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Backlight on lcd not lit, what could cause this

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More than likely the ballast unit has failed. That is the unit that provides the voltages required to run the back light, have you got a picture on a secondary monitor?. If you haven't then you have video drive problems but I won't go into that side as I expect it is a power problem with the ballast unit.
Browse ebay for a replacement. They are fairly easy to replace as they are situated at the base of the screen and are accessible by removing the rubber bungs that cover the screws on each corner of the screen lid.
Hope this helps.

Posted on Nov 14, 2010

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Posted on Jan 02, 2017

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Sanyo DP46142 TV comes on for approximately 30 seconds and then screen goes black. Power LED stays on.


Sounds like a backlight problem to me. If you input a signal to the HDMI or Composite input and then it goes black have you tried taking a flashlight to the screen to see if the picture is still there but just dark? That would indicate a backlight issue. That model appears to be an LED edge lit backlight, so if the picture is still there after going black your going to have to trace out the backlight circuit and see whats going on. Usually with LED backlighting if it comes on at all then the LED's are good, its just the driver supply thats failing to keep them on. Some TV's have a small separate board that provides the backlight control, but i suspect with this model its on the power supply board and not the motherboard. Have you checked that board? It could be bad caps on the power supply board, check the voltages to the backlighting when it lights up and then when it goes dark. It could just be some failed capacitors on the power supply causing that voltage rail to drop off.

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1 Answer

Parts needed for VIZIO TV with backlight out


You can fix it if you have some repair experience, you will need the power inverter board and/or the backlight lamps of the LCD screen, first try the power inverter board, the function of it is to up the voltage from 12/24/48V to a 800-1500V needed for the LCD back lamps.

Nov 17, 2014 | Vizio XVT473SV 47 in. LCD HDTV

1 Answer

What is a backlight on my 47"3d474sv tv? and How to fix it?


to light up an lcd display a set of thin flouro lights are lit behind the display,these are thin and stretch from left to right,depending on the size and model there can be 12 or more tubes used,
A fault condition can be caused by either one or more tubes going faulty or by a faulty component or components on the inverter board
you would require some test equipment to diagnose with any accuracy.
Because the above lights are found behind the lcd they are called backlights..

it is very rare for a relatively new set to have faulty tubes so i can suggest a replacement inverter board

Len..

Aug 29, 2014 | Televison & Video

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My screen is dark but the sound is ok


SOUNDS LIKE EITHER THE INVENTER BOARD IS PLAYING UP OR THE POWER SUPPLYBOARD,LOOK FOR FAULTY CAPACITORS.ITS THE BACKLIGHT THAT LETS YOU SEE WHAT IS BEING SHOWN ON THE LCD SCREEN BY LIGHTING IT UP,IF YOU LOOKED CAREFULLY OR SHOWN A TORCH ON IT YOU WOULD SEE THE SCREEN.SOMETIMES IF YOU MANAGE TO TURN THE BACKLIGHT DOWN A BIT BY TURNING DOWN THE BRIGHTNESS ON TV,THE BACKLIGHT WILL COME ON AGAIN,IT IS CUTTING OUT DUE TO LACK OF POWER OR FAULTY CAPACITORS ON THE PSB.DO SOME GOOGLE SEARCHING,GOOD LUCK

Mar 19, 2013 | Sony BRAVIA KDL-52V4100 52" LCD TV

1 Answer

Acer aspire one screen barely displayed


There are two causes, the inverter board, " just under the LCD screen" more likely, or the backlight behind the display, "less likely"

Apr 18, 2012 | Acer Aspire One PC Notebook

1 Answer

Monitor screen will not stay lit. It will only stay lit for a second then goes black.rq


The problem can be caused by bad caps in the power supply, bad inverter backlights circuits, bad lamps. Look for bad caps first, then post back what you find so we can guide you further, see example of failed monitors due to bad caps here: http://s807.photobucket.com/home/budm/allalbums

Jan 30, 2010 | HP w1907 LCD Monitor

1 Answer

Where do i find a bulb for it


There is no bulb. The LCD screen is lit by a backlight. You can check on ebay for a backlight. Good Luck

Nov 24, 2009 | Samsung SyncMaster 203B LCD Monitor

1 Answer

No picture sometimes


If the screen is still lit up then it's your lcd controller which will cause the screen to just be lit up but blank. If the screen does not stay lit up then it's your backlight inverter(s) in this case you should be able to hold a flashlight up and still see the picture on the screen just very dark.

Aug 22, 2009 | Sharp AQUOS LC-32D43U 32 in. LCD...

1 Answer

Dark screen


if the picture is REALLY dark, like you can just barely see it in a lit room, then the backlight might not be lit. LCD TVshave backlight that shines through the LCD screen which allows you to see the picture.

If it's not the backlight then it would be the brightness/contrast settings that need to be adjusted. If the picture used to be normal and all of a sudden went dark, verify the backlight. Normally you can look through the slots on the top of the set and determine if the backlight is on. If you can see a bright light through any of the slots, the backlight is probably OK... go after the brightness/contrast settings.

Mar 25, 2008 | Vizio L37 Television

1 Answer

Monitor


hi,
Unplug the monitor from the back of your computer tower. If the LCD is not displaying any Video the monitor has gone bad. If it displays self test feature check window. It could be a graphic card driver problem.

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