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LG Flatron W1943S, Service Manual

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LG Flatron W1943S Service Manual Download Page 8

Disassemble the back cover.

Separate the lamp shield from rear shield.

Please pull off 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

# 6

# 2

# 3

# 5

# 7

- 

8

-

DISASSEMBLY

Copyright 

2007 LG Electronics. Inc. All right reserved.

Only for training and service purposes

LGE Internal Use Only

Change your lock on the product as it follows and turn 

it in the arrow direction. 

Summary of Contents for Flatron W1943S

Page 1: ...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 LM92C MODEL W1943S W1943S V Same model for Service Internal Use Only ...

Page 2: ...nput 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 75 Ω 3 3 Operating Frequency Horizontal 30 83kHz Vertical 56 75Hz 4 MAX RESOLUTION Analog 1360 x 768 60Hz 5 POWER SUPPLY 5 1 Power Adaptor Built in Power Input 12V 2 0A 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: ... Pixels 37 879 1056 800 40 128 88 4 V Lines 40 0 60 317 628 600 1 4 23 800x600 H Pixels 46 875 1056 800 16 80 160 5 V Lines 49 5 75 0 625 600 1 3 21 800x600 H Pixels 49 725 1152 832 32 64 224 6 V Lines 57 283 74 55 667 624 1 3 39 832x624 H Pixels 48 363 1344 1024 24 136 160 7 V Lines 65 0 60 0 806 768 3 6 29 1024x768 H Pixels 60 123 1312 1024 16 96 176 8 V Lines 78 75 75 029 800 768 1 3 28 1024x76...

Page 8: ...en separate all latches on each side Remove the control button from cabinet Then disassemble the connector 1 4 6 2 3 5 7 8 DISASSEMBLY Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only Change your lock on the product as it follows and turn it in the arrow direction ...

Page 9: ... 9 BLOCK DIAGRAM Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 10: ...smitter 2 Power Part This part consists of the one 5V and one 3 3V regulators to convert power which is provided 5V in Adapter 18V is provided for inverter 5V is provided for LCD panel and micom in W1943S case Also 5V is converted 3 3V 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 W1943S c...

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: ...INE CHECK U901 5V LINE NO CHECK U901 3 3V LINE YES YES CHECK J300 VOLTAGE PIN3 12V IS U901 PIN3 5V YES CHECK U901 PIN2 3 3V 1 2 1 3 1 4 Waveforms 1 J300 3 2 U901 3 3 U901 3 4 U901 2 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only YES CHECK U501 PIN127 128 PULSE NO CHECK CRYSTAL X501 ...

Page 15: ...ADJ PORT CHECK U501 PIN117 WAVE FORM ADAPTER CHECK PULSE AS CONTACTING PROBE TO THE LAMP WIRE OF THE LCD MODULE REPLACE LCD MODULE 1 2 YES YES YES Waveforms Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only NO CHECK J300 VOLTAGE PIN3 12V YES CHECK ADAPTER AND FIND OUT A SHORT POINT AS OPENING EACH POWER LINE 5 1 J300 3 2 U901 3 3 Q501...

Page 16: ...N2 3 3V U501 PIN 127 128 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 PIN41 H SYNC AND PIN42 V SYNC IS PULSE APPEARED AT SIGNAL PINS YES 1 Waveforms 1 U501 127 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 R705 AND R706 SYNC APPEARED CHECK U501 PIN41 42 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 18: ...WIRING DIAGRAM 18 6631P00011K ADAPTER MAIN BORAD 30P 6P EAD57188304 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 19: ...EXPLODED VIEW 19 300 320 410 910 920 930 430 440 200 310 330 460 400 ...

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Page 24: ...FEB 2009 P NO MFL61926821 Printed in China ...

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