No Audio Part - LG CM9730 Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE

3. NO AUDIO PART

CD FUNCTION
Can
disc insert?
YES
Disc reading OK?
YES
IC407
Pin34,35,36 I2S output
signal OK?
YES
IC501
Pin95,96,97 I2S input
signal OK?
YES
A
NO
LOAD +- OK?
Is motor impedance
about 12 Ω?
NO
OPU driving
(Focusing & Tracking) OK?
Check OPU.
(Pick-up module)
IC407
NO
RF & Servo signal
OK?
NO
Check IC501.
3-32
NO
YES
NO
NO
NO
NO
YES
Is motor_open/ close OK?
(IC408 Pin9,10)
YES
Check IC501.
Check Loading motor.
Check IC408.
NO
Focusing/
Tracking/ Sled signal
OK?
YES
PD(CN404 Pin2)
about 180 mV?
Check FFC cable
to CN404, CN405.