LC-52XL1E (serv.man3). Adjustment Procedure - Sharp TV Service Manual (repair manual). Page 8

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

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<On input of the tuner (U/V)>                                                No picture on the display (1)

                                            
No picture appears on LCD during the tuner (U/V) reception.

                                            
Checklist:

1) Is “INPUT SOURCE” button

on the remote control set up correctly? ... See the operation manual and set “INPUT SOURCE” to “TV”. 

2) Is MENU-Picture-Contrast/Brightness set to “MIN”? ... Set it to an appropriate level.
3) Is ANT-CABLE disconnected or connected improperly? ...Connect it correctly as per the operation manual.

YES

Is level of pins (15) and (14) of tuner (TU201) and pins (12) and 
(2) of IC204 (MULTI) at H?

NO

These are communications lines for control (I2C). Follow the path 
and check whether they are forced to L (PULL_DOWN).

YES

Is the video signal (IF) sent from pin (17) of tuner (TU201)?

NO

Check the tuner (TU201) and peripheral circuits.

YES

Is the video signal CVBS sent to pin (AC23) of lC3002 (V-PRO.)?

NO

Check CONNECTOR (P201/SC2705) 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 CN2 of LCD-CONT-UNIT, and is CLK sig-
nal (CK2

±) sent to pins (30)/(29)?

NO

Check CONNECTOR (SC6211, CN1) and HARNESS WIRE 
(LV).

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.