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LG CRD-8402B Service Manual page 12

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G. During Audio CD play, LED flickers, but Speaker is silent.
Does PWM signal appear at
IC501 pin
,
,
134 135 142 143
(Refer to Fig. G-1.)
YES
Does Audio signal appear
at IC601 pin
,
3
12
(Refer to Fig. G-2.)
YES
Does "H" signal appear at
IC401 pin
?
25
YES
Does Audio signal appear
at IC701 pin
,
1
YES
Are L-ch, R-ch signals
appear at JK701 and
Audio Line out connector
each?
YES
G-1
28
NO
Replace IC501.
,
?
NO
Is the voltage of IC601
?
pin
9
Replace IC601.
NO
Check the IC401 pin
and then replace IC401.
NO
Is the voltage of IC701
?
pin
7
6
NO
Check JK701 and
L701,L703.
NO
and
2.5V?
8
YES
25
NO
2.5V?
YES
Check C702.
Check the R601, R602
and C602.
Replace IC701.

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