Flickering pixel problem

[kc]

My problem is with a TP 570, but I am hoping that someone with a 600 may have a suggestion.

I'm trying to extend the useful life of my well used TP 570. Often, after 10-20 minutes of use, pixels on the left side of the display will start to flicker. It's hard to describe -- sometimes it's clumps of pixels, sometimes lines, and sometimes whole areas with ghosting -- alternating between normal and purple/white -- typically on the left side of the LCD. My current current cure is a sharp whack to the LCD, which usually calms things down for a while.

About a year ago, when this started, I disassembled the TP and reseated all the LCD connections. Whether coincidence or not, it helped for a while.

I'd appreciate anyone with an idea better than whacking my LCD.

Thanks in advance.