LC-52XL1E (serv.man3). Adjustment Procedure - Sharp TV Service Manual (repair manual). Page 5

LC-46XL1E/RU, LC-52XL1E/RU

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No audio output from the 
headphones.

No audio output from 
EXT1 (SCART1) 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

Is 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.

 

Is S-MUTE-LINE [IC1710 (pin 92)] at H?             

No audio output from 
EXT2 (SCART2) termi-
nal.

No audio output from 
AUDIO OUTPUT termi-
nal.

            

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?

            

Is audio signal sent to 
pins (24) and (22) of 
EXT2 (J1101)? 

NO

Is S-MUTE-LINE [IC1710 
(pin 92)] or S2-MUTE-
LINE [IC1710 (pin 90)] at 
H?
(Check Q1102/Q1101 
operation.)

Is S-MUTE-LINE 
[IC1710 (pin 92)] at H?
(Check 1204/Q1203 
operation.)

NO

Is audio signal sent to 
pins (13) and (15) [L/R 
(white) (red)] of AUDIO 
OUTPUT terminal 
(J1201)? 

       

YES

NO

            

NO

YES

Check the connection to 
EXT2 (J1101) and 
external devices. 

Is audio signal sent from pins (36) and (37) of IC3701?

Check the connection 
to AUDIO OUTPUT 
terminal (J1201) and 
external devices. 

NO

YES

Check the power supply 8/
5 V pins (39) and (12) of 
IC3701 and peripheral cir-
cuits.

Check the audio signal 
output line from pins 
(36) and (37) of IC3701 
to Q1103/Q1104/
Q1201/Q1202.