Sharp LC42D65U - LC - 42" LCD TV, Руководство по обслуживанию

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LC-42D65U
6 – 10
No audio (1)
INPUT-3 No audio.
Is INPUT-3 selected on the input select menu screen?
YES
NO
Is the audio output selected for “VARIABLE” on
the menu screen?
Set the audio output to “FIXED”.
Does the audio signal come from pins(5)(L) and (4)(R) of input ter-
minal(J501) to pins(40)(L) and (41)(R) of IC1403(CODEC)?
YES
NO
Check the line between J501 and IC1403.
Does the I2S signal come from pins(4)(COD_LRCK), (5)(COD_BCK) and (6)(COD_SDOUT) of IC1403 to pins(AK24), (AH24) and (AJ24) of
IC8001(CPU)?
YES
NO
Check the line between IC1403 and IC8001.
Does the audio signal come from pins(AP28/AN28)(SPOUT_LN/P),
and (AN29/AP29) to pins(6/5)(INLM/INLP), and (8/9)(INRM/INRP) of
IC2701(AMP)?
NO
Check the line between IC8001 and IC2701, and their periph-
eral circuits. (Q1306 thru Q1308, AMP_MUTE line, etc.)
YES
Is the audio output from IC2701 as specified? NO Check IC2701 and its peripheral circuits.
YES
Check the connector(P2701), speakers and their peripheral circuits.