LG DA-W6100A Service Manual page 35

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B.
No disc
.Power on
Does tray open or close?
Does the pick-up
slide inner or outer
track?
Does
the pick-up lens move up
and down?
Slide the pick-up to
inner track.
END
Fig.1. SLED Driver waveform
Fig.2. Focus Driver waveform
Digitized in Heiloo Netherland
Check loading Part.
Push Pick-up to inner track to
the end by hand.
Does
PMD03 Pin10 change
high to low?
Pressing
the open/close key
repeatedly, check the voltage of IC2M1
Pins14, 15 change
0V to 5V
Does
the voltage change
at PMD03 Pins7, 8 more than
2V on the basis of
3.8V?
DECK assembly is defective.
Check SLED Driver output.
IC201 Pin80 IC2M1 Pins28, 29.
Check Focus Driver output.
(IC201 Pin88, IC2M1 Pins37, 38)
- 3-6 -
DECK assembly is defective.
(Limit sw)
check µ-COM Part.
Replace IC2M1.
IC201 Pin80 no output : IC201 is defective
IC2M1 Pins26, 27 no output : IC2M1 is defective
IC201 Pin88 no output : IC201 is defective
IC2M1 Pins37, 38 no output : IC2M1 is defective