LC-46XL2E (serv.man4). Troubleshooting Table - Sharp TV Service Manual (repair manual). Page 12

LC-42XL2E/S/RU, LC-46XL2E/S/RU, LC-46X20E/S/RU, LC-52XL2E/S/RU, LC-52X20E/S/RU

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Does not the picture of the R/G/B video signal input to EXT1 go out?
Does not the picture of the R/G/B video signal input to EXT2 go out?

TERMINAL UNIT:                 
<EXT1>
Is RGB1 signal sent to pins (15)/R1, (11)/G1 and (7)/B1 of 
SCART1 (SC502)?

NO

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

<EXT2>
Is RGB2 signal sent to pins (15)/R2, (11)/G2 and (7)/B2 of 
SCART2 (SC503)?

NO

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

YES

<EXT1>
Is RGB1 signal sent to pins (25)/R1, (21)/G1 and (23)/B1 of 
IC506?

NO

Check the line between SC502 and IC506.

<EXT2>
Is RGB2 signal sent to pins (31)/R2, (27)/G2 and (29)/B2 of 
IC506?

NO

Check the line between SC503 and IC506.

YES

Is RGB signal output from pin (54), (56), and (55) of IC506 to pin 
(12), (14), and (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.”