LG BD630N Service Manual page 59

ELECTRICAL TROUBLESHOOTING GUIDE
No 5 V
YES
Is the
Vcc 5.3 VA supplied to IC104
pin2, 3?
YES
Is there
3.3 V at IC104
pin4?
YES
Check soldering
connector CN301.
No 12 VA
YES
Is the Vcc
supplied to D126 & D130
anode?
YES
Is the
D126 & D130 output
12 VA?
YES
Check soldering
connector CN301.
NO
Check 5.3 VA on SMPS.
Check
NO
signal IC104
pin?
Replace IC104.
NO
Check SMPS primer side.
NO
D126 & D130 OK?
C123 OK?
3-44
NO
YES
NO
YES
YES
Check voltage on IC501.
Check or replace
D126 & D130.
Check or replace C123.