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3-10
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
When playing DISC, no Audio output
Replace IC902
IC902 Pin 1, 7 :
Is there a signal
Check
IC902 Pin 8
(12VT)
Check
IC904 Pin 5, 6,
7, 8 :
.
Pin 3, 4 (Host CLK
& DATA) :
NO
NO
YES
YES
IC1101 defect
5. WHEN PLAYING DISC, NO AUDIO OUTPUT
IC904 Pin 14, 15 :
Is there a signal?
Check
IC801 Pin 14
(12V) Pin 30 (5, 3V)
Pin31, 32
(SCL, SDA) :
NO
NO
Replace
IC801
IC801 Pin 34, 35,
37, 38 : Is there
a signal?
NO
NO
YES
L804, L808,
L820, L821 :
Is there a signal?
YES
YES
YES
YES
Check
Q808, Q809, Q810, Q801
Check
cable connections &
TV audio mute.
Check
IC904 Pin 11 (5VD)
YES
Replace IC904
IC904 Pin 1, 16
(Z_MUTE R/L) :
.
IC701 Pin 24
(A_MUTE_L) :