Ok, since the lines move and are slowly increasing over the entire screen, it's most likely your E and F buffers are bad.
If they were stationary and non-moving, that would have been the plasma panel.
The part numbers are
E Buffer -- BN96-06762A
F Buffer -- BN96-06763A
Best price is here --
To replace these boards, there is a bunch of ribbon cable connectors that you have to flip the latch on, pull out the ribbon cable, insert into the new board SQUARELY, not tilted or partially inserted.
I usually start at one end of the new board and install one at a time, visually inspecting for square and fully inserted before I lock the flap down.
Then I screw the boards back in, and finish with the top ribbon cable.
Once that's done, I reconnect the boards so I can fire up the TV set and I look for one inch-2 inch bands on the screen to see if any of the ribbon connectors right below the black or snowy bands need readjustment/squaring up before reinstalling the back cover.
The menu is a good test and so is a DVD player since it's really portable.
Once the picture has been checked you can finish putting the back on.
Now, I have disassembly instruction for the model that came out just before yours did.
Most plasmas are built the same except for changes on the main board, like extra inputs and faster processors, so this picture will help get you where you need to be on your TV set --
If you have any questions taking apart your TV set, take a picture of the open cabinet and I'll walk you thru it.