Sharp LC-70LE740E Service Manual page 134

LC-60/70LE740E/RU,741E/S,743E,60LE840E/RU,841E/S,843E,80LE645E/RU,646E/S,648E (1st Edition)
Does not the picture of the R/G/B signal input to EXT1 go out?
Do RGB signals input to pins [15/RGB_IN_RED/C, 11/
RGB_IN_GREEN and 7/RGB_IN_BLUE] of EXT1 (SC505)?
Do RGB signals from EXT1 (SC505) input to pins [AK19/
SC_PR0P, AM19/SC_PB0P and AM18/SC_Y0P] of IC3303 (Dig-
ital AV decode & Main CPU)?
Refer to "No picture on the display (1)".
Does not the picture of the CVBS signal input to EXT2 go out?
Does CVBS signal input to pin [5] of EXT2 (J511)?
Is CVBS_PLUG [4/CVBS1_PLUG] of J511 at "L"?
Does CVBS signal input to pin [AJ23/CPU_CVBS1P] of IC3303
(Digital AV decode & Main CPU)?
Refer to "No picture on the display (1)".
[External input EXT1] No picture on the display (7)
YES
YES
[External input EXT2] No picture on the display (8)
YES
YES
NO Check the setting of an external input device that connects with
EXT1.
NO Check the line between SC505 and IC3303.
NO Check the setting of an external input device that connects with
EXT2.
NO Check the line between J511 and IC3303.
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