Read LG 55LH90 (CHASSIS:LA92C) Service Manual online
LA92B-LH40/LH55 Trouble shooting guide – AV/Component/RGB-PC
Audio(In)
Check JK1206, JK1202, JK1205
Can you see the normal waveform?
Can you see the normal waveform?
NO
JK701, JK707, JK700, JK702, JK703 may have problem. Replace this Jack.
Check the input (PinAA3,Y1,AE1,AF3,AE3,AE2,AA1
AB1,AB2,AC2,AB3,AC3) of LGE3159(IC100).
Can you see the normal waveform?
AB1,AB2,AC2,AB3,AC3) of LGE3159(IC100).
Can you see the normal waveform?
NO
YES
After checking audio signal line, you should decide to replace item or not.
YES
Check the Output (Pin Audio_MASTER_CLK ,MS_LRCK
MS_SCK,MS_LRCH) of LGE3159(IC100).
Can you see the normal waveform?
MS_SCK,MS_LRCH) of LGE3159(IC100).
Can you see the normal waveform?
NO
After checking audio signal line, you should decide to replace item or not.
Check IC600(NTP-3100L) L606/L607
YES
NO
After checking audio signal line, you should decide to replace item or not.
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