Read Sharp LC-40LU700E (serv.man9) Service Manual online
LC-32/40/46LE700E/RU/S,LU700E/S,LX700E/RU,LC-52LE700E/RU/S
6 – 9
The audio signal is not output (1)
No audio signal output from EXT1/EXT2 terminal.
Is there a audio input signal in pins (3/TUNER_OUT_L) and (1/
TUNER_OUT_R) of EXT1 (SC503)?
TUNER_OUT_R) of EXT1 (SC503)?
YES
Check the setting of an external input device that connects with
EXT1.
EXT1.
Is there a audio input signal in pins (3/MONITOR_L) and (2/
MONITOR_R) of EXT2 (SC502)?
MONITOR_R) of EXT2 (SC502)?
YES
Check the setting of an external input device that connects with
EXT2.
EXT2.
NO
Is (AF11/SC1-MUTE) of IC3302
(Digital AV decode & Main CPU) at H?
(Digital AV decode & Main CPU) at H?
YES
Check the peripheral circuits of IC3302 and SC1-MUTE.(Q502,
D529etc.)
D529etc.)
Is (AG11/SC2-MUTE) of IC3302
(Digital AV decode & Main CPU) at H?
(Digital AV decode & Main CPU) at H?
YES
Check the peripheral circuits of IC3302 and SC2-
MUTE.(Q501,D528etc.)
MUTE.(Q501,D528etc.)
NO
Is there a audio output signal in pins(N27/TUNER_OUT_L) and
(N28/TUNER_OUT_R) of IC3302 (Digital AV decode & Main
CPU)?
(N28/TUNER_OUT_R) of IC3302 (Digital AV decode & Main
CPU)?
YES
Check the line between IC3302 and SC503.
Is there a audio output signal in pins(M30/MONITOR_L) and
(M29/MONITOR_R) of IC3302 (Digital AV decode & Main CPU)?
(M29/MONITOR_R) of IC3302 (Digital AV decode & Main CPU)?
YES
Check the line between IC3302 and SC502.
NO
Check IC3302 and its peripheral circuits.
The audio signal is not output (2)
No audio signal output from AUDIO_OUTPUT terminal.
Is audio signal (L/R) output to pins (2, 4) of AUDIO_OUTPUT ter-
minal(J506)?
minal(J506)?
YES
Check the connection to AUDIO_OUTPUT terminal and external
input devices.
input devices.
NO
Is MONITOR_MUTE signal [AF13/MONI_MUTE] of IC3302 or
MUTE_A_ALL signal [21pin of IC2002(UCOM)] at "H"?
MUTE_A_ALL signal [21pin of IC2002(UCOM)] at "H"?
YES
Check the peripheral circuits of IC3302 and MUTE-
A_ALL_LINE.(D526, etc.)
A_ALL_LINE.(D526, etc.)
NO
Is audio signal (L/R) input to pins [M29/MONITOR_R] [M30/
MONITOR_L] of IC3302?
MONITOR_L] of IC3302?
YES
Check the line between IC3302 and J506.
(Q507,508,Q509,D526)
(Q507,508,Q509,D526)
NO
Check IC3302 and its peripheral circuits.
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