LG CM8440 Series - Audio Part

3-30
ELECTRICAL TROUBLESHOOTING GUIDE
CD FUNCTION
Check FFC cable
to CN404, CN405.
Is motor_open/ close OK?
(IC408 Pin6, 7)
Check IC408.
MON_MPD(CN404 Pin22)
about 180 mV?
Check IC501.
Check Loading motor.
Check IC501.
OPU driving
(Focusing & Tracking) OK?
Check OPU.
(Pick-up module)
Is motor impedance
about 12 Ω?
IC407
Pin51, 52, 53 I2S output
signal OK?
Can
disc insert?
IC501
Pin N1, N2, N4 I2S input
signal OK?
Disc reading OK?
NO
NO
NO
NO
NO
NO
NO
NO
NO
IC407
RF & Servo signal
OK?
Focusing/
Tracking/ Sled signal
OK?
LOAD +, - OK?
YES
YES
YES
YES
YES
NO
YES
YES
YES
A
3. NO AUDIO PART