Sharp LC-40LE810E Service Manual page 42

LC-40/46LE810E (1st Edition)
The sound is not emitted from the Speaker & Woofer though the picture has come out.
Is the signal output from pins (F30/AOLRCK), (F28/AOBCK)
(G28/AOSDATA0) of IC3302 (Digital AV decode & Main CPU)?
Is the signal sent to pins (7), (8), (9) of IC2701 (DSP)?
Is the signal output from pins (43/AOBCKL), (44/AMP_LRCLK),
(45/AMP_DATA_LR), (46/AMP_DATA_SW), (47/AMP_MCLK) of
IC2701?
In the case that the sound is not emitted from the Speaker, refer
to (A)
In the case that the sound is not emitted from the Woofer, refer to
(B)
Is the signal sent to pins (5), (6), (7), (8) of IC2703
(SP_AMP)?
Is the audio signal output from pins (28/OUTML), (30/
OUTPL), (12/OUTPR), (14/OUTMR) of IC2703?
Is the audio signal input to pins (1, 2/L-ch), (3, 4/R-ch) of
IC2703?
Check Speaker (right and left) and wire harness.
(B)
Is the signal sent to pins (5), (6), (7), (8) of IC2702
(Woofer_AMP)?
Is the audio signal output from pins (28/OUTML), (30/OUTPL),
(12/OUTPR), (14/OUTMR) of IC2702?
Is the audio signal input to pins (1/SUB(+)), (2/SUB(-)) of
IC2702?
Check Woofer (right and left) and wire harness.
No sound output in all modes?
YES
YES
YES
YES
(A)
YES
YES
YES
YES
YES
YES
NO Check IC3302 and its peripheral circuits.
NO Check the line between IC3302 and IC2701.
NO Check IC2701 and its peripheral circuits.
NO Check the line between IC2701 and IC2703.
NO Check IC2703 and its peripheral circuits.
NO P2701 terminal and the peripheral circuit (L/C filter) are checked.
NO Check the line between IC2701 and IC2702.
NO Check IC2702 and its peripheral circuits.
NO P2702 terminal and the peripheral circuit (L/C filter) are checked.
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