Read LG 42PB4DTH-UB / CHASIS / PA72A Service Manual online
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1. Check follow
1-1. Execution PIP or D/W mode
TV
Is normal the main of D/W MODE when you
execution TV/TV mode ?
Is normal the sub of D/W MODE when you
execution TV/DTV mode ?
Is it 5V #6 output of TUNER ( TU1302) ?
Is it 33V #8 output of TUNER(TU1302) ?
Is normal # 16 output of TUNER(TU1302) ?
Replace the TUNER(TU1302) ..
Is it 5V #3,#11 output of TUNER(TU1300) ?
Check the IIC Control (TU1300) ?
Is normal #16 output of TUNER(TU1300) ?
Replace the TUNER(TU1300) .
NO
No
NO
YES
YES
No
YES
YES
DCR DVR RF MODE (Detailed)
(TV/CATV mode does not display .)
Check the IIC Control (TU1302) ?
YES
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