The TV which is a Sony model number KP-65WV600 is about 6 yrs old..
It now displays tripple vision (R/B/G) and looks as though totally out of focus or convergence.
I did try the both auto focus and convergence adjustment that basically produce no results.
What's gone wrong?
Does it mean the convergence circuitry has gone south and worth repairing?
If the unit is salvageable.
How much would it cost?
Does any one know any dependable TV repair shop in N. Dallas/Plano area?

This is pretty much the issue i have on my Akai every couple of years, and does sound like the convergence board.

I dont know about Sony but I was able to get a spare board throug teh Internet and fix it myself for little more than 100. It would probably need a decent set up afterwards to get the best out of it again so it may be worth getting a pro to do the whole job but obviously that will make it more expensive.

Typically, this is caused by failure of the convergence ICs. Those plus some possible circuit protectors are often a DIY project. Circuitry and parts types are similar among a lot of brands, so a search should turn up lots of pointers. A shop's service could run in the $175 - $200 range but might require additional charges for various things. ($175 - $400 totals have been seen) Taking it to a shop would probably keep it in the $200 range but 60"+ sets can be difficult to move.

Repeat failures are not common as long as you do a good job with mounting and heat sink compound. Most repeat failures are a result of poor attention to details. Many sets have yoke current limiting resistors that can change value and must be replaced or else the chips will fail again. Also many use a STK392-110 series IC that has several upgrades available.
http://www.hometheatershack.com/forums/manufacturers-service-support/5600-crt-based-rptv-convergence-repairs.html

The typical life of this type of set is in the 15, 16 year range. After that point, repairs may still be practical but unusual major failures would not be advisable anymore.

If this is an HD-Ready set (don't have manuals here at home) then check it in all display modes (Zoom, etc). It is possible to have some OK and some messed up. If this is the case than you have a different problem and solution. (a potential nuissance problem and not a component failure)