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HP L1940T NT68663MEFG A02

1. en mess Lame mee RST CHPROOHM eene Caz wienn 1 RST 10 OHM 5 1 10W RST 10 5 1 10W RST 100 5 1 10W RST CHIPR 100 OHM 5 1 10W RST CHIPR 100 5 1 10W RST 100 5 1 10W 38 19 LCD Color Monitor L1940T INTERNI TRI CTE Tee RST ONR 100 OMe n em sem Trooz ow Cass sem Ooo mes erann row mes erann mem e eeng ease en eem Lame sem Trooz wies Lans mes Don 0 senn mw en sem Trooz en wiewens ease Tee Ooo n Lame mem Don Lum mes Daou sem raumen een RST CHR en eeng asr era es ou Tee 1 Lamm mes RST GMPR oroms now mes RST GMPRToKOHM S now ep wies er Tee 1 en Teen en Tee 1 Lame mes RST OMPR oroms now mes en sem raumen ssor eem om Teen
2. conn R232 U201A U201B R233 100 1 16W 0 1716W HS 1 2 3 4 20207 R234 231 74LVC14APW 74LVC14APW 22K 1 16 N 3pF n ko kos GND GND R239 R240 100 116W 0 1 46W vs 41 10 Sue 20208 R243 74LVC14APW 74LVC14APW S 22K 1 16 N C234 a 220pF GND 24 3 A0 5 WP A1 SCLK A2 SDA GND 3 3 3 3 3 3 715G U201F 13 12 x 74LVC14APW Document Number ate Friday May 05 2006 Signal Input 2 of 5 HP L1940T FB302 112 120 3 3V 120 OHM ADC_VAA C302 C303 C304 10uF 16V 0 tuF 0 1uF FB303 3 3V d pe 3 3VDD i 120 OHM i 2 C305 C306 C307 2 10uF 16V 0 1uF 0 1uF 2 FB301 99 108 3 3V RR AUT AVCC C310 0 1uF 2 2 FB304 119 a ENAT DVI_PVCC 0 1uF FB305 14 89 1 8VCC 1 8VDD C312 C313 C314 10uF 16V 0 tuF 0 1uF FB307 oo 3 3V VDD 2 2 2 MCU VDD 2 2 2 C31 2 0 1uF R320 R321 5 R322 NC lt 47K U302 1 2 de Ka 24C16 WP 3 NEM 16CSCL 1256 VSS SDA 6 IICSDA M24C16 WBN6 Nas 100 1 16 8P DIP TYPE Es w SOCKET NC MCU VDD C326 U303 M24C16 MN6T 1 8 VCC 7 24016 A1 WP LE 16CSCL 2142 SES 16CSDA MCU_VDD CN303 CN304
3. Li uns 4 24C16 WP 2 IDX 4 gt gt LED_R 4 2 1 8VDD 3 3VDD D gt LED_G 4 2 lt VGA_CABLE 2 100 1 16W C319 Ref Des Reserved 705 12 01 R3 gt gt PANEL 4 Ch 10 1412 242202505572 ange from portl to por 100 lt lt 2 60952 M 2408 222224119876 C320 200 2422 222224119876 lt lt DVI SDA 2 105 7402 319801070490 0 1uF 3 3VDD amp DVI SCL 2 TL431ACD 2307 223878615649 C323 C321 C32 lt KISPSDA 2 100n 231 223878615649 122 3 3pF XISPSCL 2 3 10uF 16V 3304 212211805669 10K BRIGHTNESS 4 R329 5 R330 5 R331 R332 C324 333 4 2 gt 3311 232210260103 100 V TH6W lt A A A A 10K 325 E e za 470uF 16V 100pF 6 o o o 1K OHM MCU_VDD 200605043 47 183392739 LAimprovedA tissue 1 8VCC Ty Title 3s 11940 GND Size Document Number ev Custom NT68663 MCU SCALER B ate Friday May 05 2006 heet 3 of 5 25 26 HP L1940T RAO S 3 BRIGHTNESS BRIGHTNESS 3 CN401 a a BL CONTROL CONTROL 3 12V USB_ 5V 7 8 T 9 411 412 C409 10 11 gt u 0 1u 4TuF 16V 12 13 403 14 wu 120 414 415 413 0 1u 0 1u ATuF 16V CONNECTOR FOR zi TT POWER INVERTER BOARD 2 0 mm 5
4. om CHPTACTSMTCHHeTS 1609 SKOGABEDIO _ mg 1 __ _ 7mm oras ro iro e ro __ ro rosa mm ore 14500K EDVSSMKAAASENSGOWEUR mss _ Em __ _ e 46 19 LCD Color Monitor L1940T jamersoosoozie ooo ooo Longen oo oso R oss v s Lo ame oso s028 r Lo Law ooo e _ onsker ALUMINUMFOL Towne se1620358 PNUABELFORMANUALPEBAG OOOO _ Romar uge Joss we we _ me emm remm eowercono nem em mamen Jens CONVERSION BOARD pm EE EE mm ee 085658369 I GASKETALUMINIUMFOIL 0560 U401 562117 LHPND09GKQ1 IC NT68663MEFG 128 QFP 128L 0502 056G1133520CH3 AT25040AN 10SU 2 7ATMEL AT25040AN 10SU 2 7 ATMEL 47 19 LCD Color Monitor L1940T Lue Pete CR eme men L Eus eso SGNALCREDSUSCEREGOUEFUL mm eme frecce ewon ee
5. mw uecom 2nd 1602 088 351 2 USB CONN source USGEWRAX 0 ment psum ee 24 CONN ATTACHED SCREW 1201 0886 35424 N DVI 24PIN CONN 22 source soc DVI H24P F 191DVIDY wes e La Leem roson Iesse 37 19 LCD Color Monitor L1940T CREIER mes Dore n sessar GAGHVAWPTRRSONR o wiesen wacom wines wacom Lm Terme ooo n en wsackum wssackust Teams 0 Lm GSNMWCHAPHRTSSORRRTI e e eame T maso wie mor WASGSUWUNERNONSER Teens maPDMEKSOS MURS Ims emer oreren ret Lamm ee mei uio eme 1 eene e Teen RSTONPROOHM 1 mem ease mem RST MPR orm s snow mem ease en Teens RSTONPROOHM Su vow Lame Teen oo Teen 1 Lamm mem ease mem
