Read LG 42SL90-UA (CHASSIS:LA92S) Service Manual online
LA92S Trouble shooting guide – TV/CATV
Check TU500 Pin16(SIF)
Can you see the normal signal?
Can you see the normal signal?
Check the input (Pin W2) of LGE3369((IC601).
Measure waveform at C643 because it’s more easy to check.
Can you see the normal waveform?
Measure waveform at C643 because it’s more easy to check.
Can you see the normal waveform?
YES
NO
Could you measure voltage of TU500 & IIC lines?
Are they all normal?
Are they all normal?
NO
You should check power line
& IIC lines.
& IIC lines.
YES
You should replace TUNER.
NO
After checking audio signal line, you should decide to replace item or not.
Audio(In)
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