TV turns it self off, after a few seconds of being on.

This television has had a problem with component failure. It turns on and then when it turn off it is going into protection mode to prevent further damage. The circuits in the television will go into this mode when they sense unusual voltage or current levels in the circuits. This television need to be tested for faulty component operation. The Customer support telephone number for Toshiba is 1-800-631-3811. Call them and give them the model number of your television and ask them where the nearest authorized service center is and for a telephone number. Give them a call and ask them how much they charge to estimate repairs for your model television. They should be able to help you. Then you can evaluate whether not it is worth repairing or replacing. I hope this information helps you with your problem.