Dobson Statuary :
Really, I love this tv. So...how do I repair the dead power supply, sorry I know nothing about this stuff.
Well, you would probably have to call in someone, or at least somehow order the power supply for a 9 year old and replace it yourself. Again, don't mark my word 100% but very likely it is the power supply that has died. I know very little about TV internals compared to computer internals. And Pioneer did make great TVs, their plasmas especially, but I think they quit the TV business which could make things more troublesome.
Edit: Yes, I confirmed they no longer make televisions or any monitors for that manner