LC-46LE820E (serv.man4). Troubleshooting - Sharp TV Service Manual (repair manual). Page 5

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LC-40/46/52LE820E, LC-40/46LU820E
7 – 5
No sound from external input devices (4)
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 (10)”.
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 IC3302 (Digital AV decode & Main 
CPU)] or MUTE_A_ALL [21pin of IC2002 (UCOM)] at “H”?
YES
Check the peripheral circuits of IC3302 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.
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