LG SNC4R - Optical Function

3-25
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ELECTRICAL TROUBLESHOOTING GUIDE
OPTICAL FUNCTION
Refer to Power Part Troubleshooting
Check IC501 pin65
Input waveform
Check C511
Replace Main PCB
YES
NO
OK
4. OPTICAL FUNCTION
Replace Main PCB
Check R549 3.3VA Voltage
YES
Check JK502
Check R528
YES YES
NO
NO