Zenith XBR411, Manual

Page: 49 / 165

3-61
VDR ELECTRICAL TROUBLESHOOTING GUIDE
No 2.5V
Check or Replace
the D122
Check the ‘DVD PWR CTL
“H”’ signal from µ-com
Is there about 3.8V
at the IC152 pin1?
Is there about 3.3V~
5V at the IC152 pin4?
Check the IC152
and Replace
NO
NO
YES
YES
No 5.0V
Check or Replace
the D124
Is there about 5.5V
at the IC151 pin1?
Is there about 3.3V~ 5V
at the IC151 pin4?
NO
Check the ‘DVD PWR CTL
“H”’ signal from µ-com
NO
YES
Check the IC151
and Replace
YES
No 1.8V
Check or Replace
the D123 Is there about 2.3V
at the IC160 pin1?
Is there about 3.3V ~
5V at the IC60 pin4?
NO
Check the ‘DVD PWR CTL
“H”’ signal from µ-com
NO
Check or Replace
the R167,R168
NO
YES
Are the R167,R168
normal?
YES
Check the IC160
and Replace
YES
Check or Replace
the D124
NO
YES
No 12V
Check or Replace the
D125
Is there about 13.5V
at the IC157 pin1?
Check the IC157 and
Replace
Is there about 3.3V~
5V at the IC157 pin2?
NO
NO
Check the ‘DVD PWR CTL
“H”’ signal from µ-com
YES
YES