Led 55 in 3d samsung 240 hz smart tv keeps freezing

SOURCE: TV shutting off randomly

it looks like a faulty mains board. you need to upgrade the tv software with the latest update. if the tv is not accepting the upgrade then it can be a crook mains board.
hope it helps! please rate my comments :D

SOURCE: 42" Samsung plasma keeps turning off

I have over 10 years experience in electronic tech support.

I know this isn't what you want to hear, but the problem you've described can't be fixed with troubleshooting. Your TV will have to be repaired. There is a part that has developed a defect and needs to be replaced. If you're still in warranty, the TV will be repaired at no charge to you. The warranty would likely be at least one year from the date of purchase from the manufacturer. If you purchased an extended service plan they will repair the TV at no charge as well.

If the TV is no longer in warranty, it will likely cost a minimum of $150 parts and labor. This is assuming that you only need a power supply module. If the problem is more than one of the circuit boards, the price of repair could go much higher.

I hope I've provided you useful assistance and that this information allows you to make an informed decision as to how to proceed from here. Please be sure to vote on my response. I hope I've earned a good rating from you today.

Please let me know if I can be of further assistance.

SOURCE: freezes turns white then turns off then back on

IF YOUR IMAGE IS ALL WHITE YOUR LOGIC BOARD IS DEFECT BUT IM SAD TO SAY DO NOT REPLACE THE LOGIC IT WILL ONLY TEMPORARLY SOLVE THE PROBLEM THE PANEL IS OVERLOADING THE LOGIC BOARD PANEL IS BAD

SOURCE: tv keeps shutting off and going back on by itself

Faulty parts on PS board , bad press for Samsung
When checking the capacitors, If they are slightly rounded on the top where the X is, the cap is defective.
Because the Samsung LNS4051D would not turn on and the power
LED would blink 4 times and the relay would click and this
would repeat again and again. I replaced power supply board
parts CM806, 811, 812 & 817, all 1000 uf 10v capacitors,
three had their tops bulged up slightly that I missed on
initial visual inspection. After seeing the reports of
problems with these caps on
http://www.fixya.com/support/t1336881-will_not_turn_or_off ,
I replaced them with Radio Shack part 272-1032, 1000 uf, 35v.
They are slightly bigger, but fit OK. TV is working fine now.
Cost was 4 x $1.59 = $6.36 plus the time. I saved between
$100 to 300 in the process of either replacing the board or
getting the unit serviced. If you are not comfortable
replacing components which means using a soldering iron, you
can replace the power circuit board, available from
www.Samsung.PartStore.com.
Some UTube showing the problem and fix
http://www.youtube.com/watch?v=tK7zFBBU6p4&feature=related
http://www.youtube.com/watch?v=Mm51C_RDIZE&feature=related
http://www.youtube.com/watch?v=BNHHrgX_6cs&NR=1

SOURCE: Samsung 4254 Plasma keeps shutting

I just picked up the same tv today I noticed after a couple min it shuts off and clicking same as yours. I took the cover off and it seemed to stay on longer but same thing. Then I tried running a small fan next to the power supply and It ran no problem for an hour straight you can try this without taking the cover off and aim it at the top air vent on the back cover. Runs flawlessly now. I am going to Look into stealing a fan out of another plasma I have laying around or ordering one that will match a voltage I can splice into off the power supply board preferably the smaller the voltage the better. It's a pretty crappy design for a samsung. I don't know if this will help you or not but good luck.