Read LG 50PT490B-SA / 50PT490B-SD (CHASSIS:PB11K) Service Manual online
12. Component / RGB / AV Audio Trouble Shooting
Y
Check Jack JK1001/JK1002/P900
N
Y
Check Signal
C206/C207/C208/C209/C210/C211
C212/C220/C221/C222/C223/C224
C225/C205/R166/R167/R168/R169
R170/R171/R127/C215/C216/C203
C217/C218/C219/C204/R187/R188
C212/C220/C221/C222/C223/C224
C225/C205/R166/R167/R168/R169
R170/R171/R127/C215/C216/C203
C217/C218/C219/C204/R187/R188
C226/C227
N
Replace Jack
Check Video Output
Replace one of
C206/C207/C208/C209/C210/C211
C212/C220/C221/C222/C223/C224
C225/C205/R166/R167/R168/R169
R170/R171/R127/C215/C216/C203
C217/C218/C219/C204/R187/R188
C226/C227 & Recheck
C212/C220/C221/C222/C223/C224
C225/C205/R166/R167/R168/R169
R170/R171/R127/C215/C216/C203
C217/C218/C219/C204/R187/R188
C226/C227 & Recheck
N
Follow procedure external input
video trouble shooting
Y
Follow procedure All source audio
trouble shooting
N
Maybe Mstar S7 audio block has
problems. Replace It
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