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Ignacio Montez Posted on Apr 06, 2016
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I have sound and picture, but half of the screen is darker than the other half. Would that be the backlight?

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Electro Med Services

Electro Med Services

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  • Element Elec... Master 6,694 Answers
  • Posted on Apr 06, 2016
Electro Med Services
Element Elec... Master
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Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://electro-medical.blogspot.com/
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.

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0helpful
1answer

Have a vizio e50x-e1 that half the screen the left half was darker then the right the next day turned tv on again this time whole screen is dark sound still works but nothing else
backlight problem.
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VIZIO TV: XVT3D554SV, Right half of screen is at 1/2 brightness.
Your backlights have failed on that side of the screen and would need replacing...if you do it yourself the cost isn't to bad but its not an easy job changing the lamps, its time consuming, most the sets I have repaired with this issue I end up with between 100 and 150 in them
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TCL L46E5300F flatscreen half right side screen is darker than left side
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Jan 09, 2014 • Vizio VW46LFHDTV10A 46 in. LCD TV
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Have sound and part of the screen is very dull
Mostly LCD sets have backlights---set will have a board that drives top half and another that drives lower half--some are called sustain boards etc and even 2 are combined into one.
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May 25, 2012 • LG MZ-42PZ44 42 in. EDTV-Ready Plasma...
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Samsung LCD 46 inch half of the screen is darker than the other half.
Hi, while fixing another persons lcd tv i used lower rated power supply to try to fire up the tv ( picture-no sound) the bulbs ( actually cold cathode fluorescent ) lit up but only halfway. So sounds like the power supply for your backlight has gotten weak. You may try a workaround I've used on personal equipment, try turning down brightness on tv-this may,if your lucky, even out the brightness. hope this helped. Prodzilla
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Mar 30, 2011 • Samsung LN46A650 46 in. LCD HDTV
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The top half of the screen is slightly duller than the lower half, this is across the whole screen. When initially switched on the top 1/4 (whole way across) is slightly darker for a split second then it...
sounds to me like the fluorescent backlighting is going bad in the top half of your set.
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Jul 20, 2017 • JVC LT-32X576 32 in. LCD Television
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Screen Half darker
It sounds like your backlight isn't working properly. LCD screens have backlights that illuminate the colors produced upon their surfaces, so that you can easily see the screen without an external light source. In your case, it sounds like your backlights either aren't cailbrated, are damaged, or were produced unevenly.

There is most likely not a fix for this, though most all LCD screens have some form of light distortion. My own LCD screen is slightly brighter around the edges, where the backlights are located, but this is only noticeable when displaying a completely black screen.
Read full answer
Jun 22, 2009 • LG 22" FLATRON LCD Monitor
1helpful
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Screen is half dark and whistles when battery is unplugged
You could have a defective screen, either a faulty inverteror a CCFL lamp - follow this to determine the fault.

Defective CCFL backlight, it may have the following symptom:
  • Screen flashs on red/pink and off.
  • Picture stays on in red and slowly be come normal.
  • Picture flickering with dim display.
  • Picture flickering on and off.
All these symptoms indicate that the LCD backlight lamp (CCFL Lamp) has reached the end of the life and all you need to do is replacing the CCFL lamp

Connect an external monitor to your laptop and power it up, if you see the normal Windows images then the video card and laptop is OK and the problem is definitely the backlight.

Dim image and/or dark display on the laptop's LCD screen indicates a faulty LCD backlight and it could be the inverter that supplies high voltage to the CCFL lamp or it is the CCLF lamp is nearly burnt out or burnt out, most likely this is the case.
The inverter can be replaced easily but the CCLF lamp is more time consuming and requires soldering skills.
Check out www.lcdparts.net for parts, repair service and DIY info.
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Apr 15, 2009 • Dell Inspiron 1521 Laptop
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One half of screen sees darker than other
Problems described are related to Backlight.It is possible that backlights of affected area have become weak.
You may need to contact the company for repairs and Yes the Repairs may not be cheap.
Samir
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