LC-37D44EBK (serv.man6). Troubleshooting Table - Sharp TV Service Manual (repair manual). Page 3

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LC-37D44E/S/RU-BK/GY
4 – 3
No sound from external input devices (2)
Does not the sound of the audio signal input to EXT3 go out?
MINI AV UNIT:
Is audio signal output from pin(5/IN3L), (4/IN3R) of input 
terminal J1002 to pin(8), (6) of connector SC1001?
NO
Check connection of between from J1002 to SC1001 and the exter-
nal input device.
MAIN UNIT:
 
YES
Is audio signal input to pin(8/IN3L), (6/IN3R) of connector 
P1001?
NO
Check the connector(SC1001/ P1001).
 YES
Is audio signal input to pin(1/IN3L), (6/IN3R) of IC1301 
(AUDIO_SELECTOR)?
NO
Check the line between P1001 and IC1301.
 YES
Is the audio signal sent to pin (15/AIN4L), (11/AIN4R) of 
IC1301?
NO
Check IC1301 and its peripheral circuits.
 YES
Is audio signal input from pin (15/AIN4L), (11/AIN4R) of IC1301 to pin (16, 15) of IC3001 (MAIN_MICON)?
 YES
 NO
Refer to “No sound output in all modes”
Check the line between IC1301 and IC3001.
No sound from external input devices (3)
Does not the sound of the audio signal input to EXT4 go 
out?
Does not the sound of the audio signal input to EXT6(Analog) go 
out?
Whether "Analog" has selected it in the Audio setup of the HDMI 
option is checked. 
Is audio signal sent from pin(2/L) and (3/R) of input termi-
nal J1301 to pin(5) and (8) of IC1301 
(AUDIO_SELECTOR)?
YES
Is audio signal sent from pin(2/L) and (3/R) of input terminal J1302 to 
pin(3) and (7) of IC1301(AUDIO_SELECTOR)?
 NO
 NO
Check the connection between J1301 and the peripheral 
circuit, the external input devices.
Check the connection between J1302 and the peripheral circuit, the 
external input devices.
Is the audio signal sent to pin (15/AIN4L), (11/AIN4R) of 
IC1301?
NO
Check IC1301 and its peripheral circuits.

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