Sharp LC-37GD9E Service Manual page 50

Troubleshooting Table (continued)
TROUBLESHOOTING TABLE
<When EXT4 is used for external input>
No EXT4 (15pin-D-SUB-terminal)
output of the external input system.
Checklist:
1) Is "INPUT SOURCE" button
2) Connect the included D-SUB-Adapter-Cable to the COMPONENT terminal of an external device. ··· See the operation manual (use a commercially
available Component-Cable to connect to the external device).
3) Is ANT-CABLE disconnected or connected improperly? ··· Connect it correctly as per the operation manual.
YES
Is "EXT4" selected with
button on the remote control?
YES
Is D-SUB-COMPONENT signal
(PCV_R/G/B) sent to pins (1),
(2) and (3) of EXT4-TERMINAL
(SC2303)?
YES
Is D-SUB-COMPONENT signal
(PCV_R/G/B=VIN19/20/21))
sent to pins (174), (173) and
(172) of IC3002 (VCT)?
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)?
YES
Is LVDS signal (LVDS_0N/0P-3N/3P) sent to pins (12) and (13) - (24) and (25) of CONNECTOR CN1 in LCD-
CONT-UNIT, and is CLK signal (LVDS_CN/CP) sent to pins (21) and (22)?
YES
Is power (LCD5V) supplied to pins (2) – (5) of CONNECTOR CN1 in LCD-CONT-UNIT?
YES
Check IC1705 and peripheral parts.
No picture on the display (6)
on the remote control set up correctly? ··· See the operation manual and set "INPUT SOURCE" to "EXT4".
NO
Select "EXT4" with button
on the remote control.
NO
Check D-SUB-adaptor and
external connection.
NO
Check EXT4-TERMINAL and
peripheral circuits.
Replace LCD-CONT-UNIT.
(Continued)
YES
Is IC 1705 supplying LCD 5V?
Change IC1705.
37
53
LC-26GA5E
LC-32GD9E
LC-32GA5E
LC-37GD9E
LC-32/37GD8E/RU
LC-32/37BT8E/RU
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.
NO
Check CONNECTOR (P2305,
CN1) and Hareness Wire (LV).
NO
Is LCD5V supplied to pins (31) -
(28) of CONNECTOR (P2305)?
NO
Check HARNESSWIRE (LV).
NO
YES