LC-37D44EBK (serv.man6). Troubleshooting Table - Sharp TV Service Manual (repair manual). Page 2

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LC-37D44E/S/RU-BK/GY
4 – 2
No sound (during the reception of TV(DIGITAL) broadcasting)
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).
NO
Check IC4001 and its peripheral circuits.
 
YES
Is the audio signal input to PIN(6,5)/ LETFT_M/P, (2,3)/ 
RIGH_M/P of IC4005(OP-AMP)?
NO
Check the line between IC4001 and IC4005.
 YES
Is the audio signal sent from PIN(7)/ AIN1L, (1)/AIN1R of   
IC4005 to PIN(10), PIN(9) of IC3001 (MAIN_MICON)?
NO
Check the line between IC4005 and IC3001.
 
YES
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(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)?
NO
Check the setting of an external input device that connects of 
SC1102.
EXT2
Is the audio signal properly sent to pins (6) (AIN2_L) and 
(2) (AIN2_R) of SCART2(SC1101)?
NO
Check the setting of an external input device that connects of 
SC1101.
 YES
EXT1
Is the audio signal properly sent to pins (14) (AIN3_L) and 
(13) (AIN3_R) of IC3001(MAIN_MICON)?
NO
Check the line between SC1102 and IC3001.
EXT2
Is the audio signal properly sent to pins (12) (AIN2_L) and 
(11) (AIN2_R) of IC3001(MAIN_MICON)?
NO
Check the line between SC1101 and IC3001.
 YES
Refer to “No sound output in all modes”.

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