Sharp LC-70LE835E/RU Service Manual page 54

LC-70LE835E/RU, 836E/S, 838E
No sound from HEAD PHONE_OUTPUT/ AUDIO_OUTPUT terminal.
Does not the sound of the audio signal output to Headphone
mode go out?
Check whether it is selected "Headphone" by Headphone/Audio
out select under Menu-Setup-Option-Terminal setting-Head-
phone/Audio out select.
Do audio signals output from pins [2/MONI_HP_R, 3/MONI_HP_L] of J504 (HP Jack/AUDIO OUT)?
Is HP_PLUG [1 pin] of J504 at "H"?
Is HPOUT_MUTE at "H"?
Is HP_MUTE [AH12] of IC3303 at "H"?
Is AUDIO_MUTE (MUTE_A_ALL) [23 pin] of IC2001 (UCOM) at
"H"?
Do audio signals output from pins [2/MONI_HP_L, 11/
MONI_HP_R] of IC2704 (HP-AMP)?
Do audio signals input to pins [1, 12] of IC2704?
Do audio signals (HP_MONITOR_L/R) output from pins [AJ31/
HP_MON_L, AJ32/HP_MON_R] of IC3303?
Check IC3303 and its peripheral circuits.
No sound from external output device (2)
NO
NO
NO
NO
NO
Does not the sound of the audio signal output to Audio out
mode go out?
Check whether it is selected "Audio out" by Headphone/Audio out
select under Menu-Setup-Option-Terminal setting-Headphone/
Audio out select.
Check the setting of an external input device that connects with
J504.
And check the line between J504 and IC3303 (Digital AV decode
& Main CPU).
YES Check the line between J504 and HPOUT_MUTE.
(Q506, D2711, IC3303 & IC2001 etc...)
YES Check the line between IC2704 and J504.
YES Check IC2704 and its peripheral circuits.
YES Check the line between IC3303 and IC2704.
6 – 8
YES