Audio Part - LG CMS9540F Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE
3. NO AUDIO PART
CD FUNCTION
Can
disc insert?
YES
Disc reading OK?
YES
IC407
Pin51, 52, 53 I2S output
signal OK?
YES
IC501
Pin N1, N2, N4 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.
3-30
NO
YES
NO
NO
NO
NO
YES
Is motor_open/ close OK?
(IC408 Pin6, 7)
YES
Check IC501.
Check Loading motor.
Check IC408.
NO
Focusing/
Tracking/ Sled signal
OK?
YES
MON_MPD(CN404 Pin22)
about 180 mV?
Check FFC cable
to CN404, CN405.