Question about Samsung LN-T4042H 40 in. LCD HDTV

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Inverter Hi Lone99star, I just received my inverter from and I need assistance putting it on because my attempt came up with the same result sound with no picture. Can you help me? Samsung LN-T4042H 40" lcd Thanks, Mike

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Verify that the INVERTER is working correctly and outputing the correct voltages.
If that is the case you should look at the CCFT (Cold Cathode Fluorescent Lamp) what are pencil thin fluorescent lights around the LCD panel. They claim these will last 50 - 60 K hours but they are still lights.

Posted on Feb 23, 2009


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Has sound , but picture is dim and red looking


First, connect the TV to a DVD player and observe if problem will still be there. If problem persists, then it mean the fault is from your TV's LCD inverter. Sometimes, a defective video cord can cause this type of problem, this is why I asked you to connect the TV to a DVD player.....

Your TV has a long board that is called LCD inverter board. This board is defective or dying.

This long LCD inverter board's only job is to provide the TV LCD screen panel to have a back-light to the LCD screen panel to produced a picture.

Try websites like, to buy a refurbish long LCD inverter board for the replacement.

If you are not a TV expert, please take the TV to a repairman for the LCD inverter replacement. This is not expensive to fix...

Note that TV store current, so wait for some minutes before attempting to open the TV's back cover.


Apr 15, 2011 | LG 42PC3D 42 in. Plasma Television

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Sound good, no picture

Now turn on the tv? Have a flickers of picture a few sec. than dies have sound left only?Yes,than the long LCD inverter board it dead.This long LCD inverter board help the LCD screen panel to have a backlight to produced a picture.Tries websites like, to buy a refurbish long LCD inverter board for the replacement.

Aug 03, 2010 | Sharp LC-19SB25U 19 in. LCD HDTV

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The picture went blank. but volume and inputs still work

The 2 long boards call the LCD inverter boards is dead.That why ur tv is not getting a backlight to ur LCD screen panel to get the picture.Take ur tv aparts change the 2 long LCD inverter boards,u will get a backlight back to the LCD screen an get the picture.Tries websites like, to buy the 2 long inverter boards for the replacement.

Jun 22, 2010 | Philips 42PFL5332D 42 in. LCD Television

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Turn tv on get sound but no picture

Ur LCD inverter board is dead.This LCD inverter board provide the backlight for LCD panel screen to get a picture.Tries websites like, to buy a reburbish LCD inverter board for the replacement.This LCD inverter board is a long board in shape form.

May 05, 2010 | Westinghouse LTV-32w1 32 in. HD-Ready LCD...

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Sound is clear but no picture

Ur LCD inverter board is dead.Replaced this LCD inverter board will get ur picture back.Tries websites like, to buy a refurbish LCD inverter for the replacement.It a long board in shape.

May 04, 2010 | Vizio L32 32 in. LCD HDTV

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Sound but no picture

Ur LCD inverter board is dead.This LCD inverter board,help to get the LCD screen,to have backlight go throught the Tuner board to get the cable or free air tv signal to get a picture.Tries websites like, to buy a refurbish LCD inverter board for the replacement.It a long board in shape.

May 02, 2010 | Televison & Video

1 Answer

Screen does not light up

Hi vic2tries,
You have a bad Backlight Inverter.
The part is fairly cheap, you can find one at
Depending on the model of your Toshiba you may be able to install it yourself, if not you should buy it and take it to a repair shop for installation. 
If you decide to install it yourself let me know and I will walk you through.
Please rate this solution, the only compensation I receive is a good rating from you.

Apr 29, 2009 | Toshiba Computers & Internet

1 Answer

How do I replace the backlight in a ViewSonic N1800TV?

Hi Jake.
You most likely have a bad backlight inverter, there is a small chance it could be a power supply issue but I doubt it.
Replacing the inverter should be straight forward and easy but working with high voltage electronics can be very dangerous, I must tell you that it should be repaired be a trained professional but if you decide to do it yourself I will walk you through it.
You can buy the inverter at When the part comes in get back with me and we can proceed in a chat from there.
In the meantime please rate me a FixYa.

Feb 24, 2009 | ViewSonic N1800TV 18 in. LCD Television

1 Answer

No picture, just audio

I am happy to help, we need to check the backlight inverter.
  1. Turn tv on and get to a point that you have audio.
  2. Take a flashlight and shine it on the screen.
  3. Look very closely at the screen for a very dark video image.
If you see an image you have a bad inverter, you should be able to replace it yourself. I can walk you through in chat. Let me know your findings. Lone99star 

Jan 20, 2009 | Philips 50PF9956 50 in. HD-Ready Plasma...

1 Answer

Samsung LNT4042H Audio but no picture...

Hi mgflores84
I have found the inverter at Shopjimmy, I have never recieved a bad board from these folks and they will take them back if they are bad. Here is a link  Make sure to compare your board to the one in the picture. Let me know if I can assist further, We can go into chat when you recieve the board and do the install. lone99star

Jan 11, 2009 | Samsung LN-T4042H 40 in. LCD HDTV

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