Read Sharp LC-46XL1E (serv.man4) Service Manual online
LC-46XL1E/RU, LC-52XL1E/RU
4 – 8
<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.
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?
(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).
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
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.
(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)
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
(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
nal (CK2
±) sent to pins (30)/(29)?
NO
Check CONNECTOR (SC6211, CN1) and HARNESS WIRE
(LV).
(LV).
YES
Is power (+12V) supplied to pins (1) - (5) of CONNECTOR CN3
in LCD-CONT-UNIT?
in LCD-CONT-UNIT?
NO
Check CONNECTOR (CN3, PL) and HARNESS WIRE (PL).
YES
Replace LCD-CONT-UNIT.
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