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

VCR 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 TH01
Normal?
YES
NO
Is the Vcc (11V - 18V)
supplied to IC101 Pin2?
YES
NO
Is the D121
normal?
YES
NO
Is there about 2.5V
at the IC103 Pin1?
YES
NO
Is the D126
normal?
YES
NO
Is the D129
normal?
YES
NO
Is the D130
normal?
YES
Replace the F101
(Use the same Fuse)
Replace the BD101
Replace the TH01
Is the D102
normal?
NO
Check or Replace
the D102
Replace the D121
Replace the IC103
Replace the D126
Replace the D129
Replace the D130
3-4
YES
NO
Is the D127
normal?
YES
NO
Is the D128
normal?
YES
Power Line of Main
PCB(VCR) is short
Replace the D127
Replace the D128