I'm sorry to hear that you're having this issue. While everyone, like the tech you spoke to, is entitled to their own opinion, it's likely that the set can be repaired. If you want to pursue that option, you can call 800-SAMSUNG to have a service tech assigned to inspect the unit.
My Plasma MODEL CODE: 4232X/XAA experienced intermittent black-out the right side of picture and finally remain black. After three week of electrical disengage, I connect and intermittent picture back and fort of the right side of picture and Alleluia)is a miracle its back again. But not to much time, in 3 minutes the right side go black again and remain black. I call to Samsung local service, they said if the plasma have more than 3 years its better replaced for a new one because is to expensive the repair of this unit. This unit cost about $2,400.00????????