LC-46LE820E (serv.man4). Troubleshooting - Sharp TV Service Manual (repair manual). Page 4

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LC-40/46/52LE820E, LC-40/46LU820E
7 – 4
No sound from external input devices (1)
Does not the sound of the audio signal input to EXT1 go out?
                                            
Is there a audio input signal to pins (19/AUDIO_IN_L) and (21/
AUDIO_IN_R) of EXT1 (SC505)?
NO
Check the setting of an external input device that connects with 
EXT1.
YES
Is there a audio input signal to pins (V28/SC1_L) and (V27/
SC1_R) of IC3302 (Digital AV decode & Main CPU) from SC505?
NO
Check the line between SC505 and IC3302.
YES
Refer to “No sound output in all modes.”
No sound from external input devices (2)
Does not the sound of the audio signal input to EXT2 go out?
                                            
Is there a audio input signal to pins (4/CVBS_IN_L) and (1/
CVBS_IN_R) of EXT2 (J505)?
NO
Check the setting of an external input device that connects with 
EXT2.
YES
Is there a audio input signal to pins (R28/CVBS_L) and (T28/
CVBS_R) of IC3302 (Digital AV decode & Main CPU) from J505?
NO
Check IC3302 and its peripheral circuits.
YES
Refer to “No sound output in all modes.”
No sound from external input devices (3)
                                            
                                            
Does not the sound of the audio signal input to HDMI-2 
mode go out?
Does not the sound of the audio signal input to PC/Compo-
nent mode go out?
                                            
                                            
Check whether it is selected “Video + Audio” by the Audio setup 
under Menu-Setup-Option-Input terminal setting - PC input.
Check whether it is selected “HDMI + Analog” by the Audio setup 
under Menu-Setup-Option-Input terminal setting - PC input.
YES
YES
Is there a audio input signal to pins (2/PC/HDMI_L) and (3/PC/HDMI_R) of J501 (PC AUDIO_IN)?
YES
                                            
NO
Check the setting of an external input device that connects with 
J501.
Is there a audio input signal to pins (V30/PC/HDMI_L) and (V29/
PC/HDMI_R) of IC3302 (Digital AV decode & Main CPU) from 
J501?
NO
Check the line between J501 and IC3302.
YES
Refer to “No sound output in all modes.”
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