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LG E1942S, Service Manual, Page: 14 / 21

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LG E1942S Service Manual Download Page 14

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3

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TROUBLESHOOTING GUIDE

1. NO POWER

NO POWER

(POWER INDICATOR OFF)

CHECK IC103

NO

NO

NO

CHECK CRYSTAL(X100)

YES

YES

YES

1

2
13

14

Waveforms

1        

2      

3       

4

Copyright 
Only for training and service purposes

LGE Internal Use Only

2010 LG Electronics. Inc. All right reserved.

1.2V

CHECK 

IC102  PIN3(5V)

IS IC103 PIN25(3.3V) 

PIN27(1.2V)

CHECK IC103 PIN 42,43

PULSE

CHECK ADAPTER(19V)

CHECK IC102 PIN3 (5V)

IC102 PIN3 (5V)

IC103  PIN27 (1.2V)

IC103 PIN 25 (3.3V)

IC103 PIN42,43

Summary of Contents for E1942S

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 LM12A MODEL Same model for Service Internal Use Only E1942S E1942S A ...

Page 2: ...V DLP LCD Projector Repair Membership Site Troubleshooting Repairing LCD TV Guide Plasma TV Repair Guide Display Fault Troubleshooting Basic LCD TV Repair Secrets Revealed LCD Monitor Repair Guide Vol 1 10 Trus Repair Case Histories of LCD Monitor SMPS Switch Mode Power Supply Repair Guide Testing Electronic Components like a Pro For Beginner Laptop Motherboard Repair Course Laptop Repair Video Co...

Page 3: ... 240 V 50 60 Hz 1 0A 5 2 Power Consumption 6 ENVIRONMENT 6 1 Operating Temperature 10 C 35 C 50 F 95 F 6 2 Relative Humidity 10 80 Non condensing 6 3 MTBF 30 000 HRS with 90 Confidence level Lamp Life 30 000 Hours Min 7 DIMENSIONS with TILT Width 44 1 cm 17 36 Depth 16 8 cm 6 61 Height 34 9 cm 13 7 8 WEIGHT with TILT SWIVEL Net Weight 2 1 kg 4 62 lbs Gross Weight 3 2kg 7 04 lbs SPECIFICATIONS MODE...

Page 4: ...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 5: ...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 6: ...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 7: ...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 8: ...5 175 59 94 525 480 10 2 33 640 x 480 H Pixels 37 5 840 640 16 64 120 3 V Lines 31 5 75 500 480 1 3 16 640 x 480 H Pixels 37 879 1056 800 40 128 88 4 V Lines 40 0 60 317 628 600 1 4 23 800 x 600 H Pixels 46 875 1056 800 16 80 160 5 V Lines 49 5 75 0 625 600 1 3 21 800 x 600 H Pixels 49 725 1152 832 32 64 224 6 V Lines 57 283 74 55 667 624 1 3 39 832 x 624 H Pixels 48 363 1344 1024 24 136 160 7 V L...

Page 9: ...t the front face down Disassemble back cover DISASSEMBLY Set Place the monitor face Down on the cushion or soft cloth Remove the stand body and atand base from the product Copyright 2010 LG Electronics Inc All right reserved LGE Internal Use Only Only for training and service purposes ...

Page 10: ... 9 BLOCK DIAGRAM Copyright Only for training and service purposes LGE Internal Use Only 2010 LG Electronics Inc All right reserved m a r g a i D k c o l B E1942C S LED Panel 19 Inch ...

Page 11: ...mitter 2 Power Part TThis part consists of one regulator convert power From 19V to 5V 19V is provided by adapter 5V is provided for LCD panel Also 5V is converted 3 3V by regulator Converted Power is provided for IC in the main board 3 MICOM Part This part is include video controller part And this part consists of Flash IC which stores control data and the Micom The Micom distinguishes polarity an...

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 Only for training and service purposes LGE Internal Use Only 2010 LG Elec...

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: ... 3 1 4 Waveforms 1 2 3 4 Copyright Only for training and service purposes LGE Internal Use Only 2010 LG Electronics Inc All right reserved 1 2V CHECK IC102 PIN3 5V IS IC103 PIN25 3 3V PIN27 1 2V CHECK IC103 PIN 42 43 PULSE CHECK ADAPTER 19V CHECK IC102 PIN3 5V IC102 PIN3 5V IC103 PIN27 1 2V IC103 PIN 25 3 3V IC103 PIN42 43 ...

Page 15: ... Only for training and service purposes LGE Internal Use Only 2010 LG Electronics Inc All right reserved CHECK IC103 PIN25 3 3V PIN27 1 2V IC103 PIN42 43 CHECK IC103 PIN36 V SYNC And PIN35 H SYNC CHECK IC102 PIN3 5V IC504 1 2V 1 CHECK PIN 42 43 SOLDERING CONDITION 2 CHECK X100 3 TROUBLE IN IC103 CHECK CONNECTION LINE FROM D SUB TO IC103 ...

Page 16: ...S GOING INTO DPM MODE NO CHECK H V SYNC LINE NO YES YES 1 H SYNC 2 V SYNC Waveforms 1 2 Copyright Only for training and service purposes LGE Internal Use Only 2010 LG Electronics Inc All right reserved CHECK P300 PIN13 HSYNC PIN14 VSYNC CHECK IC103 PIN35 36 SYNC PULSE ...

Page 17: ...NG DIAGRAM 16 Copyright Only for training and service purposes LGE Internal Use Only 2010 LG Electronics Inc All right reserved EAD38438703 6631900011S EAD61426311 AUO EAD61905268 CMI EAD61905281 MAIN BOARD ...

Page 18: ...2010 300 500 510 520 530 400 900 200 540 410 or ...

Page 19: ...PDF created with pdfFactory Pro trial version www pdffactory com ...

Page 20: ...PDF created with pdfFactory Pro trial version www pdffactory com ...

Page 21: ...JANUARY 2012 P NO Printed in China MFL67122126 ...

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