Sharp LC-40LE830E/RU Service Manual page 53

The sound is not emitted from the Speaker & Woofer though the picture has come out.
No sound output in all modes?
Do audio signals output from pins [Y30/CPU_AOLRCK, Y31/
CPU_AOBCK, V27/CPU_AOSDATA0] of IC3303 (Digital AV
decode & Main CPU)?
Do audio signals input to pins [7, 8, 9] of IC2701 (DSP)?
Do audio signals output from pins [43/AMP_BCLK, 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).
Do audio signals input to pins [5, 6, 7, 8] of IC2703
(SP_AMP)?
Do audio signals output from pins [28/OUTML, 30/
OUTPL, 12/OUTPR, 14/OUTMR] of IC2703?
Is AMP_MUTE [pin (21)] of IC2703 at "H"?
Do audio signals input to pins [1&2/L-ch, 3&4/R-ch] of
P2701?
Check Speaker (right and left) and wire harness.
(B)
Do audio signals input to pins [5, 6, 7, 8] of IC2702
(Woofer_AMP)?
Do audio signals output from pins [28/OUTML, 30/OUTPL, 12/
OUTPR, 14/OUTMR] of IC2702?
Is AMP_MUTE [pin (21)] of IC2702 at "H"?
Do audio signals input to pins [1/SUB (+), 2/SUB (-)] of P2702?
Check Woofer and wire harness.
YES
YES
YES
YES
(A)
YES
YES
YES
YES
YES
YES
YES
YES
NO Check IC3303 and its peripheral circuits.
NO Check the line between IC3303 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 Check the line between IC2703 and IC3303 & IC2001 (UCOM).
(Q2701,D2701 etc...)
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 Check the line between IC2702 and IC3303 & IC2001.
(Q2701,D2701 etc...)
NO P2702 terminal and the peripheral circuit (L/C filter) are checked.
6 – 2
LC-40/46LE830E, RU/831E, S