Zenith XBR413 - Page 48

3-59
VDR ELECTRICAL TROUBLESHOOTING GUIDE
No 3.3V / 2.5V
Check or Replace
the D122
Is there about 3.7V
at the IC154 pin1?
Check the IC154, D153
(2.5V) 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
(To Cap, Drum Motor )
No 5.0V
Check or Replace
the D124
Check the ‘DVD PWR CTL
“H”’ signal from µ-com
Is there about 5.5V
at the IC151 pin1?
Is there about 3.3V~
5V at the IC151 pin4?
Check the IC151
and Replace
NO
NO
YES
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 IC160 pin2?
NO
Check or Replace
the D128
Check the ‘DVD PWR CTL
“H”’ signal from µ-com
NO
NO
YES
Is the ZD151
Normal?
Check the IC160
and Replace
YES
YES
No 12V
Check or Replace
the D125
Is there about 14V
at the IC157 pin1?
Is there about 3.3V ~
5V at the IC157 pin2?
NO
Check the ‘DVD PWR CTL
“H”’ signal from µ-com
NO
YES
Check the IC157
and Replace
YES