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Hello All, My Sharp Roku tv, LC-50LB371U, screen went dark. When turned on I heard the chirp sound but no picture. This unit has a main, power and IR board. Any suggestions as to the likely culprit? Thanks much. The issue is not the cable box as another TV when connected to the cable box produces both sound and picture.

Posted by Andrew Hepburn on


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Brad Brown

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  • Sharp Master
  • 18,438 Answers

YOu have a bad led back light, they come in strips and are a pain the bottom to find and replace.

Posted on Mar 11, 2018

  • 1 more comment 
  • Andrew Hepburn Mar 11, 2018

    Thanks Brad, I suppose it's best to just recycle it.

  • Brad Brown Mar 12, 2018

  • Anonymous May 12, 2019

    This may help the others, 50lb371u has 3 sets of 22 leds in series. These 3 sets are individually supplied with 64 vdc or 65.5 vdc in my case. 2 sets of leds are connected to +VLED1 and -VLED1 while the other one set is connected to +VLED2 and -VLED2. Each led is powered up with 2.9 to 3 vdc forward voltage, so if the ouput voltage coming from the power board is 64 to 65.5 vdc this should be correct and the issue is most likely the led that could be shorted or open. See attached picture



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Simpson Neal

  • 236 Answers

SOURCE: tv went dead while viewing, will not power back up

You have a short somewhere in the load for the power supply. Probably the horizontal output transistor and the flyback transformer. You need to have it checked out by a tech. You may want to get an estimate. Stargazer

Posted on Mar 11, 2007


Azrael SRL

  • 11800 Answers

SOURCE: sharp lc-19sb225u tv turns on with a "white noise"

The blue screen means the processor of the tv no longer finishes the loading of the firmware - hardware fault, either the chip that stores the firmware or the processor have failed.
Since the chips are soldered on the mainboard and cannot be removed separately that means that the entire mainboard will have to be replaced. This is it
Now you must decide if it's worth paying $400 for a replacement board or it's better just to buy a new tv - i'm for the second option.

Posted on May 17, 2011

SOURCE: sharp Lc-26sb24u white screen with sound

You will get a white screen when you unplug the t-con from the main board. Doing so removes power to the LCD panel. Verify that all of your voltages from the power supply are correct. If they are, I'd look at the t-con board. It sounds like there is a problem with the t-con that is pulling down the main board.

Posted on May 11, 2012

Subair Achath

  • 181 Answers

SOURCE: Sharp Aquos 55 inch LC-55LE643U LCD TV - When turned on fades from Black to White - Still have sound. Do I need a Tcon borad or main board? Has power so I assume power supply is ok. Thanks

Check all source is same or not
Try factory reset.

Posted on Aug 02, 2016

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My Sharp Roku TV model LC-50LB371U Has no picture, no audio. When I shine a flashlight on it, I can read "Comencemos"

it means "lets start" in Spanish, but you might want to change/check the LCD backlight & inverter first. ;-)
Good luck.

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1 Answer

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