Read Sharp LC-70LE741E (serv.man11) Service Manual online
LC-60/70LE740E/RU,741E/S,743E,60LE840E/RU,841E/S,843E,80LE645E/RU,646E/S,648E
6 – 2
The sound is not emitted from the Speaker.
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, 47/AMP_MCLK] of IC2701?
AMP_LRCLK, 45/AMP_DATA_LR, 47/AMP_MCLK] of IC2701?
NO
Check IC2701 and its peripheral circuits.
YES
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.
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