5-4
C
Laser turns
on when reading
disc?
DVDLD or CDLD
output properly?
Check cable connection
between P400 and
pick-up head.
Laser off.
Proper SPINDLE
signal on ES8380.
SPIN+&SPIN-
output properly?
Check the cable
connection between
P400 and MD
Check the SPINDLE control of motor driver
(IC404).
Check the SPINDLE related
circuit on ES8380
Check the related circuit of laser
power transistor.
Check the laser power circuit between
ES8380 and power
transistor. (Q405,Q406)
Collector
voltage of power
transistor is ok?
(Q405,Q406)
Put disc in tray.
Does SPINDLE
rotate?
D
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only