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19LN4050 (CHASSIS:LB35A) - LG TV Service Manual (repair manual). Page 17

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8. Abnormal sound (AV)-Main PCBA
wœ›G•›–Gh}GŠˆ‰“ŒGŠ–”—“Œ›Œ“ f
Abnormal sound (AV)
YES
NO
Insult AV cable tight
1
Change IC501
WAVEFORMS
pšGžˆŒ–™”G ˆ›Gj\YWSj\YX
2
Check Line between JK101 and IC501
is open or short,  Another is 
change AV cable
NO
YES
j\YWSj\YXOˆœ‹–G •P
2
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