Audio Signal Section Troubles - Emerson LC320EM1 Service Manual

[ Audio Signal Section ]
FLOW CHART NO.1
Audio is not outputted normally.(Audio input)
Yes
Pin(6) : AMP(L)-OUT
Pin(8) : AMP(R)-OUT
Pin(2) : AUDIO(L)-OUT
Pin(4) : AUDIO(R)-OUT
Yes
Yes
CN801: SP(L)
CN802: SP(R)
JK871: AUDIO(L)-OUT
JK872: AUDIO(R)-OUT
No
Check the line between Pin(2, 15) of IC771 and input
terminal(JK753, JK754), and service it if defective.
No
No
No
No
Yes
Check SP801,SP802 and their periphery circuit,
and service it if defective.
No
8-7 FL10.3TR