LG S55A3-D Service Manual

4-3
ONE POINT REPAIR GUIDE
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.
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.
< Woofer AMP board top view >
< Woofer AMP board top view >
12 V
12 V
at WL604
at WL604
PVDD
PVDD
at pin7 of WIC606
at pin7 of WIC606
3.7 VA
3.7 VA
at WL606
at WL606
PVDD
PVDD
at pin7 of WIC607
at pin7 of WIC607

LG S55A3-D Specifications

General

Brand	LG
Model	S55A3-D
Category	Speaker System
Language	English