Need diagnostic help on Hitachi 61UDX10B TV please

Hello, I own a Hitachi 61UDX10B TV it's 61 1080p HD TV. I've had the TV since 2002 that I bought from Sears and it's been very reliable. Unfortunately it recently went out on me. The TV turns on but it's slowly the screen gets smaller and smaller and turns off. I had the convergences kit replace back in 2007 so I don't think it's that. This is something different so I want to be able to find a problem and see what parts and service it needs. Hopefully they'll be somebody here they'll know about HD projection tvs.

Also why am I keeping this older tv? The reason is I like older things and this TV is very cinematic versus LED I don't like it all. So This TV has live with me for a long time and I just enjoy it. I have other TVs in the house but I just don't watch them so I want to try to fix this guy and keep it going.

I can take pictures of the TV screen and show you what it does. You can watch TV for maybe about a minute or two and then it shuts down.

Let me know if anybody would have an idea what this TV needs.

Thanks

Scott