LG CRD-8480M Service Manual page 6

C. The Laser of Pick-Up doesn't light.
Is the voltage of IC501 pin
(LD0) 1V?
YES
Check Pick-Up FFC, PN101.
D. The Pick-UP lens doesn't move up and down.
Does the focus search signal
appear at F0S0 (TP9)?
(Refer to Fig. D-1.)
YES
Is the 1.3V at IC201 pin
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YES
Does the focus search signal
appear between F+ (TP10)
and F- (TP11)?
(Refer to Fig. D-2.)
YES
D-1
NO
10
Check Q101, C101, C102
and then replace IC101.
Check the pattern from
NO
IC501 pin
and then replace IC501.
NO
?
Check IC501.
NO
to R225
181
Replace IC201.
23