LG FLATRON W1941S(W1941S-PFT.A***QF) Service Manual Download Page 1

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COLOR MONITOR

SERVICE MANUAL

Website:http://biz.LGservice.com

E-mail:http://www.LGEservice.com/techsup.html

CAUTION

BEFORE SERVICING THE UNIT,

READ THE

SAFETY PRECAUTIONS

IN THIS MANUAL.

CHASSIS NO. : LM57G

MODEL:

194

(

194

.A**

QF)

( ) **Same model for Service

Internal Use Only

Summary of Contents for FLATRON W1941S(W1941S-PFT.A***QF)

Page 1: ...ite http biz LGservice com E mail http www LGEservice com techsup html CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS NO LM57G MODEL W1942S W1942S PFT A QF Same model for Service Internal Use Only ...

Page 2: ...pe 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 75 Ω 3 3 Operating Frequency Horizontal 30 83kHz Vertical 56 75Hz 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 6 ENVIRONMENT 6 1 Operating Temperature 10 C 35 C 50 F 95 F 6 2 Rela...

Page 3: ...cuit 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 ...

Page 4: ...fore connecting the test receiver positive lead Always remove the test receiver ground lead last 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 componen...

Page 5: ...h an anti static suction type solder removal device or with solder braid before removing the IC 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 ...

Page 6: ...ut 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 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 defec...

Page 7: ...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 102...

Page 8: ...the latch first Pull the cabinet upwards Then separate all latches on each side Remove the control button from cabinet Then disassemble the connector 1 4 Turn around the base lock to open the lock between base cover and stand body 6 2 3 5 Then separate stand body and base cover 7 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 9: ...OM System EEPROM System 3 3V 1440X900 60Hz 136Mhz Dual Interface Engine Display Processing Engine Response Time Enhancement LVDS Panel Interface OSD Clock Generator MCU DRAM TSUMU58BWHL Flash ROM Flash ROM 3 3V Crystal Crystal 14 318MHz BLOCK DIAGRAM Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 10: ... 2 Power Part This part consists of the one 3 3V and one 1 8V regulators to convert power which 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 ...

Page 11: ... 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 mon...

Page 12: ...serPort sys file to c WINNT system32 drivers folder b Run Userport exe c Remove all default number d Add 300 3FF e Click Start button f Click Exit button 2 EDID Read Write 1 Run WinEDID exe 2 Edit Week of Manufacture Year of Manufacture Serial Number a Input User Info Data b Click Update button c Click Write button Copyright 2007 LG Electronics Inc All right reserved Only for training and service ...

Page 13: ...al 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 d AGING Select Aging mode on off b Module To select applied module d NVRAM INIT EEPROM initialize 24C16 press key for over 3 sec e R G B 9300K Allows you to set the R G B 930...

Page 14: ...CH POWER LINE CHECK U602 1 8V U601 3 3V LINE NO CHECK CRYSTAL X501 YES YES YES CHECK J703 VOLTAGE PIN5 PIN6 5V IS U602 PIN3 3 8V U601 PIN3 3 3V CHECK U501 PIN108 PULSE 1 2 1 3 1 4 Waveforms 1 J703 5 6 2 U602 2 3 U601 2 4 U501 108 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 15: ...O NO NO 1 CONFIRM BRIGHTNESS OSD CONTRL STATUS 2 CHECK MICOM DIM ADJ PORT CHECK J703 PIN10 POWER BOARD LIPS CHECK PULSE AS CONTACTING PROBE TO THE LAMP WIRE OF THE LCD MODULE REPLACE LCD MODULE YES 1 2 3 YES YES YES Waveforms 1 J703 5 6 2 J703 10 3 LAMP CURRENT Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 16: ... 1 8V U601 3 3V U501 PIN 108 109 14 3MHZ CHECK CONNECTION LINE FROM D SUB TO U501 TROUBLE IN CABLE OR LCD MODULE YES YES NO RASTER OSD IS NOT DISPLAYED CHECK U501 PIN27 H SYNC AND PIN28 V SYNC IS PULSE APPEARED AT SIGNAL PINS YES 1 Waveforms 4 U501 108 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 17: ...S GOING INTO DPM MODE NO CHECK H V SYNC LINE NO YES CHECK R730 AND R731 SYNC APPEARED CHECK U501 PIN27 28 SYNC PULSE YES 1 H SYNC 2 V SYNC Waveforms 1 2 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 19: ...EXPLODED VIEW 19 300 320 310 410 420 400 430 910 920 440 200 330 460 450 ...

Page 20: ...28201 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 TLC1DRIVER19INCH1440X900300CDCOLOR72 16 10850 15ms MAGNAsourceD IC OKIgateD IC TLIT con 160 160 P7 LGPHILIPSLCD or EAJ36290802 LCD Module TFT LM190WX1 TLC2DRIVER19INCH1440X900300CDCOLOR72 16 10850 1P7 5ms Non ZBD MAGNAsourceD IC OKIgateD IC ...

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Page 25: ...MAR 2008 P NO MFL32179251 Printed in China ...

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