Read Sharp LC-40LE831E (serv.man17) Service Manual online
LC-40/46LE830E, RU/831E, S
6 – 2
The sound is not emitted from the Speaker & Woofer though the picture has come out.
No sound output in all modes?
YES
Do audio signals output from pins [Y30/CPU_AOLRCK, Y31/
CPU_AOBCK, V27/CPU_AOSDATA0] of IC3303 (Digital AV
decode & Main CPU)?
CPU_AOBCK, V27/CPU_AOSDATA0] of IC3303 (Digital AV
decode & Main CPU)?
NO
Check IC3303 and its peripheral circuits.
YES
Do audio signals input to pins [7, 8, 9] of IC2701 (DSP)?
NO
Check the line between IC3303 and IC2701.
YES
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?
AMP_LRCLK, 45/AMP_DATA_LR, 46/AMP_DATA_SW, 47/
AMP_MCLK] of IC2701?
NO
Check IC2701 and its peripheral circuits.
YES
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).
to (A).
In the case that the sound is not emitted from the Woofer, refer to
(B).
(B)
(A)
Do audio signals input to pins [5, 6, 7, 8] of IC2703
(SP_AMP)?
(SP_AMP)?
NO
Check the line between IC2701 and IC2703.
YES
Do audio signals output from pins [28/OUTML, 30/
OUTPL, 12/OUTPR, 14/OUTMR] of IC2703?
OUTPL, 12/OUTPR, 14/OUTMR] of IC2703?
NO
Check IC2703 and its peripheral circuits.
YES
Is AMP_MUTE [pin (21)] of IC2703 at “H”?
NO
Check the line between IC2703 and IC3303 & IC2001 (UCOM).
(Q2701,D2701 etc...)
(Q2701,D2701 etc...)
YES
Do audio signals input to pins [1&2/L-ch, 3&4/R-ch] of
P2701?
P2701?
NO
P2701 terminal and the peripheral circuit (L/C filter) are checked.
YES
Check Speaker (right and left) and wire harness.
Do audio signals input to pins [5, 6, 7, 8] of IC2702
(Woofer_AMP)?
(Woofer_AMP)?
NO
Check the line between IC2701 and IC2702.
YES
Do audio signals output from pins [28/OUTML, 30/OUTPL, 12/
OUTPR, 14/OUTMR] of IC2702?
OUTPR, 14/OUTMR] of IC2702?
NO
Check IC2702 and its peripheral circuits.
YES
Is AMP_MUTE [pin (21)] of IC2702 at “H”?
NO
Check the line between IC2702 and IC3303 & IC2001.
(Q2701,D2701 etc...)
(Q2701,D2701 etc...)
YES
Do audio signals input to pins [1/SUB (+), 2/SUB (-)] of P2702?
NO
P2702 terminal and the peripheral circuit (L/C filter) are checked.
YES
Check Woofer and wire harness.
Click on the first or last page to see other LC-40LE831E (serv.man17) service manuals if exist.