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Re: White Dots (Plazma)
The symptom sounds like a common problem we have found with the plasma panels called diffusion.
The cure in Samsung usually is a VSCAN alignment.
Since its an SPS-4243 the unit should be under warranty and is covered. Call 1-800-SAMSUNG and they will direct you to the nearest service center.
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check ur cable connection first. if its also with dvd, the go for an extension box ( power strip) with. surge protection andemi filter.
if ur tv or any device comes with three pin connection ( three pin plug) then remove the ground from that socket also. i think white dot comes because of electrical interference. check all other power out lets for any loose contact.
then check again.
The only thing you can try is to adjust the tiny control on the Y board, if you want to try do this. Open the set , set it up so you can watch it with the back off. now looking at the back on the left side you will see a circuit board larger connected to a smalled one or two that go to the screen edge . on the larger board look for a few small controls, mark their positions with a dark sharpy then turn each a little while looking at the dots to see if one makes them better or worse. If one control effects the dots try to center it for the least amount of dots, if no effect is observed when a control is turned return it the original position that you mark before starting. if the dots do not clear either the Y board is bad or the whole scfreen is defective.