Sharp Aquos LC-42BX5H, Руководство по обслуживанию

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LC-42BX5H/M/X
6 – 7
No audio heard (1)
No sound in the UHF/VHF reception.
Is the IF output from the tuner pin (14) of TU3401 as specified?
NO Check TU3401 and its peripheral circuits.
YES
Is the SIF signal input at A21 pin of IC801 as specified? NO Check Q3414, Q3415 and their peripheral circuits.
YES
Are audio signals from the pins B23 and D23 of IC801 as
prescribed? NO Check IC801 and their peripheral circuits.
YES
Is there the L-ch audio signal output at pins (56), (53) of IC1301? NO Check IC1301 and its peripheral circuits.
Is there the R-ch audio signal output at pins (57), (54) of IC1301?
YES
Is there the L-ch audio signal output at pins (20), (21) of IC1303
(AMP)? NO Check IC1303 and its peripheral circuits.
Is there the R-ch audio signal output at pins (40), (41) of IC1303
(AMP)?
YES
Are audio signals of L-ch and R-ch output from the pins (1)/(2)
and (3)/(4) of P5007 normally?
YES
Check the speakers and their peripheral circuits.