Tv will not stay on

The fact that the television stays on for hours and other times turns in five minutes shows that your problem is intermitent .A defective component in the power supply is probaly causing the B plus voltage to go up.The TV can also have a dry joint which looks more likley i am curtain if you gave the TV a firm tap to the side when it come off it would come on back. Try it .

Thats a common symptom which is usually caused by the Small signal board. You can get a replacement small signal board from www.tvrepairworld.com

when i turn my 32 inch VIVIO plasma tv on it turns pff by itself. i want to know why this is happening

This problem is exactly the same with my tv, just remove the battery of the remote. if it stop on & off, then clean the remote

One must be very careful of the quality of the replacement lamp. Many of the cheap 'deals' on the web for replacement lamps are substandard. I always recommend that replacement bulbs be the original manufacturers bulb.

First, need to check the power bar(if you use).
then. if don't use power bar, need to check the power board.

The first place to start is to change the lamp.

same problem... tv turns on and off repeadly while the green light flashes. seems as if the tv keeps restarting. please help.