Sharp LC-32L407I, Руководство по обслуживанию

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LC-32L407I
6 – 6
No audio heard (2)
No external audio heard
<INPUT 2>
Is there the L-ch audio signal input from pin (5) of input terminal
J5510 to pin (77) of IC3301?
Is there the R-ch audio signal input from pin (7) of input terminal
J5510 to pin (78) of IC3301?
<INPUT 3>
Is there the L-ch audio signal input from pin (5) of input terminal
J5508 to pin (75) of IC3301?
Is there the R-ch audio signal input from pin (7) of input terminal
J5508 to pin (76) of IC3301?
<INPUT 4>
Is there the L-ch audio signal input from pin (2) of input terminal
J5503 to pin (72) of IC3301?
Is there the R-ch audio signal input from pin (4) of input terminal
J5503 to pin (73) of IC3301?
YES
Is there the I2S signal input at pin (180), (181) of IC3301? NO Check IC3301 and its peripheral circuits.
YES
Is there L-ch audio signal input at pin(3) of IC2701? NO Check connection between IC3301 and IC2701 and its periph-
eral circuits.
Is there R-ch audio signal input at pin(7) of IC2701?
YES
Is the L-ch audio signal output at pin(27), (28), (29) and (30) of
IC2701 normal?
NO Check IC2701 and its peripheral circuits.
Is the R-ch audio signal output at pin(11), (12), (13) and (14) of
IC2701 normal?
YES
Are the audio signal L-ch and R-ch output at (1)/(2) and (3)/(4) of
P2701 normal?
NO Check circuit between IC2701 & P2701.
YES
Check speakers and their peripheral circuits.