mitsubishi vs50800

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cvts1
mitsubishi vs50800

I have a mitsubishi vs50800 rptv.  this weekend the picture all of a sudden turned successively red, greenm then blue, witha black curtain descending down the screen from above and below.  Then the screen went black.  The sound works as usual, but no picture now.   Can anyone tell me what the likely problem is and how to fix it.  An online search didnt help much.  Called a local company and was told it was a convergence problem which would cost me somewhere between 350-500$ to get fixed.  Is that estimate realistic? Should I get it fixed?

 

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