Sharp AQUOS LC-42AD5E, Service Manual

Page: 52 / 144

LC-42AD5E/RU/S
4 – 14
<When EXT4 is used for external input> No picture on the display (11)
No EXT4 (15pin-D-SUB terminal) output of the external input sys-
tem.
Checklist:
1) Is “INPUT SOURCE” button
on the remote control set up correctly?
•••
See the operation manual and set “INPUT SOURCE” to “EXIT4”.
2) Is MENU-PICTURE-CONTRAST/BRIGHTNESS set to “MIN”?
•••
Set it to an appropriate level.
3) Check the connection to the external device
•••
Connect it correctly as per the operation manual for the device.
Is “EXT4” selected with “INPUT SOURCE” button on the remote
control?
NO Select “EXT4” with “INPUT SOURCE” button on the remote con-
trol.
YES
Is D-SUB-COMPONENT signal (PCV_R/G/B) sent to pins (1), (2)
and (3) of EXT4-TERMINAL (SC2303)? NO Check D-SUB-adaptor and external connection.
YES
Is D-SUB-COMPONENT signal
(PCV_R/G/B=VIN19/20/21) sent to pins (174), (173) and (172) of
IC3002 (VCT)? NO Check EXT4-TERMINAL and peripheral circuits.
YES
Refer to “No video output in all modes”.