LG XH-T3029S Service Manual page 32

C
Laser turns on when
reading disc?
Yes
Put disc in?
Yes
Disc ID is correct?
Yes
Does spindle rotate?
Yes
D
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DVDLD or
No
CDLD output
property?
Yes
Collector
voltage of power
transistor is OK?
(Q405, Q406)
Yes
Check cable connection
between transistor output and
pick-up head.
No
Laser off.
Proper
No
RF signal on ES8380.
Yes
Check the RF connection
between IP9009 and ES8380.
Proper
No
SPINDLE signal on
ES8380.
Yes
SPNP
SPNN output
properly?
Yes
Check the cable connection
between spindle and main PCB.
3-5
Check the laser power circuit on
No
ES8380 and connecting to
power transistor.(Q405, Q406).
No
Check the related circuit on laser
power transistor.
No
Check the related circuit on
ES8380 RF signal.
No
Check the SPINDLE related circuit
on ES8380.
No
Check the spindle control amp circuit
of motor driver.
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