Looks like they replaced an inverter transformer. That's unfortunate, because it's quite likely that's what is causing this issue.
Are you going to repair it yourself this time, or do you need a cost on repair?
I understand, and agree with you. I would replace the TV at this point, as well. Based on the symptoms you mentioned initially, there are a couple possible things going on inside the TV, but considering this model's history, the technician would probably end up replacing the inverters again, at the least. I've worked with this exact model a number of times, and honestly, you may have even been looking at more work, like a power supply or main board replacement and there's no way that would be cost effective considering the cost of replacing the TV. With two repairs already behind you, I wouldn't recommend going through it again.
If you decide to go shopping, take a look at Samsung's new LED line. They're pretty impressive, and you can get a lot for your money.
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