Hello , my name is Jack Perhaps I can help you with this problem but first ;
What is the tv doing now if anything ?If you pull out the power cord for a minute is there a light or blinking light at the front , clicking sound from inside when you plug in the power cord or try to turn it on ?
Ok then your TV has a power board problem , how do you want to proceed from here ?Look into this yourself or the repair shop ?
Let me know with the tv`s model number and i will help you along if you wish to look into repairing this yourself ,otherwise i will give you the details and costs you could expect.
By the way , i will need the tv`s model number in any case if i`m to give you an idea of the costs
The model number will be fine for now thanks.
Perhaps would like to know if you intend to work on this yourself ?