No External Input 3 Audio; No External Input 4 Audio - LG RH4820W Service Manual

10. No external input 3 audio

Audio output even when
Playing Disc
YES
IC808,809 - 7
Check audio signal output
YES
IC808,809-5
Check audio signal input
YES
END

11. No external input 4 audio

Audio output even when
Playing Disc
YES
IC808, 809 - 7
Check audio signal output
YES
IC808,809-1
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 =>pin 7 output : A1_L/R
Pin 2,4 High/Low =>pin 7 output : TU_L/R
NO
Check JK801 Audio L/R
terminal
NO
< When playing DISC , no
audio output> check
NO
IC808,809 (AUDIO SWITCH) Power and switching operation
Pin 2, 4 Low =>pin 7 output : A2_L/R
Pin 2, 4 High/Low =>pin 7 output : TU_L/R
NO
Check PN802 FFC Cable
1,3
YES
END
3-10
NO
Check CN904 13,14