Read LG 42SL90QD-SA (CHASSIS:LJ91L) Service Manual online
7. AV Video Trouble Shooting
Y
Y
Check Signal Format
Is it supported signal?
Check AV Cable
Check AV Jack JK209 at Jack
Board
N
Y
Check AV Signal
R203, R204, R214, R215 at Jack
Board
N
Replace one of R203, R204, R214,
R215 at Jack Board
& Recheck
Y
Check AV Signal
C124, C125 at Main Board
N
Replace it
Y
Y
Replace JK209 at Jack board
Maybe BCM3556(IC100)
has problems
Check cable between P203 at Jack
Board and P701 at Main Board
N
Maybe Cable Pin has problems
Y
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