The problem you are experiencing is not the panel itself, if it were the panel it wouldn't be "straight" lines, it would be all over the place.
Those "flat wires" are in cars, toasters, washing machines, TV, PS3, Xbox and everything else you've bought in the last 15 years. I have an old Kenwood "smash" rack (you know those shelf stereo systems) that is 4 pieces and uses an exterior flat wire to connect the four components together. That thing is at least 15 years old. I'm shocked the flat wire still works.
Anyway, not sure which flat wire the prior poster is talking about, but EVERYTHING in a TV is replaceable. That flat wire probably needs re-soldered to the board. Is it a "cheap fix"? Probably not. My guess is the wire is fine in the TV, just the solder has corroded over. Common problem in EVERY SINGLE FLAT PANEL TV EVER MADE. Even Pioneer Kuro's suffer from corroded flat wire connections.
I have one of the last Hitachi plasma made. It was in warranty when it started having an electrical bug. Mine was a color derivation that started 3 inches from the top of the TV, only affecting the top. It looked "white wash", so to speak. I was in the process of getting in touch with Hitachi for a warranty call on it. I just happened to be meeting with one of my installer contractors and he said his brother repairs TV's. He came over took three screws out of the back...spent 3 minutes and the problem was cured. He charged me $50. But I was lucky. These guys charge anywhere from $80-$150 JUST to show up.