Tip & How-To about Televison & Video

How to restore your LCD TV's blank picture

Is your LCD TV powering on and playing sound, but displaying only a black screen even though your screen isn't cracked? If so, you may be in need of backlight repair.
There is a florescent tube backlight in most LCD TVs located right behind the screen itself. Its purpose is to light up the images displayed by the screen; without the backlight, these images are virtually invisible.
It is not always the florescent tube (or tubes) themselves that need to be replaced, but sometimes their inverter. An inverter is a special circuit that powers florescent lights by feeding them AC (alternating current) at a high frequency.
If either of these are damaged, it will cause the symptoms described above. But how do you know if you need to replace them?
Upon opening up your TV, the problems may be apparent-- and they may not. The tubes may be cracked, but even if they show no obvious damage, they could still be malfunctioning. The same goes for the inverter, usually there will be no signs even if they are damaged. Although sometimes there may be visible scorch marks on the inverter board. The point is that you may have to conduct a little trial and error to find out which is your problem.
But where to find replacements? A good source is ebay or any site individuals sell their items. You see, when people break their LCD screens, they want to try and recoup their losses a little. This means stripping down their TV and selling the parts. Just search your TV's make and model along with the words "inverter" or "backlight." You may also try the words "as is" or "for repair" to find entire broken TVs for sale that you can strip down yourself.
If you choose to dismantle your TV in any way please be sure to unplug it first, and just be careful in general; if you don't know what your doing, you coule make matters worse. Also remember that there are no guarantees. This solution has worked for me multiple times in the past, but your situation could be very different.

Well that's about it, I hope this helps people. I just joined this site today, and I've already given this exact advice to like six people so I figured it was a good subject to write my first tip thing about.
Good luck.
-- Kyle Brownell

Posted by on

Televison & Video Logo

Related Topics:

Related Questions:

1 Answer

Soft "Pop", Then Black Screen. Sound is OK.


First check the inverter for any burst capacitors and the display boards.

Aug 28, 2012 | Toshiba 20DL74 20 in. EDTV-Ready LCD...

1 Answer

only used a few times and the power is on but nothing showing on the screen and theres no sound its a black ds lite


The reason the screen isn't showing-up is probably because of runny colors or blotchy colors permanently stained on the screen, even when the Nintendo DS Lite is OFF, my guess is that the liquid crystal display (LCD) is cracked. And also, there are multiple reasons for your speakers not working properly. The main reasons for the speakers not working would be the following;
  • Something small must have gotten wedged inside of the speakers.
  • A type of liquid and/or sticky substance leaked into speakers.
  • Lots of pressurized force on upper screen(which could have also caused the damage done to the screen).
What I would recommend is make an appointment with "Nintendo customer service".

Feb 16, 2010 | Nintendo DS Lite Black Console

1 Answer

No display, screen is blank even compuer is running


Can I assume (?) you re-tried firmly checking each cable connection and the power supply is soundly in place including checking the fuse in the plug That's all I can suggest as the things I would do if in your shoes.

Aug 05, 2017 | BenQ FP72G (Black, Silver) 17 inch LCD...

1 Answer

Sony KDL-32ML130 lcd tv


Not really that tough. Sounds as though the backlight is shutting down, either from a power supply failure, or a failure of the backlight circuit itself. You can verify this by holding a flashlight to the screen in the area where the menu usually appears to see if it displayed on the LCD panel with no backlight. If you can faintly see the menu displayed, your backlight has shut down and the most likely cause is the backlight inverter board, followed by the power supply and the backlights themselves which are part of the LCD panel. If you found this information answered your questions, please be sure to rate it. Thanks!

Oct 24, 2008 | Televison & Video

1 Answer

Samsung LA40R71BDX - Black screen, No picture but had sound


LCD screens are monolithic (one piece) components. They cannot be repaired, they can be replaced. One site I found for replacement info is http://www.screentekinc.com, they even have DIY info if you are so inclined. There are many other sites; do a search on "lcd repair"

May 12, 2007 | Samsung LN-S4051D 40 in. LCD Television

Not finding what you are looking for?

1,054 people viewed this tip

Ask a Question

Usually answered in minutes!

Top Televison & Video Experts

The Knight
The Knight

Level 3 Expert

74251 Answers

Cindy Wells

Level 3 Expert

5128 Answers

Electro Med Services...
Electro Med Services...

Level 3 Expert

6694 Answers

Are you a Televison and Video Expert? Answer questions, earn points and help others

Answer questions

Loading...