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AppleColor High Resolution Monitor Weird Distortion


Well-known member
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?


Well-known member
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.


Well-known member
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).


Well-known member
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.


Well-known member
Got some time this evening to finally open the monitor up and play with all the possible adjustment pots. None of them impact this weird distortion on the top row.


I have put red circles to show it. The sides are perfectly straight and the geometry pots for V.PIN, V.BOW, will impact the sides without touching those corners.

The rest of the monitor looks great, it's very sharp and convergence is good. At this point the only thing left to try is a recap. I'm going to take the whole thing apart and start auditing the caps in the coming weeks.


Well-known member
Finally got around to recapping the monitor. Lots of caps, but got it done and I'm happy to say the distortion is gone. Monitor works perfectly now. :)


Well-known member
Nicely done! Enjoy that Trinitron and know it won't go pop for another 25 years.


Well-known member
Finally got around to recapping the monitor. Lots of caps, but got it done and I'm happy to say the distortion is gone. Monitor works perfectly now. :)
Would you be kind enough to share a cap list?

Did you see any improvement other than to the distortion?


Well-known member
I didn't notice anything else outside of the corner distortion being fixed. But that's the only problem I had with the monitor. Everything else was fine.

I think the below is the list but note that I did the Apple 16" Monitor as well as this M1297 13" around the same time so I'm not positive. You should probably double check. I also don't remember if M0401 and M1297 were the separate revisions or whether even within the M1297 there were multiple revisions so another reason to double check with what you actually see on the boards. I'm copying these from my notepad so hopefully don't make a mistake in translation. Apologize for the lack of sorting on the cap numbers but I had jotted this down as I canvased the board so it's not in numerical order. The size is diameter first followed by height in millimeters.

  • Board B
    • C015 - 10uF 50V 85C 5x11
    • C013 - 2.2uF 160V 105C 8x12
    • C036 - 10uF 250V 85C 13x20
    • C025 - 10uF 50V 85C 5x11
    • C007 - 47uF 50V 85C 6x11
    • C023 - 2.2uF 160V 85C 8x12
    • C033 - 2.2uF 160V 85C 8x12
    • C035 - 10uF 50V 85C 5x11
    • C038 - 47uF 100V 85C 10x16
    • C008 - 47uF 50V 85C 6x11
    • C950 - 100uF 25V 85C 6x11
  • Board D
    • C547 - 1uF 160V 105C 8x14
    • C529 - 100uF 35V 105C 7x12
    • C524 - 470uF 35V 85C 10x20
    • C570 - 100uF 25V 85C 6x11
    • C592 - 100uF 16V 85C 6x12
    • C591 - 100uF 25V 85C 6x11
    • C572 - 100uF 16V 85C 6x12
    • C569 - 100uF 25V 85C 6x11
    • C568 - 470uF 35V 85C 10x20
    • C581 - 22uF 250V 85C 13x25
    • C575 - 33uF 160V 85C 16x25
    • C586 - 47uF 16V 85C 5x12
    • C587 - 47uF 16V 85C 5x12
    • C516 - 10uF 50V 85C 5x11
    • C526 - 4.7uF 50V 85C 5x11
    • C530 - 10uF 50V 85C 5x11
    • C519 - 22uF 25V 85C 5x11
    • C520 - 1uF 50V 85C 5x11
    • C523 - 1uF 50V 85C 5x11
    • C501 - 1uF 50V 85C 5x11
    • C531 - 470uF 16V 85C 10x12
    • C597 - 0.47uF 50V 85C 5x11 BIPOLAR
    • C511 - 3.3uF 50V 85C 5x11
    • C510 - 4.7uF 50V 85C 5x11
    • C505 - 1uF 50V 85C 5x11
    • C506 - 1uF 50V 85C 5x11
    • C512 - 4.7uF 50V 85C 6x11 BIPOLAR
    • C513 - 33uF 16V 85C 5x11
    • C517 - 2.2uF 50V 85C 5x10
    • C588 - 4.7uF 50V 85C 5x10
    • C595 - 2.2uF 50V 85C 5x10
    • C594 - 2.2uF 50V 85C 5x10
    • C599 - 4.7uF 50V 85C 5x10
    • C546 - 100uF 16V 85C 6x11
  • Power Supply Board
    • C107 - 470uF 400V 85C 35x41
    • C108 - 4.7uF 350V 105C 16x26
    • C109 - 4.7uF 350V 105C 16x26
    • C113 - 22uF 50V 85C 5x11
    • C216 - 4.7uF 50V 85C 5x11
    • C215 - 22uF 50V 85C 5x11
    • C209 - 47uF 25V 85C 5x11
    • C210 - 47uF 25V 85C 5x11
    • C205 - 33uF 160V 85C 13x20
    • C203 - 100uF 160V 85C 16x26
    • C206 - 22uF 100V 85C 8x11
    • C204 - 470uF 100V 85C 16x31
    • C218 - 100uF 25V 85C 6x11
    • C219 - 100uF 25V 85C 6x11

Again, you should double check these as you're pulling the old ones off the board just in case. But hope this helps.