TG-16 with video memory problem

[jelloslug]

I have a Turbo that has a problem with the video memory. It had garbled graphics when I first got it and tapping on the left video ram chip made the graphics change. I reflowed the chip and the problem went away (or so I though). After playing the system for half a hour or so the garbled graphics slowly started to come back to the point that they were at when I first go the system. If I reflow the chip again the whole process starts over. Any thoughts?

[Keith Courage]

could be a bad chip but most likely it is a bad trace in between the two ram chips or a trace from one of the ram chips to the HU6270.