COLOR MONITOR SERVICE MANUAL
Contents
1. ZD707 5 20710 5 6B a A pF Ne ZD706 5 6B ki e J705 gt 2 1801 AC1117533T IN s e eur 5vsit D SDAA 4 uso2 LD1117S18TR OUT e 98 4 2 1 8VD 4 C607 zur tov usos KMAADSP2OX Pd 4 KDS1B4 SHOAT CHK Fons Ld option READY READY _ 9 10K 2 2 S opt Di svs 1 2 option SPEAKER BAR MO Ja 0c 3 0002 N 5vsti J706 QH11121 DN0 D ae you 0 SCLB 4 CD SDAB 4 DIET 4 CORXCt 4 THE Z SYMBOL MARK OF THIS SPECIAL FEATURES IMPORTANT FILRE AND ELECTRICAL SHOCK ESSENTIAL THAT ONLY MANUFATURES SPECF THE CRITICAL COMPONENTS IN SCHEMETIC DIAGRAM INCORPORATES FOR PROTECTIO HAZARDS WHEN ED SYMBOL SERVICING IF IS PARTS BE USED FOR MARK OF THE SCHEM THE A CORXC 4 j5vHPD Co DDCSVD FROM X RADIATION ETIC C602 in o Ee 18 J703 SMW200 11 707 1003 H8 30 J702 SMW200 28C Y3P A CLKOUTP A CLKOUTM A Y2P A YaM A YOP A 3 Y0M lt Y3P 8 Y3M 8 CLKOUTP B CLKOUTM B eg ov3p A ego Y3M A te CO KOUTP A eg CO KOUTM A eg ov2p A eg I Y2M A He Y1P A ET a Y1M A Le ovop A raf ovou A He c v3P 8 eg vans i 9 9 3c koure a Lab IC2. YES Wsi 1 CHECK PIN 108 109 NO SOLDERING CONDITION Ea 2 CHECK X501 j 3 TROUBLE IN U501 YES CHECK U501 PIN27 H SYNC AND NO CHECK CONNECTION LINE PIN28 V SYNC FROM D SUB TO U501 IS PULSE APPEARED AT SIGNAL PINS YES TROUBLE IN CABLE OR LCD MODULE Waveforms 4 U501 108 We J N m 1 00 V M25 0ns Chit Lo sa m Copyright 6 2007 LG Electronics Inc All right reserved 16 LGE Internal Use Only Only for training and service purposes 4 TROUBLE IN DPM TROUBLE IN DPM 2 SYNC PULSE YES CHECK R730 AND R731 SYNC NO APPEARED YES 3 CHECK U501 PIN27 28 NO gt CHECK PC PC IS GOING INTO DPM MODE TROUBLE IN U501 Waveforms 1 H SYNC Tek SIE 10 0MS s 1798 Acqs ka Nous CAT A 2091 s apr 2006 09 08 11 2 v SYNC EP Tek SEE 25 0ks s 57 Acqs t 60V Mine RI 3 28 V s apr 2006 09 11 14 gt CHECK H V SYNC LINE Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes 17 LGE Internal Use Only WIRING DIAGRAM 30P 11P EAD37414503 EAD42157802 6P a ns NN 66631900030H Copyright 652007 LG Electronics Inc All right reserved 18 Only for training and service purposes LGE Internal Use Only EXPLODED VI
3. LB 4 BXt 4 CLKOUTP B Y3M 8 v3p a GRN A 4 C a a a anno a a A aunvonoonaogos mo mmm mmm o D SDAA 1 VDDC34 O_Pee 0_P24 VDDP49 VDDP32 GPIOLP15 PWM D SCLA 1 2 R9232 RX 12C_MC GP O P141 12C MDA PWMeYGPI GPIOLP27 PWM 1 IO P1 3 3V PLI 1 GP uso2 SST25VE020 204C SAE DDCA_SCL GP 13 3vo 4 MODON 1 2 I 4 BVD Ut 13 3V PL 1 2 4 7K R517 2 SDATA EPROM 1 THE IN SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X RADIATION FILRE AND ELECTRICAL SHOCK HAZARDS WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR MAL ui M ES CREE ee SEHE RR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC e LG ELELTRONILS BLULK SCALER GHEET 7 2 J701 CN DS 0062 KDS226 KDS226 s GRN A t 9 Pa uz i00 PEE alc yo 7 J D SCLA 4 ZD705 5 6B C720 68 C721 C sT DET 1 pF R727 4 7K i C722 68 1H C723 68pi 68pF eB
4. 3 1 Sync Signal Type Separate Sync SOG 3 2 Video Input Signal 1 Type R G B Analog 2 Voltage Level 0 0 71 V a Color 0 0 0 Vp p b Color 7 0 0 467 Vp p C Color 15 0 0 714 Vp p 3 Input Impedance 75Q 3 3 Operating Frequency Horizontal 30 83kHz Vertical 56 75Hz Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes 4 MAX RESOLUTION Analog 1440 x 900 75Hz 5 POWER SUPPLY 5 1 Power Adaptor Built in Power Input AC 100 240V 50 60Hz 0 8A 5 2 Power Consumption MODE HN SYNC VIDEO POWER CONSUMPTION LED COLOR less than 39 W max POWER ON NORMAL ON ON ACTIVE BLUE less than 36 W typ STAND BY OFF ON OFF less than 1 W AMBER SUSPEND ON OFF OFF less than 1 W AMBER DPMS OFF OFF OFF OFF less than 1 W AMBER POWER S W OFF less than 1 W OFF 6 ENVIRONMENT 6 1 Operating Temperature 10 C 35 C 50 F 95 F 6 2 Relative Humidity 1096 8096 Non condensing 6 3 MTBF 50 000 HRS with 9096 Confidence level Lamp Life 40 000 Hours Min 7 DIMENSIONS with TILT SWIVEL Width 448 4 mm 17 65 Depth 198 4 mm 7 81 Height 883 3 mm 15 09 8 WEIGHT with TILT SWIVEL Net Weight Gross Weight 3 25 kg 7 22 lbs 4 55 kg 10 11 Ibs LGE Internal Use Only PRECAUTION WARNING FOR THE SAFETY RELATED COMPONENT There are some special components used in LCD monitor that
