Question about Samsung LN-T4042H 40 in. LCD HDTV

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Samsung ln-t4042h turns on, plenty of sound, backlight works,...

I turn on my Samsung LN-T4042H, plenty of sound and backlight works. I know this b/c I took the back cover off so I can actually see the backlight come on. But, no picture. It turns on, but no picture (backlight works though). Someone help me out.

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Check the fuses on the T-CON board and also verify that it does have 12vdc feeding it. If you look at your screen in darkened room you will probably see slight glow on the front of the screen.
If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:

Please see my basic troubleshooting guide here:


Posted on Jul 10, 2010


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I have a samsung LN-T4042H, and one day it just randomly turned off. Now if i try to turn it on, it gives me this flicking sound. I think it might be the capacitor, any advice?

This model has a history of bad electrolytic capacitors on the power supply board. I would definately start by looking at all of them. If any of them are bulged or domed on top rather than flat, then you should replace them. Just make sure you put them back in w/ the positive and negative sides in the correct position. Good luck!

Sep 03, 2010 | Samsung LN-T4042H 40 in. LCD HDTV

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I have a Samsung flat panel television, model #LN-T4042H. When I turn the tv on, it sounds like it is turning itself off and on repeatedly for more than 5 minutes before I finally hear the beeps that...

Take ur tv aparts.The power supply board is the board that ur power A/C power cord go into it.U know basic electronic.U have soldering iron,know soldering,and solders?Check all around the power supply board.Look all around the power supply board,check and see find any defective gases leakage capacitors.These dead capacitors alway have bulges or fuff up it top.Replaced these dead gases lekage capacitors will solved ur power problems.Or tries Websites like, to buy a whole refurbish power supply board for the replacement.

May 11, 2010 | Samsung LN-T4042H 40 in. LCD HDTV

1 Answer

My ln-t4042h turns on and stays on for a while and then the screen goes blank then coming back on and off then stays blank. Also while it is actually working you can see the brightness fading in and out.

U have sound,after picture fated?Ur LCD inverter board it dead.must replaced this board to get the picture back.It usally a long board.Tries, for the board part.

Feb 06, 2010 | Samsung LN-T4042H 40 in. LCD HDTV

1 Answer

Samsung LN-T-4042H the picture is flashing. How

Look for screen setup for AUTO ASPECT in the setup menu, turn it OFF.

Nov 07, 2009 | Samsung LN-T4042H 40 in. LCD HDTV

1 Answer

When I try to turn on my Samsung LN-T4042H LCD HDTV it is now constantly clicking in a continuous loop and will not immediately turn on. It started out small- a few clicks yesterday morning. Today it...

There is a problem with the power supply in your TV. The regulator switch is causing teh clicking sound you hear. In order to fix it, you will need to replace the power supply. This is done by taking off the back cover of the TV, locating the power supply which is usually a yellow board that will have many high voltage capicators on it and replacing it with a new one.

Nov 06, 2009 | Samsung LN-T4042H 40 in. LCD HDTV

1 Answer

Samsung LN-T4042h to PS3 "Not Supported Mode"

i fixed it, on the PS3 u hold the power Button while holding then Switch the power button on on the back for like 10 sec and it resets the picture settings to default

Oct 24, 2009 | Samsung LN-T4042H 40 in. LCD HDTV

1 Answer


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.

Jan 27, 2009 | Samsung LN-T4042H 40 in. LCD HDTV

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