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42LC5DC (CHASSIS:LA65A) - LG TV Service Manual (repair manual). Page 26

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RGB Video Trouble Shooting
Check signal format
Is it supported?
Check signal, Hsync, Vsync
R545, R546, R548, R1549, R1550
Replace it.
Check signal
R557, R560, R562
Y
N
Check P1302
Replace connector
Y
N
Y
Replace it
N
Maybe FI-8668(IC506) has 
problems
Y
Check RGB Cable
Y
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