One Point Repair Guide; Power On Error - LG S90QY Service Manual

1. POWER ON ERROR

Fundamental power check points.
1-1. 12 V
1) Check 12 VA at WL708.
2) If 12 V is not checked at the point, then find PVDD at pin2 of WIC703.
3) 1), 2) is NG, replace rear kit board.
1-2. 3.3 VA
1) Check 3.3 VA at WL707.
2) If 3.3 VA is not checked at the point, then find 12 VA at pin3 of WIC705.
3) 1), 2) is NG, replace rear kit board

ONE POINT REPAIR GUIDE

WIC703 WIC703
< Rear kit board top view >
< Rear kit board top view >
12 VA 12 VA
PVDD PVDD
12VA 12VA
5-4
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3.3 VA 3.3 VA
WIC705 WIC705
Only for training and service purposes.