Vdr Part; Vdr Electrical Troubleshooting Guide; Power(Smps) Circuit - LG RC-185 Service Manual

VDR ELECTRICAL TROUBLESHOOTING GUIDE

1. POWER(SMPS) CIRCUIT

No .5.3VA
NO
Is the F101
Normal?
YES
NO
Is the BD101
Normal?
YES
NO
Is the R101
Normal?
YES
NO
Is Vcc (13V - 27V)
supplied to IC101 Pin2?
YES
NO
Is the D123
normal?
YES
NO
Is there about 2.5V
at the IC103 Pin1?
YES
NO
Is the IC102
normal?
YES
NO
Is the D122
Normal?
YES
NO
Is the D126
Normal?
YES

VDR PART

Replace the F101
(Use the same Fuse)
Replace the BD101
Replace the R101
Is the D102
normal?
NO
Check or Replace
the D102
Replace the D123
Replace the IC103
Replace the IC102
Replace the D122
Replace the D126
3-66
YES
NO
Is the D127
Normal?
YES
NO
Is the D128
Normal?
YES
NO
Is the D124
Normal?
YES
Power Line of Main
PCB is short
Replace the D127
Replace the D128
Replace the D124