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26LN41XX, 26LN4100, 26LN4110, 26LN4130, 26LN4140 (CHASSIS:LM91M) - LG TV Service Manual (repair manual). Page 21

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9. Abnormal sound (AV)-Main PCBA
Put into AV cable completely?
Abnormal sound (AV)
YES
NO
Insult AV cable tight
1
Change IC501
WAVEFORMS
Is waveform at C520,C521
2
Check Line between JK101 and IC501
is open or short,  Another is 
change AV cable
NO
YES
C520,C521(audio  in)
2
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