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Yes,U have some basic machanicals skills?The Toshiba Tv convergence board,it call a Hyper board.Try website Ebay.com to buy a refurbish board.This board no longer produced by Toshiba,if can't find it.The Convergence 2 STK ICS,and some or all it resistors,must replaced manually.Must have tools,and knowing how to do basic soldering,to do this.
It sounds like your Convergence IC's have gone bad. This is a $300-$600 repair depending on where you live. I have recently changed them myself and it's not that hard if you have common sense and patience. If you do it yourself, you can do it for under $100.
The parts you need are 2 STK392-110 convergence amps and it's best to replace all 6 resistors that are related to the convergence amps as well.
Part numbers on the resistors are 24323129 and you can find then at http://www.vancebaldwin.com/products/?TBA&start=4501
You may have bad convergence chips in the set. I have worked on some with similar problems and replacing the convergence chips was the solution. Good luck and I hope this has helped.
Convergence amp ic bad http://home.earthlink.net/~oleg.filippov/ConvergenceFix.htm http://cmpalmer.blogspot.com/2006/11/fixing-my-own-tv-part-ii.html Sony Convergence http://www.techlore.com/blog/entry/19694/Sony-Convergence-Repair-My-Sony-TV-has-a-distorted-picture-/ http://www.techlore.com/article/19631/Sony-Convergence-Procedure/
so you missing the green is is either a bad connection on the green crt or convergence amp ic bad do this first http://www.riddledtv.com/repair/journal/Toshiba51H84/index.html then if that doesnt fix it http://cmpalmer.blogspot.com/2006/11/fixing-my-own-tv-part-ii.html
Get it fixed, because this is a simple repair. One of your convergence IC's has burned out and needs to be replaced. A good tech can fix the set in-house in about an hour and a half, and I charge $150 when I fix a set like that but shops in your area will vary so ask around. If you have a satellite receiver or a cable box, the changeover in 2009 should not affect you.