Sharp Aquos LC-60LE740E, Service Manual

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LC-60/70LE740E/RU,741E/S,743E,60LE840E/RU,841E/S,843E,80LE645E/RU,646E/S,648E
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No sound from external input devices (5)
Does not the sound of the audio signal input to HDMI1/2/3/4 go out?
Please Refer to “[External input HDMI-1/2/3/4] No picture on the display (11)”.
No sound from external output device (1)
No audio signal output to EXT1 terminal.
Do audio signals output from pins [1/AUDIO_OUT_R, 3/
AUDIO_OUT_L] of EXT1 (SC505)?
YES Check the setting of an external input device that connects with
EXT1.
NO
Is AUDIO_MUTE(MUTE_A_ALL) [23 pin] of IC2001 (UCOM) at
“H”? YES Check the peripheral circuits of IC2001 and AUDIO_MUTE.
(Q502 etc...)
NO
Do audio signals output from pins [1/TUNER_R_OUT, 7/
TUNER_L_OUT] of IC2706 (Buffer AMP)? YES Check the line between IC2706 and SC505.
NO
Do audio signals input to pins [2, 6] of IC2706? YES Check IC2706 and its peripheral circuits.
NO
Do audio signals (TUNER_OUTR/L) output from pins [AG31/
TUNER_OUT_R, AG32/TUNER_OUT_L] of IC3303 (Digital AV
decode & Main CPU)? YES Check between IC3303 and IC2706.
NO
Check IC3303 and its peripheral circuits.