MHz crystal osc
27. BOARD 040562 CARBON 1 8W T 5 5 6Kohm 3 MAIN BOARD 040104 CARBON 1 8W T 5 100Kohm FA330159 1 2W T 5 1 5 156 R0319110 JUMPER WIRE 10mm R157 84 MAIN BOARD 635 MAIN BOARD MAIN BOARD 240470 METAL 1 4W T 1 47 MAIN BOARD 040105 1 8W T 5 1 638 BOARD 040202 1 8W T 5 2 R160 1 MAIN BOARD 040104 CARBON 1 8W T 5 100Kohm R168 MAIN BOARD FB910010 METAL 1 4W T 5 1ohm s mc E i pr i 657 MAINBOARD Al 240105 CARBON 1 4W T 5 1Mohm ROH 1 LS 658 MAINBOARD AN Ro319110 JUMPER WIRE AT 10mm ROH Jif LS G60 MAINBOARD R031910 JUMPER WIRE 10mm 1 CARBON 1 8W T 5 10Kohm Ha 662 MAIN BOARD FB910010 METAL 1 4W T 5 10hm x 7 p 1 p oo i p 3 p po E E 1 63 MAIN BOARD FB910010 METAL 1 4W T 5 1ohm 64 MAIN BOARD 040105 CARBON 1 8W T 5 1Mohm 65 MAIN BOARD FA040395 CARBON 1 8W T 67 MAIN BOARD A l FA040103 CARBON 1 8W T 5 10Kohm 68 MAIN BOARD FA040823 CARBON 1 8W T 5 82Kohm CARBON 1 8W T 5 1 2Kohm 663 664 665 666 BOARD FA040475 CARBON 1 8W T 5 4 7Mohm 667 668 669
28. MultiSync V721 Different List B Asia R Australia L LG T Toshiba S Samsung ASSY CODE PART NO DESCRIPTION REMARK CABINET FRONT ASSY 10101111 2 CABINET FRONT ASSY 11300351 PUSH BUTTON CONTROL 4 CABINET FRONT Assy 111600181 S CABINET FRONT ASSY_ 13000061 G PACKING assy 80002931 0001651 S PACKING assy 19400491 PACKING assy 19400501 11300781 PUSHBUTTON SW 1 10 PACKING ASSY 13700021 POLYETHYLENE 270 370 MjPACKINGASSY 113700031 840 POLYETHYLENE 150 370 12 assy 18700071 PE 500 480 850 WARNING 8 55 18700091 POLYETHYLENE 00 Packing assy 18201121 721 8 1 T5 PACKINGASSY 15500701 OWNERSMANUALVZZUVOZNR T6 PACKINGASSY 18201221 CARTONBOXV7218 p S px i 17 assy 15500771 18 PACKING ASSY 19700041 INSTRUCTION CD ROM V521 V721 V921 19 PACKING assy 15900051 20 PACKINGASSY 15700043 210 ASSY 15200241 22 11000391 23 ASSY 11000381 e4 PACKING ASSY __ 11000382 REVOLVING STAND ASSY 17000291 27 REVOLVING STAND ASSY 11000251 11000261 11000262 11000361 11000362 REVOLVING STAND 0009271 SET ASSY 0005581 CRT
29. 25 42 21 16 22 22 22 81 72 176 Front dot uS 0 67 0 18 525 525 625 408 5 m 350 400 480 480 600 384 11 122 12 711 15 253 13 714 17 067 10 810 1 907 1 112 1 049 1 114 0 626 0 563 POS NEG NEG POS NEG NEG NEG NEG POS POS POS POS C S j Composite vie s y 21 oe 640 480 EVGA400 800 600 640 480 8001600 10 7 60 75 VESA 60 85 75 VESA 3750 MHz 37 50 Hz mS Sync Pulse H H mS NON RETE TER E 22 49 7 1087 70 107 75 VESA 800 600 8 640 480 120 5 6407480 78 750 2 dot uS Disp dot uS uS Sync Pulse dot uS dot uS Back mS Sync Pulse H H mS Total dot 1152 1048 1328 1312 uS 20 11 18 63 17 71 16 66 S WE ED oN 7 9 ON E pl OFF OFF OFF 23 55 00 63 66 15 71 11 645 0 566 12 10 60 VESA 1280 1024 108 000 63 98 Polarity HIV POS POS POS POS NEG NEG POS POS 800 600 1024 768 D essc S a j es 9 6355 E Total t 1056 1376 L dot 1024 uS 11 852 10 836 Front dot 48 uS 0 593 0 508 dot ot 1 185 1 016 S S
30. 5 150ohm 9 METAL 1 4W T 1 75ohm FA040330 CARBON 1 8W T 5 33ohm CARBON 1 8W T 5 3900hm CARBON 1 8W T 5 33Kohm CARBON 1 8W T 5 220Kohm FA040330 1 8W T 5 CRT BOARD 040101 1 8W T 5 100 252 BOARD 040333 1 8W T 5 33Kohm 259 1 CRT BOARD 040391 1 8W T 5 390ohm CRT BOARD 240151 CARBON 1 4W T 5 150ohm R260 CARBON 1 8W T 5 220Kohm CRT BOARD FA240223 CARBON 1 4W T 5 22Kohm 75 BOARD CRT BOARD CRT BOARD FA330101 1 2W T 5 1000hm FA040103 CARBON 1 8W T 5 10 R288 FA040112 CARBON 1 8W T 595 1 1Kohm FA240334 CARBON 1 4W T 5 330Kohm BOARD BOARD BOARD BOARD BOARD FA040102 FA240223 FA040472 CARBON 1 8W T 5 4 7Kohm FA240101 CRT BOARD FA040103_ CARBON 1 8W T 5 10Kohm E s FA040562 CARBON 1 8W T 5 5 6Kohm s 169 BOARD 040562 CARBON 1 8W T 5 5 6Kohm R295 1 170 CRT BOARD FA040105 CRT BOARD 040473 CRT BOARD FA040473 CRT BOARD 72000281 9501 CRT BOARD 29D NECK Sai CRT BOARD INSERT GB9332H8 CERAMIC Z5V F T 3300P 1KV Z CRT BOARD INSERT _ GAB22675 CRT BOARD INSERT Ro224070
31. BOX 0 001u 63V J 247262 MEF CAP BOX 0 0047u 63V J 222452 MEF CAP BOX 0 22u 50V J EN 210462 MEF CAP BOX 0 1u 63V J 222352 PLASTIC PEI T 0 022u 50V J 78 8 226 5 2446740 Jij 319 MAIN BOARD GA310655 ELECT 85oC T 10u 50V M C433 1 S20 MAINBOARD GA310655 ELECT 0uSOVM 05 _ 1 321 MAIN BOARD A GA310655 ELECT 850C T 1owsovm_ 1 S22 MAIN BOARD A GA310655 ELECT 8 1owsovM_ 048 1 323 ELECT 850 1u 50V M 324 MAINBOARD Al 0 247252 PLASTIC 0 0047u 50v3 1 325 MAIN BOARD GA347555 646 1 326 MAINBOARD A GA347455 ELECT8SoC TO4AzuSOVM 1 327 MAIN BOARD GF210462 MEF CAP BOX 0 1u 63V J 328 MAINBOARD A GF210452 BOX o 1w5ov3 7 048 S29MAINBOARD AN GA347555 8500 7 47050 40 1 _330 MAIN BOARD AI GE268252 PLASTIC PENT 0 006800 11 S91 MAINBOARD AI GE210352 PLASTIC o 01w 50v3 7 ces 1 332 MAINBOARD AI GA310655 ELECT 850C T 1owsovM 64 1 333 MAINBOARD GB710253 Y5P B T 1000 50 695 S94 MAINBOARD AI GA310555 50 11 335 MAIN BOARD GB210458 CERAMIC Y5V T 0 1u 50V 2 336 MAINBOARD A
32. Height 7 O 8svcap OS vare v REF x Tl os Focus V Dyn Focus Cntl Wa E aie 5 H Width E W Pin gt 10 4v 7 14 A Rm R p O ow H Bow R R Cntl LM1295 Application R1 10KQ TO V Deflection U1 21 22 Output Amp LM1295 Rvet 54 S Center Adj Gnd VDrive OSD Vref Negative going V Sync 12V Focus V Dyn Height Focus 59 V Height Pin 2 The amplitudes of the V and V drive currents are controlled by means of the OV to voltage of this pin The current can be raised by raising by raising the voltage The control range is approximately 1 8 to 1 4V CAP Pin 9 4 V CAP capacitor 10 uF capacitor V Sync in The vertical synchronization input is a negative TTL level pulse and it has the function of locking the vertical oscillator The pulse has a minimum width of approximately 200 nS 8V CAP Pin 5 8V CAP capacitor 100uF capacitor V Dyn Height Pin 6 The amplitude of the driving currents of the voltages V and V are controlled by means of the 3V to 4V voltage of this pin H Dyn Height Pin 9 This output is expressed by the sum of the vertical ramp and the parabola resulting from that ramp The amplitude and the polarity of the ramp signal is controlled by H TRAP CNTRL Pin 11 and the a
33. John Wiley amp Sons New York 1976 Video Amplifier Design for Computer Monitors National Semiconductor Application Note 1013 Pease Robert A Troubleshooting Analog Circuits Butterworth Heinemann 1991 Because of its high small signal bandwidth the part may os cillate in a monitor if feedback occurs around the video chan nel through the chassis wiring To prevent this leads to the video amplifier input circuit should be shielded and input cir cuit wiring should be spaced as far as possible from output circuit wiring Application Hints continued NSC DEMONSTRATION BOARD Figure 12 shows the routing and component placement on the NSC LM1279 2438 demonstration board The schematic of the board is shown in Figure 11 This board provides a good example of a layout that can be used as a guide for fu ture layouts Note the location of the following components C54 C56 Voc bypass capacitor located very close to pin 4 and ground pins C43 C44 Ves bypass capacitors located close to pin 8 and ground C53 C55 Additional Voc bypass capacitors near LM2438 and Voc clamp diodes Very important for arc protection The routing of the LM2438 outputs to the CRT is very critical to achieving optimum performance Figure 73 shows the routing and component placement from pin 1 of the LM2438 to the red cathode Note that the components are placed so that they almost line up from the output pin of the LM2438 to the red c
34. O P VOLTAGE SET AT 17V CURRENT SET AT 200MA POSITIVE CONNECT TO C112 NEGATIVE CONNECT TO C105 wee EM 2 SCOPE SET AT 10V DIV 10US DIV PROBE CHECK CONNECT TO Q101 GATE AND 105 e U101 PIN 7 VCC a p PIN 4 SAWTOOTH 4 PIN 8 5V POWER SW FAILURE TURN ON R111 20101 33 3 VIDEO NOISE UNSYNCHRONOUS CHECK Q101 G S FREQUENCY YES CHECK C114 R116 D109 R115 R117 4 SYNCRONZE p NO witHH sync_ CHECK HORIZONTAL FREQUENCY C114 TO GND YES X CHECK CHECK C132 R139 D115 R138 R140 SYNCRONZE NO wrHH sync CHECK HORIZONTAL FREQUENCY C132 TO GND NORMAL OPERATION 34 4 VIDEO 5 lt SCREEN CONTROL gt NO CLOCKWISE YES lt 1201 5 8 11 gt NO RASTER ON PAGE SIGNAL LEVEL lt YES CHECK TROUBLE IN R G B SIGNAL SIGNAL CABLE lt 0201 PIN 18 20 23 gt NO SIGNAL LEVEL lt YES 7 CHECK PROBLEM IN U201 CLAMP PIN 15 U201 12V VOLTAGE lt U203PIN1 3 5 gt NO SIGNAL LEVEL YES CHECK PROBLEM IN U203 12V 77V VOLTAGE aC CATHODE VIDEO UR NO YES PROBLEM IN CRT 35 PROBLEM IN R220 R240 R260 5
35. Preset Picture Size and Position Adjustment for above all signal 1 When OSM MENU is displayed Select the 0 22 icon 2 Adjust the picture size and position as listed below by SW Picture size 310 2mm ATP Bezel V 232 2mm p Video XLeft XRight Picture position H lt 3 lt 3mm xBottom 26 Purity 1 Receive signal 14 Cross hatch pattern 2 The CRT face should be facing east and degauss the entire unit by external degaussing coil 3 Make sure the single color purity If not readjust CPC magnet and touch up using correction magnets Convergence C Convergence error of horizontal direction C Convergence error of vertical direction C Total direction of Convergence error Calculate by VC 2 2 Calculate w Cy 1 Receive signal 14 Cross hatch pattern 2 Measure convergence error If it is out of spec adjust static convergence by 4 pole magnets and 6 pole magnets 232mm 310mm A Zone A circle 232 mm in the center of the CRT face center Within 0 35 Gs No rule B Zone Areas outside of zone A within the rectangle of 310 mmx232 mm Safety with the list below Cy lt 0 35 mm 0 35 mm lt Cr lt 0 40 mm Cy lt 0 35 mm OK Calculate Cs and judge Within 0 50 mm 0 35 mm lt Cy lt 0 40 mm Calculate Cs and
36. RASTER NO RASTER ves CHECK NO YES CHECK NO 301 PIN 3 U402 PIN4 HVSYNC 5 CHECK gt NO U301 PIN 7 U402 PIN 23 24 gt HNSYNC YES y s CHECK T301 PIN 3 VOLTAGE 56V 68V AT H FREQ lt 31 5KHz YES Y aN CHECK Q307 NO POWER SUPPLY CHECK PROBLEM IN MCU U701 PROBLEM IN 0301 0402 U102 Q102 D114 D111 L102 OR DEFLECTION YOKE COLLECTOR ABOUT 7 1050Vppp 7 ES ES we CHECK GI NO NO PROBLEM IN Q307 Q308 T302 D307 D308 Q309 Q325 VOLTAGE ABOUT gt 46 66 ES T YES PROBLEM IN G2 VOLTAGE 36 Y PROBLEM IN Q305 Q306 ZD303 D318 T301 C344 6 TROUBLE IN H V PROBLEM IN HOR OR VER SYNC YES CHECK x lt CONNECTOR 8702 NO 7 PIN3 4 SIGNAL lt YES U701 PIN 40 39 gt NO PROBLEM IN SIGNAL CABLE SYNC SIGNAL lt Y YES U701 PIN 32 33 SYNC YES U301 PIN3 U402 PIN4 7 YES did p PROBLEM IN SYNC LINE amp Q301 Q401 U701 PIN 5 VOLTAGE Y YES U701 PIN 8 YES PROBLEM IN U301 U402 PROBLEM
37. T 1N4148 CRT BOARD 80000451 DIODE T 1 2W 15583 71 CRT BOARD 80000051 DIODE T 1 2w 15582 CRT BOARD 0001211 DIODE T 1 2W 21 PHILIPS CRT BOARD 0004711 DIODE 155244 CRT BOARD 0000451 DIODE T 1 2W 15583 CRT BOARD 0000051 DiODE T 1 2w 15582 CRT BOARD 0001211 DIODE T 1 2W 21 PHILIPS CRT BOARD 0004711 DIODE 199244 CRT BOARD 0000451 DIODE T 1 2W 15583 CRT BOARD 80000051 DIODE T 1 2w 15582 CRT BOARD 0001211 DIODE T 1 2W BAV21 PHILIPS CRT BOARD 0004711 DIODE 155244 CRT BOARD 044148 DIODE T 1N4148 CRT BOARD 044148 DIODE T 1N4148 CRT BOARD 0000451 DIODE T 1 2W 15583 CRT BOARD 0000051 DiODE T 1 2w 15582 CRT BOARD 0001211 DIODE T 1 2W 21 PHILIPS CRT BOARD 80004711 DIODE 155244 CRT BOARD 0000451 DIODE T 1 2W 15583 CRT BOARD 0000051 DIODE T 1 2W 15582 CRT BOARD 0001211 DIODE T 1 2W 21 PHILIPS CRT BOARD 004711 ROHM DIODE 155244 CRT BOARD 0000451 DIODE T 1 2W 15583 CRT BOARD 0000051 DIODE T 1 2w 15582 CRT BOARD 0001211 DIODE T 1 2W 21 PHILIPS CRT BOARD 80004711 DIODE 155244 CRT BOARD R0319110 JUMPER WIRE 7 5mm CRT BOARD R0319110 JUMPER WIRE 12 5mm CRT BOARD R0319110 JUMPER WIRE 7 5mm CRT BOARD All R0319110 JUMPER WIRE 10mm CRT BOARD R0319110 JUMPER WIRE
38. VDDA and VSSA HFLB 5 Horizontal input This pin is used to input the horizontal synchronizing signal It has an internal 100 pull up resistor 55 6 Serial interface enable It is used to enable the serial data interface and is also used to select 2 or SPI bus operation If this pin is left floating 2 bus is enable Otherwise the SPI bus is enabled SDA 7 data input The external data transfer through this pin to internal display registers and control registers It has an internal 100 pull up resistor SCK 8 Serial clock input The clock input pin is used to synchronize the data transfer It has an internal 100 pull up resistor VDD 9 Digital power supply Positive 5 V DC supply for internal digital circuitry and a 0 1uF decoupling capacitor should be connected across to VDD and VSS VFLB 10 Vertical input This pin is used to input the vertical synchronizing signal It has an internal pull up resistor HTONE O 11 Half tone output This pin is used to attenuate the external R B amplifiers gain for the transparent windowing effect FBKG O 12 Fast Blanking output It is used to cut off the external R G B signals while this chip is displaying characters or windows BOUT O 13 color output It is blue color video signal output GOUT 14 Green color output It is a green color video signal output ROUT 15 Red color output It is red color video signal output VSS
