White dots appear on my screen - Samsung HL-S5086W 50" HDTV

That sounds like a common effect that plasma sets develpe ehen the voltage on the screen driver is set out of spec, or the plasma screen assy is going bad, 90% of the times that I have adjusted the voltage the sparkling effect came back, indicating that the plasma display is going bad. or the power supply is going bad, most of the time dried out or bad capacitors in the main power supply in the set. I wish I would have written down those capacitors values and their numbers., as I remembered I found the bad caps because the tops were swollen a little bit. not yet bad yetr but on thier way their. and if left unchecked they will blow up and causing a lot more damage to the power supply
Techman