5. Click Update button C Click Write button c Remove all default number d Add 300 3FF e Click Start button f Click Exit button Copyright 2007 LG Electronics Inc All right reserved WER LGE Internal Use Ont Only for training and service purposes y SERVICE OSD 1 Turn off the power switch at the right side of the display 2 Wait for about 5 seconds and press MENU POWER switch for 1 second interval 3 The SVC OSD menu contains additional menus that the User OSD menu as described below a CLEAR ETI To initialize using time c Auto Color W B balance and Automatically sets the gain and offset value press key for over 3 sec AGING Select Aging mode on off Module To select applied module NVRAM INIT EEPROM initialize 24C16 press key for over 3 sec R G B 9300K Allows you to set the R G B 9300K value manually f R G B 6500K Allows you to set the R G B 6500K value manually g R G B Offset Allows you to set the R G B Offset value manually Analog Only h R G B Gain Allows you to set the R G B Gain value manually Analog Only d b d e TJ e ama WH Video Signal Generator OR W DOOQOOQQOQOOQOOOQOQOGO 9 O OJO O O O O O 0 8 0 mE PARALLEL PORT OFF o ON DV ka Power inlet required Control Line
6. Inc All right reserved Only for training and service purposes WARNING BE CAREFUL ELECTRIC SHOCK If you want to replace with the new backlight CCFL or inverter circuit must disconnect the AC adapter because high voltage appears at inverter circuit about 650Vrms Handle with care wires or connectors of the inverter circuit If the wires are pressed cause short and may burn or take fire Leakage Current Hot Check Circuit AC Volt meter Good Earth Ground such as WATER PIPE CONDUIT etc To Instrument s exposed METALLIC PARTS W 1 5 Kohm 10W LGE Internal Use Only SERVICING PRECAUTIONS CAUTION Before servicing receivers covered by this service manual and its supplements and addenda read and follow the SAFETY PRECAUTIONS on page 3 of this publication NOTE If unforeseen circumstances create conflict between the following servicing precautions and any of the safety precautions on page 3 of this publication always follow the safety precautions Remember Safety First General Servicing Precautions 1 Always unplug the receiver AC power cord from the AC power source before a Removing or reinstalling any component circuit board module or any other receiver assembly b Disconnecting or reconnecting any receiver electrical plug or other electrical connection c Connecting a test substitute in parallel with an electrolytic capacitor in the receiver CAUTION A wrong part substitution or i
7. Power Select Switch ei i le ON 110V 220V KAN 4 Power LED 0 999 ord 04 E V Sync On Off Switch Switch must be ON Figure 1 Cable Connection Copyright 2007 LG Electronics Inc All right reserved 13 Only for training and service purposes CGE Internal Use Only TROUBLESHOOTING GUIDE 1 NO POWER NO POWER POWER INDICATOR OFF CHECK POWER BOARD 1 CHECK J703 VOLTAGE NO ge AND FIND OUT A SHORT PIN5 PIN6 5V POINT AS OPENING EACH POWER LINE 2 IS U602 PIN3 3 8V NO gt CHECK U602 1 8V 3 U601 PIN3 3 3V U601 3 3V LINE ves NO 4 CHECK U501 PIN108 CHECK CRYSTAL X501 PULSE yrs CHECK U501 1 J703 5 6 2 U602 2 3 U601 2 4 U501 108 Tek Run 10 We Sample e 1 Tek Run eege Sample ki 1 Tek Run 10 spes Sample 1 Tek SE 4 0065 s 36 Acqs be been si fet qe e 2 DATES fa Soov i amp sov DEE EH f Ci Freg i 145296942 FN AN 7 1 A E f Y 7 I f if pon ra j vs RA 4 Fa fe i Mi Ya m We P i BH 00V toms cii Chi apr 2006 rare wm CR CRT 5 Apr 2006 EI rory wroonis cit Chi 5 Apr 2006 TaY masons CAT Zeg sapr 2008 08 49 27 08 50 36 08 51 09 Copyright 2007 LG Electronics Inc All right reserved
8. SC A310 2012 4K 201 e 2012 d a302 c323 E 2N70021F O1uF treo Se EPA an a333 A 3 dude Pe 470pF eui T sov x 3 E D304 e MM4 148 THE A SYMBOL ECTAL FEATU FILRE AND ELECTRICAL SHOCK ESSENTIAL THA THE CRITICAL COMPONENTS IN R315 430K 2012 HIGH VERSION 330K Q304 N39048 A324 10K an3904s A316 22 A e 9 e 22v 1 4 C307 c306 0591 JF ee a A7OUF d 50v 50v 20301 351 3516 asv 118 SC HS30 a L a RECH 10pF 50v NPO 140 MARK 0 ES IMPORTANT FO 1 PROTEC HAZARDS URES T ONLY MANUFA HIS SCHEMETIC DIAG ION FRO HEN SERVICING IF IS SPECFIED PARTS BE USED FOR THE A SYMBOL MARK OF THE SCHEMETIC JAM I UU R307 10K 1 10W 5 e 20302 103 ene u303 APM4048DU4 Ready for 20 22inch u304 APM4048DU4 OLP 1 n325 1 10W 10K 5 Ons 1 10W 5 30 2200pF 50v 0303 kise BAW56 TOK E ai QLP 3 R327 1710W 10K 5 gt OLP A L amp ELECTRONICS BAIKAL 3 LIP INVERTER C401 22000F div Li Dr 9 E D401 3 a d savas D Bx sg e BAV70 as D402 1 2 2UF ELA 3216 ele 25V T C408 m ba 3 aes nS S A 50v 304 e TP47 23 2400 1K 300