39. also help minimize rise and fall times as well as minimize EMI For proper arc protection it is important to not omit any of the components shown in Figure 9 www national com Application Hints continued R2 1 28 CATHODE 100 SPARK 05101043 10 FIGURE 9 One Channel of the LM2438 with the Recommended Application Circuit OPTIMIZING TRANSIENT RESPONSE Referring to Figure 9 there are three components 1 R2 and L1 that can be adjusted to optimize the transient re sponse of the application circuit Increasing the values of R1 and R2 will slow the circuit down while decreasing over shoot Increasing the value of L1 will speed up the circuit as well as increase overshoot It is very important to use induc tors with very high self resonant frequencies preferably above 300 MHz Ferrite core inductors from J W Miller Mag netics part 78F1R8K were used for optimizing the perfor mance of the device in the NSC application board The val ues shown in Figure 9 be used as a good starting point for the evaluation of the LM2438 Using a variable resistor tor R1 will simplify finding the value needed for optimum per formance in a given application Once the optimum value is determined the variable resistor can be replaced with a fixed value EFFECT OF LOAD CAPACITANCE Figure 8 shows the effect of increased load capacitance on the speed of the device This demonstrates the importance of knowing the load c
40. judge Need to touch up Within 0 50 mm 27 Write and Inspection for Plug and Play Communication 1 Construction of System This system should be connected as shown below Program Disk Signal Cable Fixture Power Cable Note PC clock speed should be below 266 2 OS is PC DOS Fixture Board can be connected directly to PC without Printer Cable 2 EDID Write and Inspection Method 1 Run specified EDID write and Inspection program on PC DOS mode The monitor turns into the self test mode 2 Run the specified EDID write and inspection program under PC DOS mode 3 Key in the serial No or Scan serial No bar code 4 Press Return key to write the EDID data 5 Press F1 key to inspect DDC1 communication 6 Press F2 key to inspect DDC2 communication EDID DATA Format Please refer the 3 EDID data File 28 3 EDID DATA FILE MultiSync V720 EDID Serial No Format Week of Month 4 Year of Manufacture Jope s e a e e e E ot ot o2 21 18 76 ea 21 18 A1 55 4A 99 26 20 n ac FF EE si 59 45 so e 59 vt 4a 81 40 30 2A 98 51 40 30 70 40 13 36 10 00 00 00 00 FD 00 37 78 fF 50 46 00 oA 20 20 20 20 20 00
41. keyboard is not touched for a given period of time that a preset in advance the CPU outputs the LOW level signal to the transistor Q107 then Q105 turns OFF the transistor Q108 and Q104 turns OFF As a result the power is shut out at that state 3 When the user touches the keyboard in the OFF mode the operation is resumed the video signals V SYNC and H SYNC turn ON the CPU via resistor R129 and R159 then the transistor Q105 and Q107 turn ON the transistors Q104 and Q108 turn ON As a result the operation returns to the ON state DC DC The DC DC voltage is DC 45 volts and since the set up voltage is variable from 62 volts to 160 volts it is variable depending on the horizontal synchronism The frequency band is variable from 31 kHz to 69 kHz The voltage is fed back from the fly back transformer FBT The DC DC output voltage is used as high voltage input of FBT T301 1 DC DC is a step up circuit and consists mainly of the choke L106 the transistor Q102 the diode D114 and U102 2 When the PWM controls U102 IC KA3843 a driving pulse is generated at the gate of the transistor Q102 and the transistor Q102 turns ON During the ON cycle the energy is stored in the choke L106 The transistor Q102 turns OFF when the driving pulse disappears from the gate of the tran sistor Q102 As a result the voltage at the dot terminal of the winding flows in the positive direction and goes to the fly back rectifier The energy stored in the choke L
42. nil j 77 83 583 MAIN BOARD EAA09456 TR NPN 2SC945P TO 92 T N P S 584 MAIN BOARD 10157 PNP 2SA1015GR 92 1 T P S 585 MAIN BOARD EBA07336 TR PNP 2SA733P TO 92 T N P S Q604 OR 586 MAIN BOARD EAA18157 587 MAIN BOARD EAA09456 88 MAIN BOARD EAA18157 89 MAIN BOARD EAA09456 90 MAIN BOARD EAA18157 591 BOARD 09456 592 MAIN BOARD FA330684 CARBON 1 2W T 5 680Kohm 593 MAIN BOARD FA040331 CARBON 1 8W T 5 330ohm 594 MAIN BOARD FA240330 CARBON 1 4W T 5 33 ohm MAIN BOARD MAIN BOARD 597 MAIN BOARD 598 MAIN BOARD MAIN BOARD 600 MAIN BOARD MAIN BOARD FA040752 CARBON 1 8W T 5 7 5Kohm MAIN BOARD FA330104 CARBON 1 2W T 5 100Kohm FA240564 CARBON 1 4W T 5 560Kohm FA240334 CARBON 1 4W T 5 330Kohm FA040470 CARBON 1 8W T 5 47ohm FA240113 CARBON 1 4W T 5 11 FA040472 CARBON 1 8W T FA040102 CARBON 1 8W T 5 1Kohm 4 7Kohm MAIN BOARD FA040390 1 8W T 595 39ohm 604 MAIN BOARD 605 MAIN BOARD FA240271 CARBON 1 4W T 5 270ohm FA240390 CARBON 1 4W T 1 39ohm 606 MAIN BOARD FA240203 CARBON 1 4W T 5 20Kohm MAIN BOARD FA040472 CARBON 1 8W T 5 4 7Kohm 608 BOARD FA330104 CARBON 1 2W T 5 100Kohm E EE as 2 521 s
43. on the LM2438 This fast high voltage high energy pulse can dam age the LM2438 output stage The application circuit shown in Figure 9 is designed to help clamp the voltage at the out put of the LM2438 to a safe level The clamp diodes D1 and D2 should have a fast transient response high peak current rating low series impedance and low shunt capacitance FDH400 or equivalent diodes are recommended Do not use 1 4148 diodes for the clamp diodes D1 and D2 should have Short low impedance connections to Vcc and ground re spectively The cathode of D1 should be located very close to a separately decoupled bypass capacitor C3 in Figure 9 The ground connection of D2 and the decoupling capacitor should be very close to the LM2438 ground This will signifi cantly reduce the high frequency voltage transients that the LM2438 would be subjected to during an arcover condition Resistor R2 limits the arcover current that is seen by the di odes while R1 limits the current into the LM2438 as well as the voltage stress at the outputs of the device R2 should be V2W solid carbon type resistor R1 can be a metal or carbon film type resistor Having large value resistors for R1 and R2 would be desirable but this has the effect of increas ing rise and fall times Inductor L1 is critical to reduce the ini tial high frequency voltage levels that the LM2438 would be subjected to The inductor will not only help protect the de vice but it will
44. the information needed to determine the heat sink requirement for his appli cation The designer should note that if the load capacitance is increased the AC component of the total power dissipation will also increase The LM2438 case temperature must be maintained below 100 C If the maximum expected ambient temperature is 70 C and the maximum power dissipation is 2 6W from Fig ure 6 30 MHz bandwidth then a maximum heat sink thermal resistance can be calculated 100 C 70 C TH 2 6W This example assumes a capacitive load of 8 pF and no re sistive load 11 5 C W TYPICAL APPLICATION A typical application of the LM2438 is shown in Figure 11 Used in conjunction with an LM1279 a complete video chan ne from monitor input to CRT cathode can be achieved Per formance is ideal for 1024 x 768 resolution displays with pixel clock frequencies up to 60 MHz Figure 11 is the sche matic for the NSC demonstration board that can be used to evaluate the LM1279 2438 combination in a monitor PC BOARD LAYOUT CONSIDERATIONS For optimum performance an adequate ground plane isola tion between channels good supply bypassing and minimiz ing unwanted feedback are necessary Also the length of the signal traces from the preamplifier to the LM2438 and from the LM2438 to the CRT cathode should be as short as pos Sible The following references are recommended Ott Henry W Noise Reduction Techniques in Electronic Systems
45. 0 00 oo 37 78 1F 50 46 OB 00 OA 20 20 20 20 20 00 00 00 FC 00 44 60 69 oF 6E 64 53 63 61 6E 37 31 00 00 FF zo 59 31 59 41 oA 20 90 Serial No Area 9bytes Check Sum 29 Bar Code Format code39 Diqit 1121314 9 10 1213114 15 16 17 18 Format z 5 6 7 8 5 5 5 5 5 091 Example 70 00 01 Y Assembly Code 1 space Serial No Set Assembly code depends on CRT and Destination Serial No Descriptions Y Manufactured Year Last digit ex 0 gt 2000 M Manufactured Month 1 9 X October Y Novenber Z December S Serial No 5digits 00001 onward restart when month is changed F Factory Code Y is NPG China Factory R Product Revision code start from E DiamondScan 71 from A EDID Code Input Procedure ex V720 B 1 Scan Bar code 18 digits NB70091T 0 00001 Skip 9 digits then find the Serial 0Y00001YE Year hex Code from Year digit 0 gt OAh Make Week hex Code from Month digit 11 4 44 gt 2Dh Change Serial No to ASCII code 30h 59h 30h 30h 30h 30h 31h 59h 45h 6 Apply Serial No Information to the default EDID cod
46. 0444 e 18 oa tede Reference Distortion AG USIMONT uy o tet ti ied hg Inspection of PnP communication and Writing EDID to EEPROM and inspection of PNP communication 2 u NY A 16 1 2 N0701 Adjustment Specifications Ver 1 1 2000 10 27 Adjustment amp Inspection Tools A Color Analyzer B Signal Generator CHAROMA 2135 C Multi Meter D Hi Voltage Probe E Convergence Meter F Demagnetizer G Power Meter H Automatic Alignment System 1 DDC write amp inspection system TIMING TABLE Factory Mode 20 MODES MODE RESOLUTION H SYNC 5 FREQ H POLARITY V POLARITY 1 VGA350 31 5KHz 70Hz 2 VGA400 31 5kHz 70Hz 3 VGA480 31 5KHz 60Hz 4 35K 35 0KHz 66Hz 5 800 600 56 35 2KHz 56Hz 6 8514A 35 5KHz 87Hz 7 640 480 75 37 5KHz 75Hz 8 400 37 8KHz 84Hz 9 800 600 60 37 8KHz 60Hz 10 640 480 43 3KHz 85Hz 11 800 600 75 46 8KHz 75Hz 12 1 1024 768 60 48 3KHz 60Hz 13 49 49 7KHz 74Hz 14 800 600 85 53 6KHz 85Hz 4 15 1024 768 70 56 4KHz 70 2 16 1024 768 75 60 0KHz 75Hz 17 640 480 120 63 7KHz 120Hz 18 1280 1024 60 64 0KHz 60Hz 19 800 600 100 64 0KHz 100Hz 20 1024 768 85 68 6KHz 85Hz 4 Definition for Norm
47. 048 4096 8192 16384 bits of serial electrically erasable and programmable read only memory EEPROM organized as 128 256 512 1024 2048 words of 8 bits each The device is optimized for use in many industrial and commercial applications where low power and low voltage operation are essential The AT24C01A 02 04 08 16 is available in space saving eight pin PDIP eight pin and fourteen pin SOIC packages and is accessed via a two wire serial interface The AT24C01A 02 04 08 16 is guaranteed for 100 000 erase wire cycles and 100 year data retention In addition the entire family is available in 5 0 V 4 5 V to 5 5 V 3 0 V 2 7 V to 5 5 V 2 5 V 2 5 V to 5 5 V and 2 0 V 1 8 V to 5 5 V versions Pin Configurations 14 PIN PDIP Pin Name Function NC Ag to Address Inputs Vcc SDA Serial Data WP SCL Serial Clock Input WP Write Protect NG NC No Connect SCL SDA NC 8 PIN PDIP Vcc Vcc WP WP SCL SCL SDA SDA 56 4 Horizontal deflection signal processing LM1290 1 Full automatic synchronization from 22 kHz to 90 kHz No component changeover nor external adjustment is required DC control H phase and duty cycle The resistance corresponds to the frequency programmable down to VCO X ray input invalid H drive invalid due to low when VCC lt 9 5V The H OUT transistor is protected as a result The capacitor protects the H output transistor during the change of the scanning mode by mean
48. 106 is entered in the FBT passing through the choke L106 the diode D114 and the capacitor C129 3 The feedback is detected by the FBT via diode D130 the capacitor C145 the resistor R145 the variable resistor VR102 and the fixed resistor R146 and is connected to the U102 2 pin This is loop is the regular type one 4 The frequency of the synchronization signal coming from video H SYNC is variable from 31 kHz to 69 kHz The circuit consists of the capacitor C132 the resistor R139 the diode D115 the resistor R138 and the resistor R140 5 The soft start circuit consists of the resistor R178 the capacitor C164 the diode D133 and the diode D117 42 2 MCU Monitor Specification Frequency Specification H freq 29 5K 70KHz V freq 43 160Hz Judge polarity only when frequency is 31 5 KHz and 37 8 2 Support composite sync detection System Architecture 1 MCU Weltrend WT6016 16K bytes ROM size 2 EEPROM 24C04 series 4K bit with ID code for identify initialization 3 OSD MTV016N 12 Input 1 Sync input 2 pins for H sync amp V sync frequency inverted input 2 Key input 2 pins for A D key input SELECT UP DOWN and RECALL 3 Burn in ID input 1 pins for Burn in ID input 4 Reset input low pulse for reset MCU 5 Crystal input 2 pins using 8MHz crystal Output MCU digital pin 1 Degauss Active high pulse for 2 5 sec when in degauss MCU will a