6. EE PANEL LCD 19 ME13 16 REV 2 D HSD mamen PANEL HSDTOOMETSAIGREVANIHSO ssec CONVERSION BOARD ciesa ees eem _ cazi a1 camer aarr po ooo eem rose our een 1 LOW E S R 470UF 20 16V emmmer Lesen mwer 0560 0401 IC NT68663MEFG 128 QFP 128L 562117 LHPNDO9HKQ1 0502 056G1133520CH3 IC AT25040AN 10SU 2 7 ATMEL Diversity of T981KMNDBHHPQP compared with T981KMNDKHHPQP rem PartNo 041G7800690A16 QSG FOR EUR E089B 089G 718WAADP1 CORD SUB D 15 1M8 SUB D 15 E089A 089G404A19N IS POWER CORD E089A 089G404A19N LS POWER CORD Q41G160069041C L1940T DOC KIT EUR 48 19 LCD Color Monitor L1940T 20898 089G 718 1 2nd source E089 089G179E30H712 2nd source 089 089G179J30H712 PANEL LCD 19 ME13 16 REV 2 D HSD LE 7 PANEL we REV2NIWGD _ mme CONVERSION BOARD raze etate sen GaPcER saprsovswrosos won Powe eono etaar eem Low eessen eowec C907 067G215Z10115K ELCAP 100UF M 450V 0401 056G 562117 LHPNDO9HKQ1 IC NT68663MEFG 128 QFP 128L Paner _____ CONVERSION BOARD
7. O USB3V3 lt Title gt USB HUB 200WP7 Document Number Date Friday May 05 2006 Sheet 28 9 2 Power Board include inverter and power Inverter Schematic Philips HPL1940T L1740 PCB 715G1821 1 715G1995 1 801 7 s 1 CN831 7 _ SpF 3KV R834 OP1 2 12 3 6 2M 1 2W NC CONN VDD 3 C803 val A 1 4 C801 5pF 3KV R835 10pF 6KV y 1 R831 C820 C821 2 R822 R823 5 8 1 VDD 470uF 25V 1uF 10R 10R 6 R824 a ka C838 811 24 24 2400 1000pF 7 5K 196 1uF T TF N 10K_1 D833 D831 R804 a a gor OW a a BAV70 SOT23B BANOO R803 C822 C823 m 0 001uF 0 001uF R837 C860 10K NC S 7 5 _1 220 3 R601 pus R811 R813 R829 i gt 3M3 33K_1 10 Q801 e 0 1 10 2 1 1 2N7002 R833 BRIGHTNESSY 4 a 8 C805 R839 1 2 0811 _ 2 6 2 1 2wW R802 6 N ji 2 C804 109 ee i 11 DRvA penp 16 uu Cast 25 1 5 2 VDDA FE AMOJN 54 _ Slam 1E 1 PT802 SZ 807 N C813 5pF 3KV 1 560 806 62M NC SI D853 2 heat R806 a 2 VSEN 4 12VCC 3 10pF 6KV C808 BAV70 SOT23B CONN 100K NC 0 01uF NC W s C847 5pF 3KV R855 7 10 0 022uF 25V 1 OVPT ENA 840 841 5 8 R851 8 9 81 470uF 25V 557 10K_1 1K
8. nsure oz i6 em Imeuserz PSUOPENFRIPS ou 2nd 20958 0896 718RAADP1 CORD SUB D 15 1M8 15 D SUB BK Ed source 095 089G 718WAADP1 CORD SUB D 15 1M8 SUB D 15BK 089G179J 30713 FFFCSOPINP1 0 30PIN P1 0 E089A 089G404A19N IS POWER CORD source owonayarcms am s0 kou sr mono suo am ss Joen exo mmm wer 6120 9 oro e0 koyo eem suo screw meno euo am O ment CONROLEUNON escwm c mere 36 19 LCD Color Monitor L1940T EN IERI eessen Lesen eat Lane 1 ercon Le A wn 2 en mamen noon Pon 1 1 en on ore ost ox Pon non _ ELCAP KM 25VS 47U PM20 B 221 Cae Sorena an oo 1 s su mn nn mem
9. Ise 2 CER20609x7R Ise 2 oerzosoxmivioone Ise 2 e Jaen 12 oerzosoxmivioone am Jaen Laos see oo en Ise e Ise 2 en en Ise 2 CER20609x7R 16VI0ONP an Jens oerzosoxmivoone ze Ise sem 2 oo NR oscnenai0e 2 ememr Ise 2 CER20609x7R16VI0ONP Ise 2 CER2O0609x7R 16VI0ONP see messe zm Jaen oerzosoxmiwvoone zm oowowong messe za Ise 2 CER2O609x7R Ise 2 oerzosoxmivioone osowowo emma 2 CER20609x7R16VI0ONP Jaen oerzosoxmivoone zw see messe Ise 2 CER20609x7R 16VI0ONP somno oerzosoxmivioone somno oerzosoxmivioone see messe Ise 2 42 19 LCD Color Monitor L1940T osscnssioe noua users omnem GR CUN Lesen eener Lesen omnem vone sen Josee n om sen ser Josee e on seet ees e een en 0000000 en seen Teresa e seen none en messen en ms oss Lune seen Jemen EEC O seen O Lesen Ooo 0 1UF 10 25V X7R 080 221 0 1UF 10 25V X7R 080
10. 10 19 LCD Color Monitor 19401 4 2 Factory Preset Display Modes Format KHz Polarity Polarity MHz was __ sexe wem 950 VE __ sexe 3800 15 89 vesa a we T esx vea e sooxeo or 128 5000 vesa sme Sm s _ ow vesa e seem ____ 0 7500 vesa om wee eme 15 100000 mn 6 s 14 1280 x 1024 63 98 60 02 108 000 VESA 1280 x 1024 79 97 75 02 135 000 VESA 4 3 Power Supply Requirements AC Input Voltage 90 to 265V AC Input Frequency 47 to 63 Hz Inrush Current 50 MAX AT 220VAC and 30 AT 120VAC Leakage Current 5 mA MAX at 120VAC 11 19 LCD Color Monitor 5 Panel Specification 5 1 General Feature Wide viewing angle High contrast ratio Super fast response time High color saturation SXGA 1280 x 1024 pixels resolution DE Data Enable only mode LVDS Low Voltage Differential Signaling interface 5 Compliance ltem Specification Active Area 376 32 H x 301 056 19 0 diagonal ezel Opening Area 380 2 H x 305 river Element a si TFT active matrix ixel Number 1280 x R G B x 1024 Pitch 0 294 H x 0 294 V ixel Arrangement RGB vertical stripe isplay Colors 16 2M ransmissive Mode Normally White urfac
