No Sound From External Input Devices - Sharp LC-40LE820E Service Manual

Is there a audio input signal to pins (19/AUDIO_IN_L) and (21/
AUDIO_IN_R) of EXT1 (SC505)?
Is there a audio input signal to pins (V28/SC1_L) and (V27/
SC1_R) of IC3302 (Digital AV decode & Main CPU) from SC505?
Refer to "No sound output in all modes."
Is there a audio input signal to pins (4/CVBS_IN_L) and (1/
CVBS_IN_R) of EXT2 (J505)?
Is there a audio input signal to pins (R28/CVBS_L) and (T28/
CVBS_R) of IC3302 (Digital AV decode & Main CPU) from J505?
Refer to "No sound output in all modes."
Does not the sound of the audio signal input to HDMI-2
mode go out?
Check whether it is selected "Video + Audio" by the Audio setup
under Menu-Setup-Option-Input terminal setting - PC input.
Is there a audio input signal to pins (2/PC/HDMI_L) and (3/PC/HDMI_R) of J501 (PC AUDIO_IN)?
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?
Refer to "No sound output in all modes."

No sound from external input devices (1)

Does not the sound of the audio signal input to EXT1 go out?
YES
YES
No sound from external input devices (2)
Does not the sound of the audio signal input to EXT2 go out?
YES
YES
No sound from external input devices (3)
YES
YES
YES
LC-40/46/52LE820E, LC-40/46LU820E
NO Check the setting of an external input device that connects with
EXT1.
NO Check the line between SC505 and IC3302.
NO Check the setting of an external input device that connects with
EXT2.
NO Check IC3302 and its peripheral circuits.
Does not the sound of the audio signal input to PC/Compo-
nent mode go out?
Check whether it is selected "HDMI + Analog" by the Audio setup
under Menu-Setup-Option-Input terminal setting - PC input.
Check the setting of an external input device that connects with
J501.
NO Check the line between J501 and IC3302.
7 – 4
YES
NO