49. 110 JUMPER WIRE 17 5mm 427 MAINBOARD A 8031910 JUMPERWIRE AUT imm 428 MAINBOARD 0319110 JUMPER WIRE 10mm 429 MAINBOARD A 0319110 JUMPER WIRE 10mm 430 MAINBOARD Ro31910 JUMPER WIRE AIT 125mm _ W 481 MAINBOARD Ai Ro31910 JUMPER WIRE AIT 125mm 482 MAINBOARD AI 0319110 JUMPER WIRE AIT 125mm _ 488 MAINBOARD Ai 0319110 JUMPER WIRE 10mm 434 MAIN BOARD 0319110 JUMPER WIRE 12 5mm 495 MAINBOARD 0319110 JUMPER WIRE A T20mm 496 MAINBOARD 0319110 JUMPER WIRE AIT 15mm 487 MAINBOARD Ai 0319110 JUMPER WIRE AT 16mm 488 MAINBOARD A 0319110 JUMPER WIRE AT 15mm 489 MAINBOARD A 0319110 JUMPER WIRE AIT 17 5mm 440 MAINBOARD A Ro31910 JUMPER WIRE AIT 175mm 441 MAINBOARD AI Ro31910 JUMPER WIRE AIT 17 6mm _ W 442 MAIN BOARD 0319110 JUMPER WIRE 17 5mm 443 MAINBOARD 0319110 JUMPER WIRE AIT 7 5mm MAINBOARD A 0319110 JUMPER WIRE AIT 125mm 445 MAINBOARD A Ro31910 JUMPER WIRE AIT 125mm 446 MAINBOARD Ai 0319110 JUMPER WIRE AT 10mm 447 MAINBOARD Ai ROSi910 JUMPER WIRE 10mm J19 2 450 BOARD R0319110 JUMPER WIRE AI T 10mm MAIN BOARD R0319110 JUMPER WIRE 17 5mm MAIN BOARD R0319110 JUMPER WIRE AI T 10mm U 28 458 MAIN BOARD 0319110 JUMPE
50. 129 MOF 1 5 1 2ohm MOF 1W M A 5 1ohm MOF 1W M A 5 Em 969 MAIN BOARD INSERT FB470100 1W M A 5 10ohm a 972 MAIN BOARD INSERT 80010001 RUDH SH 112D 400 GOOD SKY 973 BOARD NSERT R0224308 BASEPIN2 36mmP 8104P S 974 BOARD R0224125 2P HOUSINGP 25mm js 975 MAIN BOARD INSERT 80224129 BASE PIN 6P HOUSING 2 4 50 1 976 BOARD INSERT 80011081 CERAMIC SPARK CAPS 1 5 50 sesar 1 977 MAIN BOARD INSERT 80009971 SW POWER 30V 0 3A JPS1258 Favortron 1 1 TACT SW 1009 50 980 MAIN BOARD INSERT 80000251 SW 1P 100G 50 SW702 1 80000251 TACTSW 1006 50 982 MAIN BOARD INSERT 80009981 POWERX FMERL35500uH Noso1_ 1 LS T 80000281 LT 988 MAIN BOARD INSERT 80000801 THERMISTOR NTCR SCK054 13 3mm ES m E 990 MAIN BOARD INSERT 224074 SINGLEPINL 11 5D 1 0 Oo Dei en Oo 2 994 MAINBOARD NSERT DD002900 CLINEARKASB43B8P faf 995 MAINBOARD INSERT 80000321 CPHOTOCOUBLEPS25014P js 1 MAIN BOARD INSERT 80000321 PHOTO COUBLE 52501 qz 999 MAINBOARD NSERT 14000041 SCREW P H2CBRITS 3 8 5BF TUNES 1000MAIN BOARD INSERT 80001041 ICTDABIZ2 NSSGS faf 1001 BOARDINSERT B000035 12114
51. 16 ground This ground pin of internal digital circuitry 72 Replacement Parts List 1 MultiSync V720 Parts List B Asia C China L LG S Samsung T Toshiba assycope PARTNO DESCRIPTION 1 LOCATION QTY ALT REMARK CABINET FRONT ASSY_ftor00se1_fcABINET FRONT 2 CABINET FRONT ASSY 11300351 PUSH BUTTON s A _ rano7er_ pusH aurron sw LLL 4 CABINETFRONTASSY 111600121 LENS S CABINETFRONTASSY 1300061 com sprna dof 6jCRTBOARDA so000561 Bean 3586081 eean faf 7 CRTBOARDA s0000561 BEAD3 5xex0 8T 5398 faf 8 CRTBOARDA GB910358 CERAMIC 2 0010602 1 GB910358 CERAMIC 25 0010602 0202 1 10 BOARD GB910358 CERAMIC Z5V F T 0 01u 50V Z MjCRTBOARDA GB210458 ceramic YSV TO u SOVZ 2 1 T2 CRTBOARDA GB210458 CERAMIC YeV TO uSOVZ 025 1 TS CRTBOARDA GA310655 T0uSOVM 5066 1 4 CRTBOARDA GB910358 CERAMIC 25 0010602 1 5 CRTBOARD AN GA322725 ELECT85oC T220016VM 506 1 t6 CRTBOARD AN GA310655 towsovm 1 1 f I7 CRTBOARDA GA410575 ELECTNP Tiu AOVM 518 faf 18 CRT BOARD GA210575 ELECT 1050C T 1u 100V M 19 CRTBOARD
52. 2Z SANKEN D112 MAIN BOARD INSERT 80003571 DIODE 200V 2A UF2003 CHENMKO MAIN BOARD INSERT 80003551 DIODE 200 1 6 RG2Z SANKEN 5 MAIN BOARD INSERT 80003571 DIODE 200V 2A UF2003 CHENMKO s s 80011241 s s SCREW P 2CBRITS 3 8 15BF 898 MAIN BOARD INSERT 80009261 DIODE SANKEN RP3F 5 D316 1 89 901 BOARD INSERT 14000071 SCREW PL CPTS 3 8 15BF 902 MAIN BOARD INSERT 0180028 FUSE HOLDER 5X20mm MAIN BOARD INSERT 80010631 JUMPER 2 54mm MAIN BOARD INSERT 80000781 MAIN BOARD INSERT _ 0010040 MAIN BOARD INSERT _ 80011481 MAIN BOARD INSERT 030010 MAIN BOARD INSERT 80007031 MAIN BOARD INSERT 80000111 MAIN BOARD INSERT 000015 MAIN BOARD INSERT 80003681 912 MAIN BOARD INSERT 80010671 MAIN BOARD INSERT 80009291 MAIN BOARD INSERT 80001811 915 MAIN BOARD INSERT 80010391 916 MAIN BOARD INSERT 80005421 MAIN BOARD INSERT 80000131 MAIN BOARD INSERT _ 18000331 MAIN BOARD INSERT JD512001 MAIN BOARD INSERT 0224301 MAIN BOARD INSERT 12800032 SINK 40 MAIN BOARD INSERT 14000041 923 MAIN BOARD INSERT EF202500 MAIN BOARD INSERT 80000901 MAIN BOARD INSERT 80000981 MAIN BOARD INSERT EF211180 MAIN BOARD INSERT 12800041 MAIN BOARD INSERT 14000041 MAIN BOARD INSERT EF206301 930 MAIN BOARD INSERT EB307720 MAIN BOARD INSERT 80000201 MAIN BOARD INSERT 80002451 MAIN BOARD INSERT _ 12600231 SINK FBT MAIN BOARD INSERT 80005561 NPN BU2520DF
53. 4 0 4 70 to 30 10 V V4 Vref R1 R2 2 17V Duty 2 17 10 V 30 51 7 to 56 7 5 X ray shutdown Specification 1 65 to 1 8V shutdown When B 25 kV we have Vout 25 Voc therefore when shutdown HV 27 5 kV we have Vout 30 8 Vpc When R1 10 7KQ and R2 10KQ we have shutdown VOL 26 8 to 28 2KV 6 Fly back input threshold voltage 10 Vp p lt Vin Vcc 12V R484 24 Vin 11 Vp p 7 Horizontal drive Low level current Minimum 100mA Low level voltage Maximum 0 4V 48 36KHz Ton 11 01 us Toff 9 66 us 53 2895 8 Pin 10 H PHASE control Control gain 2 8 8996 TH V Minimum control ROMGE 229 V10 3 8 6 8 f 31 5kHz Range 7 9 us f 64 kHz Range 3 9 us 9 Vref Vref specification 8 2 10 FVC filter FVC 0 052 V kHz V11 31 5KHz to 64KHz 1 734 to 3 53V 58 5 Vertical compensation and geometrical compensation of the raster LM1295 1 Vertical scanning frequency 50 to 100Hz 2 DC control compensation amplitude 3 Temperature stability of the vertical amplitude 1 4 Dynamic vertical deflection compensation corresponding to the secondary anode voltage drop 5 Positive and negative compensation signals Block Diagram Osc 2f ALC Cap Cap Cap Rvert Rvert 20 19 18 2 22 4 24 V Sync in gt O e Vertical O Vertical Drive 2 V Height Lever output Vertical Drive Gnd o gt 12V V Dyn GND
54. 7000111 PAD t 3 5 FORCRT 4 s 1 72 21 1050 5 7 18000281 LOOKING CABLE CLIP GL7OA 7 2 18000371 FIXED CABLE GL 115A 7 2 E s E i052 SETASSY 1700211 2 i053 SETASSY 14000021 18000271 SPACER SUPPROT PS 26GD 0000031 1056 SET ASSY 0000891 WIRE L 360mm BLACK AWG18 SET ASSY 80001931 17 ROTATION COIL 1058 SET ASSY 80010951 575 CRT GND WIRE 1059 SET ASSY R0191207 TAPE BLACK L 75mmX3 92 CABLE TIES GT 100M TIE 10615 19100572 cagiNETFRONTASSY So dof 1062 SET ASSY 10100594 BACK ew serasv ieseoerr 1065 1200051 BRACKET CABLE j 066 SETASSY 12300202 PLATE SHIELDING VIDEO Jo o Sof 1067 SET assy 15900841 PLATE INSTRUCTION 7201 1 1068 15900991 NAMEPLATEINSTRUCTIONVZ2H C 1 1069 assy __ LLL 1070 SET ASSY 17000301 FUSION T S hori serassy 1 10721 18000421 jSWTCHEXPANDOINGCOVER 11 TU7S SETASSY 18000261 So del REVISED BY ECN NO NN1020002 SORT BY ASSY CODE 93 2
55. 815GR TO 92 T 5 546 MAINBOARD 09456 NPN 2SC945P 10 92 5 507 BOARD 2 IRPNEKSASESATOSAT GAMSUNG frs 1 _ 548 MAIN BOARD 10205 PNP 25 1020 Q108 BOARD 1 SS0 MAINBOARD AN 09456 TR NPN 2SC945P 92 NPS 090 _551 MAIN BOARD an EBAO4230 42 2 7 1 Jonae faf _552 MAIN BOARD A 18157 NPN 25018156R TO 92M TPS 1 558 MAINBOARD 09456 25 945 92 5 Jons 554 BOARD AN EBA10157 25 10150 92 TPS 1 359 BOARD _ eBA07896 TR PNP NPS fonz 556 BOARD 23690 NPN 2369 92 Q301 S57 MAINBOARD EAA18157 NPN 28018156R 0 920 TPS Jaf f Boano 004 6 NPN 192 N PS owe o 559 MAINBOARD 40020 NPN 2SC4002 2 1 SANYO 1 S60 MAINBOARD AN EAA04220 NPN BF422 10 92 TP 04 faf 561 AI EBAO4230 TR 42 2 096 faf f 562 MAINBOARD 18157 TRNPN2SCISISGRTO T TPS 1 362 MAINBOARD EAADS
56. AN GA310655 ELECT8SoCIT towsovm 5939 1 20 CRTBOARDA GB910358 CERAMIC 25 0 4452 0 1 2i CRTBOARDAN GA410575 ELECTNP Tiu AOVM 5958 faf 22 GA210575 1050C T 0224 1 23 CRTBOARDA GA310655 ELECT 10050 59 Jaf P4 CRTBOARDA GA410575 ELECTNP Tiu AOVM 558 1 f 25 CRTBOARDA GA210575 1050C T 5654 1 26 CRT BOARD GB210458 CERAMIC Y5V T 0 1u 50V Z 27 GB910358 ceramic 2 o o1wsovz 29 1 28 GE210252 PLASTICPEVTO oo1wsovy faf 29 GB7471F3 470 0 SO CRTBOARDA GB7i02F3 1000P S00VK 675 1 si CRTBOARD AN GB7102H3 CERAMIC YSP BT 1000 026 Jaf SP CRTBOARDA GB7102F3 1000P S00vK 678 1 SS CRTBOARDA 88910358 CERAMIC 2 0010602 1 34 CRT BOARD GB910358 CERAMIC Z5V F T 0 01u 50V Z C281 1 35 CRTBOARD AN GB210458 ceramic YeV TO uSOVZ S6 CRTBOARDA GB210458 CERAMIC YSV TO uSOVZ 1 S7 CRTBOARDA GB210458 CERAMIC YSV TO uSOVZ 53984 1 SB CRTBOARDA GA347625 ELECT8
57. BOARD MAIN BOARD MAIN BOARD MAIN BOARD GF MAIN BOARD GE210252 MAIN BOARD GA310655 MAIN BOARD GF222452 MEF CAP BOX 0 22u 50V J s 21 MAIN BOARD GAJ10825 ELECT 105oC T 1000u 16V M PF C408 OR MAINBOARD 08910358 CERAMIC 25 0 01 5 2 1 MAINBOARD GA310745 ELECT 100035 Jij MAINBOARD AI 94310655 ELECT 5oC T1owsovM_ Jij MAINBOARD AI GE233252 PLASTIC PEvT o o033u 50v3 7 1 MAINBOARD GA310725 T00u6VM 048 1 MAINBOARD AI GA310655 ELECT 107 0 Jij MAIN BOARD GA310655 ELECT 85oC T 10u 50V M MAINBOARD GA322725 ELECT 224467 M MAINBOARD A GA347485 ELECT 047420 1 GF210252 MEF CAP BOX 0 001u 50V J GF247252 GA347455 GA322725 RO319110 GB910358 GB7102F3 GF222462 GA310555 GA347725 GB8103F5 GB7102H3 GA347625 GA310555 ELECT GA310655 MAIN BOARD GA310655 ELECT 85oC T 10u 50V M GA410585 ELECT NP T 1u 250V M GA310555 ELECT 85oC T 1u 50V M GB7471F3 CERAMIC Y5P B T 470P 500V K C341 1 233352 PEI T 0 033u 50V J C343 GF210452 CAP BOX 0 1u 50V J C343 GA347585 ELECT 85oC T 4 7u 250V M GE233352 GA310555 GB633152 GE222352 GB7102H3 210262 MEF CAP
58. ERT GJ047400 SAFETY 0 47u 275V M 846 MAIN BOARD INSERT 0010661 5 81130 MAIN BOARD INSERT 9047404 X CAP 0 47u 275V M ISKRA 88 i MAIN INSERT GJ047405 SAFETY X CAP 0 47u 275V M PHILIPS SAFETY X CAP 0 47u 275V 850 MAIN BOARD INSERT 47409 SAFETY X CAP 0 47u 250V M PILKOR C101 OR GJ04740A C101 EN 858 MAIN BOARD INSERT GJH102ES SAFETY Y CAP S 1000 400 1 854 MAIN BOARD INSERT GKA227ES POWER ELECT 850C 220440 c15 1 855 MAIN BOARD INSERT GAI0775 ELECT850C A 000 00V MTK 6130 1 858 MAIN BOARD INSERT GAA47685 ELECT 85oC A 47u 250V M MAIN BOARD INSERT 80011091 ELECT LOW ESR 100u 100V M TK MAIN BOARD INSERT GFA33382 PLASTIC 0 033u 250V J SAFETY Y CAP S 1000P 400V M 866 MAIN BOARD INSERT GFC512J2 PLASTIC PPS A 5100P 2KV J GFC532J2 870 MAIN BOARD INSERT GB9103H8 CERAMIC 25 0 0141 2 cs 1 874 MAIN BOARD INSERT GFD27482 PLASTIC PMW A 0 27u 250V J MYLAR C332 OR s s s s MAIN BOARD INSERT EJB20001 DIODE A 1N5406 MAINBOARD INSERT EJB20001 DIODE A3A iNb406 1 MAIN BOARD INSERT 80003561 DIODE 600V 1 6ARG2ASANKEN s s EN E Hs s im MAIN BOARD INSERT 80003551 DIODE 200V 1 6A RG
59. HIELDING VIDEO Jo o Saf 7e SETASSY 17000801 cushion pece BACK J o Jif 56 57 58 59 61 62 64 65 67 765 7 800091 Pcs support sso 1141 77 SETASSY 18000421 jSWTCHEXPANDONGCOVER Jif 7e SETASSY 18000261 ANODECLAMPER SPA11G def ve sETAsSY 1800036 Horner pcs For Tcocesso 8 REVISED BY ECN NO NN1060006 SORT BY ASSY CODE 95 3 Diamond 5 Different List PART NO DESCRIPTION LOCATION 10100741 FRONT PC ABS 55 CABINET FRONT ASSY 2 FRONT ASSY 11900481 PUSH BUTTON CONTROL aa S CABINETFRONTASSY 111300491 PUSHBUTTON SW Li CABINET FRONT ASSY 111600181 CABINET FRONT ASSY 13000061 6 PACKING ASSY 80001651 272 13201011 15500731 15200331 LABEL SERIAL BARCODE 7 PACKING ASSY ASSY 10 PACKING ASSY 11000331 REVOLVING STAND ASSY i S PACKING ASSY 13400491 POLYONR CARTON PACKING ASSY 13400501 JPOLYONLCARTON PACKING ASSY 13700021 BAG POLYETHYLENE 270370 eer S FOR BASE 270 370 PACKING ASSY 13700031 POLYETHYLENE 150 370 13700071 BAG 500 480 850 WARNING PACKING ASSY PACKING ASSY PACKING ASSY 18 PACKING ASSY 11000382 REVOLVING STAND ASSY 13700091 BAG POLYETHYLENE 360 360 11000381 REVOLVING STAND ASSY
60. IN U701 37 NO gt PROBLEM IN 5V LINE 7 FREQAMHz 7 PROBLEM IN 0203 12V 77V VOLTAGE 7 PINCUSHION POOR PINCUSHION PARABOLA n WAVE 7 NO CHECK U402 PIN 9 PARABOLA NO CHECK U401 PIN 4 SYNC INPUT NO YES v CHECK Q314 Q316 D308 YES CHECK U701 PIN 32 OUTPUT YES 38 CHECK C431 R432 CHECK 12V amp 0402 CIRCUIT DESCRIPTION TABLE OF CONTENTS Page Power Supply s EE 40 asua 49 2 wire serial CMOS 2 04 040040 56 Horizontal deflection signal 57 Vertical compensation and geometrical compensation of the raster 59 Horizontal drive and power supply output a 62 Horizontal amplitude control 63 Blanking and spot killer did riti 64 Video amplifier system with on screen display a 65 10 Monolithic triple 13 5nS CRT driver 67 11 On isereen display usus dd eee RERO c iens 71 39 1 Power supply circuit D Outline This power supply unit adopts the switching mode technology and is an off line mode typ
61. INTO occurs when Transmit buffer empty in DDC1 state The INTO occurs when the shift register load data from data buffer Write REG 18H will clear the transmit buffer empty condition Acknowledge is detected in DDC2B state The INTO occurs on the falling edge of the SCL clock after the acknowledge had been detected The SCL pin will be pulled low to force the bus master to wait until the service routine write REG 19H STOP condition occurs in DDC2B mode Address Initial Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bito 0018H R W FFH D7 D6 D5 D4 D3 D2 D1 DO 0019H R 40H DDC2B ADDR START STOP 0019H W 6 5 4 2 1 0 Bit Bit value 1 Bit value 0 DDC2B DDC2B state DDC1 state ADDR idus 4 Saudi tothe Address Received address equals to 1010000 RW Received R W bit is 1 Received R W bit is 0 START START condition is detected No START condition is detected STOP STOP condition is detected No STOP condition is detected ENACK Enable acknowledge Disable acknowledge A6 A5 7 bit slave address D7 D6 DO Data to be transmitted or received data 54 Pull low SCL Pull low SCL Pull low SCL SCL UU UU UU in nnnnnnnni LI 1110 1100 0 0 0 Data Data Byte SDA zu Write REG 19H to release Shif
