I have a sanyo flatscreen tv that we've had for 3 yrs. Lastnight it was working fine when I got up this morning I turned it on and there was a blank screen and then it just turned itself off and it keeps doing this.
More aboutproblem sanya flatscreen
Need to bring it in for service, usually there are capacitor issues in the power supply or main board. Depending on how large and expensive the TV is, would be better to just replace it.