LC-19D1EBK (serv.man5). Troubleshooting Table - Sharp TV Service Manual (repair manual). Page 7

LC-19D1E/S-BK/WH

4 – 7

                                            
No sound from EXT1 (SCART) connecting an external input 
device.

                                            
<EXT1>
Is SCART-L-IN audio signal input from pin (6) of SCART1 termi-
nal (SC501) to pin (14) of IC501 (AV-SW)?
Is SCART-R-IN audio signal input from pin (2) of SCART1 termi-
nal (SC501) to pin (15) of IC501?

NO

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

YES

Is the audio signal (TERMINAL-L/R) properly output from pins 
(34) and (33) of IC501 (AV-SW)? 

NO

Check the Power supply input of pin(38) of IC501, or SDA2/SCL2 
signal of pins (28) and (29) or peripheral circuits.

YES

Is the audio signal (LOUT2/ROUT2)  output properly from pins 
(25) and (23) of  IC302  (A-CODEC) ?   

NO

Check pins (1) and (4) of  IC302 (A-CODEC) , pins (11) and (12) 
of  Connector SC1202, audio-mute line (Q301/Q302) or periph-
eral circuits. 

YES

Is the audio  signal L-CH output to  pins  (44-45) and (40-41)  of  
IC303 (POWER-AMP)? Is the audio  signal R-CH output to  pins  
(20-21) and (16-17) of  IC303 (POWER-AMP)  normally ?  

NO

Check UR12V power supply input pins (47) and (14) of  IC303 
(POWER-AMP) or peripheral circuits.

YES

Is the audio signal of pins (1)-(4) of  SP-Connector (P301)  prop-
erly output?

NO

Check SP-CONNECTOR (P301) and short circuit.

YES

Check SP-BOX (right and left) and WIRE HARNESS.