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LC-40LE820E (serv.man5). Troubleshooting - Sharp TV Service Manual (repair manual). Page 8

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LC-40/46/52LE820E, LC-40/46LU820E
7 – 8
[External input EXT1] No picture on the display (4)
Does not the picture of the CVBS signal input to EXT1 go out?
                                            
Is CVBS signal sent to pin (14) of EXT1 (SC505)?
NO
Check the setting of an external input device that connects with 
EXT1.
YES
Is CVBS signal from EXT1 (SC505) sent to pin (AG29/
SC1_CVBS_Y) 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 (5)
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 (6)
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.”
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