LC-52XL1E (serv.man3). Adjustment Procedure - Sharp TV Service Manual (repair manual). Page 12

LC-46XL1E/RU, LC-52XL1E/RU

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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 “EXT1”.

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 connection, 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

±~TE1±) 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

±~TE2±) 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

Check the FRC- circuit.
Refer to sheet of FRC (100Hz). (P4-20)

YES

Is LVDS video signal (TA1

±~TE1±) sent to pins (3)/(2) - (18)/(17) 

of CONNECTOR CN1 of LCD-CONT-UNIT, and is CLK signal 
(CK1

±) sent to pins (12)/(11)?

Is LVDS video signal (TA2

±~TE2±) sent to pins (21)/(20) - (36)/

(35) of CONNECTOR CN1 of LCD-CONT-UNIT, and is CLK sig-
nal (CK2

±) sent to pins (30)/(29)?

NO

Check CONNECTOR (SC6211, CN1) and HARNESS WIRE.

YES

Is power (+12V) supplied to pins (1) - (5) of CONNECTOR CN3 in 
LCD-CONT-UNIT?   

NO

Check CONNECTOR (CN3, PL) and HARNESS WIRE (PL).

YES

Replace LCD-CONT-UNIT.