Sharp LC-60G9T, Service Manual

Page: 47 / 108

LC-60G9T / LC-70G9T
6 – 5
No sound from external output device (5)
No sound from HEAD PHONE_OUTPUT/ AUDIO_OUTPUT terminal.
Does not the sound of the audio signal output to Headphone mode go
out? Does not the sound of the audio signal output to Audio out mode go
out?
Check whether it is selected "Headphone" by Headphone/Audio out
select under Menu-Setup-Option-Terminal setting-Headphone/Audio
out select. Check whether it is selected "Audio out" by Headphone/Audio out
select under Menu-Setup-Option-Terminal setting-Headphone/
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 [1pin] of J504 at "H" ?
NO
YES
Check the setting of an external input device that connects with
J504.
And check the line between J504 and IC3301(Digital AV decode &
Main CPU)
Is HPOUT_MUTE at "H" ?
Is HP_MUTE [B27] of IC3301 at "H"?
Is AUDIO_MUTE(MUTE_A_ALL) [23pin] of IC2004(UCOM) at "H"?
YES Check the line between J504 and HPOUT_MUTE.
(Q506,Q510,IC3301 & IC2004 etc...)
NO
Do audio signals output from pins [ 10/MONI_HP_R, 12/MONI_HP_L ]
of IC1702(HP-AMP) ? YES Check the line between IC1702 and J504.
NO
Do audio signals input to pins [14,15] of IC1702 ? YES Check IC1702 and its peripheral circuits.
NO
Do audio signals (HP_MONITOR_L/R) output from pins
[AN34/CPU_ACO_ADAC,AN35CPU_ARO_ADAC ] of IC3301 ?
YES Check the line between IC3301 and IC1702.
NO
Check IC3301 and its peripheral circuits.
No sound from external output device (6)
No sound from DIGITAL AUDIO OUTPUT terminal.
Does audio signal output from pin[1] of sound output terminal (D527)
? YES Check D527 and peripheral circuits.
NO
Does audio signal output from pin[4] of IC503 ? YES Check the line between IC503 and D527.
NO
Is AUDIO_MUTE(MUTE_A_ALL) [23pin] of IC2004(UCOM) at "H"? YES Check the peripheral circuits of IC503 and AUDIO_MUTE
(Q505 etc...)
NO
Does audio signal input to pin[2] of IC503 ? YES Check IC503 and peripheral circuits.
NO
Does audio signal (OPT_OUT) output from pin[AR16/OPT_OUT] of
IC3301(Digital AV decode & Main CPU) ? YES Check the line between IC3301 and IC503.
NO
Check IC3301 and its peripheral circuits.