LG SPH5B-W - One Point Repair Guide; Power on Error

4-2
ONE POINT REPAIR GUIDE
1. POWER ON ERROR
Fundamental power check points
1-1. 12 V
1) Check 12 V at WL708.
2) If 12 V is not checked at the point, then find PVDD at pin7 of WIC704.
3) 1), 2) is NG  Replace WIC704.
If you can’t check PVDD voltage, then replace the PCB board.
1-2. 3.3 VA
1) Check 3.3 VA at WL707 coil.
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 WIC705.
If you can’t check 12 VA voltage, following the step 1-1.
< Woofer SMPS & AMP board top view >
< Woofer SMPS & AMP board top view >
WL708
WL708
WIC704
WIC704
WIC705
WIC705
WL707
WL707