Electrical Troubleshooting Guide; Power Supply (Smps) - LG BD390 Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE

1. POWER SUPPLY (SMPS)

No .5.3VA
YES
Is the F101 normal?
YES
Is the BD101 normal?
YES
Is the R101 normal?
YES
Is Vcc (13V~27V)
supplied to IC101
Pin4?
YES
Is the D124 normal?
YES
Is there about 2.5V
at the IC103 Pin1?
YES
Is the IC102 normal?
YES
Is the D123 normal?
YES
Is the D121 normal?
YES
Is the D132 normal?
YES
Is the D125 normal?
YES
Is the D126 normal?
YES
Power line of main PCB is short
NO
Replace the F101 (Use the same fuse)
NO
Replace the BD101
NO
Replace the R101
NO
Is the D102 normal?
Check or replace the D102
NO
Replace the D124
NO
Replace the IC103
NO
Replace the IC102
NO
Replace the D123
NO
Replace the D121
NO
Replace the D132
NO
Replace the D125
NO
Replace the D126
3-38
NO