Electrical Troubleshooting Guide; Power(Smps) Circuit - Zenith ZDX-313 Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE

1. Power(SMPS) CIRCUIT

(1) NNo 5.3VA
No 5.3VA
YES
NO
Is FR101
Normal?
YES
NO
Is BD101
Normal?
YES
NO
Is R101
Normal?
YES
NO
Is Vcc (9V - 18V) sup-
plied to IC101 Pin2?
YES
NO
Are D125
normal?
NO
Is there about 2.5V
at IC103 Pin1?
YES
NO
Is D123
normal?
YES
NO
Is D124
Normal?
YES
NO
Is D121
Normal?
YES
Power Line of Main
PCB is short
Replace FR101
(Use the same ICW)
Replace
BD101
Replace R101
NO
Is D102
normal?
Replace D125
Replace IC103
Replace D123
Replace D124
Replace D121
3-5
Check or Replace
D102