9. are important for safety These parts are marked on the schematic diagram and the replacement parts list It is essential that these critical parts should be replaced with the manufacturer s specified parts to prevent electric shock fire or other hazard Do not modify original design without obtaining written permission from manufacturer or you will void the original parts and labor guarantee TAKE CARE DURING HANDLING THE LCD MODULE WITH BACKLIGHT UNIT Must mount the module using mounting holes arranged in four corners Do not press on the panel edge of the frame strongly or electric shock as this will result in damage to the Screen Do not scratch or press on the panel with any sharp objects such as pencil or pen as this may result in damage to the panel Protect the module from the ESD as it may damage the electronic circuit C MOS Make certain that treatment person s body are grounded through wrist band Do not leave the module in high temperature and in areas of high humidity for a long time The module not be exposed to the direct sunlight Avoid contact with water as it may a short circuit within the module If the surface of panel become dirty please wipe it off with a softmaterial Cleaning with a dirty or rough cloth may damage the panel A CAUTION Please use only a plastic screwdriver to protect yourself from shock hazard during service operation Copyright 2007 LG Electronics
10. 0 1 3 21 7 H Pixels 57 283 49 725 1152 832 32 64 224 832 x 624 V Lines 74 55 667 624 1 3 39 8 H Pixels 65 0 48 363 1344 1024 24 136 160 1024 x 768 V Lines 60 0 806 768 3 6 29 9 H Pixels 78 75 60 123 1312 1024 16 96 176 1024 x 768 V Lines 75 029 800 768 1 3 28 10 H Pixels 100 0 68 681 1456 1152 32 128 144 1152 x 870 V Lines 75 062 915 870 3 3 39 11 H Pixels 92 978 61 805 1504 1152 18 134 200 1152 x 900 V Lines 65 96 937 900 2 4 31 12 H Pixels 108 0 63 981 1688 1280 48 112 248 1280 x 1024 V Lines 60 02 1066 1024 1 3 38 13 H Pixels 135 0 79 976 1688 1280 16 144 248 1280 X 1024 V Lines 75 035 1066 1024 1 3 38 14 H Pixels 88 750 55 5 1600 1440 48 32 80 1440 x 900 V Lines 59 90 926 900 3 6 17 15 H Pixels 106 500 55 935 1904 1440 80 152 232 1440x 900 V Lines 59 887 934 900 3 6 25 16 H Pixels 136 750 70 635 1936 1440 96 152 248 1440x 900 V Lines 74 984 942 900 3 6 33 Copyright 2007 LG Electronics Inc All right reserved 7 LGE Internal Use Only Only for training and service purposes DISASSEMBLY 1 Pull the cabinet upwards Pull the cabinet upwards Then push the button push to separate Then separate all latches on each side the hinge body and stand body 3 4 Remove the control button from cabinet Then disassemble the connector 5 6 Separate the lamp shield from rear shield Turn around the base lock to open the Please pull off the lat
11. A ou R110 Asia ziv an D105 eos 100K W l gt NC d EL 4 2 or 2 OU ee 9 V ier Kos SE S N v 313 el EL17 2 10 2W ER e e ag l e ELA e 8 3 B l 5 G D202 m iis p SB350L 5703 484 ag 4 7 ll o gt e ZZ rou mo y 1 4 e bet asov Kiche x uis E 2 Qo ll 5V 1 5A vA u on Er gt e 4 e av 1000v EL2 D 03 gigs B211 0 1UF 50V a TF2820 53 5703 0204 c212 1K 1N4007 L T101 mm T NC RENE 3248 C213 D102 N 52030 AEN SBL1080CT d 2 1 4w T W I 1 CY104 l 4700pF l l 250v SR l OPTION l R203 2 NC R208 2K 2012 e e 3 x 2 e U101 N 4 1 LAFOOO1 o A204 LTY R209 68K He 1 6wW vem S 2012 AX cs re _ E R122 EL13 m b a 1N4148 4 7 1 You LATCH SS 3 s 227 0101 e T E SSS7N60B RI C 4 5 Bee 2 u201 x 1 zes P e e A R112 13K 8018 1 e a 1K 2012 C214 1000pF 50v V v n R109 0 51 1w CB P N EAX40342101 THE N SYMB L MARK OF THIS SCHEMETIC DIAGRAM I SPECIAL FEATURES IM NI 1 PROTECTION FROM X RADIATION p BPFFFFFFFFrFrrFPFFFTTFrwrri Eh MODE em Se an FILRE AND ELECTRICAL SHOCK HAZARDS ESSENTIAL 0 MANUFATURES SPECFIED PARTS BE USED Iri ANLO HE CRITICAL COMPONENTS m EA SYMBOL MARK OF HE SCHEMETIC Git ELELTRONILS BLOCK X OLA U304 FAN7314 A308 10K AAA 2012 A305 NC 3 2012 R331 2 10K 9332 2012 105889