62. IRE AI T 10mm MAIN BOARD R0319110 JUMPER WIRE AI T 10mm J9 MAIN BOARD R0319110 JUMPER WIRE AI T 10mm J9 MAIN BOARD R0319110 JUMPER WIRE 12 5mm MAIN BOARD R0319110 JUMPER WIRE AI T 12 5mm J9 MAIN BOARD 80000561 BEAD 3 5x6x0 8 T J9 82 c cic J J S30 MAINBOARD an JUMPERWIREA T125mm Wa 1 531 Ro31910 JUMPERWIREA T125mm W 1 532 MAIN BOARD R0319110 JUMPER WIRE AI T 12 5mm 533 MAINBOARD AN Ro319110 JJUMPERWIRE AIT 7 5mm Wea fif 534 MAINBOARD 0319110 JJUMPERWIRE AIT 7 5mm 5 fif 585 MAINBOARDA ___ 0319110 JUMPERWIREA T2Omm Jaf 536 90319110 JUMPERWIREA TSmm faf 537 AN 0319110 JUMPERWIREA T75mm faf 538 BOARD Ai 80919110 JUMPER WIRE AIT 7 5mm 308 faf 539 BOARD 72900588 01 0701 MAINBOARD V3 MANPCB 1 540 MAIN BOARD 80003831 IC REGULATOR TL431 817B 4P EAA18157 TRNPN2SCTSISGR TOT TPS 1 S42 MAINBOARD A EAA09456 NPN 250945 92 NPS 05 OR _543 MAIN BOARD A EAA2328 NPN 2328A 92 1 SAMSUNG 1 544 MAINBOARD A 22855 NPN 2SC2235Y TO 92 T TOSHIBA 006 OR TR NPN 2SC1
63. M a SET z g i Th yn J 518 Troc 4 5 UOSIIS4
64. MODELS MultiSync V720 EG MultiSync V721 Diamand Scan 71 Model No N0701 Series COLOR MONITOR SERVICE MANUAL Better Service Better Reputation Better Profit MITSUBISHI NEC MITSUBISHI ELECTRIC VISUAL SYSTEMS A WARNING The SERVICE PERSONNEL should have the appropriate technical training knowledge and experience necessary to Be familiar with specialized test equipment and Be carelul to follow all safety procedures associated with high voltage CRT circuit designs to minimize danger to themselves and their coworkers To avoid electrical chocks this equipment should be used with an appropriate power cord and be connected only to a properly grounded AC outlet This equipment utilized a micro gap power switch Turn off the monitor by first pushing the front panel power switch Next remove the power cord from the AC outlet To prevent fire or shock hazards do not expose this unit to rain or moisture This symbol warns the personnel that un insulated voltage within the unit may have sufficient magnitude to cause electric shock This symbol alerts the personnel that important literature concerning the operation and maintenance of this unit has been included Therefore it should be read carefully in order to avoid any problems 2 AN PRODUCT SAFETY CAUTION When parts replacement is required for servicing always use the manufacturer s specified replacement
65. N BOARD EJA05819 MAIN BOARD 044148 DIODE 1N4148 400 MAIN BOARD R0319110 JUMPER WIRE 17 5mm 01 MAIN BOARD R0319110 JUMPER WIRE AI T 10mm 02 MAIN BOARD R0319110 JUMPER WIRE AI T 10mm 403 MAIN BOARD A l R0319110 JUMPER WIRE AI T 20mm 404 MAIN BOARD R0319110 JUMPER WIRE AI T 10mm 405 MAIN BOARD R0319110 JUMPER WIRE AI T 20mm 406 MAIN BOARD 0319110 407 BOARD 0319110 08 MAIN BOARD R0319110 09 MAIN BOARD R0319110 JUMPER WIRE 12 5mm 410 MAIN BOARD R0319110 411 MAIN BOARD Ro319110 JUMPER WIRE A T 125mm ut 412 MAIN BOARD R0319110 413 MAIN BOARD R0319110 JUMPER WIRE AI T 15mm MAIN BOARD R0319110 JUMPER WIRE 7 5mm 415 MAIN BOARD R0319110 JUMPER WIRE 15mm 416 MAIN BOARD R0319110 JUMPER WIRE 12 5mm 417 MAIN BOARD R0319110 JUMPER WIRE 10mm 418 MAIN BOARD R0319110 419 MAIN BOARD R0319110 420 MAIN BOARD R0319110 JUMPER WIRE 10mm R0319110 R0319110 JUMPER WIRE AI T 12 5mm MAINBOARD AI MAINBOARD AI MAINBOARD AI 401 BOARD Aan 402 BOARD An MAINBOARD AN MAINBOARD AI 33 MAIN BOARD 423 MAIN BOARD 424 MAINBOARD A Ro319110 JUMPER WIRE AT 125mm 425 MAINBOARD A JUMPER WIRE AIT 125mm 426 MAIN BOARD 0319
66. OARD R0319110 JUMPER WIRE 10mm 495 MAIN BOARD R0319110 JUMPER WIRE 10mm 496 BOARD R0319110 JUMPER WIRE 17 5mm MAIN BOARD 0319110 498 BOARD 80319110 JUMPER WIRE 7 5mm 499 BOARD 80319110 MAIN BOARD 0319110 501 MAIN BOARD R0319110 JUMPER WIRE A T 7 5mm si 502 MAIN BOARD R0319110 3 MAIN BOARD R0319110 JUMPER WIRE 12 5mm 504 BOARD 0319110 JUMPER WIRE 175mm 7 505 MAIN BOARD R0319110 JUMPER WIRE 10mm 506 MAIN BOARD R0319110 JUMPER WIRE 12 5mm MAIN BOARD 0319110 508 BOARD R0319110 JUMPER WIRE 17 5mm MAIN BOARD R0319110 JUMPER WIRE AIT 7 5mm 5 MAIN BOARD R0319110 JUMPER WIRE AT 20mm J80 MAIN BOARD R0319110 JUMPER WIRE 12 5mm 512 MAIN BOARD 0319110 JUMPER WIREA T 10mm 8 513 MAIN BOARD 0319110 JUMPER WIRE 10mm ee MAIN BOARD 0319110 MAIN BOARD R0319110 J8 516 BOARD Ro319110 JUMPER WIRE A T 125mm se MAIN BOARD R0319110 JUMPER WIRE AI T 10mm MAIN BOARD A l R0319110 JUMPER WIRE AIT 125mm 8 MAIN BOARD R0319110 JUMPER WIRE 15mm MAIN BOARD 0319110 JUMPER WIRE AIT 175mm MAIN BOARD 0319110 JUMPER WIREA T 15mm MAIN BOARD R0319110 JUMPER WIRE AI T 12 5mm MAIN BOARD R0319110 JUMPER WIRE AI T 10mm MAIN BOARD R0319110 JJUMPER W
67. PLUG AND PLAY COMMUNICATION 28 TROUBLE SHOOTIN Gis M me imn OD d e A 31 CIRCUIT DESCRIPTION 2 Ditto Irt aie a aQ 39 REPLACEMENT PARTS d ts estar m a be 73 1 et aetati pectine Reus 73 2 MultiSync V721 Different List Re tiec be uiuos 94 3 Diamond Scan 71 Different 96 BLOCK DIAGRAMS ah qha 98 SCHEMATIC DIAGRAMS pte PU aM 99 1 Video Board us P 99 2 Main Board siars 100 1 Precautions Follow these safety and servicing precautions to prevent damage and to protect against potential hazards such as electrical shock and X rays 1 1 Safety Precautions 1 1 1 Warnings For safety purpose do not attempt to modify the circuit board and always disconnect the AC power before performing servicing on the monitor Operation of the monitor outside its cabinet or with the cover removed involves the risk of shock hazard Repair work on the monitor should only be attempted by service personnel who are thoroughly familiar with all necessary safety precautions and procedures for working on high voltage equipment Do not lift the CRT by the neck After completely discharging the high voltage anode handle the CRT only when wearing sha
68. R WIRE AI T 7 5mm JUMPER WIRE 12 5mm 45 JUMPER WIRE AUT 15mm MAIN BOARD R0319110 JUMPER WIRE 7 5mm 467 BOARD A 10319110 JUMPER WIRE 75mm 468 MAIN BOARD 10319110 JUMPER WIRE AVT 10mm 69 BOARD R0319110 JUMPER WIRE 10mm BERI 472 MAIN BOARD 0319110 JUMPER WIRE AI T 10mm MAIN BOARD 0319110 JJUMPER WIRE AI T 12 5mm MAIN BOARD 0319110 JUMPER WIRE AI T 20mm MAIN BOARD 0319110 JUMPER WIRE 7 5mm MAIN BOARD 0319110 JUMPER WIRE 10mm 81 467 468 469 470 471 472 47 477 BOARD R0319110 JUMPER WIRE AI T 10mm MAIN BOARD R0319110 JJUMPER WIRE AI T 10mm MAIN BOARD R0319110 JUMPER WIRE 12 5mm 480 MAIN BOARD R0319110 JUMPER WIRE 10mm 481 BOARD R0319110 JUMPER 7 5 482 MAIN BOARD R0319110 483 MAIN BOARD R0319110 JUMPER WIRE 12 5 484 MAIN BOARD R0319110 JUMPER WIRE 12 5mm MAIN BOARD R0319110 JUMPER WIRE AIT 125mm 5 MAIN BOARD R0319110 JUMPER WIRE A T 17 5mm 56 MAIN BOARD R0319110 JUMPER WIRE 17 5mm 488 MAIN BOARD R0319110 JUMPER WIRE AT 10mm MAIN BOARD R0319110 59 MAIN BOARD R0319110 491 MAIN BOARD R0319110 JUMPER WIRE 12 5mm 492 MAIN BOARD R0319110 493 MAIN BOARD R0319110 494 MAIN B
69. S RNPNZSCMSPTOSAT NPS 096 564 MAIN BOARD EFA29610 TR 2SK2961 FET S65 MAINBOARD AN 10157 TRPNP2SATOISGRTOSaT TPS 919 faf f seeman Boano ai 2 jose fon 567 MAINBOARD 0920 ksPo2 T092 91 116 S68 MAINBOARD EBA04230 TR 42 927 1 9515 faf f 569 MAINBOARD 06673 NPN 250667 TO 92 T itach 1 570MAINBOARD EAA18157 TRNPN2SCIBISGR TO 9XT TPS 1 LSTUMANBOARDA EAADSS RNENZSOMSPTOSAT NPS 0 0 572 MAIN BOARD EAA18157 NPN 2SC1815GR TO En 0323 enAoo4se TR NPN ascose 0207 wes on S74 MAINBOARD AN 1815 NPN 28018156R TO 92 TRS 4 1 575 MAINBOARD A 09456 NPN 2SC945P 92 5 054 OR 576 AN EAA18157 NPN 25018156R 20 TRS faf S77 MAINBOARD _ EAAOS456 NPN 2SC945P 92 NPS 4 578 MAINBOARD AN EAA18157 NPN 25018156R TO 92M TRS 0 1 570 MAINBOARD A EAA09456 TR NPN 2SC945P TO 92 T NPS 02 OR 580 MAIN BOARD 18157 NPN 2SC1815GR TO 92 T T P S Q601 1 TR NPN 2SC945P 92 5 c o MAIN BOARD EAA18157 NPN 2SC1815GR TO 92 T 5 Q603
70. SINGLE PIN 1P L 14mm 2 36mm CRT BOARD INSERT 80001751 17 290 NECK CRT SOCKET ORT SOCKET 200 CRT BOARD INSERT 80005011 CRT SOCKET 29D PIN 12 GND CRT BOARD INSERT 14000041 SCREW P 2CBRITS 3 8 15BF FOR U203 CRT BOARD INSERT HB013100 PACKING COIL T 10 24 CRT BOARD INSERT HBooooos CHOKE 100uH 8X10 CRT BOARD INSERT 00008 CHOKE 100uH 8X10 CRT BOARD INSERT FB910229 FUSIBLE MF RES 1 4W 2 20hm J CRT BOARD INSERT 190224129 CRT BOARD INSERT R0224127 PIN 4P CRT BOARD INSERT 224129 CRT BOARD INSERT R0224130 5205 CRT BOARD INSERT 0000631 201 CRT BOARD INSERT 80003661 CRT BOARD INSERT 0001941 CRT BOARD INSERT FF300203 CRT BOARD INSERT FF300203 CRT BOARD INSERT FF300203 CARBON 6mm 20K B 194 BOARD INSERT 12600112 HEAT SINK VIDEO 195 BOARD 006002 3 5 4 7 MAIN 80000561 3 5x6x0 8 T MAIN BOARD 198 MAIN BOARD R0319110 JUMPER WIRE AI T 10mm HC006002 BEAD 3 5X4 7 T MAIN BOARD HC006002 BEAD 3 5X4 7 T MAIN BOARD HC006002 BEAD 3 5X4 7 T MAIN BOARD R0319110 JUMPER WIRE AI T 10mm MAIN BOARD 0000561 3 5x6x0 8 T MAIN BOARD 0000561 3 5x6x0 8 T 109 MAIN BOARD 006002 BEAD 3 5X4 7 T MAIN BOARD 006002 3 5 4 7 MAIN BOARD 006002 3 5 4 7
71. SoC T47uU16VM 5986 1 GB7i02F3 CERAMIC 1000P S00vK 1 40 CRTBOARDA GA347625 ELECT8SoC T47uU16VM 5988 1 4i CRTBOARD an GB910358 CERAMIC 25 0 4452 1 42 CRT BOARD GA310655 ELECT 850C T 10u 50V M 4S CRTBOARD AN 94310655 ELECT8SoCIT towsovm 598 1 44 CRTBOARDA GB910358 CERAMIC 2 o o1wsovz 1 45 CRTBOARDA GE210352 LASTICPEVTOOiuEQVJ 596 1 46 CRTBOARDA GE210352 PENT 001487 596 1 47 CRTBOARDA GB7i02F3 CERAMIC 1000P S00vK 1 48 CRTBOARDA GB910358 CERAMIC 25 0010602 596 1 49 CRTBOARDA 0 7 pionen 1a 1N4036 pea faf 50 CRT BOARD EJ044148 DIODE T 1N4148 DIODE 1N4148 DIODE 1N4148 53 CRT BOARD 044148 DIODE T 1N4148 CRT BOARD EJ044148 DIODE T 1N4148 55 CRT BOARD 044148 DIODE T 1N4148 80000051 60 CRT BOARD an 80000451 1 2W 19983 80000051 80001211 DIODE T 1 2W 21 PHILIPS CRT BOARD 80004711 ROHM DIODE 155244 CRT BOARD 80000451 CRT BOARD 0000051 66 0 BOARD 0001211 CRT BOARD 0004711 68 CRT BOARD EJ044148 DIODE T 1N4148 69 CRT BOARD 044148 DIODE
72. T SPECIFICATIONS TABLE OF CONTENTS Page 1 Adjustment amp Inspection tm tte ete rp e eter t ertet RR I Lt A t fente sel ege 3 Definition for Normal Condition n nn 4 Hot Key Operation ren oe tue Dee by B Adjustment intet ehe ee teinte enge ed et edite Enti EET Fs Ve Adjustment 8 H Raster Center Adjustment U u 9 Pre Adjustment hisua tiya lama 10 White Balance u A Ds 3 wt CU LO PATULAE White Balance Adjustment Factory Auto Adjustment 2 Maximum Brightness Adjustmenrt U U 1 12 Convergence AdjUst L eter ated cn ented Nev ees 13 Power Saving Function 14 Geometry Adjustment 15 DCC 1 2B Writing and 16 5 CONGIION L Ll 17 Adjustment Magnetic 0
73. al Condition A B C D E Hot Key Operation Input AC Voltage 110V 60HZ Warm up time 30 minutes Crosshatch Reverse Pattern ALL VR s Adjust Center Position Color temperature setting 9300 OSD I CON R G B gain control bar center position in Factory Mode A Factory Mode SELECT Key UP Key if pressed when the power SW on B OSD Position Control Mode DOWN Key if pressed when the power SW on 17 5 B Adjustment A B C D MODE No 12 Pattern Full white Brightness just cut off Adjust VR101 to make the cathode of D112 has 13 6V Check other power source should be 78 62V 6 2V 100 53 5V 101 5 11 5 100 5 6 X RAY Test A Mode No 12 B Pattern Normal Crosshatch Brightness just cut off C Test 1 Use Hi Voltage probe 2 Adjust VR102 until X RAY protector is operated then check the protection voltage should be 29 5KV or less 3 After X RAY protection test turn back the VR102 position to center 7 H V Adjustment A Mode No 12 B Pattern Full White Brightness just cut off C Adjust VR102 to make the cathode of D114 has 117V LG CRT 118V Samsung CRT 103V TOSHIBA CRT 117V Matsushita CRT D Check the high voltage is 25 8kV 1kV 8 H Raster Center Adjustment A Mode No 18 B Pattern Crosshatch Reverse Adjust the Brightness Control that the background be visible D Ch
74. ange SW301 position to make the mostly near center background position 9 Mode 12 Pre Adjustment A Mode No 12 B Pattern Crosshatch Enter to Factory mode Adjust H phase V center H size V size Pincushion Trapezoid Bow Parallelogram and rotation to make Picture Position Center and Picture Size 310 232mm 10 White Balance Adjustment A Setting Enter Factory Mode Mode No 12 Pattern Full White Warm up 30 min Make External Degauss B Cut Off Adjustment 1 Select the color Mode 9300K 2 Cut Off Adjustment Video Signal Off 0 vp p Bright Control set to Mex Adjust VR301 VR307 for Toshiba CRT at the Brightness 1 1 5FL 3 4 5 1 cd m2 18 3 Adjust VR210 VR230 and VR250 to make 283 297 with readjusting VR301 VR307 for Toshiba CRT to keep the brightness between 1 1 5FL 3 4 5 1 cd m2 C White Balance Adjustment Factory Auto Adjustment 1 9300K Select the color Mode 9300 1 50 50mm Green block Pattern Brightness Control set to Max Contrast Control set to Max Adjust gain control to Y 45F LL 154 cd m2 2 Change Pattern to Full White Brightness control set to Min 3 Adjust R gain control B gain control to X 283 Y 297 at the contrast control is adjusted 15FL 52cd m2 4 Check the color tracking shall be 283 1015 297 1015 between Y 5 25FT L 17 86cd m2 condition 2 7500K Select the color Mode 7500 1 50 50mm Green block Pattern Brightness Cont
