LG CJS98F User Manual

3-27
ELECTRICAL TROUBLESHOOTING GUIDE
No AMP output
Check PFC P.CTL
from μ-com.
Check AMP P.CTL
from μ-com.
Replace D908, Q955, PC903.
Replace D908, Q956, PC902.Replace F911.
Check or replace
IC904, Q907 ~ Q910.
Check or replace IC902 and
check Q905, Q906 gate(pin1)
Components (Resistors, Diodes).
Is Q905, Q906 OK?
Replace Q905, Q906.
Check or replace D954, D955.
Check line of MAIN PCB is short or not.
Is the
C904 voltage
about 390 V?
Is F911 normal?
Is the
PFC P.CTL OK?
Is the
AMP P.CTL OK?
Is the
VCC 12 V supplied to
IC904 pin16?
Is the
VCC 12 V supplied to
IC902 pin2?
NO
YES
NO
NO
NO
NO
YES
NO
YES
YES
YES
YES
NO
NO
POWER SUPPLY ON SMPS BOARD

LG CJS98F Specifications

General

Brand	LG
Model	CJS98F
Category	Stereo System
Language	English