Read LG 55LH90 (CHASSIS:LA92C) Service Manual online
LH40/LH55 Trouble shooting guide – TV/CATV
Check TU1 Pin16(SIF)
Can you see the normal signal?
Can you see the normal signal?
Check the input (Pin W2) of LGE3159((IC100).
Measure waveform at C147 because it’s more easy to check.
Can you see the normal waveform?
Measure waveform at C147 because it’s more easy to check.
Can you see the normal waveform?
YES
NO
Could you measure voltage of TU1001 & 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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