LG S55A3-D

3-3
ONE POINT REPAIR GUIDE
2. POWER ON ERROR
No display or Not working.
2-1. IC603
1) Check 12 VA at L604.
2) If 12 VA is not checked at the point, then find 24 V at pin7 of IC603.
3) 1), 2) is NG.  Replace IC603.
2-2. IC606
1) Check 3.3 VA at L618.
2) If 3.3 VA is not checked at the point, then find 12 V at pin5 of IC606.
3) 1), 2) is NG.  Replace IC606.
2-3. Q601
1) Check 12 V at the Collector of Q601 (pin2).
2) If 12 V is not checked at the point, then find 11 V at the Base of Q601 (pin3).
3) 1), 2) is NG.  Replace Q601.
< MAIN board top view >
< MAIN board top view >
< MAIN board top view >
L604
L604
L618
L618
Q601
Q601
pin2 (collector),
pin2 (collector),
pin3 (base)
pin3 (base)
IC603 pin7
IC603 pin7
IC606 pin5
IC606 pin5