No Sound (During The Reception Of Tv(Digital) Broadcasting); No Sound From External Input Devices (1) - Sharp LC-37D44E Service Manual

Does not the sound go out though the picture has come out when DTV is received?
Is the audio signal output from PIN(24,25)/ LETFT_M/P,
PIN(28,29)/ RIGH_M/P of IC4001(SET-
TOP_BOX_DECODER).
Is the audio signal input to PIN(6,5)/ LETFT_M/P, (2,3)/
RIGH_M/P of IC4005(OP-AMP)?
Is the audio signal sent from PIN(7)/ AIN1L, (1)/AIN1R of
IC4005 to PIN(10), PIN(9) of IC3001 (MAIN_MICON)?
Refer to "No sound output in all modes".
Does not the sound of the audio signal input to EXT1(SCART1) go out?
Does not the sound of the audio signal input to EXT2(SCART2) go out?
EXT1
Is the audio signal properly sent to pins (6) (AIN3_L) and
(2) (AIN3_R) of SCART1(SC1102)?
EXT2
Is the audio signal properly sent to pins (6) (AIN2_L) and
(2) (AIN2_R) of SCART2(SC1101)?
EXT1
Is the audio signal properly sent to pins (14) (AIN3_L) and
(13) (AIN3_R) of IC3001(MAIN_MICON)?
EXT2
Is the audio signal properly sent to pins (12) (AIN2_L) and
(11) (AIN2_R) of IC3001(MAIN_MICON)?
Refer to "No sound output in all modes".

No sound (during the reception of TV(DIGITAL) broadcasting)

YES
YES
YES

No sound from external input devices (1)

YES
YES
NO
Check IC4001 and its peripheral circuits.
NO
Check the line between IC4001 and IC4005.
NO
Check the line between IC4005 and IC3001.
NO
Check the setting of an external input device that connects of
SC1102.
NO
Check the setting of an external input device that connects of
SC1101.
NO
Check the line between SC1102 and IC3001.
NO
Check the line between SC1101 and IC3001.
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LC-37D44E/S/RU-BK/GY