Audio Check - LG OK99 Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE
3. NO AUDIO CHECK
CD FUNCTION
Can
disc insert?
YES
Disc reading OK?
YES
IC401 pin34, 35, 36
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)
IC401
NO
RF & Servo signal
OK?
NO
Check IC501.
3-28
NO
YES
NO
NO
NO
NO
YES
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Is Motor_open/ close OK?
(IC400 pin6, 7)
YES
Check IC501.
Check loading motor.
Check IC400.
NO
Focusing/
Tracking/ Sled signal
OK?
YES
MON_MPD(CN400 pin22)
About 180 mV?
Check FFC cable
to CN400, CN401.
Only for training and service purposes.