LG LGXBR342 Service Manual page 49

VDR ELECTRICAL TROUBLESHOOTING GUIDE
(To Cap, Drum Motor )
No 3.3V / 2.5V
NO
Is there about 3.7V
at the IC154 pin1?
YES
NO
Is there about 3.3V ~
5V at the IC154 pin4?
YES
Check the IC154, D153
(2.5V) and Replace
No 1.8V
NO
Is there about 2.3V
at the IC160 pin1?
YES
NO
Is there about 3.3V ~
5V at the IC160 pin2?
YES
NO
Is the ZD151
Normal?
YES
Check the IC160
and Replace
Check or Replace
the D122
Check the 'DVD PWR CTL
"H"' signal from µ-com
Check or Replace
the D123
Check or Replace
the D128
Check the 'DVD PWR CTL
"H"' signal from µ-com
No 5.0V
Is there about 5.5V
at the IC151 pin1?
YES
Is there about 3.3V~
5V at the IC151 pin4?
YES
Check the IC151
and Replace
No 12V
Is there about 14V
at the IC157 pin1?
YES
Is there about 3.3V ~
5V at the IC157 pin2?
YES
Check the IC157
and Replace
3-59
NO
Check or Replace
the D124
NO
Check the 'DVD PWR CTL
"H"' signal from µ-com
NO
Check or Replace
the D125
NO
Check the 'DVD PWR CTL
"H"' signal from µ-com