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42LE5350 (CHASSIS:LA02D) - LG TV Service Manual (repair manual). Page 64

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4. Trouble shooting - No video (AV)
Check input signal format.
Is it supported?
Check AV Cable for damage
for damage or open conductor
Check JK100 , JK8600 CVBS Signal Line
ƒ Rear AV : R105, R904 
ƒ Side AV : R919, R8603
ok
ok
ok
No
Replace Jack
ok
Check CVBS_DET Signal
• Rear AV Detect : R113
• Side AV Detect : R8608
Replace R113 or R8608
No
No
Check FRC and BCM LVDS Output
Replace LGE7378A(IC9001) or LGE3549XS( IC900)
or Main Board.
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