LC-46X8E (serv.man8). Troubleshooting Table - Sharp TV Parts Guide (repair manual). Page 12

LC-46X8E/S/RU

4 – 12

                                            
The R/G/B video signal input from EXT1 doesn’t come out in the display.
The R/G/B video signal input from EXT2 doesn’t come out in the display.

TERMINAL UNIT:                 
<EXT1>
Is RGB signal (R1/G1/B1) sent to pins (15, 11, 7) of SCART1 
(SC502)?

NO

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

<EXT2>
Is RGB signal (R2/G2/B2) sent to pins (15, 11, 7) of SCART2 
(SC503)?

NO

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

YES

<EXT1>
Is RGB signal (R1/G1/B1) sent to pins (25, 21, 23) of IC506 
(V_SELECTOR)?

NO

Check the line between SC502 and IC506.

<EXT2>
Is RGB signal (R2/G2/B2) sent to pins (31, 27, 29) of IC506 
(V_SELECTOR)?

NO

Check the line between SC503 and IC506.

YES

Is RGB signal output from pin (54, 56, 55) of IC506 to pins (12, 
14, 16) of connector (SC501)?

NO

Check the line between IC506 and SC501.

MAIN UNIT:                          

YES

Is RGB signal sent to pins (12, 14, 16) of connector (SC1101)?

NO

Check the connector (SC501/SC1101)

YES

Is RGB signal sent to pins (Y8, V6, W9) of IC3301 
(VIDEO_PROCESSOR)?

NO

Check the line between SC1101 and IC3301.
(Q1104, Q1105, Q1106, etc.)

YES

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