Sharp LC-37SD1E, Service Manual

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LC-37SA1E/RU
4 – 23
<When EXT5 is used for external input> No picture on the display (7)
No EXT5 (HDMI) 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 “EXT5”.
2) Have you checked the type video signal sent from HDMI-connected external device?
•••
Confirm the type (it should “RGB”, “YCbCr 4:4:4” or
“YCbCr 4:2:2”).
3) Have you checked the type of Color Matrix sent from HDMI-connected external device?
•••
Confirm the type (it should be “ITU601” or
“ITU709”.)
4) Is ANT-CABLE disconnected or connected improperly?
•••
Connect it correctly as per the operation manual.
YES
Is “EXT5” selected with “INPUT SOURCE” button on the
remote control?
NO
Select “EXT5” with “INPUT SOURCE” button on the remote
control.
YES
Is the type of video signal (Signal Type) from HDMI-connected
external device set? NO From MENU-Option-HDMI Setup-Signal Type, select a signal
type (“RGB”, “YCbCr 4:4:4” or “YCbCr 4:2:2”).
YES
Is the type of color signal (Color Matrix) from HDMI-connected
external device set? NO From Option-HDMI Setup-Color Matrix, select a color signal type
(“AUTO”, “ITU601” or “ITU709”)
YES
Is TMDS data (RX*
±
signal) sent to pins (1) - (12) of EXT5 (HDMI)
terminal (SC1901)?
NO Is I2C signal (SDA/SCL signal) sent to pins (16) and (15) of
EXT5 (HDMI) terminal?
Check external connection and peripheral circuits.
YES
Is 8bit-DIGITAL signal (HDMI- R/G/B) sent from pins (110) - (144)
of IC1905 (HDMI-RECEIVER)? NO Check power supply (3.3/1.8V) pins (99) and (74) of IC1905,
SDA/SCL signal pins (29) and (30), and peripheral circuits.
YES
Is 8bit-DIGITAL signal (HDMI- R/G/B) sent to pins (73) - (50) of
IC3002 (VCT)? NO Check SDA3/SCL3 signal pins (27) and (28), interface between
IC1905 and lC3002, 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.