11. adjustment in Audio board Keyboard E Video signal AC IN HOST Computer 110V 240V 19 LCD Color Monitor L1940T 3 Operation Instructions 3 1 General Instructions Press the power button to turn the monitor on or off The other control buttons are located at front of the panel By changing these settings the picture can be adjusted to your personal performance power cord should be connected Connect the video cable from the monitor to the computer VGA card Press the power button to turn on the monitor the power indicator will light up to Green 3 2 Control Buttons Power Indicator Green Power On mode Orange Power Saving mode Blank Power Off Mode Auto Adjust Activates the auto adjustment feature for optimum image Menu Opens the ON Screen Display OSD menu Minus 1 If OSD is on press to navigate backward through the OSD menu features and decrease adjustment levels 2 If OSD is off press to enable the DVI signal input available on select models plus 1 If OSD is on press to navigate forward through the OSD menu features and increase adjustment levels 2 If OSD is off press to enable the VGA signal input Power Turns the monitor on or off 19 LCD Color Monitor L1940T 3 3 Adjust the Picture Main Menu Press the Menu button the Main Menu should be come on the screen of the monitor Main Menu Contrast Image Control Co
12. jan AN Pr ca y 2 A mm ai L 12802 ti 1915 m n 8888 715G1821 1 T3 15AH 250V AC 4871 gt mn E 901 acon gt 4 CAUTION FOR CONTINUED PROTECTION 4820 J amp 1E JBI AGAINST RISK OF FIRE REPLACE ONLY m WITH SAME AND RATING OF FUSE 2820 2 C840 E See S 5 i 5 f EI gt 28 P a iu S CAUTION HIGH VOLTAGE CAUTION HIGH VOLTAGE 2 m iq O 5 j 6 m 10 3 weu 715618551 mm 5 4 POWER 3 N m 2 4 18 18 E X N 0547 a lt o 32 19 LCD Color Monitor 11940 11 White Balance Luminance Adjustment Approximately 30 minutes should be allowed for warm up before proceeding White Balance adjustment 1 How to do the Chroma 7120 MEM Channel setting A Reference to chroma 7120 user guide Use SC key and NEXT key to modify xyY value and use ID key to modify the TEXT description Following is the procedure to do white balance adjust 2 Setting the color temp You want A 9300 color 9300 color temp parameter is x 283 20 y 297 20 Y 180 cd m B 6500K color 6500K color temp parameter is x 313420 329 20 Y 180 sRGB
13. 220PF 25V R955 4 7K 1 10W 30 HP L1940T R949 100 ZD949 RLZ12B_NC _NC O 12V 5VA 19 LCD Color Monitor L1940T 10 PCB Layout 10 1 Main Board CI PAW y d n CN502 is Bap LUCID toe 8072 07 15 2 C515C509C519 6516 gt b DOD NOD g _ TI 22 gt 1 82 1094 2159 C508C516 R522 R511 R507 2 E za 4 NO CI 98 E 508 6201 CI FB506 2507 7 202 20 _ 0203 22281501 ees gt CJ 6205 CIL FINO 5990 C510 GO R505 R210 _ C513 Sac 0204 C209D205 R515 3 __4 13 __47 202 JL FB202 da 41 nou 13 C308 04 mo C303 Clo Lco 0 03 vm N N La L ES gt gt 12166221 C J Cl m 82176222 __ R218C224 JOD eg 8 S9 R214 C218 R215C220 Ela AMAR U LIU c422 ZIR324 8888 LJ gt C323 ___ 405 A C421 06478 ___ SE C 6224 8004 O X La C234 C230 206 Y301 L _ 5 S gt S FB306 es peus E Re LI LU C R239 524 5 5 715G1864 1 VER B 31 19 LCD Color Monitor HP L1940T 10 2 Inverter Power Board 1561821 1 len LL 64951 C952 E 4952 pt No C955 8902 ar H Wa La T5A 250VAC F302 19
14. owowoxswc e 2nd source 2nd source 51 19 LCD Color Monitor L1940T E089B SIGNAL CABLE D SUB CABLE GOLDFULL 2nd source Ceos Toonase roce ANN Don G1864 1 X X 1 070122 mees carcen saprsovurosos regen POMERBONDGWELEXZGUEY Lum Iesse hose zur Non Pec ob our wae LOW E S R 470UF 20 16V Leem eem eme Ieren none 52
