LC-37XD1E (serv.man4). Troubleshooting Table - Sharp TV Service Manual (repair manual). Page 13

LC-37XD1E/RU

4 – 13

<When EXT1 is used for external input>                                                                       No picture on the display (3)-2

No EXT1-Y/C 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-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 Y/C signal sent to pins 
(20) and  (15) of SCART1 
(J1101) ?   

NO

Check external  connec-
tion, input  setting, 
SCART1  (J1101) and  
peripheral circuits.     

YES

Is Y/C signal  (Y1/C1) 
sent to input terminal  
pins (AB22) and (Y19) of 
IC3002  (V-PRO.) ?   

NO

Check  CONNECTOR  
(SC2702/P1101 ),  
SCART1 (J1101)  and 
peripheral  circuits..     

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.