Read LG 55LH90 (CHASSIS:LA92C) Service Manual online
LA92B-LH40/LH55 Trouble shooting guide – SPDIF
Audio(Out)
Check the output (Pin E9) of LGE3159(IC100).
Measure waveform at R159 because it’s more easy to check.
Can you see the normal signal?
Measure waveform at R159 because it’s more easy to check.
Can you see the normal signal?
Check the input of JK601.
Can you see the normal waveform?
Can you see the normal waveform?
YES
NO
NO
This board has big problem because Main chip(LGE3159) have some troubles.
After checking thoroughly all path once again, You should decide to replace LGE3159 or not.
After checking thoroughly all path once again, You should decide to replace LGE3159 or not.
After checking audio signal line, you should decide to replace item or not.
YES
After checking the Jack, you should decide to replace item or not.
Click on the first or last page to see other 55LH90 (CHASSIS:LA92C) service manuals if exist.