Read LG 47SL90-UA (CHASSIS:LA92S) Service Manual online
LA92S Trouble shooting guide – AV/Component/RGB-PC
Audio(In)
Check JK100, JK101, JK102, JK103 on main PCB and JK101
on Side AV PCB Can you see the normal waveform?
on Side AV PCB Can you see the normal waveform?
NO
JK100, JK101, JK102, JK103 on main PCB and JK101 on Side AV PCB
may have problem. Replace this Jack.
Check the input (PinAA3,Y1,AE1,AF3,AE3,AE2,AA1
AB1,AB2,AC2,AB3,AC3) of LGE3369(IC601).
Can you see the normal waveform?
AB1,AB2,AC2,AB3,AC3) of LGE3369(IC601).
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 LGE3369(IC601).
Can you see the normal waveform?
MS_SCK,MS_LRCH) of LGE3369(IC601).
Can you see the normal waveform?
NO
After checking audio signal line, you should decide to replace item or not.
Check IC301(NTP-3100L) L304/L305
YES
NO
After checking audio signal line, you should decide to replace item or not.
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