No External Input 2 Audio - LG RH4820W Service Manual

9. No external input 2 audio

Audio output even when
Playing Disc
YES
IC808, 809 - 7
Check audio signal output
YES
IC808, 809-3
Check audio signal input
YES
IC804 - 23, 27
Check audio signal output
YES
IC804 – 8,14
Check audio signal input
YES
END
NO
When playing DISC , no
audio output> check
NO
IC808, 809 (AUDIO SWITCH) Power and switching operation
Pin 2, 4 High/Low =>pin 7 output : SW_A_OUT_L/R
NO
Check IC808,809 signal
flow and power
NO
IC804 – 9:LOW?
HIGH: AUDIO MUTE
YES
Q803 2(Emitter ) High?
YES
IC702 - 46
LOW:AUDIO MUTE
NO
JK803-23, 27
Check input
3-9
NO
IC804 - 32, 33
Check I 2 C signal flow
NO
IC804 - 32, 33
Check signal flow