Zenith XBR411 - Power(Smps) Circuit; Vdr Part

3-60
VDR ELECTRICAL TROUBLESHOOTING GUIDE
1. Power(SMPS) CIRCUIT
No 3.8VA
Replace the F101
(Use the same Fuse)
Is the F101
Normal?
Is the TH01
Normal?
Is the BD101
Normal?
NO
NO
NO
NO
NO
NO
NO
NO
NO
Replace the BD101
Replace the TH01
Is the D104
normal?
Check or Replace
the D104
Replace the D122
Replace the IC106
Replace the D123
Replace the D124
Replace the D125
YES
YES
YES
YES
YES
YES
YES
YES
YES
Is Vcc (11V - 18V)
supplied to IC101 Pin3?
NO
Are the D122
normal?
Is there about 2.5V
at the IC106 Pin1?
Is the D123
normal?
Is the D124
Normal?
Is the D125
Normal?
Power Line of Main
PCB(VDR) is short
VDR PART
No 3.3V
Check or Replace
the D122
Is there about 3.8V
at the IC154 pin1?
Check the IC154 and
Replace
Is there about 3.3V~ 5V
at the IC154 pin4?
NO
NO
Check the ‘DVD PWR CTL
“H”’ signal from µ-com
YES
YES