Read Sharp LC-40LU700E (serv.man9) Service Manual online
LC-32/40/46LE700E/RU/S,LU700E/S,LX700E/RU,LC-52LE700E/RU/S
6 – 10
The audio signal is not output (3)
No sound from HEADPHONE_OUTPUT terminal.
Is the HP_PLUG signal input to [H28/HP_PLUG] of IC3302 from
pin(6) of a HEADPHONE_OUTPUT terminal(J504)?
pin(6) of a HEADPHONE_OUTPUT terminal(J504)?
YES
Check the line between J504 and IC3302.
NO
Is the audio signal output (HP_L/R) to pins(2, 3) of HEADPHONE
terminal (J504)?
terminal (J504)?
YES
Check the HEADPHONE terminal(J504) and/or peripheral cir-
cuits.
cuits.
NO
Is HP-MUTE [AG13/HP_MUTE] of IC3302 at H?
YES
Check the peripheral circuits of IC3302(CPU) and HP-
MUTE_LINE.(D527,Q506, etc.)
MUTE_LINE.(D527,Q506, etc.)
NO
Is audio signal (HP_L/R) input to pins(M28/HP_L, M27/HP_R) of
IC3302?
IC3302?
YES
Check the line between IC3302 and J504.
NO
Check IC3302 and its peripheral circuits.
The audio signal is not output (4)
No sound from DIGITAL AUDIO OUTPUT terminal.
Is the audio signal output to pins(1) of sound output terminal
(D520)?
(D520)?
YES
Check D520 and/or peripheral circuits.
NO
Is SPDIF_MUTE signal [F7/SPDIF_MUTE] of IC3302
, MUTE-A_ALL signal [2pin of IC2002(UCON)] at H?
, MUTE-A_ALL signal [2pin of IC2002(UCON)] at H?
YES
Check IC3302, IC2002, its circumference circuit and
SPDIF_MUTE_LINE, MUTE-A_ALL_LINE.(Q505, D530, etc.)
SPDIF_MUTE_LINE, MUTE-A_ALL_LINE.(Q505, D530, etc.)
NO
Is an audio signal input to pin(3) of IC503, from [J28/OPT_OUT]
of IC3302 and is the logic signal input into pin (1) of IC503?
of IC3302 and is the logic signal input into pin (1) of IC503?
YES
Check the IC503 and/or peripheral circuits.
NO
Check IC3302 and its peripheral circuits.
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