12. EW 19 Note Safety mark EXPLODED VIEW PARTS LIST Ref No Part No Description 300 N ABJ37045301 Cabinet Assembly W1942T W1942 19 W1942T AUO BOE NEC HSD DUAL HIGH GLOSSY CABINET ASSY 310 N MEY40926601 Knob MOLD ABS HF 350 MAIN 5 key WX42 BLACK 320 A MBG41956001 Button Power MOLD ABS WX42 translucent ABS power button lens 400 ACQ35578202 Cover Assembly Rear W1942 WX42 19 W1942 LPL BACK COVER ASM ANALOG ACQ35578204 Cover Assembly Rear W1942 WX42 19 W1942 AUO BOE BACK COVER ASM ANALOG ACQ35578206 Cover Assembly Rear W1942 WX42 19 W1942 COM BACK COVER ASM ANALOG 410 MDQ41956301 Frame PRESS SBHG 0 8 W1942 W2042 SBHG rear shield analog 420 MDQ41956801 Frame PRESS SBHG 0 6 W1942 SBHG lamp shield 430 MCK40926801 Cover MOLD ABS HF 350 Wx42 ABS Hinge body 440 MCK40927901 Cover MOLD ABS HF 350 Wx42 ABS HINGE COVER 910 MCK40928201 Cover MOLD ABS HF 350 Wx42 ABS Stand body 920 AAN35581001 Base Assembly BASE W1942 W2042 AB W1942 W2042 BASE ASM 200 EAJ36290801 LCD Module TFT LM190WX1 TLC1 DRIVER 19INCH 1440X900 300CD COLOR 72 16 10 850 1 5ms MAGNA source D IC OKI gate D IC TLI T con 160 160 P7 LG PHILIPS LCD or EAJ36290802 LCD Module TFT LM190WX1 TLC2 DRIVER 19INCH 1440X900 300CD COLOR 72 16 10 850 1 P7 5ms Non ZBD MAGNA source D IC OKI gate D IC TLI T con 160 160 LG PHILIPS LCD 330 EBR41617001 PCB Assembly CON
13. LKOUTM B 5VS 1 2 SCALER PWM 1000hm IPS PWM CONTROL 2 konm lt Dpcsv 1 INVON Kosie4 D701 opt ion READY el JIMADJ 4 4 J704 3715 MMBD301LT1 AD SDAA LA SMW200 08 708 53398 0690 ENEE e 705 c708 Tue Si seele PWM 100pF LIPS PWM 1uF C704 azo1 AL c DDCSVD 803 M24C02 RMN6T A2 KST3906 MTF A704 120 KDS184 D710 R705 R706 100 EEPROM 4 KEYO 4 2 e D0 SDAB 4 LG ELECTRONICS I I c702 0 O1uF BAIKAL LAMPADJ 4 2 R711 A707 100 KEY4 4 2 8702 ae ie BL 4 I KST3S06 MTR duis c703 E wein DATE 2007 10 17 POWER amp WAFER SHEET 2 7 3 F101 SPAN 22 5x5 0 R202 5101 A Pa 1000pF1KV 24 2 g CP ZAS A ar BD A ir BL 031S H ELT EL20 zx 0107 NB 0205 20 L E 2405 L201 m Y c 7 0uH e e e K H T 203 _ c206 NE sz fou pa bios 4 70UFZZZZ 470UF 22V 1 1A 3 t 35V 35V J38 v 1002 07 2200pF 2 L on e e C 2ev ao n dod A JA tT 2405
14. Only for training and service purposes ale LGE Internal Use Only 2 NO RASTER OSD IS NOT DISPLAYED LIPS NO RASTER OSD IS NOT DISPLAYED J703 PIN9 5V YES 2 CHECK J703 PIN10 CHECK J703 VOLTAGE PIN5 6 5V NO YES NO CHECK POWER BOARD LIPS NO CHECK U501 INVERTER ON OFF PORT CHECK PULSE AS CONTACTING PROBE TO THE LAMP WIRE OF THE NO 1 CONFIRM BRIGHTNESS OSD CONTRL STATUS 2 CHECK MICOM DIM ADJ PORT YES REPLACE LCD MODULE Waveforms gt POWER BOARD LIPS 1 J703 5 6 Tek Run 10 0kS s Sample E EU 10V Toms Glitch Chi 5 apr 2006 2 J7034H0 lek kun 50 0K87s Sample L t4 mee tier n nest BN 20V CH2 S on Ms CRT BEOMV 26 May 2006 Chi sodomy 08 05 02 08 49 27 3 LAMP CURRENT Tek SITE 10 0MS s 878 Acqs E F la 34 2 V a 17 0 V C1 Freg 48 135kH2 VI Chi 12V 5 Apr 2006 09 12 50 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes 15 LGE Internal Use Only 3 NO RASTER OSD IS NOT DISPLAYED MAIN NO RASTER OSD IS NOT DISPLAYED CHECK U501 NO CHECK U602 1 8V PIN2 3 3V U601 3 3V PIN17 1 8V
15. TROL T T LM73A BAIKAL 3 19 INCH RD 450 EBU41912301 Main Total Assembly BAIKAL III MSTAR ANALOG BRAND LM73B 460 A EBR36269403 PCB Assembly Power POWER T T LM 57C BAIKAL II 20 3 3vD 4 2 ST DETI4 2 DDET SHORT CHK 4 gj x501 14 348MHz e 3 3v RLI4 2 D SDA GPIO_P16 PWM2 AVDD MPI PWMO GPIO_P26 GPIO PO2 SAR3 GPIO PO1 SAR2 GPIO_POO SAR1 PWM1 GPIO P25 GPIO P14 GPIO PO7 GPIO PO6 DD D SDAB DDCL SCL ds DF BYPASS GND2 GND79 9 A Rt LVBOM R LVBOP GNDS GND76 4 2 G VDDP75 G LVB1M Ms AVDD DVIB LVB1P MAN Bt LvB2M AI PXO 4 vu B LVB2P RXO 4 Y2p B GND11 TSUM56AWL LVBCKM CLKOUTM B EKE LVBCKP CK L VB3M AVDD DVI14 LVB3P R509 390 P REXT VDDC66 AVDD_PLL LVAOM RN I si e LIPS PWM DIMMING LM O47uF BINOM LVAOP x ESYOR A c 3svstt 2 R502 56 C 047UF BINOP LVA1M BLU A 4 o Zb C YIM A 5 M 5 O47uF GINOM LVA1P SON ption READY R504 56 _ 05050 047UF GINOP 4 LVA2M c omast ail YEM A Tasos OOpF SOGINO LVAeP E Y2P A A523 C 380 047UF RINOM LVACKM 4 Fi a502 CLKOUTM A 4 omw KST3204 R507 047UF RINOP LVACKP Ee opt ion AEADY e PP t On READY AVDD_ADC GND57 uod REFM m KST3904 REFP ISYNCO VSYNCO MODE 1 1503 VSYNC 4 M24C 16 WMNET GND29 MODE 0 ge POTE NI DDCA SDA RS232 TX VDDC51