15. 00 sie sw eaveo iR Lum mx as seess Lum enn mososuemwe ER e enn uososwemmeeER Lem m nonw _ Lum wx seess Lum enn uososwemwe eR Lum enn mx wa uososwemwe wx seess m ws DIO SIG SM BAV99 x 45 19 LCD Color Monitor L1940T ooo J en ome en ome en ome en ex posesmeav ens sm ome sen use lesen use mere oo use 36225561 H CRYSTAL wsazmswec mamm os 32 _ wozss ooh wn 0096 225518 H CRYSTAL _ em osse oss exe men 5 mem ooo our _ emer 7 Ooo ze Ise RSTCHERAJK en maen RSTCHIPR 47 KORM rs ms 1A CHPTACTSMTCHHeS 1609 SKQGABEDI en 1609 SKOGABEDIO m CHPTACTSMTCHHeTS 1609 SKOGABEDIO mis oras CHPTACTSMTCHHeTS 1609 SKOGABEDIO
16. _ PwecmecmP osoan r Ian 49 19 LCD Color Monitor L1940T tw mees do em sew _ PANELUMGEDETERRUA CONVERSONBOWDGNGKHOKRUDN _ _ oe eme T mem nous mme GNKETAUMNUMFOL un Diversity compared win tecston Panno Romar wa wea ems mem Loser GONVERSONBOARDGGEIGOKTOUNS _ mz ooo nous oaser _ Up 50 19 LCD Color Monitor L1940T Diversity of T96HNNDBC6HFQP compared with T981KMNDKHHPQP Location Description ALUMINIUM TAPE E089 CABLE EO89A POWER CORD E089A POWER CORD mens s nan pael soenan G1864 1 X X 1 070122 om Jaen _ cwn apere POWERSONRDGIERAOXIONA mmm Jemen owe emm musse cw
17. 15 06 Add new BOM E BM 19 LCD Color Monitor 1 Monitor Specifications LCD Panel Driving system HP L1940T TFT Color LCD M190E5 LOA 376 32 H x 301 056 V 19 0 0 294mm H x 0 294mm V H 150 V 130 8 ms 700 1 Analog Digital TTL 2 83kHz 56Hz 76Hz Display Colors Over 16 million Colors Pixel Clock 140MHz Max Resolution 1280 x 1024 Plug amp Play Power Consumption Power Source Environmental Considerations Main Dimensions Weight N W Altitude DDC2B OFF Mode Sleep Mode 100 240 47 63 2 Operating Temp 5 to 35 Storage Temp 20 to 60 Operating Humidity 20 to 80 Unpackaged W H D Packaged W H D Packaged Unpackaged Operating Non Operating 413mm 477mm 265mm 524mm 513mm 239mm 10 22Kg Unit max 8 4Kg Unit max O to 12 000 feet to 40 000 feet 19 LCD Color Monitor L1940T 2 LCD Monitor Description The LCD Monitor will contain main board power board key board and which house the flat panel control logic brightness control logic and DDC The power board will provide AC to DC Inverter voltage to drive the backlight of panel and the main board chips each voltage Monitor Block Diagram Drive Flat Panel and CCFL backlight Power Board Main Board RS232 Connector LN Include adapter and inverter For white balance
18. R202 100 1 16 20202 UDZS5 6B ZD203 UDZS5 6B R203 DDC DVI SCL DDC DVI SDA 100 1 16 gt gt DVI SCL gt gt DVI SDA TX2 TX2 4 Shid TX4 TX4 DDC CLK DDC DATA TX1 RX2 RX2 TX1 TX1 3 Shld TX3 TX3 5V GND HP Detect TXO TXO 1 RX1 CABLE RXO RX0 TX0 5 Shid TX5 TX5 TXC Shld TXC TXC RXC SHELL2 DVI Input ISPSDA R219 DDC VGA SDA C206 0 1uF D204 BAV99 D205 BAV99 D206 BAV99 D207 BAV99 0208 0209 99 99 0210 99 0211 99 11 3 3V C217 0 1uF D212 BAV99 ot 5 16 ADD C226 GND for ESD 10 mil rk 28 3 3 3 3 DDC_W_D gt DDC DVI SCL to Scalar IC 12 3 100 Mew HS 13 VS 14 DDC VGA SCL pee UDZS5 6B Zi D 20201 UDZS5 6B 2 D 20 23 0L MILL 2224 3 3V R230 NC go sszan GND 0215 BAV70 MOL DDC W A 25 DDCNGA SCE 1 16W 1 16W 5V CABLE 9 R224 2 R N a R226 GL MILL 75 ohm terminating resistor very close to the VGA GND MILL MOL L 90 R227 NC c22
19. R816 R812 a R842 R843 Anse 4 20k OZ9938GN 620K 10R 10R SS 861 a C831 a 1000 846 C832 D851 0 33uF 1UF 0 1uF N N BAV99 as VDD m N N R807 2 1 842 C843 R825 30K 0 001uF 0 001uF 390pF 7 5K 196 8 0 E R853 R819 6 1 2K C819 4M R859 0 01uF 25V 6 2M 1 2W a AM9945N z S ii CONN R861 R863 PANEL_ID 3 PANELID 2 1 Isen 2 1 100K 196 33K 1 4 von Gs e 33nF 232R 12VCC fase R880 10K 1 10 0873 0880 PDTA144EU 2 7002 2 N R874 330 1 10W TPV 2n7002 R873 2K 1 10W C871 0 1uF NC ZD874 RLZ5 6B C880 0 1uF 25V 0881 27002 a Get 1K 100K 1 10 0883 mE Reed D883 2N7002 1 4 2 1K C883 R883 IN4148 A 0 01uF 100K 1 10W 0885 R886 D885 2N7002 1 2 1 lt 1K IN4148 a R885 0 01uF 100K 1 10W 0886 D887 2N7002 1K 1 10 a IN4148 100K 1 10 HP L1940T Adapter Schematic Philips HPL1940 L1740 PCB 715G1821 1 715G1995 1 S901 il 12VCC spotgap_NC C8B R6H_NC 2R2 1206 C900 C931 R932 0 001uF 250v 2 1 3 3nF 500V 2R2_1206 T901 l VAR901 2 0 47uF 275V 11 3 D vai varistor_NC 0907 4 AC SOCKET R904 R905 C920 D931 0 001
