Two vertical lines one at 1/3 screen the other at 2/3's of screen

I have a Toshiba Model 57H81, for the first 15 minutes or so of being on the picture is normal. After about 15 minutes two vertical lines (sometimes red, sometimes green) appear at 1/3 and 2/3's of the screens width. Shortly thereafter white horizontal lines appear but are confined between the divisions made by the vertical lines. Each third of the screen has white horizontal lines which confined within the 1/3 section they develop in and are isolated from the next third of the screen. Then ghosting starts, the ghost is above the original image. Since TV picture is normal when it first comes on it indicates that this is a heat related issue. I used a can of air to cool IC chips which removed the horizontal lines and ghosting. The chip that did the trick is the a 40 or 60 pin chip (unfortunately soldered in rather than in an IC plug)near the front of the left hand circuit board with a metal shield over it (looking at it from the front of the TV). I have not located the cause of the vertical lines yet. I have not been able to find a service manual with schematics on the television yet either. Any assistance would be greatly appreciated.