16. Website http biz LGservice com G E mail http www L GEservice com techsup html COLOR MONI TOR CHASSIS NO LM57G MODEL FLATRON W1942S W1942S PFT A QF Same model for Service CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL CONTENTS SPECIFICATIONS se e 2 ADJUSTMENT uneessnenneennennennennen nennen 12 PRECAUTIONS eee 3 TROUBLESHOOTING GUIDE nenn 14 TIMING CHART u ite ec ete detiene tuts 7 WIRING DIAGRAM eee 18 DISASSEMBLY eee 8 EXPLODED MI EW eee etn eereeneeeees 19 BLOCK DIAGRAM esee 9 REPLACEMENT PARTS LIST 21 DESCRIPTION OF BLOCK DIAGRAM 11 SCHEMATIC DIAGRAM nenn 25 SPECIFICATIONS 1 LCD CHARACTERISTICS Type TFT Color LCD Module Active Display Area 19 inch diagonal Pixel Pitch 0 285 H x 0 285 V Size 428 H x 278 V x 18 5 D Color Depth 16 7M 8bit FRC colors Electrical Interface LVDS Surface Treatment Operating Mode Backlight Unit Anti Glare Hard Coating 3H Transmissive mode Normally White 4 CCFL N OPTICAL CHARACTERISTICS 2 1 Viewing Angle by Contrast Ratio 2 10 Left 85 Typ Top 85 Typ Right 85 Typ Bottom 85 Typ 2 2 Luminance 180 Typ Typ 30 250 min 300 Typ 6500K 150 min 9300K 2 3 Contrast Ratio 8000 min DFC 5000 1 Typ SIGNAL Refer to the Timing Chart
17. ch first lock between base cover and stand body 7 Then separate stand body and base cover Copyright 2007 LG Electronics Inc All right reserved ses Only for training and service purposes EIERE BLOCK DIAGRAM NEE WOU use m E gt AS 929A sou ZUN9ET ZHO9D006XOttT oJEj1aJUI jaueg SGA NEE I ZHWSTE LT Je3sA45 J0jeJoUo t 72019 jueure uequa eui asuodsay wa31sAS WOAIII 195 vas ou dug 928 UT jenq oulbug Buisse20Jd Aejdsiq 1HM88Sn Wh Sl NEE sdue a 19110Au 8 5 u 1 bojeuy Jay LGE Internal Use Only Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes DESCRIPTION OF BLOCK DIAGRAM 1 Video Controller Part This part amplifies the level of video signal for the digital conversion and converts from the analog video signal to the digital video signal using a pixel clock The pixel clock for each mode is generated by the PLL The range of the pixel clock is from 25MHz to 136MHz in W1942S case 28MHz to 146MHz In W1942S CASE This part consists of the Scaler ADC convertor TMDS receiver and LVDS transmitter The Scaler gets the video signal converted analog to digital interpolates input to 1440 X 900 resolution signal and outputs 8 bit R G B signal to transmitter 2 Power Part This part consists of the one 3 3V and one 1 8V regulators to convert power whi
18. ch is provided 5V in Power board 18V is provided for inverter 5V is provided for LCD panel and micom in W1942S case Also 5V is converted 3 3V and 1 8V by regulator Converted power is provided for IC in the main board The inverter converts from DC18V to AC 700Vrms and operates back light lamps of module in W1942S case 3 MICOM Part This part is include video controller part And this part consists of EEPROM IC which stores control data Reset IC and the Micom The Micom distinguishes polarity and frequency of the H V sync are supplied from signal cable The controlled data of each modes is stored in EEPROM Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes 10 LGE Internal Use Only LIPS Board Block Diagram 50 60Hz EMI INPUT RECTIFIER ENERGY Site OUTPUT RECTIFIER COMPONENTS AND FILTER TRANSFER AND FILTER LINE 100 240V PWM PHOTO SIGNAL CONTROL COUPLER Collection CIRCUIT ISOLATION ION PRIMARY SECONDARY Operation description_Power EMI components This part contains of EMI components to comply with global marketing EMI standards like FCC VCCI CISPR the circuit included a line filter across line capacitor and of course the primary protection fuse 2 Input rectifier and filter This part function is for transfer the input AC voltage to a DC voltage through a bridge rectifier and a bulk capacitor 3 Ener
