There have been offers to correct the white dot issue and a few folk would not accept the free repair because this offer only extended to a specific issue. It sounds to me that you declined this. I could be wrong and hope you accept the offer.
My HL67A510J1FXZA started getting the white dots probably after a year we purchased it (2009) but I did not pay much attention to it until now that it is unwatchable. I emailed Samsung already but they replied that if after troubleshooting it the problem was still there I would have to get it repaired on my own. It is a shame to have such a good size TV just occupying space in our living room or giving us headaches when on. Is there a (not expensive) part we can replace to fix the problem?