75. apacitance in the application Figure 8 also shows the effect inductance has on the rise and fall times EFFECT OF OFFSET Figure 7 shows the variation in rise and fall times when the output offset of the device is varied from 40 to 50 rise time shows a maximum variation relative to the center data point 45 Voc of about 2 The fall time shows varia tion of about 2 relative to the center data point THERMAL CONSIDERATIONS Figure 4 shows the performance of the LM2438 in the test circuit shown in Figure 2 as a function of case temperature The figure shows that the rise time of the LM2438 increases by approximately 5 as the case temperature increases from 50 C to 100 C This corresponds to a speed degrada tion of 1 for every 10 C rise in case temperature The fall time increases by approximately 7 5 as the case tempera ture increases from 50 C to 100 C This corresponds to a Speed degradation of 1 596 for every 10 C rise in case tem perature Figure 6 shows the maximum power dissipation of the LM2438 vs Frequency when all three channels of the device are driving an 8 pF load with a 40 alternating one pixel on one pixel off signal The graph assumes a 72 active time device operating at the specified frequency which is typical in a monitor application The other 28 of the time www national com 69 the device is assumed to be sitting at the black level 65V in this case This graph gives the designer
76. at 45 67 with vertical blanking pulse 12Vpp VG1 V x R11 R10 R11 V V1 3 When power off the voltage V1 gt V2 then Q6 turn on pulling VG1 to 180V to protect CRT 4 When Mute set to lower the off G1 180V screen cut off no picture display this mute circuit makes active at power ON OFF and when mode change stage 5 QA bias set up by MCU to control the bias of then control G1 voltage output Test points for maintenance 1 Check D1 R3 and Q1 collector 2 G1 voltage control 45 67VDC G1 off momentary voltage 19 180 64 9 Video amplifier system with on screen display LM1281 U201 Outstanding features Three channel video amplifier bandwidth 85 MHz 3 dB 4 Vp p output OSD TTL input bandwidth 50 MHz High speed video OSD changeover High impedance DC contrast control above the 0 4V 40dB range High impedance DC OSD contrast control above the 0 4V 40dB range Red OSD Input Green OSD Input Blue OSD Input Video OSD Switch Red Video In Green Video In Vcci Ground Blue Video In VREF Video Contrast OSD Contrast 1 Description of the functions BLOCK AND CONNECTION DIAGRAM
77. athode pin of the CRT connector This is done to minimize the length of the video path between these two components Note also that D16 D17 R21 and D9 are placed to minimize the size of the video nodes that they are attached to This minimizes parasitic capacitance in the video path and also enhances the effectiveness of the pro tection diodes The anode of protection diode D17 is con nected directly to a section of the the ground plane that has a short and direct path to the LM2438 ground pins The cath ode of D16 is connected to Vcc very close to decoupling ca pacitor C53 see Figure 13 which is connected to the same section of the ground plane as D17 The diode placement and routing is very important for minimizing the voltage stress on the LM2438 during an arcover event Lastly notice that S1 is placed very close to the red cathode and is tied di rectly to CRT ground 08101043 15 FIGURE 10 Waveform at Cathode with LM1279 243X Demo Board 70 www national com 11 Screen Display FEATURES e Horizontal sync input may be up to 100 kHz circuitry up to 90 2 pixel rate for multi sync operation e Programmable horizontal resolutions up to 1524 dots per display row e 538 bytes display registers to control full screen display Full screen display consists of 10 rows by 24 columns characters 12x 18 dot matrix per character 128 built in characters and graphic symbols and character b
78. can the electron beam and will affect the purity focus convergence Caution Allow a minimum interval of 20 minutes to elapse between uses of the degauss function 9300KColor Temperature Select the Color Temperature icon on Icon Select Window and push SELECT button It can be switched the different color Temperature OSD There are 3 background colors Blue Black and white These can be selected by SELECT button after the selection of OSD on Icon select window exit EXIT To exit the OSM window Select EXIT on Icon select window Then push SELECT button to exit OSM window Note If you do not push buttons over 10 seconds in OSM condition the window will automatically disappear 11 SERIAL NUMBER INFORMATION Refer to the serial number information shown below Ex SERIAL NUMBER LABEL MODEL SERIAL No Manufactured Year Last digit Manufactured Month January to September 1109 October x 00001 on ward November Y Start from 00001 when December Z month is changed Factory mark NPG CHINA Control Code E Control Code A only DiamondScan 71 12 DISASSEMBLY Tilt swivel base fixing removing Fixing This product consists of the MultiSync monitor and the tilt swivel base When fixing the tilt swivel base to the MultiSync monitor please follow the steps below e Push the six hooks the tilt swive
79. ctivate degauss while power on 2 CS output 3 pins CS2 CS1 CSO for CS control H sync CS2 CS1 cso H sync lt 33 25KHz 0 0 0 33 25KHz lt H sync lt 36 50KHz 0 1 0 36 50KHz lt H sync lt 40 50KHz 0 1 1 40 50KHz lt H sync lt 45 10KHz 1 0 0 45 10KHz lt H sync lt 51 60KHz 1 0 1 51 60KHz lt H sync lt 55 10KHz 1 1 0 55 10KHz lt H sync lt 62 15KHz 1 1 0 62 15KHz lt H sync 1 1 1 Mode change 0 0 0 43 3 Power saving 2 pins PMUS PMUO for power saving control if Hf gt 70KHz or Hf lt 23 2 enter power saving mode suspend enter power saving mode after 3 sec when condition met enter suspend mode first for 3 sec before enter off mode if off mode condition met Mode H svnc freq V svnc freq Burn in ID PMUS PMUO Normal Yes Yes 1 1 Stand By No Yes 0 1 Suspend Yes No 0 1 Off No No Low 0 0 Burn in No No High 1 1 4 Mute 2 pins for screen mute Mute1 active low pulse for about 0 6 sec when mode change Mute2 active low pulse for about 1 0 sec when mode change active with mute 1 simultaneously 5 D A 14 pins PWM output are Brightness Contrast H phase H size V center V size Pincushion Trapezoid Rotation Parallel Pin balance R gain G gain and B gain DAC value 255 means the maximum output volts except Parallel PWM All D A except Rotation Brightness Contrast R gain G gain B gain are mode dep
80. d when a new device address is received 3 Store R W bit and decide the direction of SDA pin The R W bit on the SDA pin will be stored in the RW bit 4 Acknowledge bit control detection Acknowledge bit control in receive direction If ENACK 1 and address compare is true response acknowledge Acknowledge bit 0 If ENACK 0 or address compare is false response non acknowledge Acknowledge bit 1 Acknowledge bit detect in transmit direction If the acknowledge bit is 1 the DDC interface will be disabled and release the SDA pin If the acknowledge bit is 0 the DDC interface keeps on communicating 53 5 Data bytes transmit receive If the RW bit is 1 the shift register will load data from the data buffer REG 18H before the data byte is transmitted and shift out data to the SDA pin before the rising edge of the SCL clock If the RW bit is 0 the shift register will shift in data on the rising edge of the SCL clock and the whole qata byte is latched to the data buffer REG 18H 6 Handshaking procedure The handshaking is done on the byte level The DDC interface will hold the SCL pin low after the ac knowledge bit automatically The bus master will be forced to wait until the WT6018 is ready for the next byte transfer To release the SCL pin write REG 19H will release clear the wait state 7 Interrupt INTO The DDC interface interrupt is enabled by setting the IEN_D bit in the REG 1AH Interrupt
81. e Download EDID from PC to Monitor DDC1 Inspection DDC2B Inspection 30 TROUBLE SHOOTING Refer to User s Manual trouble shooting section before using this chart TABLE OF CONTENTS Page NO OPERATION POWER LED FLASH 32 NO OPERATION POWER LED lev ena 33 VIDEO NOISE OUT OF 34 ANO VIDE remem teem pre 35 Wende 36 TROUBEE IN AN SYNG eret eu cade D e hw GS ere ue aspa 37 y dan pa e yao aa eiae nare aea e era 38 31 1 NO OPERATION POWER LED FLASH POWER LED FLASH ULTIMETER TES Q307 Q102 110 D111 D112 D11 gt Say CHECK U102 p U102PIN6 wo PULDSEOP POWERSW TURNOFF lt gt 1 DC P S O P VOLTAGE SET AT 17V CURRENT SET 600MA POSITIVE CONNECT TO 130 NEGATIVE CONNECT TO U105 pin 5 2 SCOPE SET AT 10V DIV 10US DIV PROBE CONNECT TO Q102 GATE AND U103pin 5 CHECK U102 PIN 7 VCC PIN 4 SAWTOOTH PIN 8 5V POWER SW TURN OFF FAILURE R136 ZD103 32 2 POWER SW TURN OFF CHECK F101 CHECK Q101 1 DC P S
82. e LM2438 is shown in Figure 1 The PNP emitter follower Q5 provides input buffering Q1 and Q2 form a fixed gain cascode amplifier with resistors R1 and R2 setting the gain at 14 Emitter followers Q3 and Q4 iso late the high output impedance of the cascode stage from the capacitance of the CRT cathode which decreases the sensitivity of the device to load capacitance Q6 provides bi asing to the output emitter follower stage to reduce cross over distortion at low signal levels Figure 2 shows a typical test circuit for evaluation of the LM2438 This circuit is designed to allow testing of the LM2438 500 environment without the use of an expen sive FET probe In this test circuit the two 2 49 resistors form a 200 1 wideband low capacitance probe when con nected to a 509 coaxial cable and a 500 load such as a 500 oscilloscope input The input signal from the generator is ac coupled to the base of Q5 Application Hints INTRODUCTION National Semiconductor NSC is committed to provide ap plication information that assists our customers in obtaining the best performance possible from our products The follow ing information is provided in order to support this commit ment The reader should be aware that the optimization of performance was done using a specific printed circuit board designed at NSC Variations in performance can be realized due to physical changes in the printed circuit board and the application There
83. e unit that provided several different DC outputs The scanning frequency is available in different values ranging from 31 kHz to 69 kHz Moreover it is capable to operate at an AC input voltage of 100V 240V and an AC frequency of 50 60 Hz 3Hz The block diagram is the functional construction schematics that shows the major functions of this power supply unit Harmonics OPTION L107 is harmonic choke circuit that reduces the harmonic peak currents for the purpose of fulfilling the requirement items of IEC 1000 3 2 The EMI circuit has a 2 stage construction with the first stage consisting of the common mode choke unit and one X capacitor and the second stage consisting of the common mode choke unit and four Y capacitors R101 is the bleed resistor of the X capacitor When the power supply switch is turned OFF this resistor carries out the emergency charging of the capacitor C101 The EMI is the circuit that prevents the monitor switching noise from being generated there by minimiz ing the negative influence on the other electronic equipment AC rectifier and smoothing capacitor The AC input is rectified by means of the full bridge rectifier that consists of the diodes D101 to D104 The AC voltage is converted into the DC voltage by passing through the next stage that consists of the smoothing capacitor C105 TH101 is a NTC thermistor for the power supply at the in rush current limit Degaussing circuit The degauss
84. endent functions Parallel is voltage inverter function 6 Sync output 2 pins for and V sync negative output normal high 7 DDC 2 pins DDC SDA DDC SCL for DDC1 DDC2B or auto alignment control In auto alignment mode all keys and OSD are disabled 8 SDA SCL 2 pins for EEPROM and OSD control 9 WP 1 pin high for EEPROM write protect Control Panel Operation O SELECT RESET POWER 1 Key arrangement 3 keys for OSD control 2 Hot key operation A Factory Mode SELECT Key UP Key if pressed when the power SW on B OSD Position Control Mode DOWN Key if pressed when the power SW on C Aging mode Select key if pressed when the power SW on 44 IIC interface 1 DDC1 DDC2B VESA DDC1 DDC2B is supported 2 Auto alignment auto alignment protocol is supported Timing Table Total 24 modes 1 Factory mode 20 modes indicate do not care Mode Resolution H svnc V svnc H polaritv V polaritv 1 VGA 350 31 5KHz 70Hz 2 VGA 400 31 5KHz 70Hz 3 VGA 480 31 5KHz 60Hz 4 MACII 35k 35 0KHz 66Hz 5 _ 800 600 56 35 2KHz 56Hz ii 6 8514 35 5KHz 87Hz i 7 640 480 75 37 5KHz 75Hz 8 EVGA 400 37 8KHz 84Hz 9 800 600 60 37 8KHz 60Hz i 10 640 480 85 43 3KHz 85Hz 11 1800 600 75 46 8KHz 75Hz i 12 1024 768 60 48 3KHz 60Hz x t
