Question about 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 indicate that it is on. Can you tell me what is causing this to happen?

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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 Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement.

Posted on May 11, 2010

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Our samsung dvb turns off for 5 secs and on by itself even with the sleep timer off. what is wrong with it?


Are we talking about a DVD unit alone or one built into a TV set, called a combo unit?

May 25, 2012 | Samsung LN-T4042H 40 in. LCD HDTV

1 Answer

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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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

Clicks on and off several times before staying on


The power supply will sense if the set is 'drawing' too much current and switch itself off. This could be the case here. The power supply board may eventually go completely bad.

Feb 23, 2009 | Samsung LN-T4042H 40 in. LCD HDTV

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