20. ot ot 04 04 01 30 se 51 40 30 70 rea re 00 oo an so 36 35 34 39 38 37 35 20 20 00 00 oo FD oo 9 ac 1E 53 og oo 20 20 20 20 oo 00 00 112 48 so 20 4c 39 54 OA 20 20 20 oo 30 Digital oo or ez ros os os or o o e se ss o oo 22 ro 2 on or or e 26 e ee 05 ac oo 26 2 or or on or ov rae o st o ra se 20 20 re e reo 20 ss ac 53 og oo 20 20 20 20 20 20 00 00 112 48 so 20 ac 39 30 54 OA 20 20 20 oo 35 19 LCD Color Monitor L1940T 13 BOM List T981KMNDKHHPQP Location Panno Seene Soen eens roosa werso am fosna mme wes ws c muamo we we ie ee ws we ane
21. volt 110V or 220V OK Check AC line Check the voltage of C907 NG 224 Check F901 bridge rectified circuit OK Check start voltage for the of IC901 NG OK Check R907 IC901 Check the auxiliary voltage is between 10V 17V NG Check IC901 T901 D905 D926 OVP OK Check Q901 D901 FB Circuit 21 19 LCD Color Monitor L1940T 2 WILED No Backlight Measure C811 12V NG Disconnect Q821 Q841 with IC check C811 12V Check power board part OK Check Q873 or Check PT801 PT802 Pin7 pin8 650V Check PT801 PT802 pin7 pin8 650V NG Replace Q873 or Q874 Check U801 Pin1 pin15 export wave Replace lamp OK NG Replace U801 Replace PT801 PT802 NG Check U801 pin 5 pin6 Check Q821 Q841 pin5 pin8 12V Disconnect the lamps OK OK NG 19 LCD Color Monitor L1940T 3 Protected 1 Striking function debug s Connector CTIMER to GND and turn on power supply OVP normally NG Check OVP circuit End Striking function debug 4 Protected 2 FB and protection loop debug Connector CSST and REF and turn on power supply Check IC frequency is normal OK Check FB circuit End FB and protection loop debug 23 9 Schematic 9 1 Main Board 31 CN202 DVI D Female 32 N D 3 SHELL1 AR H y X AG X 5 AVS TX2 DVI 5V 2 FB202 202 120 OHM 1uF
22. 19 LCD Color Monitor L1940T SERVICE MANUAL 19 LCD Monitor L1940T THESE DOCUMENTS ARE FOR REPAIR SERVICE INFORMATION ONLY EVERY REASONABLE EFFORT HAS BEEN MADE TO ENSURE THE ACCURACY OF THIS MANUAL WE CANNOT GUARANTEE THE ACCURACY OF THIS INFORMATION AFTER THE DATE OF PUBLICATION AND DISCLAIMS RELIABILITY FOR CHANGES ERRORS OR OMISSIONS 19 LCD Color Monitor L1940T Table of Contents Table of Contents 02 Revision List 03 1 Monitor Specification 2 LCD Monitor Description 3 Operation Instructions 3 1 General Instructions 3 2 Control Button 3 3 Adjusting The Picture 4 Input Output Specification 4 1 Input Signal Connector 4 2 Factory Preset Display Modes 4 3 Power Supply Requirements 5 Panel Specification 5 1 General Feature 5 2 Optical Characteristics 6 Monitor Exploded View 7 Block Diagram 8 Maintainability 9 Schematic 9 1 Main Board 9 2 Inverter Power Board 10 PCB Layout 10 1 Main Board 10 2 Inverter Power Board 10 3 Key Board 11 White Balance Luminance Adjustment 12 EDID Content 13 BOM List 14 Different Parts List 19 LCD Color Monitor L1940T Revision List Revision Date Revision History TPV T A00 Sep 08 06 Initial release E EI E TOGHNNDKC6HPQP Nov
23. EADFOMANAVGWTU WWE s oras B CHPBEADFOMANAVGWT eum sor orsa B CHPBEADFOMAWDV3WTUTWAWE _ s orsa CHPBEADFOMANDVGWTTWAWE _ oras B CHPBEADFOMANAVEGOTTWAWE _ s orsa 2 _ ors B so orsa CHPBEADFOMANAVGWT RAE oras B CHPBEADFOMAWDVFGWTUTWAWE _ sms orsa CHPBEADFOMAWDVGWT RAE _ 44 19 LCD Color Monitor L1940T mesewerr 1 eener CHPBEADTGREHGHOFRONTER mens CHPBEADTGREHGNOFRONTER mens CHPBEADTGEHIGEOFONER ooo mees e mees ooo rr oo wisis 8 CHPBEOHONWK tirant wisis Came misso misso s wisis e CHPBEADHONZHRFT TR wieso e onn s Ce noon on e wisis mi wm mmm mann e men me mms ema e wu mos eene Lum enn msn OO enn msmsnnner Lum mx as onon Dame seess Lum m
