Hi, I have a 50 inch Panasonic Viera TC-P50G25 Plasma TV. It worked great the first four months. Around the 5th month, white little blinking sparkles were all over the screen, and of course, they could be easily made out on the dark or black colors. This was not constant and would occurr at random. Two months after the first signs, Panasonic sent out Digitial Services to fix it. They switched out something, what, I don't know, and said to call them if it continues. A few days later, the sparkles popped up and now there were blinking lines. I video recorded the problem and sent it to them via email because they were having a hard time believing me. Haven't heard from them since and I am now having audio problems. I'm calling them back this week, but I would like advice so I know what to tell them to look at or tell them to replace this,this, and this before my warranty expires. Thanks, Mike!

You are going in the right direction. Use that warranty to the MAX!

In a nutshell, the problem is probably related to the sets power supply.

I have answered quite a few plasma TV problems and most are centered around the power supply.
It takes a huge amount of current to "ignite" the plasma to get it to glow. Once it is lit, current is constantly fed by scanning through over a thousand "power" lines on one side of the screen and scanning over a thousand "address" lines on the other side. The sparkles and lines can be a secondary effect of its not being able to regulate voltages correctly.

The power supply in a plasma set has its work cut out for it and it is very important to make sure that it gets the ventilation you manual says it needs.... blocking the vents can quickly overheat a plasma set.

Some FYI stuff about plasma TV's....
1- due to their very nature, a plasma picture will dim over time. The materials that make up the power and address lines are slowly "sputtered" across the very thin gap between them and eventually darken the inside of the glass. This is slowed down some by coating the insides with a clear magnesium oxide film during manufacturing.
2- It is very easy to "burn" an image into a plasma TV screen, so avoid playing video games on it and don't let a "still" screen stay on more than a minute or so.
3- The screen itself is made of common "soda glass" - the same as window glass, and is usually 1/4" thick on each side (a little over 1/2" total) and this accounts for most of the sets weight. Between the two glass plates, there is a small gap that is made by fusing thin glass rods into the screen. In this gap is a vacuum, with a small amount of a rare gas mix added. Be careful not to hit the screen because if it cracks, vacuum integrity is compromised, the gas escapes, and your TV will be worthless.

Good Luck!

V.