85. er than 15 25Hz OVF2 1 set H V bit to 1 and check VSYNC frequency again If VSYNC still has no frequency that is power saving condition program should reset H V bit If it has a valid frequency the HSYNC input is composite signal 49 Frequency Calculation Horizontal frequency and vertical frequencies calculation are done by using one 10 bit up counter After power is on the SYNC processor calculates the vertical frequency first H V bit 0 A 31 25KHz clock counts the time interval between two VSYNC pulses then sets the FRDY bit and generates an INT1 inter rupt if IEN_S bit is 1 The software can either use interrupt or polling the FRDY bit to read the correct vertical frequency After reading the REG 16H the FRDY bit is cleared to 0 counter is reset and H V bit is set The SYNC processor starts to count horizontal frequency The horizontal frequency calculation is done by counting the HSYNC pulses in 8 192 ms Like the vertical frequency the horizontal frequency can be read when the FRDY bit is set or INT1 occurs After reading the REG 16H the FRDY INT_S and H V bits are cleared The SYNC processor starts to calculate the vertical frequency again and so on The relationships between counter value and frequency are Hfreq counter value x 122 07 Hz Vfreq 31250 counter value Hz The frequency range Hfreq range 122 07 Hz to 124 8 kHz Resolution 122 07Hz Vfreq range 30 5 Hz to 31 25 kHz If co
86. ess SELECT key then OSD display following figure Fig 14 and only 3 icons OSD H position OSD V position ESC can be selected Fig 14 Function explanation XO Brightness Adjusts the overall image and background screen brightness Contrast Adjusts the image brightness in relation to the background Contrast control is also effective with button even through OSM window is not existing Red Color Control Adjust the red contrast of the display Green Color Control Adjust the green contrast of the display Blue Color Control Adjust the blue contrast of the display Horizontal position Moves the image horizontally left or right Vertical position Moves the image vertically up or down Horizontal size Increases or decreases the horizontal size of the image Vertical size Increases or decreases the vertical size of the image Pincushion Barrel Increases or decreases the curvature of the sides either inward or outward Trapezoid Increases or decreases the bottom of the screen to be the same as the top Parallelogram Increases or decreases the tilt of the sides either to the left or right D X Lb BRE SL gt Bow Pincushion Balance Increases or decreases the curvature of the sides either left or right Rotation Rotate the image 10 A Degauss Select the degauss icon on Icon select window and push SELECT button It will eliminate the stray magnetic field and correct the s
87. ey to close DAV value bar and UP key or DOWN key to select the other icon g ESPECIAL FUNCTION OPERATION 1 Degauss Active If selected icon is degauss icon press SELECT key to activate degauss Fig 3 Fig 3 2 Color Temperature Select If selected icon is 9300 7500 6500 color icon press SELECT key to select Color Temperature for 9300 7500 6500 or user defined Fig 4 7 Fig 4 Fig 5 Fig 6 Fig 7 3 OSD Color Select If OSD icon is selected press SELECT key to change OSD color there are three kinds of OSD color can be selected Fig 8 10 Fig 8 Fig 9 Fig 10 Background white blue black Action icon red red red Normal icon black white white Value bar blue yellow green 4 SYNC OSD Display If EXIT icon is selected press SELECT key to close OSD menu and then display sync information for 2 sec This sync information will not be close until release SELECT key Fig 11 Hori syne Wer syng FPS Fig 11 5 Factory mode Press SELECT key UP key and power on system enter factory mode OSD will display FA to indicate in factory mode Fig 12 13 Operation of factory mode is same as normal mode except below 2 condition a adjustment value is saved to user and factory area b R G B value are saved to current color temperature Fig 12 6 OSD Move Mode Press DOWN key and power on system enter OSD move mode user can move OSD display position in this mode Pr
88. f Philips Corporation DDC is a trademark of video Electronics Standard Association VESA 47 PC2 PIN DESCRIPTION Pin Pin Descriptions 40 42 111 DA2 O D A converter 2 Open drain output External applied voltage can up to 10V 2 2 DA1 O D A converter 1 Open drain output External applied voltage can up to 10V 3 3 DA0 O D A converter 0 Open drain output External applied voltage can up 10V 414 RESET jReset Active low Schmitt trigger input Internal pull high 5 5 VDD Power supply 5V 6 7 GND Ground 0V 7 8 OSCO O Oscillator Output Connects a 8MHz crystal 8 9 OSCI Oscillator Input Connects a 8MHz crystal 9 10 PB5 SDA2 Port B5 or data pin This pin can be an port or serial data pin 10 11 PB4 SCL2 lO JUO Port B4 data pin This pin can be port clock pin 11 12 or self test pattern output When as port it is same as 5 When it is configured to test pattern output a video signal is output 12 18 2 Port B2 Same as PBO 13 14 1 lO Port B1 Same as PBO 14 15 PBO I O Port BO When it is an input pin it has an internal pull up resistor When it is an output pin the source sink c
89. f the parabola are controlled by the BOW CNTRL PIN 13 In both cases the control is carried out in the DC mode 12 V Dyn Focus control Pin 15 The voltage is within the 0V to 4V range When the voltage falls within the 2V 4V range the parabola becomes positive On the other hand when the voltage falls within the 0V 2V range the parabola becomes negative 13 V Dyn Focus Pin 16 14 ALC Cap Pin 18 This is the Automatic level Controller ALC capacitor and the recommended value is 4 7 uF 15 Frequency doubling capacitor This is the vertical oscillator that locks at a frequency twice as high as the vertical synchronization frequency Its capacitance is 0 47 uF 16 OSC Cap Pin 20 The value of the capacitance is 0 1 uF 17 Rvert Pin 21 22 The vertical resistor has the function of determining the gain of the vertical ramp current generator 18 V drive Pin 23 and V drive PIN 24 V is the negative portion of the vertical ramp output current of the object of the operation The ramp current waveform is superimposed on the DC current of the approximately 315 uA The voltage corresponding to the output typically 10 is typically 6V 61 Horizontal drive and power supply output Circuit Diagram R1 2 lt H 578 K DR 02 R3 T zl Tes df c2 MUI Description of the circuit 1 R1 T1 and Q2 compose the horiz
90. fore the designer should know that com ponent value changes may be required in order to optimize performance in a given application The values shown in this document can be used as a starting point for evaluation pur poses When working with high bandwidth circuits good lay out practices are also critical to achieving maximum perfor mance IMPORTANT INFORMATION The LM2438 performance is targeted for the XGA 1024 x 768 60 Hz refresh resolution market The application cir cuits shown in this document to optimize performance and to protect against damage from CRT arcover are designed spe cifically for the LM2438 If another member of the LM243X family is used please refer to its datasheet POWER SUPPLY BYPASS Since the LM2438 is a wide bandwidth amplifier proper power supply bypassing is critical for optimum performance Improper power supply bypassing can result in large over shoot ringing or oscillation 0 1 capacitors should con nected from the supply pins Vcc and Ves to ground as close to the LM2438 as is practical Additionally a 47 or larger electrolytic capacitor should be connected from both supply pins to ground reasonably close to the LM2438 ARC PROTECTION During normal CRT operation internal arcing may occasion ally occur Spark gaps in the range of 200V connected from the CRT cathodes to CRT ground will limit the maximum volt 68 age but to a value that is much higher than allowable
91. g servicing covered by this service manual read and follow the Safety Precau tions section of this manual Note If unforeseen conflict between the following servicing precautions and of the safety precautions always follow the safety precautions 1 Follow closely the servicing precautions printed on the monitor cabinet and chassis 2 Always unplug the AC power cord from the AC power source before removing or installing any compo nent or assembly disconnection PCB plugs or connectors and connecting a test component in parallel with a capacitor 3 When replacing parts or circuit boards clamp the lead wires around the unit before soldering 4 When replacing a high wattage resistor gt 0 5W metal oxide film resistor in the circuit board keep the resistor about 1 cm 1 2 inch away from the circuit board 5 Keep wires away from the high voltage or high temperature components 6 Keep wires in their original positions so as to minimize interference 7 Always connect a test instrument s ground lead to the instrument chassis ground before connecting the positive lead always remove the instrument s ground lead last SPECIFICATION Monitor Specifications N0701 Monitor Notes Picture Tube Diagonal 43cm 17inch 90 deflection 0 28mm grille pitch medium Viewable Image Size 40 6cm 16 0inch short persistence phosphor aperture grille CRT Radius 1210mm multi layered anti static screen coating dark screen Inp
92. i D SUB 15P 6 REDGROUND BLUEGROUND CONTROLS SELECT To display OSM windows mode changes or activate the degaussing or OSM window color selection CONTROL BUTTON Without OSM Adjust the contrast With OSM Select icon and adjust RESET Return the adjustment item to the factory setting Power indicator LED The LED indicate Power management state amp POWER SWITCH Push push to turn the monitor on and off Power input To connect with the power cord Signal input with the captive cable To connect with personal computers analogue RGB output MultiSync V720 MultiSync V721 Diamand 5 71 OSD OPERATION FUNCTION VALUE ADJUSTMENT If OSD off press UP key to increase Contrast value press DOWN key to decrease Contrast value press SELECT key to display OSD and Brightness icon is active Fig 1 Fig 1 Press UP key or DOWN key to select icon right or left and the selected icon display red color If selected icon is DAC out press SELECT key will display DAC value bar fig 2 Fig 2 User can press UP key or DOWN key to adjust DAC value Press SELECT k
93. illator 14 channels 8 bit 62 5kHz PWM outputs 8 open drain outputs 8 6 CMOS outputs Sync signal processor with H V separation frequency calculation H V polarity detection control Three free running sync signal outputs for burn in test 64 62 5 48kHz 75Hz 31kHz 60Hz Self test pattern generator generates cross hatch picture DDC interface supports VESA DDC1 DDC2B standard Master slave interface Watch dog timer 0 524 second Maximum 25 programmable pins One 8 bit programmable timer Two 4 bit A D converter One external interrupt request Built in low voltage reset 5V power supply PIN ASSIGNMENT 40 Pin 42 Pin SDIP DA2 1 VSYNC Da2 gi VSYNC DA Cle HSYNC DA1 C2 HSYNC DAO DA3 DAO RESET C14 DAA RESET 14 DA4 VDD 145 DA5 VDD 515 DA5 H6 DA6 NC 6 osco 17 DAT C17 DAG OSCI 8 PA7 HSO osco o 8 DA7 PB5 SDA2 19 PA6 VSO OSCI C9 PA7 HSO PBA SCL2 3 10 PA5 DA13 PB5 SDA2 C 10 PAG VSO PB3 PAT 11 6016 PA4 DA12 PB4 ScL2c 11 WT6016 PA5 DA13 PB2 12 PA3 DA11 PB3 PAT E 12 PA4 DA12 13 PA2 DA10 2 13 11 PBO C114 PA1 DAQ PB1 114 PA2 DA10 PB6 IRQ 15 PA0 DA8 C1 15 DA1 DA9 PC7 C116 SCL1 PD0 6 E 16 PA0 DA8 PC6 E 17 SDA1 PDO 17 SCL1 PD0 PC5 18 PCO ADO PC6 18 SDA1 PD1 19 1 1 Pcs 0 19 PCO ADO 120 PC2 20 1 1 is a trademark o
94. ing circuit consists of the PTC thermistor TH102 the degaussing coil and the relay RL101 The relay is controlled by means of the 12V control signal coming from the CPU Transformer and energy induction 1 When the PWM controls KA3842A chip a driving pulse is generated at the gate of the transistor Q101 and Q101 turns ON The current returns from the plus side of the energy supplying ca pacitor C105 to the minus side of the same capacitor C105 passing through the transformer Q101 D S During the ON cycle the energy is stored in the transformer T101 The transistor Q101 turns OFF when the driving pulse disappears from Q101 As a result all voltages of the dot ends of the winding flow to the positive direction and reach the fly back rectifier At that point of time the diodes of the rectifier of the secondary side turn ON a temporary energy is induced at the secondary side and the ON cycle of the driving pulse is repeated 40 2 The power supply 5 FET 101 carries out the ON OFF operation of the control unit means of U101 KA3842A KA3842A is a PWM pulse width modulation IC chip with 16 V starting voltage and 10 V cut off voltage The following list shows the pin layout of KA3842A pulse width modulation IC chip Pin 1 Feedback Pin 2 Compensation Pin 3 Current sensor Pin 4 Oscillator Pin 5 Ground GND Pin 6 Pulse output Pin 7 VCC Pin 8 VREF 5 1 V 3 Overcurrent protection R111 is a sensor re
