LG SH5B Service Manual page 24

2. POWER ON ERROR
No display or Not working.
2-1. IC608
1) Check 12 VA at L604.
2) If 12 VA is not output, check 25 VA at pin2 of IC608.
3) 1), 2) is OK.  Replace IC608.
2-2. IC605
1) Check 5.1 VA at L603.
2) If 5.1 VA is not output, check 12 VA at pin3, 5 of IC605.
3) 1), 2) is OK.  Replace IC605.
ONE POINT REPAIR GUIDE
< MAIN board top view >
L603 L603
< MAIN board top view >
IC605 IC605
3-3
L604 L604
IC608 IC608