24. N circuit PWM IC 16 19 LCD Color Monitor 8 Maintainability Equipments and Tools Requirement N O FP CQ N gt Multi meter Oscilloscope Pattern Generator DDC Tool with an IBM Compatible Computer Alignment Tool LCD Color Analyzer Service Manual User Manual 17 L1940T 19 LCD Color Monitor 8 1 Main Board Press power key and look if the picture is normal Please reinsert and make sure the AC of 100 240 is normal Reinsert or check the power section Measure 401 PIN7 8 12V PIN10 11 3 3V PIN13 14 5V Check power section Y301 oscillate waveforms are NG OK Replace Y301 Replace 401 normal NG Replace U403 18 L1940T 19 LCD Color Monitor HP L1940T No picture LED is orange No picture Key is under control OK Y301 oscillate waveforms are normal NG OK Replace Y301 Check if the sync signal from computer is output and video cable 5 connected normally Input the sync signal of computer or OK change the cable Replace U401 19 19 LCD Color Monitor L1940T Panel Power Circuit Measure Q403 base is high level Y301 oscillate waveforms are normal NG Check Q403 and Q402 are broken OK Replace Y301 or CN301 solder Replace 0401 Check Correspondent component NG Replace PANEL 20 19 LCD Color Monitor L1940T 8 2 Power Board 1 No Power Check AC line
25. PR 75 OHM 1 1 10W 40 19 LCD Color Monitor L1940T RST CHIPR 1 8 1 1 8W en Teen onon OO RST CHIPR 5 6 1 1 8W DEAE ep uius Dou een DO ep mee emmmer see cap on oss conve Ken eeneg nee em onon Terasse seen cae cmoo oorkom seen cae cmoo oorkom sem Lm seen creme UAR seet cezo one seen ceRz 0a re tov e ser oe seen on seen oss on eenz eero O 1217121 on seet eessen seen Teen o seen Teen seen Jesse on seet eessen eenz ememr on eessen en seen Teen seen Teen e seen oss ser Joes en seet Joes NR e seet eessen Lm seen Tessar Ln ser noua n ser Josee seen 1 en seet Lamm loeren 41 19 LCD Color Monitor L1940T Ise 12 messe zen Jaen 2 CER2O609x7R Jaen 2 CER20609x7R zen Ise 2 oerzosoxmivioone Ise 2 Law Ise 2 CER2O600x7R TVA NE Ise 2 CER2O609x7R Ise 2 messe 2s Jaen CER20609x7R
26. R336 IICSCL IX IICSDA 2 2 3 3 Si 1 16W NC NC 100 1 16W TODEBUG TO 85232 RXO RXC RXC DVI AVCC DVI AVCC DVI PVCC ADC VAA BIN GNDB SOG GIN GNDG RIN GNDR HP L1940T CN302 1 TXO0 2 TXOO TXO1 Eo TXO0 TXO14 4 TXO1 TXO2 E TXO1 25 5 TXO2 NESDA TXO2 8 TXOC TXOC RSTN TXO3 TXO3 TXO34 IRQN TXO3 TXEO gt 1 TXE1 Da TXE1 TXE14 TXE2 gt 2 2 y DVI_AVCC 1 8VDD DES TXE3 ak AC LO st 17 kay ka La X4 2 gt lt a st t Oa gt 6 gt 0 a S m a PANEL_VCC 2 x O H ZS E Oz e oo D za E 8 2 6 o P Ve gt o o x x 849 8 22 amp E 103 Rxo TCLK2M 64 y 104 Gan TCLK2P 105 AGND HZ y 106 Rx
27. UN2211J C502 GND I A 0 01uF 120 OHM GND_U FB501 C503 10uF 16V NC GND U GND U 503 USB3V3 GND_U 9 USB 5V 1 2 VCC pel d del dal 4 1 del d koi we p SS 8 i a 2 22 2 33 5 en SES 5 lt 05 12 07 ADD FB506 FB503 NC GND U USB3V3 e OVR1 S e 501 Y FB504 n dg R511 5900000090054 5 z z 120 HM X UPSTREAM V 1 16W 555555555500 x 5V 0 75 gt gt C518 D501 C517 N x x R512 26 GREEN 22 5 5 5 5 2 100 25 100K 1 16W BAS32L 36 0 1uF 0519 37 GREEN 2 X CN501 0 1uF 38 END U 46 AMBER 2 X m t RESET GREENA 3 745 X AMBER I3 X 17 GREEN 4 X DM2 gt 0520 DM 18 D 0501 AMBER 4 X lt id DPO D DP2 gt 0 1uF 29 CY7C65640 LFXC 30 OVR1 DM a DD 1 L31 x al OVR2 gt DS 14 DD 1 OVR 2 32 vec 7 PWR 3 83 X OVR3 DS n DD 2 OVRAB ez DP1 DD 2 PWRA 4 751 X OVR4 120 OHM 5 5V 0 75A 0 2 00 3 6 3 25 SPICS C522 o 4 00 131 SPI CS e 1 SPISCK 710521 EI 7 DD44 SPI SCK 1O0uF 25V 0 1uF 0 2 4 SPI SD E GND_U o ON CO sf QOTT E aaoaaoooooodotd 4 4 66666666666 DM1 gt DP1
28. V 120 OHM 416 417 C401 0 1u 0 1u ATuF 16V 3 3V 417 CN402 1 R419 18K 1 16W 2 2 K AUTO AUTO 3 2 3 R421 1 8K 1116W 1 Men 4 4 1 8 1 16W 5 5 D 3 6 7 Conn R426 R427 NC 10K 1 16W LED lt KLED_R LED_RED 10K 116 LED LED LED GREEN 421 2207 M6w 53906 Key and LED control 3 3 MOL 7OuF 16V C405 0 1uF gt C408 NC R410 401 0 022uF 5 6K NC lt 18 1 16W alo NO 220 R411NC gt 47K 1 16W FOR USB POWER SUPLY 5V 12 414 OOK 1 16W R418 1 100 1 16W AO3401L FB405 120 PANEL_VCC R423 RA2 Q403 TERT 1 K PMBS3904 D 022uF C420 432 zs O 1uF Panel VDD control 0202 MM1117 1 8 3 3V INPUT OUTPUT ADJ GND lt 428 FOR 1 8V POWER C429 100uF 25V USE 27 1 8VCC NC 116W 715Gxxxx Friday May 05 2006 HP L1940T HP L1940T 3 3V USB3V3 R524 U502 Q502 AT25040AN 10SU 2 7 15441DC SPICS R502 Q MW 1 dee C523 0 116 0 1uF Ri SPISD 8504 116W 2 GND_U 100K 1 16W SO HOLD GND_U SPISCK USB3V30 R506 3 sok L 507 1090 UPSTREAM_V Q501 USB3V3 4 5 R508 146W SPISD M