95. l base into the six holes at the bottom of the MultiSync monitor e Then slide the tilt swivel base forward e Then the latch above the tilt swivel base engages it is sare Removing Please removing the tilt swivel base when transporting for repair e Push down the latch of the MultiSync monitor and pull out the tilt swivel base Slide backward the tilt swivel base from the front of the MultiSync monitor e Pull out the tilt swivel base from the holes of the MultiSync monitor 13 Cabinet Back Cabinet Back 1 Turn the monitor CRT face down on a clean static free surface to prevent scratching CRT face 2 Remove the screw b 3 Raise the signal cable vicinity of a cabinet back and lightly hit part figure 1 reference of a top of the cabinet back and remove the cabinet back Screw b Cabinet Back Hitting Position Fig 1 14 MAIN BOARD BOARD CRT BOARD ASSY MAIN BOARD ASSY CRT 15 Unsolder the GND wire from MAIN BOARD ASSY Disconnect the connector P201 P202 5204 and S205 from the CRT BOARD ASSY Disconnect the CRT BOARD ASSY from the CRT Disconnect the connector S301 and P102 from the MAIN BOARD ASSY Remove the Anode Cap from the CRT NOTE Carefully discharge the CRT anode by shorting it to ground before removing Anode Cap Lift up the MAIN BOARD ASSY from the Cabinet Front ASSY ADJUSTMEN
96. mplitude and polarity of the parabola is controlled by E W PIN CNTRL PIN 10 both in the DC control mode E W PIN CNTRL Pin 10 This is the E W direction pincushion deformation control function and the voltage range is within the OV 4V range When the voltage falls within the 2V 4V range the amplitude increases and the parabola becomes positive On the other hand when the voltage falls within the 2V 0V range the parabola be comes negative TRAP CNTRL Pin 11 This is the trapezoid control function and the voltage is within the 0V 4V range When the voltage falls within the 2V 4V range the amplitude increases and the ramp becomes positive On the other hand when the voltage falls within the OV 2V range the ramp becomes negative Parallelogram control Pin 12 The voltage is within the OV to range When the voltage falls within the 2V 4V range the ramp the ramp becomes positive One the other hand when the voltage falls within the OV 2V range the ramp becomes negative 10 Bow shape control Pin 13 The voltage is within the 0V 4V range When the voltage falls within the 2V 4V range the parabola becomes positive On the other hand when the voltage falls within the 0V 2V range the parabola be comes negative 60 11 Output of the parabola bow shaped parabola Pin 14 The amplitude and the polarity of the ramp signal are controlled by means of the PARA CNTRL Pin 12 and the amplitude and polarity o
97. nnect a 1500 ohms 10 watt resistor paralleled by a 0 15uF AC capacitor in series with all ex posed metal cabinet parts and a known earth ground such as electrical conduct or electrical ground connected to earth ground as shown in the Figure 1 1 Measure the AC voltage across the combi nation of resistor and capacitor Figure 1 1 Set Up For AC Leakage Current Check To exposed metal Cabinet part To known Earth ground 1500 ohm 10 watt 1 Reverse the AC plug at the AC outlet and repeat the steps for measurements for each exposed metal part d Voltage reading must not exceed 0 3 volts RMS equivalent to 0 2 milliampere AC Any value ex ceeding this limits ill constitute a potential shock hazard and must be corrected immediately 1 1 3 Product Safety Notices Many electrical and mechanical parts in this chassis have special safety related characteristics which are often not evident from visual inspection The protection afforded by them may not be obtained by replac ing them with components rated for higher voltage wattage etc Before replacing any of these components consult the Recommended Spare Parts List given at the end of this manual Any of the replacements that do not provide the same safety characteristics may result in shock fire X ray emission or other hazards 1 2 Servicing Precautions Warning An electrolytic capacitor installed with the wrong polarity might explode Caution Before performin
98. ondition When it is in DDC2B state the VSYNC clock is disregarded and the communication protocol follows the DDC standard The data format on SDA pin is 5 Address IR W A D7 D6 DO A D7 D6 DO A P S Start condition falling edge occurs when SCL is high level P Stop condition rising edge occurs when SCL is high level A Acknowledge bit 0 means acknowledge and 1 means non ackonwledge Address 7 bit device address R W Read Write control bit 1 is read and 0 is write D7 D6 DO data byte The hardware operations in DDC2B state are 1 START STOP detection When the START condition is detected the DDC interface Is enabled and set START bit to 1 When the STOP condition is detected the DDC interface is disabled set STOP bit to 1 and generate INTO interrupt The START bit is cleared when the following data byte received The STOP bit is cleared after writing REG 19H 2 Address Recognition It contains two device addresses in WT6018 On fixed address 1010000 is for EDID reading and one programmable address REG 19H is for external control such as auto alignment If the address is equal to 1010000 set ADDR bit to 0 If the address is equal to the bit A6 to bit AO REG 19H set ADDR bit to 1 If the address is not equal to anyone above the DDC interface will not response acknowledge The ADDR bit is update
99. ontal driving circuit and the transistor Q1 generates a horizontal output through the driving signal IB1 lopmax Q1 1 1031 di dt 03 3 A us 2 The resistor R2 corrects the current IB1 the resistor R3 works as a damping resistor and leak resistor and the diode D2 works as a discharging device and polar body As long as the transistor Q1 is OFF the discharge is accelerated and the storage time Tstg is shortened 3 H OUT circuit waveform a Time 5uS div 62 7 Horizontal amplitude control Circuit Diagram R1 C1 DC L VW H Width 9 D1 CT gt cs A c 3 Lm Csm Description of the circuit 1 The diodes D1 and D2 compose the bipolar modulation circuit and have the function of controlling the currents of the oils DY Ipp and Lm Im through voltage modulation carried out by utilizing VM B Vm Vcs Therefore Vos ly Ly ts ly Vos ts Ly with B fixed Such being the case the horizontal width decreases when Vm gt Inversely the horizontal width decreases when Vm L Ves T gt ly T B Vp 2Tr t Ts Tr LyCt Tm LmCm 2 Q2 Q3 Q4 and U1 compose the control circuit of H WIDTH Of those devices the transistor Q1 and Q2 compose the Darlington current amplifier and on the other hand the transistor Q4 and the opera tional amplifier U1 compose the emitter coupled circuit that s
100. pin 7 of the power supply transformer That voltage is connected with the pin 3 of the IC chip U101 by passing through D108 C113 and passing next through R122 VR101 and R120 This is a regular loop 7 Snubber circuit The snubber circuit has the function of clamping the ON OFF spikes of the power supply MOS FET and its component elements D105 C106 R106 make up a snubber that turns OFF the power supply MOS FET 8 Secondary rectifier and smoothing rectifier The secondary rectifier is a harmonic rectifier consisting of D111 C124 and R128 and it works as a snubber circuit as well The capacitors C120 and C138 are the smoothing rectifier working on the 45 Volt DC output There are also other DC outputs such as 80 Volt D110 13 5 Volt D112 and 6 3 Volt D113 41 Power saving Suspend mode Every DC voltage operation of the CRT is turned OFF The color of the power LED101 switches from green to orange OFF mode This is the mode in which the CPU control unit turns OFF the power supply but the power turns ON when the user touches the keyboard The power LED switches to dark orange color 1 When the power switch is turned ON when there is nothing being entered in the video cable At that time if the video is shifted from the free run mode to the suspend mode the transistor Q107 turns OFF and the operation returns to the OFF mode within a few seconds 2 As for the sequence of steps that turn the operation to the OFF mode if the
101. rol set to Max Contrast Control set to Max Adjust gain control to Y 42FL 144 cd m2 2 Change Pattern to Full White Brightness control set to Min 3 Adjust R gain control B gain control to 300 Y 315 at the contrast control is adjusted 15FL 52cd m2 3 6500K Select the color Mode 6500K 1 50 50mm Green block Pattern Brightness Control set to Max Contrast Control set to Max Adjust gain control to Y 39FL 134 cd m2 2 Change Pattern to Full White Brightness control set to Min 3 Adjust R gain control B gain control to X 315 Y 325 at the contrast control is adjusted 15FL 52cd m2 D Maximum brightness Adjustment 1 Brightness control set to Max contrast control set to Max 2 Adjust VR306 to Y 31FL 105cd m2 11 Focus Adjustment A Mode No 16 B Pattern Full o 4dots hole Pattern Brightness just cut off Contrast maximum C Adjust Focus VR that o mark shall be clearly at 1 4 poit of the diagonal line 12 Convergence Adjust A Mode No 12 B Pattern Crosshatch C Use the convergence meter to check whether the convergence is within spec Adjust the CPC Magnet to make the convergence within spec 19 13 Power Saving Function Inspection A Mode No 12 B Pattern Any Pattern C Inspection 1 It should be into power off Mode when the both horizontal sync and vertical sync are disable after 4 sec Check the LED color Orange and the power consumption must be le
102. s s MAIN BOARD 040103 CARBON 1 8W T 5 10Kohm 1 sm s 21 5 7 ME 611 BOARD 240681 CARBON 1 4W T 5 680ohm 040223 CARBON 1 8W T 5 22Kohm 040472 CARBON 1 8W T 5 4 7 129 FA040223 CARBON 1 8W T 5 22Kohm R130 MAIN BOARD R0319110 JUMPER WIRE AI T 15mm MAIN BOARD FA040102 CARBON 1 8W T 5 1Kohm MAIN BOARD FA040330 CARBON 1 8W T 5 33ohm FA040102 CARBON 1 8W T 5 1Kohm FA240750 CARBON 1 4W T 5 75ohm MAIN BOARD FA040102 CARBON 1 8W T 5 1Kohm 612 MAIN BOARD MAIN BOARD MAIN BOARD 618 MAIN BOARD 619 MAIN BOARD MAIN BOARD MAIN BOARD 622 MAIN BOARD 623 MAIN BOARD 624 MAIN BOARD 625 MAIN BOARD FA040273 CARBON 1 8W 626 MAIN BOARD MAIN BOARD MAIN BOARD 629 MAIN BOARD MAIN BOARD 631 MAIN BOARD 63 FA330561 CARBON 1 2W T 5 5600hm FA040470 CARBON 1 8W T 5 47ohm FA040203 CARBON 1 8W T 5 20Kohm 040224 CARBON 1 8W T 5 220Kohm FA040102 CARBON 1 8W T 5 1Kohm T 5 27Kohm FA040222 CARBON 1 8W T 5 2 2Kohm FA040202 CARBON 1 8W T 5 2Kohm FA040472 CARBON 1 8W T 5 4 7Kohm FB241051 METAL 1 4W T 1 1 05Kohm FB246242 FA040332 CARBON 1 8W T 5 3 3Kohm 2
103. s of the programmable frequency ramming H VO dt C System Block Diagram DUTY CNTL X RAY SD Veo Tia VOLTAGE SEDRIVE REFERENCE Ts 5 PD2 FILTER FLYBACK PD1 FILTER VCO IN H HV POLARITY PHASE CNTL Typical Application LM1290 He POLARITY g s OUTPUT 20k 7 4704 W 1 14 J OF e Ver 3 MK POI ARITV PD1 FILTER 73 3k V p 3 ie 2217 ae DUTY C 9 4 cvcLE EM FILTER Gos i H PHASE s xray 1290 phase 10 gt T 15k CONTROL 01 T 6 FLYBACK fren M NZ V 7 H DRIVE GND Zik Voc zs L 1 7 ics OH DRIVE OUTPUT DUTY 5k 24 FLYBACK CYCLE PULSE IN CONTROL X RAY PROTECTION 57 1 PIN 1 fmin lower limit frequency of this setting fmin 5 6 108 Rmin 500 fmin 29 1 kHz Rmin 18 7KQ When the frequency is 30kHz or more fmin 22 8 kHz Rmin 24KQ When the frequency is 24kHz or more 2 PIN 2 Polarity of H HV 0 1uf lo 1uA Vo 1 e t RC 3 H HV synchronous input When there is compatibility between TTL and CMOS the H HV synchronous input is within the 0 35 to 1 85 V range and the polarity is negative 4 Power factor control V
104. sistor and it has the function of increasing the current of this loop when the output of the secondary side is either in the overloaded state or is insufficient Since the current passing through the R111 sensor resistor has voltage dropping effect the opera tion of the output pulse is stopped when a voltage lower than 1 Volt is detected at the pin number 3 of the KA3842A 3chip and the switch of the power supply MOS FET is kept in the break state until the VCC voltage is charged up to 16 Volts and the operation of U101 KA3842A is resumed When it is not clearly known whether there is voltage shortage or not however this circuit repeats the ON OFF switching and the power supply LED lights up 4 Starting circuit The resistor R123 and R148 and the transistor Q112 and diode D119 and resistor R131 R149 and zener diode ZD105 are for the starting operation When the circuit starts its operation the power supply transformer T101 supplies the auxiliary 12 Volt power to the control IC chip U101 via pins 6 and 7 of the winding transformer T101 5 Synchronization circuit The synchronization signal is induced from the fly back transformer FBT and carries out the synchronization with the power supply frequency The frequency range is from 31 kHz to 70 kHz and the component elements of the synchronization circuit are C114 R116 D109 R115 and R117 6 Feedback circuit The feedback circuit loop induces the 12 V voltage through the pin 6 and the
