LG MBD-D102X Service Manual page 30

ELECTRICAL TROUBLESHOOTING GUIDE OF DVD PART
C
Focus on OK?
YES
Track on OK?
YES
Disc play?
YES
D
Proper
NO
signal on A, B, C, D
from MD?
Proper
FOO signal on
IC401?
Check cable connection
between P400 and MD.
Proper
NO
TRO signal on
IC401?
T+ & T- output
properly?
Check cable connection
on pick-up head.
NO
Check RF signal
waveform.
3-19
NO
YES
NO
YES
NO
YES
NO
YES
Check the connections between
P400 and pick-up head.
Check the related circuit of
ES8380 focus signal.
Check the related circuit
between IC401 and ES8380
Check the tracking control
on motor driver (IC401).