LG LAS454B Service Manual page 53

3. POWER ON ERROR
MAIN SoC IC supply voltage check points
3-1. 3.3 VA
1) Check 3.3 VA at WCA603 and WL627.
2) Check 3.3V_PWM at pin5 of WIC605.
3) Check 3.3 VA at pin7, 8 of WIC603.
4) Check 3.3V_PWM at WL615 nearby WIC601.
If all voltages are OK, then check the PVDD voltage of woofer SMPS board.
3.3 VA 3.3 VA
at pin7, 8 of WIC603 at pin7, 8 of WIC603
ONE POINT REPAIR GUIDE
at WCA603, WL627 at WCA603, WL627
3.3V_PWM 3.3V_PWM
at pin5 of WIC605 at pin5 of WIC605
< Woofer AMP board top view >
3.3 VA 3.3 VA
3.3V_PWM 3.3V_PWM
at WL615 at WL615
4-4