My television comes on and turn right back off,what's wrong with it

The set is is shutdown as something is wrong. The problem here is it can be power supply or another area in the set. Take it to a shop for an estimate.

Looks like a problem on the convergence board which requires repairing/replacing..

sounds like the flyback which can cause a either a sqiealing or a wispy hissing noise.

something wrong with the power board. it need to be changed.

I had the same problem, however we removed the back panel and right next the the outlet cord, you will find a small white tube, we just took it out and put it back in.

Check the solder connections on the flyback and also right next to the flyback there is a small white coil with copper wrapped around it that will sometimes arch causing the solder to need re-soldering

i have a sony wide screen projection tv KP-51WS500 Red stand by light on flashs no picture

I had the same problem with my 53wx53 and fixed it by replacing the convergence ICs, STK392-110, and a burnt resistor 2.2ohm 2w, total cost about $40.

A common problem with this model is the convergence IC's on the small signal module going bad and keeping the set from staying on due to protective shutdown circuits used. If that is your problem, the easiest fix would be to replace the module - Philips Part #313503710091, about $200 or so, or have a technican replace both IC's Stk392-120, Philips Part #932212344682 about $45.00 each plus labor and service charge of course. Other parts could be bad, but this is likely what I would try first.

High Voltage shutdown. Short in hv section or power supply