LC-60LE925E (serv.man18). Troubleshooting Table - Sharp TV Service Manual (repair manual). Page 10

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LC-46/60LE925E (1st Edition)
7 – 10
[External input EXT1] No picture on the display (6)
Does not the picture of the Y/C video signal input to EXT1 go out?
                                            
Is Y/C video signal sent to pins (14)/Y and (4)/C of EXT1 
(SC505)?
NO
Check the setting of an external input device that connects with 
EXT1.
YES
Is Y/C signal from EXT1 (SC505) sent to pins (AG29/
SC1_CVBS_Y) and (AG28/SC1_C1) of IC3302 (Digital AV 
decode & Main CPU)?
NO
Check the line between SC505 and IC3302.
YES
Refer to “The picture doesn’t appear in all modes.”
[External input EXT1] No picture on the display (7)
Does not the picture of the R/G/B signal input to EXT1 go out?
                                            
Is RGB1 signal sent to pins (4)/RGB_IN_RED/C, (6)/
RGB_IN_GREEN and (8)/RGB_IN_BLUE of EXT1 (SC505)?
NO
Check the setting of an external input device that connects with 
EXT1.
YES
Is RGB1 signal from EXT1 (SC505) sent to pins (AH22/RED1), 
(AJ22/GREEN_1) and (AJ21/BLUE_1) of IC3302 (Digital AV 
decode & Main CPU)?
NO
Check the line between SC505 and IC3302.
YES
Refer to “The picture doesn’t appear in all modes.”
[External input EXT2] No picture on the display (8)
Does not the picture of the CVBS signal input to EXT2 go out?
                                            
Is a CVBS signal input to pin (3) of EXT8 (J505)?
NO
Check the setting of an external input device that connects with 
EXT2.
YES
Is CVBS signal sent to pin (AE29/CVBS__IN) of IC3302?
NO
Check the line between J505 and IC3302.
YES
Refer to “The picture doesn't appear in all modes.”

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