105. ss then 5W 2 The picture should be recovered readable within 3 seconds when the both horizontal sync and vertical sync are enable Check the LED color Green 14 Geometry Adjustment Factory Auto Alignment A Enter to the Factory Mode B Adjust H size V size H phase V phase Pincushion and Trapezoid for all preset signals C Adjustment data are automatically stored into the factory preset memory after 1 sec Note for the factory auto alignment Mode No 2 3 7 9 10 11 12 14 15 16 17 18 19 20 shall be adjusted Other modes can be used the calculated average value 15 DDC 1 2B Writing and Inspection A Mode Any Mode Pattern Any Pattern B Connect the MICON Tech DDC Read Write System C Scan bar code label and apply serial NO to EDID Data 16 Setting Before Shipment Color Temp 9300K OSD Back Ground Blue OSD Position Center of the screen Contrast Maximum Brightness Preset Background should be disappeared Self test pattern Crosshatch Select the P2 in the Factory Mode 17 Adjustment Magnetic Field A For Northern Hemisphere Model Vertical 40uT Horizontal 0uT Neutral B For Southern Hemisphere Model Vertical 40uT Horizontal OuT Neutral 20 18 TIMING SHEET for N0501 N0701 PresetModoNo 1 2 s 4 s e Signal Name VGA350 VGA400 VGA480 MACII 800 600 8514 A 35K 56 XGA ot uS Disp dot 640 640 640 640 800 1024 uS 25 42 25 42
106. t register to data buffer INTO DDC2B 1 DDC2B 1 DDC2B 1 DDC2B 1 ADDR 0 ADDR 0 ADDR 0 ADDR 0 R W 0 R W 0 R W 0 R W 0 START 1 START 0 START 0 START 0 STOP 0 STOP 0 STOP 0 STOP 1 DDC2B state write timing Pull low SCL Pull low SCL SCL UU UL SDA ___ I5 N A Data Byt Data Byt Out ata Byte ata Byte Write REG 19H to release Data buffer to shift reg Y DDC2B 1 DDC2B 1 DDC2B 1 ADDR 0 ADDR 0 ADDR 0 R W 1 R W 1 R W 1 START 1 START 0 START 0 STOP 0 STOP 0 STOP 1 DDC2B state write timing 55 3 2 wire serial CMOS Features e Low Voltage and Standard Voltage Operation 5 1 Vcc 4 5 V to 5 5 V 3 0 Vcc 2 7 V to 5 5 V 2 5 Vcc 2 5 V to 5 5 V 2 0 Vcc 1 8 V to 5 5 V Internally Organized 128 x 8 1K 256 x 8 2K 512 x 8 4K 1024 x 8 8K 2048 x 8 16K Two wire Serial Interface Bidirectional Data Transfer Protocol Wire Protect Pin for Hardware Data Protection Eight byte Page 1K 2K 16 byte Page 4K 8K 16K Write Modes Partial Page Write Cycle 10 ms max High Reliability Endurance 100 00 Cycles Extended Endurance Devices Available Data Retention 100 years e Automotive Grade and Extended Temperature Device Available e Eight Pin and 14 JEDEC SOIC and Eight Pin PDIP Packages Description The 24 01 02 04 08 16 provides 1024 2
107. tabilize the voltage and control the current 3 The horizontal width broadens when Va T gt vbl T 5 11 T 12 T 5 Vm J An inference the opposite sense is also possible Test points for maintenance 1 C 31 to 37 kHz 3 2 us 48 to 64 kHz 3 0 us 2 8 us 2 V CENTER 31 to 64 kHz 101 91 to 4 06V V CENTER 31 to 64 kHz 1011 6 to 27 4V 63 8 Blanking and spot killer Circuit Diagram 9 gt A CN V SYNC 7 R7 MUTE P A O Di Q gt l Bi Ng Ri N D6 R8 D1 d Et V OUT lt R2 lt 5 i WV a v2 BRIGHT D5 2 201 4 03 4 lt CONTER E lt VE 777 Description of the circuit 1 The vertical blanking circuit completes by Q1 Q2 Q3 and peripheral circuit The vertical sync pulse applied to R3 R12 connected to Q5 base Q5 is invert amplifier then mixer with Q1 base together for compensate vertical retrace time of the blanking pulse 2 The vertical amplifier output waveform through D1 C2 R1 R2 make waveform forming and clamp Then applied to Q1 base the vertical blanking amplifier of the Q1 the output connected to buffer Q2 through C3 coupling to G1 control circuit D4 D5 for over voltage protect 3 The Q is spot killer protect circuit in normal power on stage V1 V2 and 201 so Q6 off The CRT G1 voltage is fixed
108. tions The con OV to input range tains three high input impedance wide band amplifiers m Stable with 0 20 pF capacitive loads and inductive which directly drive the RGB cathodes of a CRT Each chan peaking networks nel has its gain internally set to 14 and can drive CRT ca m Convenient 220 staggered lead package style pacitive loads as well as resistive loads present in other ap amp Standard LM243X Family Pinout which is designed for plications limited only by the package s power dissipation easy PCB layout The IC is packaged in an industry standard 9 lead TO 220 molded plastic power package See Thermal Considerations Applicati ons section 4 m 1024 x 768 displays to 60 Hz refresh m Pixel clock frequencies up to 60 MHz m Monitors using video blanking Schematic and Connection Diagrams LHD Pin 1 Designator 05101043 2 Note Tab is at GND Top View Order Number LM2438T FIGURE 1 Simplified Schematic Diagram One Channel 1999 National Semiconductor Corporation DS101043 www national com 67 Theory of Operation LM2438 is high voltage monolithic three channel CRT driver suitable for high resolution display applications The LM2438 operates with 80V and 12V power supplies The part is housed in the industry standard 9 lead TO 220 molded plastic power package The circuit diagram of th
109. tterproof goggles Try to keep the CRT away from the body during handling High voltage should always be kept at the rated value no higher Only when high voltage is excessive are X rays capable of penetrating the shell of the CRT Operation at high voltages may also cause failure of the CRT or high voltage circuitry The CRT is especially constructed to limit X ray emission to 0 5mR HR at 300 microamperes anode current To ensure continued X ray protection replace the CRT with only the same or equivalent type as the original and adjust the anode s voltage to the designated maximum rating never to exceed 1 1 2 Safety Checks Before returning the monitor to the user perform the following safety checks 1 Inspect to make certain that each lead dress is not pinched or that hardware is not lodged between the chassis and other metal parts in the monitor Inspect all protective devices such as nonmetallic control knobs insulating materials cabinet backs adjustment and compartment covers or shields isolation resistor capacitor networks mechanical insulators etc AC Leakage Current Check Always perform the AC Leakage Current Check on the exposed metal parts including metal cabinets screwheads and control shafts as follows a Plug the AC line cord directly into a rated AC outlet Do not use an isolation transformer during the check b Use an AC voltmeter with at least 5000 ohms per volt sensitivity as follows Co
110. unter overflowed the OVF1 bit will be set to 1 The counter keeps on counting until it overflowed again The OVF2 bit and FRDY bit will be set when counter overflowed twice This is designed for finding the vertical frequency bellows 15 25Hz The program should check REG before reading REG 16H Polarity Detect Control The polarities of HSYNC and VSYNC are automatically detected and are shown in the H POL and V POL bits The polarities of HSO and VSO are controlled by the HOP and VOP bits For example set HOP bit to 1 the HSO pin always outputs positive horizontal sync signal whatever the HSYNC input s polarity is Free running Sync Signal The self generated sync signals are output from HSO and VSO pins if SELF bit is 1 Three kinds of frequencies are provided 1 Hfreq 8MHz 125 64 0kHz Vfreq Hfreg 1024 62 5Hz 2 Hfreq 8MHz 167 47 9kHz Vfreq Hfreq 640 74 9Hz 3 Hfreq 8MHz 257 31 1kHz Vfreq Hfreq 512 60 8Hz The output polarities are controlled by the HOP and VOP bits The pulse width of HSO is 2us and VSO is four HSO cycles The timing relationship is shown in the following 2us HSO MESS VSO 50 Test Pattern Generation A self test pattern signal comes out from pin PB3 PAT It can generate a cross hatch picture a inverted cross hatch picture a whit epicture or a black picture 8 x 8 cross hatch Inverted 8 x 8 cross hatch
111. urrent is 5mA 15 16 PB6 IRQ Port or Interrupt Request When as interrupt request input it has an internal pull high resistor When as an port it is same as 16 17 7 Port C7 When it is an input pin it has an internal pull up resistor When it is output pin the sink current is 10mA and the source current is 5mA 17 18 PC6 lO Port Same as 18 19 PC5 lO Port C5 Same as 19 20 PC4 lO Port C4 Same as 20 21 Same as 7 21 22 2 lO Port C2 Same 22 23 PC1 AD1 Port C1 or A D converter input 0 23 24 PCO ADO Port CO or A D converter input 1 24 25 SDA1 PD1 DDC serial clock or I O Port D1 When it is DDC interface pin It is an drain output When as port it is same as Port B 25 26 SCLIIPD0 DDC serial clock or I O Port DO When it is a DDC interface pin It is an open drain output When as an port it is same as Port B 26 27 PA0 DA8 I O Port AO or D A converter 8 This can be the output of D A converter 8 source sink 5mA or an I O pin source 100uA sink 5mA 27 28 PA1 DA9 lO Port A1 or D A converter 9 Same as 28 29 PA2 DA10 lO Port A2 or D A converter 10 Same as 29 30 PAS DA11 lO Port or D A converter 11 Same as
112. ut Signal Video ANALOG 0 7Vp p 75 Ohms Sync Separate sync TTL Level Horizontal sync Positive Negative Vertical sync Positive Negative Display Colors Analog input Unlimited number of Colors Depends on display card used Synchronization Horizontal 31 kHz to 70 kHz Automatically Range Vertical 55 Hz to 120 Hz Automatically Resolutions Supported Resolution based on horizontal and vertical frequencies only 640 x 480 60 to 120 Hz 800 x 600 55 to 110 Hz 832 x 624 55 to 106 Hz 1024 x 768 55 to 87 Hz 1152 x 870 55 to 77 Hz 1280 x 1024 55 to 66 Hz Some systems may not support all modes listed NEC cites recommended resolution at 85 Hz for optimal display performance Active Display Area Horizontal 310mm Dependent upon signal timing used Factory Setting Vertical 232mm and does not include border area Active Display Area 325mm Dependent upon signal timing used Full Scan 243mm and does not include border area Power Supply AC 100 240V 50 60Hz Current Rating 1 5A 100 240V Dimensions 403 W x 420 H x 418 D mm Weight Net 15 5 kg Environmental Considerations Operating Temperature Humidity Altitude Storage Temperature Humidity Altitude 0 C to 35 C 30 to 80 0 to 3000 m 20 C to 60 C 10 to 90 0 to 13700 NOTE Technical specifications are subject to change without notice ASSIGNMENT Min
113. y character color selection Maximum 8 color selectable per display row Double character height and or width control Programmable positioning for display screen center Bordering and shadowing effect for display Programmable vertical character height 18 to 71 lines for multi sync operation e 4 programmable background windows with multi level windowing effect GENERAL DESCRIPTION Software clear function for display frame buffer Hsync and Vsync input polarity selectable Auto detection for input edge distortion between Hsync and Vsync inputs Half tone and fast blanking output Software force blank function for display frame Compatible with both SPI bus and interface through pin selection 16 pins PDIP package MTV016 is designed for use in monitor applications to display the built in characters or symbols onto monitor screen The display operation is by transferring data and control information in micro controller to RAM through a serial data interface It can execute full screen display automatically and specific functions such as character bordering shadowing double height and width font by font color control frame positioning frame size control by character height and horizontal display resolution and windowing effect BLOCK DIAGRAM VDO SSB 4 DATA DATA cose a D gt SERIAL DATA OL vss W INTERFACE lt REGISTERS 1 SDA
114. yte from data buffer REG 18H After loading data to the shift register the data buffer becomes empty and generates and INTO interrupt So the program must write one data byte into REG 18 every nine VSYNC clocks Since the default values of data buffer REG 22 and shift register are FFH the SDA pin outputs high level if no data had been written into data buffer after power on reset When program finished initialization and set the IEN_D bit to 1 the INTO will occur because the data buffer is empty The INTO service routine should check the DDC2B bit is 0 and then writes the first EDID data byte into data buffer When the second INTO occurs the INTO service routine writes the second EDID data byte into data buffer and so on SDA X Bite X Bit5 X Bit4 X X Bit2 X Bit gt VSYNC 2 ob gl 10 18 19 Load data to shift register INTO IEN D 52 If a low level occurs on the SCL pin in DDC state the DDC interface will switch to DDC2B state immediately and set the DDC2B bit to 1 No interrupt will be generated But if there is no valid device address and it receives 128 VSYNC pulses while the SCL is high level it will lock into DDC2B state and disregard VSYNC In some case program wants to go back DDC1 state set RDDC bit in REG 1AH and reset it again This operation resets the DDC interface to the initial c

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