LC-40/46LE814/824E/RU (1st Edition)
5 – 6
No sound from external output device (1)
No audio signal output to EXT1 terminal.
Is there a audio input signal to pins (10/AUDIO_OUT_L) and (12/
AUDIO_OUT_R) of EXT1 (SC505)?
YES
Check the setting of an external input device that connects with
EXT1.
NO
Is SC1-MUTE [118pins of IC4405] or MUTE_A_ALL [21pin of
IC2002 (UCOM)] at “H”?
YES
Check the peripheral circuits of IC4405/2002 and SC1-MUTE.
(Q502, D529 etc.)
NO
Is there a audio output signal to pins (M30/TUNER_OUT_L) and
(M29/TUNER_OUT_R) of IC3302?
YES
Check the line between IC3302 and SC505.
NO
Check IC3302 and its peripheral circuits.
No sound from external output device (2)
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- Input terminal setting.
Check whether it is selected “Audio out” by Headphone/Audio out
select under Menu-Setup-Option-Input terminal setting.
YES
YES
Is there a audio output signal to pins (2/HP/MONI_L) and (3/HP/MONI_R) of J504 (HEAD PHONE_OUTPUT/ AUDIO_OUTPUT terminal)?
NO
YES
Check the setting of an external input device that connects with
J504.
Is the HP_PLUG signal input to [91/HP_PLUG] of IC4405 from
pin (6) of J504?
NO
Check the line between J504 and IC4405.
YES
Is HP/MONI_MUTE [AJ11 of IC3302 (Digital AV decode & Main
CPU)] or MUTE_A_ALL [21pin of IC2002 (UCOM)] at “H”?
YES
Check the peripheral circuits of IC3302 and HP-MUTE_LINE.
(D527, Q506, etc.)
NO
Is audio signal (HP_L/R) input to pins (M28/HP/MONI_L, M27/
HP/MONI_R) of IC3302?
YES
Check the line between IC3302 and J504.
NO
Check IC3302 and its peripheral circuits.