29. c iot e p35t1 60 BSN IICSDA 408 55 O Y 116W AVCC P34 TO 5 IICSCL N301 109 m 100 1716W REXT PB3 ADC3 INTE1 10 PB2 ADC2 INTEO men 111 P31 TXD MCU_VDD e gt amie rass 100 new PES TES 114 BIN1 53 PANEL VCC GND GND PANEL VCC 148 saa P 52 ER NT68663MEFG 128 PATIPWMS 18 8 AUTO 4 17 Gint 7 006 W A 2 118 RiN1 PA4 PWM6 2 119 Rin1 PA3 PWMS 48 120 Pa2 Pwma NC 121 GNDA PA1 PWM3 122 45 BINO PAO PWM2 2 123 44 eg JTA iud BINO PDO Se 124 socio ME MEU opp E 125 Gino 42 gt 126 Gino por T y 127 RINO TREE po 40 MCU VDD e 10uF 16V o y 128 RINO 2 3 5 3 5 39 a a or 1 1 UE 2 e 10 6 55252 a EE R315 lt R316 PH 2 a gt 2 a 2 O E o s SE 5 6 oo SS A SSES SA Soo 88688 i gt b od a a a O a a a a gt a a a a a a a a a a a a a a a gt gt BL_CONTROL 4 o N en a st a LO Kal we CN e LO L Sa m N N a N CN N N a e e
30. color sRGB color temp parameter is x 313 20 329 20 Y 150 cd m 3 Into factory mode of HP L1940T Turn off the monitor then press AUTO button and MENU button and hold them at the same time then press power on then press Menu button wait until the OSD menu with Characters come on the Screen of the monitor 4 Bias adjustment Set the Contrast D to 80 Adjust the Brightness ce to 90 5 Gain adjustment Move cursor to and press MENU key A Adjust 9300k color temperature 1 Switch the Chroma 7120 to 9300k channel 2 The chroma 7120 will show x 283220 y 297 20 180 cd m 3 Switch the chroma 720 to RGB MODE with press MODE button to change 4 Adjust the RED of color 9300K on factory window until chroma 7120 indicator reached the value 100 5 Adjust the GREEN of color 9300K on factory window until chroma 7120 indicator reached the value G 100 6 Adjust the BLUE of color 9300K on factory window until chroma 7120 indicator reached the value B 100 7 Repeat above procedure item 4 5 6 until chroma 7120 RGB value meet the tolerance 210072 B Adjust 6500K color temperature 1 Switch the chroma 7120 to 6500K channel 33 19 LCD Color Monitor L1940T 2 The chroma 7120 will show x 313 20 y 329 20 Y 180 cd m 3 Switch the chroma 7120 I to RGB MODE with press MODE button to change 4 Adjust the RED of color 6500K on factory window until chroma 7120 indicator r
31. e Treatment Hard coating 3H Anti glare Haze 25 L1940T m m m m mm mm color color 19 LCD Color Monitor L1940T 5 2 Optical Characteristics Test Conditions T 292 Set Signal to typical uereg E STRIGA in 3 CHaRACTERIETICES amp Current_ mA e _ Sa e 5307 Optical Specifications Rx 0645 Ry 332 Green Gx A 285 Color Typ 0 600 Typ Chromaticity 0 70 0 0 0 03 0 151 0 03 Blue Y CS 1000T E 074 ES White Center Luminance of White Contrast Ratio White Variation Cross Talk Horizontal Viewing Angle HP L1940T 19 LCD Color Monitor 6 Monitor Exploded View PANEL_LG_PHILIPS 8639 000 16729 14 19 LCD Color Monitor L1940T 7 Block Diagram 7 1 Scalar Board LCD Interface CN501 Scalar IC NT68663MEFG 128 Include ADC OSD MCU U401 H sync V sync EEPROM RGB M24C16 WBN6 Key Board U302 Control D Sub Connector CN201 CN402 Crystal 12MHz Y301 DDC CLK DDC DAT EEPROM M24C02 U403 15 19 LCD Color Monitor L1940T 7 2 Inverter Power Board Bridge Diode EMI filter Rectifier Rectifier amp filter and Filter Start Circuit R904 R910 CON951 5V PWM Over Control IC Voltage Protect LC resonance Lamp Feedback Full bridge Start Circuit switch circuit OZ9938G
32. eached the value R 100 5 Adjust the GREEN of color 6500K on factory window until chroma 7120 indicator reached the value 100 6 Adjust the BLUE of color 6500K on factory window until chroma 7120 indicator reached the value B 100 7 Repeat above procedure item 4 5 6 until chroma 7120 RGB value meet the tolerance 100 2 C Adjust sRGB color temperature 1 Switch the chroma 7120 to SRGB channel 2 The chroma 7120 will show x 313 20 y 329 20 Y 150 cd m 3 Switch the chroma 7120 I to RGB MODE with press MODE button to change 4 Adjust the RED of color SRGB on factory window until chroma 7120 indicator reached the value R 100 5 Adjust the GREEN of color SRGB on factory window until chroma 7120 indicator reached the value G 100 6 Adjust the BLUE of color SRGB on factory window until chroma 7120 indicator reached the value B 100 7 Repeat above procedure item 4 5 6 until chroma 7120 RGB value meet the tolerance 100 2 D Press reset key and Turn the Power button off to to quit from factory mode 34 19 LCD Color Monitor L1940T 12 EDID Content Analog 4 05 os 11 12 13 14 15 o oo FF FF FF FF FF oo 22 Fo 2 26 or 07 os 01 16 36 10 os 68 26 78 EE EE 95 4C 99 26 32 oF 50 54 aD at ao or or ot or 07 01 48 ot
