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Hi Bill, sorry to hear you're having trouble with the tv,
the thumping noise is coming from the speaker, correct?
Yes, I was not here when it started but my son said the picture went crazy then the nothing but the thumping sound.
Okay, from my experience with this problem, it is a faulty convergence board.
It is something that could be repaired, but it is hard to find many techs that still work on these older crt based sets;
if you think you're capable of fixing it yourself (comfortable opening up the tv and working on the internal parts),
you can remove the board, and send it out to be refurbished, then replace the board, there are services online that will do this for $100-150 (factoring in shipping)
If you're not comfortable doing it yourself, by the time you factor in labor costs, it is probably not a worthy investment for such an old tv, you'd be better off putting your money toward a new set.
I know, it was built in 2003 and I have replaced some parts twice. Very nice TV, particularly the sound. Any "ballpark" on what the part would cost?
You should be able to get it done under $150
OK, I may give this a try. Are you fairly certain this is the problem?
Yes I am quite confident.
If you'd like a 2nd opinion, try messaging the seller for the board repair I linked you to on ebay,
let me know all of the symptoms, and see if he agrees. The same shop repairs other boards as well (power supply, etc), so they have no incentive to repair the wrong part for you and end up with a bad rating of their service (same with me).
OK, thanks! trust your knowledge