No audio output from external input
<<HDMI>>[INPUT-3]
Is L-ch audio signal fed from input terminal J503 to pin 1 of IC501?
Is R-ch audio signal fed from input terminal J503 to pin 1 of IC502?
<<PC>>[INPUT-4]
Is L-ch audio signal fed from input terminal J401 to pin 5 of IC501?
Is R-ch audio signal fed from input terminal J401 to pin 5 of IC502?
Are audio signals from pin 3 of IC501 and IC502 to pins 10 and 12 of
IC302 normal?
<<INPUT-1>>
Is L-ch audio signal fed from input terminal J501 to pin 12 of IC501?
Is R-ch audio signal fed from input terminal J501 to pin 12 of IC502?
<<INPUT-2>>
Is L-ch audio signal fed from input terminal J502 to pin 14 of IC501?
Is R-ch audio signal fed from input terminal J502 to pin 14 of IC502?
No
Check the circuits between IC501/IC502 and IC302.
Check the Circuits between IC302 and IC801.
Is audio input from pin 4 of IC302 to pin W6 of IC801 normal?
No
Check IC1302 and peripheral circuits.
Is audiio output from IC1302 normal?
No
Check the connector (P1301) of SUB_UNIT and around the speakers
Yes
Yes
Yes
Yes
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