Read Sharp LC-60LE857E (serv.man3) Service Manual online
LC-60LE855E/K,60/70LE857E/RU,858E,70LE857K
6 – 8
[External input EXT1] No picture on the display (6)
Does not the picture of the Y/C video signal input to EXT1 go out?
Does Y/C video signal input to pins [20/Y , 15/C] of EXT1(SC505) ?
NO
Check the setting of an external input device that connects with
EXT1.
EXT1.
YES
Does Y/C signal input to pins [AR30/CPU_CVBS2P, AR28/
SC_PR0P] of IC3301 (Digital AV decode & Main CPU)
SC_PR0P] of IC3301 (Digital AV decode & Main CPU)
NO
Check the line between SC505 and IC3301.
YES
Refer to “No picture on the display (1)”
[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) ?
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 [AR28/SC_PR0P,
AT28/SC_PB0P and AP27/SC_Y0P] of IC3301 (Digital AV decode &
Main CPU)
AT28/SC_PB0P and AP27/SC_Y0P] of IC3301 (Digital AV decode &
Main CPU)
NO
Check the line between SC505 and IC3301.
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" ?
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 [AR31/CPU_CVBS1P] of IC3301
(Digital AV decode & Main CPU) ?
(Digital AV decode & Main CPU) ?
NO
Check the line between J511 and IC3301.
YES
Refer to “No picture on the display (1)”
[External input EXT3] No picture on the display (9)
Does not the picture of the COMPONENT signal input to EXT3 go out?
Do COMPONENT signals input to pins [13/COMP1_Y, 10/
COMP1_Pr, 11/COMP1_Pb] of EXT3 (J511) ?
COMP1_Pr, 11/COMP1_Pb] of EXT3 (J511) ?
NO
Check the setting of an external input device that connects with
EXT3.
EXT3.
YES
Do COMPONENT signals input to pins [AU26/COMP_Y1P), (AP26/
COMP_PR1P) and (AR26/COMP_PB1P] of IC3301 (Digital AV
decode & Main CPU) ?
COMP_PR1P) and (AR26/COMP_PB1P] of IC3301 (Digital AV
decode & Main CPU) ?
NO
Check the line between J511 and IC3301.
YES
Refer to “No picture on the display (1)”
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