Zenith XBV443 - Electrical Troubleshooting Guide; Power(Smps) Circuit

3-4
ELECTRICAL TROUBLESHOOTING GUIDE
NO
Check or Replace
the D102.
Replace the D111.
Replace the D110.
Replace the D113.
YES
YES
Is the D113 normal?
Power Line of Main
PCB is short.
1. Power(SMPS) CIRCUIT
NO 5.3VA.
Replace the F101.
(Use the same Fuse)
Is the F101 normal?
Is the R101
normal?
Is the BD101
normal?
NO
NO
NO
NO
NO
NO
NO
NO
NO
Replace the
BD101.
Replace the R101.
Is the D102
normal?
Replace the D118
(MTK)/D112(ST).
Replace the IC103.
YES
YES
YES
YES
YES
YES
YES
Is Vcc(9V~18V) sup-
plied to IC101 Pin2?
Are the D118 (MTK)
/D112(ST) normal?
Are the about 2.5V
at the IC103 Pin1?
Is the D111 normal?
Is the D110 normal?
(1) No 5.3VA (SYS/Hi-Fi/TUNER)