LG FB163U Service Manual page 47

B
YES
Laser turns on
when reading
disc?
YES
Put disc in SLOT.
YES
Does SPINDLE
rotate?
YES
C
LGE Internal Use Only
NO
DVDLD or CDLD
output properly?
YES
Collector
voltage of power transistor
is ok? (Q405, Q406)
YES
Check cable connection
between PN4401 and pick-up head.
NO
Laser off.
NO
Proper SPINDLE
signal on ES8390.
YES
SPIN+&SPIN- output
properly?
YES
Check the cable connection
between PN4401 and MD.
3-34
NO
Check the laser power circuit between
ES8390 and power transistor.
(Q405, Q406)
NO
Check the related circuit of laser
power transistor.
NO
Check the SPINDLE related
circuit on SLOT.
NO
Check the SPINDLE control of
motor driver ES8390.
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes