Turns on and off on its own. No picture on

This is a common problem with all Samsung flat panels. The problem is caused by faulty capacitors on the Power board. It is an easy fix if you have basic soldering skills. You can also call Samsung and see if your tv is covered under the class action and they will send a tech out to replace the board.

Most likely the lines are coming from a failing LCD panel tab connection. The capacitor problem and LCD tab problem are the most common problem for older Samsung LCD's

This sounds similar to a known problem with bad capacitors in some Samsung TVs. Even though the TV is out of warranty, Samsung extend the repair period for affected TVs. Get your TV model and serial number off the back and then call Samsung at: 1-800-Samsung (1-800-726-7864).

Explain the problem and let them know that you have heard about similar problems and heard they were being repaired out of warranty. In my case, they sent a tech out and did the repair for free.

If for some reason they will not do it, the repair is quite simple for someone who can solder and you can find details here: http://www.thebuzzmedia.com/samsung-tv-capacitor-clicking-issue-and-free-repair/

Try unplug,replug tv back an hour later.The tv now, is resetting back to factory setting.The tv should work now,not than the power supply board is dead.That the board,where the power a/c cord plug into it.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish power supply board for the replacement.

if it takes like a 1 min then its ok

No need for manual or will find one because the tv corporation don't release them.Go to Shopjimmy.com,Ebay.com.Type in tv model Samsung LNT5265F power supply board and compair picture to ur tv power supply board.Ask questions to sellers.Buy it,and replace it.

you have one or two bad caps in the power supply board these can like devices will be puffed up on the top and the values are on the side replace it or them and your good to go

power supply needs replacing. most common problem for all samsungs.

sounds like a tv I had ,probably a bad power switch on the tv. its switching on and off w/ bad contacts.
Call for repair

I am having the exact same issue with an LG42LB5D... anyone have any thoughts?