No External Input Audio - LG RH188H Service Manual

8. NO EXTERNAL INPUT AUDIO

< AV3 >
C979, C980 :
Is there a signal?
YES
NO
CHECK Cable connec-
tions & Input signal.
< AV1/AV2 >
NO
IC803 pin 10,16 :
Is there a signal?
YES
NO
IC803 pin 20, 24, 23,
27 : Is there a signal?
YES
NO
IC901 pin 34 Or
R999 (reset"H") :
YES
X901 (24.576MHz)
clock oscillated?
YES
NO
R902,R913,R997 :
R962,R978 (I2C) :
YES
NO
C901 pin 173
or R903 :
YES
When playing DISC,
no Audio output
3-11
CHECK Cable connec-
tions & Input signal.
CHECK IC 803 pin 2,4 (VCC):12V
Pin 32,33 (SCL/SDA):
YES
Replace IC803
CHECK IC1302
Reset Circuit
IC1101 DEFECT
CHECK IC901
power 3.3V & 1.8V
YES
IC901 DEFECT
< AV4 >
C976,C977 :
Is there a signal?
NO
CHECK Cable connec-
tions & Input signal.