LCD TV won't stay on when turned on. - Sylvania LC225SSX LCD TV

The reason for this type of faults are very difficult to detect. Contact any service technician.

Check and replace its main power regulator board. It might be faulty. Normally there is no repair to these boards. Card base replacement should be done.

when lcd tv`s fail to power up, but stay on standby. It is usually because of bad capacitors on the power board. My 22" lcd monitor did the same. It would not come off of standby. It starts with them being slow to turn on. "Sound familiar"? I fixed mine by changing the bad caps. There were two of them.

Quite possibly one of the heat sinks has come loose or a power supply cooling fan has failed.
Have you tried blowing it out using canned air?

power supply board caps or hv section of board.

bad transformer

Bad capacitors on power supply board they will be vented or swollen on Top. 1000uf 2200uf 10v 3300uf 10v

You have a power supply problem. Within about 32 seconds the picture drops out because the backlite transformers shutdown. Yoy will have to find a new power supply or have some one fix yours.

westinghouse flat screen ...blue light on lower part...can not get to stay on tv and no sound...what button so i push to go back to tv