19. e surface such as aluminum foil to prevent electrostatic charge buildup or exposure of the assembly 3 Use only a grounded tip soldering iron to solder or unsolder ES devices 4 Use only an anti static type solder removal device Some solder removal devices not classified as anti static can generate electrical charges sufficient to damage ES devices 5 Do not use freon propelled chemicals These can generate electrical charges sufficient to damage ES devices 6 Do not remove a replacement ES device from its protective package until immediately before you are ready to install it Most replacement ES devices are packaged with leads electrically shorted together by conductive foam aluminum foil or comparable conductive material 7 Immediately before removing the protective material from the leads of a replacement ES device touch the protective material to the chassis or circuit assembly into which the device will be installed CAUTION Be sure no power is applied to the chassis or circuit and observe all other safety precautions 8 Minimize bodily motions when handling unpackaged replacement ES devices Otherwise harmless motion such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity sufficient to damage an ES device LGE Internal Use Only General Soldering Guidelines 1 Use a grounded tip low wattage soldering iron and appropriate tip siz
20. e and shape that will maintain tip temperature within the range or 500 F to 600 F 2 Use an appropriate gauge of RMA resin core solder composed of 60 parts tin 40 parts lead 3 Keep the soldering iron tip clean and well tinned 4 Thoroughly clean the surfaces to be soldered Use a mall wire bristle 0 5 inch or 1 25cm brush with a metal handle Do not use freon propelled spray on cleaners 5 Use the following unsoldering technique a Allow the soldering iron tip to reach normal temperature 500 F to 600 F b Heat the component lead until the solder melts c Quickly draw the melted solder with an anti static suction type solder removal device or with solder braid CAUTION Work quickly to avoid overheating the circuitboard printed foil 6 Use the following soldering technique a Allow the soldering iron tip to reach a normal temperature 500 F to 600 F b First hold the soldering iron tip and solder the strand against the component lead until the solder melts c Quickly move the soldering iron tip to the junction of the component lead and the printed circuit foil and hold it there only until the solder flows onto and around both the component lead and the foil CAUTION Work quickly to avoid overheating the circuit board printed foil d Closely inspect the solder area and remove any excess or splashed solder with a small wire bristle brush IC Remove Replacement Some chassis circuit boards have sl
21. emblies unless all solid state device heat sinks are correctly installed 8 Always connect the test receiver ground lead to the receiver chassis ground before connecting the test receiver positive lead Always remove the test receiver ground lead last Copyright 62007 LG Electronics Inc All right reserved Only for training and service purposes 9 Use with this receiver only the test fixtures specified in this service manual CAUTION Do not connect the test fixture ground strap to any heat sink in this receiver Electrostatically Sensitive ES Devices Some semiconductor solid state devices can be damaged easily by static electricity Such components commonly are called Electrostatically Sensitive ES Devices Examples of typical ES devices are integrated circuits and some field effect transistors and semiconductor chip components The following techniques should be used to help reduce the incidence of component damage caused by static by static electricity 1 Immediately before handling any semiconductor component or semiconductor equipped assembly drain off any electrostatic charge on your body by touching a known earth ground Alternatively obtain and wear a commercially available discharging wrist strap device which should be removed to prevent potential shock reasons prior to applying power to the unit under test 2 After removing an electrical assembly equipped with ES devices place the assembly on a conductiv
