Sharp LC-37XD1E Service Manual page 46

LC-37XD1E/RU
<When EXT3 is used for external input>
No EXT3 output of the external input system.
Checklist;
1) Is"INPUT SOURCE" button
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) ?
YES
Is composite video signal
(IN3- CVBS) sent to
input terminal pin
(4) of IC1201 (SW) ?
YES
Is composite video sig-
nal (IN3(V)) sent to input
terminal pin (AB20) of
IC3002
(V-PRO) ?
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)?
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)?
YES
Is power (+12V) supplied to pins (1) - (5) of CONNECTOR CN2 in LCD-CONT-UNIT?
YES
Replace LCD-CONT-UNIT.
on the remote control set up correctly? ...E See the operation manual and set "INPUT SOURCE" to "EXT3".
NO Check external connec-
tion, input setting, A/V-
IN-TERMINAL (J1201)
and peripheral circuits.
NO Check A/V-I N-TERMI-
NAL (J1201) and periph-
eral circuits.
NO Check CONNECTOR
(SC2703/P1102 ),
IC3002 (V-PRO.) and
peripheral circuits.
No picture on the display (5)
No EXT3-Y/C output of the external input system.
Is Y/C signal sent to pins
(11) and (7) of S-TERMI-
NAL (J1201) ?
YES
Is Y3 signal (IN3-Y) sent
to Input terminal pin (6) of
IC1201 (SW) ?
YES
Is Y/C signal (IN3Y/IN3C)
sent to input terminal pins
(AB20) and (AC20) of
IC3002 (V-PRO.) ?
YES
4 – 15
NO Check external connection,
input setting, S-TERMINAL
(J1201) and peripheral cir-
cuits
NO Check S-TERMINAL
(J1201) and peripheral cir-
cuits.
NO Check CONNECTOR
(SC2703/P1102 ), IC3002
(V-PRO.) and peripheral cir-
cuits.
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.
NO Check CONNECTOR
(SC2302, CN1) and HAR-
NESS WIRE (LV).
NO Check CONNECTOR
(CN2,P707) and HAR-
NESS WIRE (PL).