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It sounds like a filter cap is out or a resistor has gone o/c. check the circuit around the sub deflect board and anything that feeds it sometimes when convergence boards go they also take out a smaller component that is linked with the deflection. In this case the capacitors need to be tested or looked at for any signs of venting.
This is a convergence problem. It happens to all big screen rear projectors. The convergence output ic's need to be replaced. I would let a repair man do this.
Samsung parts for convergance problem http://www.partstore.com/Part/Samsung/Samsung/BP9500142E/New.aspx 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/
The Samsung has bad convergence IC's most likly. This should be repair ONLY by a trained technician as a TV set is not a place to experiment or tinker with because of the extremly high voltage inside. This repair should cost you in the range of 250 to 400 bucks . Good Luck
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