Amiga 3000, video issue

[koaftder]

Hey yall, i just recently put together an amiga 3000 system. I'm getting a wierd video problem. When the computer is started up cold, it looks like every horizontal line is shifted to the left a pixel or two, and it flickers real bad. After the machine has been up for about 10 minutes the problem slowly fades away. I'm currently using a descent VGA monitor, ive tested the machine on two monitors, and they both exhibit the same behavior, though they work perfectly fine on all my other machines.

Not much of a problem really, but i expect it will get worse. Any ideas?

-k

[Ilwrath]

I would guess (and this is just a guess) that something is mis-adjusted in the built-in scandoubler module.  Perhaps the timing is slightly off?  I think it has a potentiometer somewhere on the motherboard.  

I have a scandoubler card that exhibits a similar problem, only the inverse.  The horizontal lines start out a few pixels offset too far right, and then come into place as the card warms up.  After maybe a two or three minutes, it displays perfectly.  I always just figured if it got any worse, I'd mess with adjusting it, but so far, it's stayed the same.

[vic20owner]

Have you tried fine tuning the potentiometer in the hole near the scandoubler switch?

-tom