33. eomsmen em Tee 1 RST CHIPR 10 KOUM 5 1 10W RST 10 KOHM 5 1 10W RST 10 KOUM 5 1 10W RST CHIPR 10 KOHM 5 1 10W RST 10 5 1 10W RST 10 5 1 10W 39 19 LCD Color Monitor L1940T nna ooo eem RST 9 now mee ano mee RTCHPRTEKOMI EE UAM n ep sem DCT an n en sem DCT an er mem Co on Donn eem om oe mem oe ses Don st own en mee 202 e mes ease et Teen ses Ooo sem en omo iow en mes RST GMa 200 On Lum Lum ees Done mow RST CHIPR 249 OHM 1 1 10W RST CHIPR 33 OHM 1 1 10W RST 33 OHM 1 1 10W 1 RST 33 OHM 1 1 10W RST 33 OHM 1 1 10W RST CHIPR 33 OHM 1 1 10W RST 33 OHM 1 1 10W aoz nou DO senn Done non een mes Don 1 een reren mow RST CHIPR 47 OHM 5 1 10W RST 47 KOHM 5 1 10W RST 680 1 1 10W RST CHIPR 75 OHM 1 1 10W RST CHIPR 75 OHM 1 1 10W RST CHI
34. lor Language Management OSD Control Information Factory Reset Exit Factory Mode 1 2 Turn off the monitor then press AUTO button and MENU button and hold them at the same time then press power on then press Menu button wait until the OSD menu with Characters F come on the Screen of the monitor as bellow Push Menu to exit OSD menu Main Menu Contrast Image Control Color Language Management OSD Control Information Factory Reset Factory Mode Indicator Exit 19 LCD Color Monitor L1940T Menu icons zem e dS 3 os o 4 Immens s Gm s osmo fe 03 ewe meem e owwa w wese E 8 PowerOn sits Dapay m woma Ia 35 vera OSD Poston B _ m Le s m osoan _ em 19 LCD Color Monitor L1940T 4 Input Output Specification 4 1 Input Signal Connector Analog Connector Pin layout Sonat _ Signal e fe memo u s wwe efe me VGA connector layout 19 LCD Color Monitor L1940T DVI D Digital Connector Pins 4 TX4 TMDS Data 4 16 HPD lee ees ales Ieper 8 AVS Analog Vertical Sync 20 TX5 TMDS Data 1 TX CLK SHLD TMDS Clock Shield SHLD 1 3 TMDS Data 1 3 Shield TX CLK TMDS Clock TMDS Data 3 TX CLK TMDS Clock DVI D Digital Connector Pins
35. osscnsszzs rup ooze sms Lame Tam Lesen smoro eresas sorron eror aere Lm oonan es aere 0000 0 0 en enen ev 000000000 0 e leoonn Caa orano ornamo aere en suo 1 wresemsr sorron sorron oono weszwesr Soona aere 43 19 LCD Color Monitor L1940T mess SEN oe age sr on w ou oo a ooo Ise omesse KOU MON onn ze Ise omesse wurm us owowirunxr oam mue oe sms O ze owowiruxr cap sase wurm oreo omesse wurm SSS osrGersFronaxT o oreo omesse ourm ooo owoeremer owe sc uray mw Ise Ise om ou Lam Ise om ou o Ise oral oreas omesse wurm owoeswoxr owesusc wurm T _ sui B CHPBEADFOMANDVGWT WARE _ ep raso B CHIP BEAD FowzoravFaorTor wl _ s Immens CHPB
36. uF 250V BD901 1 5M R1206 100K 1W 0 001uF 1KV MBRF10H100CT 45 C932 C933 U4KB80R 1000uF 25V 1000uF 25V 903 C907 E 100uF 450V D901 7 R935 gt 8907 BYT42J 8 1 2 10K R1206 R910 oe FUSE 3 15 250V 5 spotgap_NC 2R2_NC FB901 C935 R936 BEAD 2 2 1 1 e 9 3 3 600 282 zi L wi IC901 D918 1N4148 a lt 2 D935 1 915 10 0901 POWER STPS10L45CFP R937 C913 2 1 1 I STP7NKSOZFP C936 1 8K 1 8W 8918 150 916 C912 1000uF 16V D905 V7 1 2 1 2 1 P4KE_NC R917 FB902 E pen TEUR E 0 0022uF 400V BEAD a 750R R912 C917 0 33uF 25V R959 R919 2 R920 TEA1532 22K NG 2 M 2 0 22R W N N 72 SA NA z O 2 1 0926 R926 8923 12K 1 RGP10D OR C915 R914 0 012uF 25V 1K24 176 2 1 8927 4 7K_1206 E RI pon IC902 Bois 7 1103 Sq AMOU C927 a 68u 25V 5 R946 R944 R941 100K 196 9 1K 0805_1 1K BRIGHTNESS BL 941 0 0056uF PANEL_ID R954 R942 C942 12VCC L951 150 1 10W 2 1 CN951 1 2 12V 27K 4 7nF 25V_NC HARNESS 14P 14P 65mm N C952 R952 R953 951 si SI 10 1K AW NC 0 1uF 25V 20975 1 941 4 RLZ5 1B KIA431A apiy i 9 1K_1 E n 5VA Fuse 5A 250V A C955 C956 1 903 3 3V 3 0 1uF 25V 220u 16V L59720 220u 25V C958 1904 R956 R958 C962 5 6K _1 1K 1000uF 16V C953 0 1uF 25V 961 0 022uF 25V R957 C960 3 16K_1

HP L1940T NT68663MEFG A02

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