LG 47SL90QD - Page 40

Copyright ⓒ 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
2. No OSD Trouble Shooting
Replace Power board
NY
Check 12V Voltage Level
at P801 #13 Pin
Check Power connector
Y
Check 12V Voltage Level at L909
N
Replace one of
Q802/Q803/Q804/L801
& Recheck
Y
Check P903
#16(TXAC-), #17(TXAC+),
#32(TXBC-), #33(TXBC+)
Y
Check LVDS Cable
N
Replace Cable
Y
Check Voltage LCD Module
Check 12V Voltage Level
at L801
N
Replace one of L801/Q804
& Recheck
Y
Maybe BCM3556(IC100) or
7329A(IC901)
has troubles
Check Voltage Level 2.5V at L827
N
Replace one of IC803/L824/L827
& Recheck
Y
Check Voltage Level 1.8V
at IC802 #2 pin or L815
N
Replace one of IC802/IC805/L815
& Recheck
Y
Check Voltage Level 1.26V
at IC807 #6 pin
N
Y
N
Replace IC807
& Recheck