LC-37XD1E (serv.man4). Troubleshooting Table - Sharp TV Service Manual (repair manual). Page 3

LC-37XD1E/RU

4 – 3

 No sound from external input devices (2) -1 

No sound from an external input 
device connected to EXT1 
(SCART1).  

No sound from an external   
input device connected to 
EXT2 (SCART2). 

No sound from an external input 
device connected to EXT3. 

<EXT1>
Is IN1-L audio signal sent from 
pin (6) of SCART1 terminal 
(J1101) to pin (53) of IC3701 
(MSP)?
Is IN1-R audio signal sent from 
pin (2) of SCART1 terminal 
(J1101) to pin (54) of IC3701 
(MSP)?

YES

<EXT2>
Is IN2-L audio signal sent 
from pin (27) of SCART2 ter-
minal (J1101) to pin (56) of 
IC3701 (MSP)?
Is IN2-R audio signal sent 
from pin (23) of SCART2 ter-
minal (J1101) to pin (57) of 
IC3701 (MSP)?

YES

<EXT3>
Is IN3-L audio signal sent from 
pin (3) of
J1201 terminal to pin (47) of 
IC3701? 
Is IN3-R audio signal sent from 
pin (5) of  J1201 terminal to pin 
(48) of IC3701?  

NO

NO

NO

Check pins (6) and (2) of 
SCART1 and connection to an 
external input device. 

Check pins (27) and (23) of 
SCART2 and connection to 
an external input device.

Check pins 3 and 5 of EXT3 
(J1201) and connection to an 
external input device. 

  

Is the audio signal properly sent from pins (28) and (27) of IC3701 ?

NO

YES

Check IC3701 or peripheral circuits. 

 

Is the audio signal of  pins (1) 
and (7) of IC303  (OP-AMP) 
sent properly?  

NO

Check IC303 or peripheral circuits.   

YES

 

Is the audio output  signal of 
pins (13) and  (16) of IC302/
IC301(MAIN-AMP) normal?

NO

Check IC302/IC301 (MAIN-AMP), HEAD-
PHONE and  peripheral circuits. 

YES

 .

Check 

CONNECTOR(P301) 

and  SP-BOX(right and left).