Read Sharp LC-40LU700E (serv.man9) Service Manual online
LC-32/40/46LE700E/RU/S,LU700E/S,LX700E/RU,LC-52LE700E/RU/S
6 – 5
The sound is not emitted from the speaker though the picture has come out.
No sound output in all modes.?
YES
Is the SPK_OUT communication output to from pins (N29/
SPK_OUT_R) (N30/SPK_OUT_L) of IC3302
(Digital AV decode & Main CPU)?
SPK_OUT_R) (N30/SPK_OUT_L) of IC3302
(Digital AV decode & Main CPU)?
NO
Check IC3302 and its peripheral circuits.
YES
Is the SPK_OUT communication sent to pins(3),(7) of IC2701
(POWER_AMP) from of IC3302?
(POWER_AMP) from of IC3302?
NO
Check the line between IC3302 and IC2701.
YES
Is the audio signal output of pin(27, 28/L-ch), (11, 12/R-ch) of
IC2701 (POWER_AMP) normal?
IC2701 (POWER_AMP) normal?
NO
Check IC2701 and its peripheral circuits.
YES
Is the audio signal output of pins (1, 2/L-ch), (4, 3/R-ch) of
P2701(SP) terminal normal?
P2701(SP) terminal normal?
NO
P2701(SP) terminal and the peripheral circuit (L/C filter) are
checked.
checked.
YES
Check Speaker (right and left) and wire harness.
No sound (during the reception of TV(ANALOG) broadcasting)
Does not the sound go out though the picture has come out when UHF/VHF is received?
YES
Is a SIF signal output from pin (4) of TUNER (TU1101)?
NO
Check the tuner and its peripheral circuits.
Replace as required.
Replace as required.
YES
Is a SIF signal input to (AB27/S_IF) of IC3302(Digital AV decode
& Main CPU) from pin (4) of TU1101?
& Main CPU) from pin (4) of TU1101?
NO
Check the line between TU1101 and IC3302.
(Q1104, etc.)
(Q1104, etc.)
YES
Refer to “No sound output in all modes”
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