LC-46X8E (serv.man8). Troubleshooting Table - Sharp TV Parts Guide (repair manual). Page 11

LC-46X8E/S/RU

4 – 11

                                            
The CVBS video signal input from EXT1 doesn’t come out in the display.
The CVBS video signal input from EXT2 doesn’t come out in the display.

TERMINAL UNIT:                 
<EXT1>
Is CVBS signal sent to pin (20) of SCART1 (SC502)? 

NO

Check the setting of an external input device that connects of 
SC502.

<EXT2>
Is CVBS signal sent to pin (20) of SCART2 (SC503)? 

NO

Check the setting of an external input device that connects of 
SC503.

YES

<EXT1>
Is CVBS signal sent to pin (65) of IC506?

NO

Check the line between SCART1 (SC502) and IC506.

<EXT2>
Is CVBS signal sent to pin (71) of IC506?

NO

Check the line between SCART2 (SC503) and IC506.

YES

Is CVBS signal (MAIN_Y/V) output from pin (52) of IC506 to pin 
(2) of connector (SC501)?

NO

Check the line between IC506 and SC501.

MAIN UNIT:                          

YES

Is CVBS signal (MAIN_Y/V) input to pin (2) of connector 
SC1101?

NO

Check the connector SC501/SC1101.

YES

Is CVBS signal (MAIN_Y/V) input to pins (Y4) of IC3301 
(VIDEO_PROCESSOR)?

NO

Check the line between SC1101 and IC3301.

YES

Refer to “The picture doesn't appear in all modes.”