Power On Error - LG LAS551H Service Manual

2. POWER ON ERROR

Fundamental power check points
2-1. 12 V
1) Check 12 V at WL604 nearby WL603 coil.
2) If 12 V is not checked at the point, then find PVDD at pin7 of WIC606.
3) 1), 2) is NG  Replace WIC606.
If you can't check PVDD voltage, then you replace woofer SMPS board.
PVDD PVDD
at pin7 of WIC606 at pin7 of WIC606
2-2. 3.7 VA
1) Check 3.7 VA at WL606 coil.
2) If 3.7 VA is not checked at the point, then find PVDD at pin7 of WIC607.
3) 1), 2) is NG  Replace WIC607.
If you can't check PVDD voltage, then you replace woofer SMPS board.
PVDD PVDD
at pin7 of WIC607 at pin7 of WIC607
ONE POINT REPAIR GUIDE
< Woofer AMP board top view >
3.7 VA 3.7 VA
at WL606 at WL606
< Woofer AMP board top view >
12 V 12 V
at WL604 at WL604
4-3