LC-46DH77E (serv.man5). Troubleshooting Table - Sharp TV Service Manual (repair manual). Page 10

LC-42DH77E/RU/S/V, LC-46DH77E/RU/S/V

4 – 10

                                            

                                            
Are the video signal and the synchronized signal input from pin 
(1, 2, 3)/(R, G, B), (14 and 13)/(V, H) of EXT4 (SC1504)?

NO

Check the connection and setup with the external DVI devices.

YES

Are the video signal and the synchronized signal input from pins 
(R1, T4, N3)/(R, G, B), pins (AF2, AE2)/(H, V) of IC8101 (DIGI-
TAL AV DECODER & MAIN CPU & VIDEO PROCESSER)?

NO

Check the line between SC1504 and IC8101.

YES

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

                                            
Does not the picture of the CVBS signal input to EXT8 go out?

                                            
Is a CVBS signal input to pin (6) of EXT8 (J505)?

NO

Check the setting of an external input device that connects with 
EXT8.

YES

Is CVBS signal from EXT8 (J505) sent to pin (12) of IC503 
(AV_SW.)?

NO

Check the line between J505 and IC503.

YES

Is CVBS signal output from pin (71) of IC503?

NO

Is V3_PLUG detection signal to pin (13) of IC503 input from pin 
(7) of EXT8 (J505)?

YES

NO

Check the IC503 and their peripheral circuits.

Is CVBS signal sent to pin (V4) of IC8101 (DIGITAL AV 
DECODER & MAIN CPU & VIDEO PROCESSER) from pin (71) 
of IC503?

NO

Check the line between IC503 and IC8101.

YES

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