[Coco] F board video issues

[Josh Harper]

 I have 3 coco 1 F boards with video issues
2 of them show up with the normal boot screen  but the writing  is missing parts of the letters almost looks faded  example there is part of  a Y  or half a O and so on
the 3rd coco 1 will boot to a normal boot screen except  instead of green its redish
and some times it will just boot to a ok prompt only,,with the same redish screen
also I have a hjl keyboard that when u press ? it gives you a = ? instead theres a few other keys that do this,its all so using a keyboard adapter,, I tried a different keyboard and it worked fine
does anyone how I might fix these problems
thanks for ur help