22. gy Transfer This part function is for transfer the primary energy to secondary through a power transformer 4 Output rectifier and filter This part function is to make a pulse width modulation control and to provide the driver signal to power switch to adjust the duty cycle during different AC input and output loading condition to achieve the dc output stabilized and also the over power protection is also monitor by this part 5 Photo Coupler isolation This part function is to feed back the DC output changing status through a photo transistor to primary controller to achieve the stabilized DC output voltage 6 Signal collection This part function is to collect the any change from the DC output and feed back to the primary through photo transistor Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes S11 LGE Internal Use Only ADJUSTMENT Windows EDID V1 0 User Manual 2 EDID Read amp Write 1 Run WinEDID exe Operating System MS Windows 98 2000 XP WinEDID V 1 0 CS Port Setup Windows 98 gt Doesn t need setup Windows 2000 XP gt Need to Port Setup This program is available for LCD Monitor only 1 Port Setup a Copy UserPort sys file to c WINNT system32 drivers folder b Run Userport exe 2 Edit Week of Manufacture Year of Manufacture Serial Number a Input User Info Data b
23. m4 C411 2 1 ia pa e Sv C445 sl e 20408 2200pF 7 a Ready div RUM i 3 4 I e e e e Ready Bai 6 5 4 0426 2200pF Gv C418 sp C419 8 8 apa 2404 77 Bavog men c 3 3 Ky 15PF C427 22000 c423 PCB P N EAX40312101 2007 08 28 MAR 2008 P NO MFL32179251 Printed in China
24. ncorrect polarity installation of electrolytic capacitors may result in an explosion hazard d Discharging the picture tube anode 2 Test high voltage only by measuring it with an appropriate high voltage meter or other voltage measuring device DVM FETVOM etc equipped with a suitable high voltage probe Do not test high voltage by drawing an arc 3 Discharge the picture tube anode only by a first connecting one end of an insulated clip lead to the degaussing or kine aquadag grounding system shield at the point where the picture tube socket ground lead is connected and then b touch the other end of the insulated clip lead to the picture tube anode button using an insulating handle to avoid personal contact with high voltage 4 Do not spray chemicals on or near this receiver or any of its assemblies 5 Unless specified otherwise in this service manual clean electrical contacts only by applying the following mixture to the contacts with a pipe cleaner cotton tipped stick or comparable non abrasive applicator 1096 by volume Acetone and 9096 by volume isopropyl alcohol 9096 9996 strength CAUTION This is a flammable mixture Unless specified otherwise in this service manual lubrication of contacts in not required 6 Do not defeat any plug socket B voltage interlocks with which receivers covered by this service manual might be equipped 7 Do not apply AC power to this instrument and or any of its electrical ass
25. oard will weaken the adhesive that bonds the foil to the circuit board causing the foil to separate from or lift off the board The following guidelines and procedures should be followed whenever this condition is encountered At IC Connections To repair a defective copper pattern at IC connections use the following procedure to install a jumper wire on the copper pattern side of the circuit board Use this technique only on IC connections 1 Carefully remove the damaged copper pattern with a sharp knife Remove only as much copper as absolutely necessary 2 carefully scratch away the solder resist and acrylic coating if used from the end of the remaining copper pattern 3 Bend a small U in one end of a small gauge jumper wire and carefully crimp it around the IC pin Solder the IC connection 4 Route the jumper wire along the path of the out away copper pattern and let it overlap the previously scraped end of the good copper pattern Solder the overlapped area and clip off any excess jumper wire Copyright 652007 LG Electronics Inc All right reserved Only for training and service purposes At Other Connections Use the following technique to repair the defective copper pattern at connections other than IC Pins This technique involves the installation of a jumper wire on the component side of the circuit board 1 Remove the defective copper pattern with a sharp knife Remove at least 1 4 inch of copper to ens
