Sharp LC-37SD1E, Service Manual

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LC-37SA1E/RU
4 – 14
<When EXT1 is used for external input> No picture on the display (3)
No EXT1-Composite output of the external input system.
Checklist:
1) Is “INPUT SOURCE” button on the remote control set up correctly?
•••
See the operation manual and set “INPUT SOURCE” to “EXIT”.
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 composite video signal sent to pin (20) of SCART1 (J1101)?
NO Check external connection, input setting, SCART1 and
peripheral circuits.
YES
Is composite video signal (VIN_1) sent to input terminal pin (6) of
IC2702 (SW)? NO Check CONNECTOR (SC2702/P1101), SCART1 (J1101) and
peripheral circuits.
YES
Is composite video signal (CVBS1=VIN2) sent to input terminal
pin (190) of IC3002 (VCT)? NO Check IC2702 (SW) and peripheral circuits.
YES
Is LVDS signal (LVDS_0N/0P-3N/3P) sent from pins (141) and
(140) - (129) and (128) of IC3002 (VCTP), and is CLK signal
(LVDS_CN/CP) sent from pins (132) and (131)? NO Check pins (192), (170) and (133) of BU3.3V power line and pins
(185), (169) and (142) of BU1.8V power line of IC3002 (VCTP),
and peripheral circuits.
YES
Is LVDS signal (LVDS_0N/0P-3N/3P) sent to pins (13) and (12) -
(25) and (24) of CONNECTOR CN1 in LCD-CONT-UNIT, and is
CLK signal (LVDS_CN/CP) sent to pins (22) and (21)? NO Check CONNECTOR (P2305, CN1) and HARNESS WIRE (LV).
YES
Is power (LCD5V) supplied to pins (1) - (4) of CONNECTOR CN1
in LCD-CONT-UNIT? NO Is LCD5V supplied to pins (31) - (28) of CONNECTOR (P2305)?
Check HARNESS WIRE (LV).
YES
Replace LCD-CONT-UNIT.