Troubleshooting Guide - LG CB777G Service Manual

NO POWER
(POWER INDICATOR OFF)
CHECK
FUSE OK?
YES
CHECK
C908 VOLTAGE?
(AC120V: 160VDC,
AC220V: 304VDC)
YES
CHECK
IC901 PIN 6
WAVEFORM
(SQUARE WAVE
COMES OUT?)
YES
CHECK
D941, D942, D951, D961,
D962, D971
VOLTAGE?
YES
TROUBLE IN
Q903, Q952,
Q951, Q942, Q941

TROUBLESHOOTING GUIDE

1. NO POWER
NO
NO
NO
NO
- 13 -
TROUBLE IN FUSE
(F901)
TROUBLE IN
D900
TROUBLE IN
IC901
TROUBLE IN
D941, D942, D951,
D961, D962, D971