I have a ten year old PRO 710 HD set that had been going out for the past year. While watching, the pic and sound would go out. In the beginning, I could bump the set and it would come back on. Eventually, it would not respond. I got on line and found out that this series had poor solder joints on their power boards.

I pulled out the board and resoldered every joint. I am good to go now and saved a few grand by continuing use of a quality set. If you don't mind trying, some repairs are only intimidating until you try it.