LC-37XD1E (serv.man4). Troubleshooting Table - Sharp TV Service Manual (repair manual). Page 5

LC-37XD1E/RU

4 – 5

 No sound except from speakers (3) -1 

No audio output from the 
headphones.  

No audio output from 
EXT1 (SCART) terminal.

 

Is there audio output on pins 
(2) and (3) of the headphone  
terminal (J1301)?

Checklist: 
  1)  Is the MUTE button on the remote control set to ON? ... Set to OFF.
  2)  Check the connection to external devices....Is there any improper connection?

NO

Is audio input/output signal of  
pins (3) and (5)/(1) and (7) of  
IC303 (OP-AMP) normal?  

Is audio signal sent to pins  
(3) and (1) of EXT1 
(J1101)? 

NO

ls S-MUTE-LINE 
[IC1710 (pin 92)]  at H? 
(Check Q1106/Q1105 
operation.) 

       

NO

YES

   

NO

Is audio output signal (SPK- 
OUT L/R) properly sent from 
pins (28) and (27) of IC3701 
(MSP)? 

Check the connection to 
EXT1 (J1101) and exter-
nal  devices.  

Is audio signal sent 
from pins (33) and (34) 
of  IC3701?  

NO

Check the power supply 
8/5 V pins (39) and (12) 
of  IC3701 and periph-
eral circuits.

NO

YES

Check audio input signal of pin 
(67) of IC3701(MSP), pins 
(39) and (12) of the power 
line5 and 8V, pins (3) and (2) 
of I2C-LINE, and peripheral 
circuits. 

Check the audio signal 
output line from pins 
(33) and (34) of IC3701 
to pins (3) and (1) of 
EXT1.