AppleColor High Resolution Monitor Weird Distortion

[jmacz]

Finally found a DB15 cable (with all the pins) to test an M1297 AppleColor High Resolution Monitor with my Quadra 700. Everything looks good and the monitor seems to work.. but I've got this really strange distortion in the left corner.. it's like the top 3-5 rows of pixels are shifted to the left. It's not across the entire screen but maybe 40% of the width? But it's only the top 3-5 rows of pixels. I thought it might be the geometry (pin cushion distortion) but the rest of the left side of the screen is perfectly vertical and no issues in the bottom left corner either from what I can tell. Anyone have any idea what the issue might be?

Here's a picture:



You can see it on the File menu where it's black. The upper left corner has a tail because of it. Same when you click on the other menus including the Apple menu. But the menus on the right side of the screen are normal and not shifted.

Any ideas?

 

[Byrd]

It's definitely a geometry issue and requires some calibration; see if you can adjust (it will only be slight, and clean all the adjustment pots with electronic cleaning spray), however longer term to repair the shift is likely from failing caps much less CRT overuse.

 

[jmacz]

Thanks for the response. I guess I'll have to open it up as I believe the geometry pots on this monitor are inside (as opposed to the alignment adjustments which seem to be behind the little cover in the back of the monitor).

 

[Byrd]

Yes, on the inside once the cover is off. Hopefully an easy adjustment

 

[jmacz]

Ok, played with the internal geometry knobs and they don't help. Something else is going on, I assume caps. Oh well, I guess it'll be a project for sometime in the future.