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22LN4000 (CHASSIS:LM91N) - LG TV Service Manual (repair manual). Page 14

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5. Abnormal screen (AV)-Main PCBA
wœ›G•›–Gh}GŠˆ‰“ŒGŠ–”—“Œ›Œ“ f
Abnormal screen (AV)
YES
NO
NO
Insult AV cable tight
1
Change IC600
WAVEFORMS
pšGp•—œ›G šŽ•ˆ“G›”•ŽG
ˆ•‹G–™”ˆ›G •Gš—ŒŠf
Change Timing to 480I, 576I 
Or change format CVBS
2
pšGžˆŒ–™”G ˆ›Gy]\X
3
Check Line between JK101 and IC600
is open or short,  Another is 
change AV cable
NO
YES
YES
y]\XGOj}izP
3
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