No External Audio Input - LG RH-2320 Service Manual

8. NO EXTERNAL AUDIO INPUT

< AV3 >
C9F3, C9F4 :
Is there a signal?
Check
cable connections
& input signal.
YES
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Only for training and service purposes
< AV1/AV2>
NO
IC801 pin 2, 3, 5, 6 :
Is there a signal?
YES
IC803 Pin 40, 41 :
Is there a signal?
YES
IC901
Pin 98, 99,100,
95 (Ain_D0,
AIN_SCLK, AIN_FSYNC,
AIN_MCLK) :
Is there
a signal?
YES
When playing DISC,
no audio output
Check
IC801 Pin 14 (12V)
NO
Pin 30 (5, 3V)
Pin 31, 32
(SCL, SDA) :
NO
Check Pin 51/
RST_SAA7138
YES
X901
(24.576MHz)
oscillated?
YES
R906, R909
(SCL/SDA)
YES
IC901 defect
3-13
NO
Replace
IC801
.
Check
NO
IC1302 reset
circuit
NO
Change X901
Check
NO
IC901 power
3.3V & 1.8V
LGE Internal Use Only