26. otted holes oblong through which the IC leads are inserted and then bent flat against the circuit foil When holes are the slotted type the following technique should be used to remove and replace the IC When working with boards using the familiar round hole use the standard technique as outlined in paragraphs 5 and 6 above Removal 1 Desolder and straighten each IC lead in one operation by gently prying up on the lead with the soldering iron tip as the solder melts 2 Draw away the melted solder with an anti static suction type solder removal device or with solder braid before removing the IC Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes Replacement 1 Carefully insert the replacement IC in the circuit board 2 Carefully bend each IC lead against the circuit foil pad and solder it 3 Clean the soldered areas with a small wire bristle brush It is not necessary to reapply acrylic coating to the areas Small Signal Discrete Transistor Removal Replacement 1 Remove the defective transistor by clipping its leads as close as possible to the component body 2 Bend into a U shape the end of each of three leads remaining on the circuit board 3 Bend into a U shape the replacement transistor leads 4 Connect the replacement transistor leads to the corresponding leads extending from the circuit board and crimp the U with long nose pliers to insure metal to me
27. tal contact then solder each connection Power Output Transistor Device Removal Replacement 1 Heat and remove all solder from around the transistor leads 2 Remove the heat sink mounting screw if so equipped 3 Carefully remove the transistor from the heat sink of the circuit board 4 Insert new transistor in the circuit board 5 Solder each transistor lead and clip off excess lead 6 Replace heat sink Diode Removal Replacement 1 Remove defective diode by clipping its leads as close as possible to diode body 2 Bend the two remaining leads perpendicular y to the circuit board 3 Observing diode polarity wrap each lead of the new diode around the corresponding lead on the circuit board 4 Securely crimp each connection and solder it 5 Inspect on the circuit board copper side the solder joints of the two original leads If they are not shiny reheat them and if necessary apply additional solder Fuse and Conventional Resistor Removal Replacement 1 Clip each fuse or resistor lead at top of the circuit board hollow stake 2 Securely crimp the leads of replacement component around notch at stake top 3 Solder the connections CAUTION Maintain original spacing between the replaced component and adjacent components and the circuit board to prevent excessive component temperatures LGE Internal Use Only Circuit Board Foil Repair Excessive heat applied to the copper foil of any printed circuit b
28. ure that a hazardous condition will not exist if the jumper wire opens 2 Trace along the copper pattern from both sides of the pattern break and locate the nearest component that is directly connected to the affected copper pattern 3 Connect insulated 20 gauge jumper wire from the lead of the nearest component on one side of the pattern break to the lead of the nearest component on the other side Carefully crimp and solder the connections CAUTION Be sure the insulated jumper wire is dressed so the it does not touch components or sharp edges LGE Internal Use Only TIMING CHART VIDEO A lt E D SYNC T Sync Dot Total Video Sync Front Blanking IV Polarity Clock Frequency Peod Tima A wore 6 B Resolution 1 H Pixels 25 175 31 469 800 640 16 96 48 640 x 350 V Lines 70 09 449 350 37 2 60 2 H Pixels 28 321 31 468 900 720 18 108 54 720 X 400 V Lines 70 08 449 400 12 2 35 3 H Pixels 25 175 31 469 800 640 16 96 48 640 x 480 V Lines 59 94 525 480 10 2 33 4 H Pixels 31 5 37 5 840 640 16 64 120 640 x 480 V Lines 75 500 480 1 3 16 5 H Pixels 40 0 37 879 1056 800 40 128 88 800 x 600 V Lines 60 317 628 600 1 4 23 6 H Pixels 49 5 46 875 1056 800 16 80 160 800 x 600 V Lines 75 0 625 60
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