Purchased TV December 20, 2006 from WalMart for $1248.00. Watching the news three days ago and picture went blank w/no sound; clear skies, no storms or lightning. Green light in lower right below screen on. TV Repair shop said "Y-Sustain board bad; replaced with stock board, confirmed bad PDP panel(Plasma Panel) cost of repair will exceed cost of new unit."
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That usually indicates that the power section driver board (one of them) has failed on you.There are three boards each of which can fail and cause this. Usually it is the Y or Z board.
Bad news is to know which one you need to be able to test inside the tv. Good news is the boards are fairly cheap around $35. So you probably will have to take it to a repair shop to get it fixed. Unless they really try to do a number on you as far as prices it is worth fixing. However be a bit cautious here and get and estimate and find the price of a new tv. If the markup on the parts and the labor gets close to the new tv cost then you will need to decide if it is worth fxing or replacing. Ie used tv or new tv with warrenty.
I w having this same issue when watching a Blu-Ray disc. I found it to be dependent upon what picture mode the TV was set to. By this I mean certain picture modes would cause the TV to dim during dark scenes of a movie. Changing the picture mode helped a lot.
New products do fail. The set should certainly be under warranty. I would speak to the dealer you purchased the unit from and see what they suggest. Don't remove the rear cover, or do anything else to give anyone a reason to void your warranty. Most brands are 90 days on parts and labor.
Most likely what happened is one of the capacitors went bad. When a capacitors goes bad it produces a popping sound. This could be an easy and cheap fix if you find the bad capacitor or capacitors. The bad capacitor will have a bulging top most likely on the power board but could be anywhere.