Read Sharp LC-52XS1E (serv.man4) Service Manual online
LC-52XS1E/RU/LC-65XS1E/RU
4 – 9
<At the time of AVC connection> No picture on the display (1)-2
No picture appears on LCD at the time of AVC connection.
Checklist:
1) Is “INPUT SOURCE” button
on the remote control set up correctly?
• • • Set it as the external input of the favorite with the INPUT
SOURCE button
of the remote control.
2) Is MENU-Picture-Backlight/Contrast/Brightness set to “MIN”?
• • • Set it to an appropriate level.
3) Is the level of pin (12) (13) of IC6004 (TMDS-SW) at “H”?
• • • These are serial communications lines (I2C) for the control. If it is “L”, check
whether something pulls it to “L”.
4) IF-UNIT power supply input
• • • Check whether BU5V is inputted into PD (P5801) 6/7pin, and UR15V is inputted into PE (P5802) 1/2pin.
5) LCD-CTL-UNIT power supply input
• • • Check whether VCC (12V) is inputted into LC (P4802) 9/10pin.
(IF-UNIT)
YES
IF-UNIT output part: Is the LVDS_ [TA1:TD1]
± signal outputted
to the pin (40-28) of LW connector (SC7901)? and Is the
LVDS_[TA2:TD2]
LVDS_[TA2:TD2]
± signal outputted to the pin (26-14)?
(LCD-CTL-UNIT)
YES
At the FPC connector (SC7001) (39-79) pin of a LCD-CTL-UNIT
output part Is [P00:P61]
output part Is [P00:P61]
± signal outputted? Check whether
3.3V are supplied to 2/3 pin, VLS15.6V is supplied to 12/13 pin,
and -6V/35V are supplied to 34/35 pin.
and -6V/35V are supplied to 34/35 pin.
YES
Check the soldering of connector and driver IC of the LCD-
PANEL board. Or exchange LCD.
PANEL board. Or exchange LCD.
NO
At the pin (2-14) of LW connector (SC4801) of LCD-CTL-UNIT
input part, Is LVDS_[RA1:RE1]
input part, Is LVDS_[RA1:RE1]
± signal inputted?
Is LVDS_[RA2:RD2]
± signal inputted into the pin (26-14)?
Is VCC (12V) inputted into the pin (9/10) of LC connector
(P4802)?
(P4802)?
NO
Check the loose connection of LW harness, and disconnection.
or check soldering of SC4801.
or check soldering of SC4801.
YES
Replace LCD-CTL-UNIT.
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