
3-18
Put disc in tray.
Laser off
Check the laser power circuit
between ES8380 and power
transistor. (Q405, Q406)
Laser
turns on when
reading disc?
DVDLD
or CDLD output
properly?
NO
NO
NO
YES
Check the related circuit of
laser power transistor.
Collector
voltage of power
transistor is OK?
(Q405, Q406)
NO
YES
YES
YES
B
C
Check cable connection
between P400 and
pick-up head.
Check the SPINDLE related
circuit on ES8380
Does SPINDLE
rotate?
Proper
SPINDLE signal
on ES8380.
NO
Check the SPINDLE control
of motor driver.
SPIN+ &
SPIN- output
properly?
NO
NO
YES
YES
YES
Check the cable
connection between
P400 and MD
ELECTRICAL TROUBLESHOOTING GUIDE OF DVD PART
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only