Are you sure it's 6 slow...3 fast?
Does your plasma panel at least light up ?
Screen doesn't light up....
Well, unfortuanately I don't have GREAT NEWS --
If you're getting 63 it may not be worth fixing it due to the cost of the panel.
What can $700 get you ??
Quite a few choices for that amount.
Unfortunately, it's not Great news....but at least you didn't hire a TV tech to come to your home and tell you the same news, and charge you a $50 trip/diagnostic fee.
And can you imagine the cost on a Weekend....