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 subwoofer 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 subwoofer board

ONE POINT REPAIR GUIDE

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