LG OM7550 - Audio Check

3-29
ELECTRICAL TROUBLESHOOTING GUIDE
CD FUNCTION
Check FFC cable
to CN400, CN401.
Is Motor_open/ close OK?
(IC400 pin6, 7)
Check IC400.
MON_MPD(CN400 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?
IC401 pin34, 35, 36
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
IC401
RF & Servo signal
OK?
Focusing/
Tracking/ Sled signal
OK?
LOAD +, - OK?
YES
YES
YES
YES
YES
NO
YES
YES
YES
A
3. NO AUDIO CHECK