Service Manual LCD TV LG 20LC1R

TROUBLESHOOTING

1. No power (LED indicator off)

- Check short of main B/D or Change Lips Change U406 Change LED Assy Check 15V or 5V of Lips Check Output of U406 Check LED Assy Check J103, J125, J126 Connector Fail Fail Check Output of Change Q402 Q402 Fail Pass Fail Pass Pass Pass :[A]Process

2. No Raster 

- Check LED Status on display unit Check the input/ Output of U301 Check U401~U405, U407, U409 Check inverter Connector or inverter Check input source cable and jack Repeat A PROCESS Fail Change U401~U405, Fail U407, U409 Change U301 Fail Change inverter Fail connector or inverter Change panel link Fail cable or module Check panel link Cable or module

3. No Raster on AV Signal (SCART, CVBS, S-VHS)

No Raster on TV(RF) signal

Change L108, L109, L110, L112, R194, R198, R184

Check the signal of L108, L109, L110, L112 R194, R198, R184

Repeat

[A] Process Check the output of TU701 Check the input/output of U301 Check the input/output of U101 Check input source cable and jack Re-soldering or Change the defect part Check X301 Fail Re-soldering or Change the defect part Check 5V, 33V of TU701 Re-soldering or Change the defect part

4. No Sound

Check the speaker wire Change source input Check the input source Fail Pass Re-soldering or Change the defect part Check X301 Check the input/output of U301 Fail Pass Re-soldering or Change the defect part Check the input/output of U201 Fail Pass Check the speaker Change speaker

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