Sharp LC-37XD1E, Service Manual

Page: 46 / 198

LC-37XD1E/RU
4 – 15
<When EXT3 is used for external input> No picture on the display (5)
No EXT3 output of the external input system. No EXT3-Y/C output of the external input system.
Checklist;
1) Is"INPUT SOURCE" button on the remote control set up correctly? ...E See the operation manual and set "INPUT SOURCE" to "EXT3".
2) Is MENU-Picture-Backlight/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 (1) of A/V-IN-
TERMINAL
(J1201) ? NO Check external connec-
tion, input setting, A/V-
IN-TERMINAL (J1201)
and peripheral circuits. Is Y/C signal sent to pins
(11) and (7) of S-TERMI-
NAL (J1201) ? NO Check external connection,
input setting, S-TERMINAL
(J1201) and peripheral cir-
cuits
YES YES
Is composite video signal
(IN3- CVBS) sent to
input terminal pin
(4) of IC1201 (SW) ? NO Check A/V-I N-TERMI-
NAL (J1201) and periph-
eral circuits. Is Y3 signal (IN3-Y) sent
to Input terminal pin (6) of
IC1201 (SW) ? NO Check S-TERMINAL
(J1201) and peripheral cir-
cuits.
YES YES
Is composite video sig-
nal (IN3(V)) sent to input
terminal pin (AB20) of
IC3002
(V-PRO) ? NO Check CONNECTOR
(SC2703/P1102 ),
IC3002 (V-PRO.) and
peripheral circuits. Is Y/C signal (IN3Y/IN3C)
sent to input terminal pins
(AB20) and (AC20) of
IC3002 (V-PRO.) ? NO Check CONNECTOR
(SC2703/P1102 ), IC3002
(V-PRO.) and peripheral cir-
cuits.
YES YES
Is LVDS video signal (TA1
±
-TD1
±
) sent to pins (AB8)/(AC8) - (AB3)/(AC3) of IC3002 (V-PRO.), and
is CLK signal (CK1
±
) sent to pins (AB5)/(AC5)?
Is LVDS video signal (TA2
±
- TD2
±
) sent to pins (AC2)/(AC1) - (V2)/(V1) of IC3002 (V-PRO.), and is
CLK signal (CK2
±
) sent to pins (Y2)/(Y1)?
NO Check pins (G14)/(U10) of
BU3.3V line of IC3002 (V-
PRO.), pins (G10)/(N17) of
BU2.5V line,pins (U16)/
(G12) of BU1.8V line and
peripheral circuits.
YES
Is LVDS video signal (TA1
±
- TD1
±
) sent to pins (3)/(2) -(12)/(11) of CONNECTOR CN1 of LCD-
CONT-UNIT, and is CLK signal (CK1
±
) sent to pins (10)/(9)?
Is LVDS video signal (TA2
±
- TD2
±
) sent to pins (17)/(16) -(26)/(25) of CONNECTOR CN1 of LCD-
CONT-UNIT, and is CLK signal (CK2
±
) sent to pins (24)/(23)?
NO Check CONNECTOR
(SC2302, CN1) and HAR-
NESS WIRE (LV).
YES
Is power (+12V) supplied to pins (1) - (5) of CONNECTOR CN2 in LCD-CONT-UNIT? NO Check CONNECTOR
(CN2,P707) and HAR-
NESS WIRE (PL).
YES
Replace LCD-CONT-UNIT.