Read Sharp LC-70LE741E (serv.man11) Service Manual online
LC-60/70LE740E/RU,741E/S,743E,60LE840E/RU,841E/S,843E,80LE645E/RU,646E/S,648E
6 – 54
[External input EXT1] No picture on the display (7)
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)?
NO
Check the setting of an external input device that connects with
EXT1.
EXT1.
YES
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)?
SC_PR0P, AM19/SC_PB0P and AM18/SC_Y0P] of IC3303 (Dig-
ital AV decode & Main CPU)?
NO
Check the line between SC505 and IC3303.
YES
Refer to “No picture on the display (1)”.
[External input EXT2] No picture on the display (8)
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”?
NO
Check the setting of an external input device that connects with
EXT2.
EXT2.
YES
Does CVBS signal input to pin [AJ23/CPU_CVBS1P] of IC3303
(Digital AV decode & Main CPU)?
(Digital AV decode & Main CPU)?
NO
Check the line between J511 and IC3303.
YES
Refer to “No picture on the display (1)”.
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