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 – 55
[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)?
NO
Check the setting of an external input device that connects with
EXT3.
EXT3.
YES
Do COMPONENT signals input to pins [AM16/COMP_Y1P),
(AJ18/COMP_PR1P) and (AK17/COMP_PB1P] of IC3303 (Digi-
tal AV decode & Main CPU)?
(AJ18/COMP_PR1P) and (AK17/COMP_PB1P] of IC3303 (Digi-
tal AV decode & Main CPU)?
NO
Check the line between J511 and IC3303.
YES
Refer to “No picture on the display (1)”.
[External input PC] No picture on the display (10)
Does not the picture of the ANALOG-RGB signal input to PC_IN (15pin-D-SUB terminal) go out?
Do ANALOG-RGB and synchronized signal input to pin [(1, 2, 3)/
(PC_RED, GREEN, BLUE), (14 and 13)/(PC_VSYNC, H.Sync)]
of PC_IN (SC501)?
NO
Check the connection and setup with the external PC_IN
devices.
devices.
YES
Do ANALOG-RGB and synchronized signal input to pins [AM15/
PC_RP, AK15/PC_GP, AK13/PC_BP, and AL13/PC_HSYNC,
AM13/PC_VSYNC] of IC3303 (Digital AV decode & Main CPU)?
PC_RP, AK15/PC_GP, AK13/PC_BP, and AL13/PC_HSYNC,
AM13/PC_VSYNC] of IC3303 (Digital AV decode & Main CPU)?
NO
Check the line between SC501 and IC3303.
YES
Refer to “No picture on the display (1)”.
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