MKII Monitor voltage issue?

Mike Valmike

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Donor 2012, 2014
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Hi folks,

I recently rebuilt an MKII and this is what the monitor is doing (see photos). In places on the screen with no saturated white, the image is perfect. Have I got something hooked up wrong or set wrong?

Thanks in advance!

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To be continued...
 
Try adjusting the Horizontal Hold. Is this a K7000? Try adjusting the 50/60hz pot if it is.
 
Try adjusting the Horizontal Hold. Is this a K7000? Try adjusting the 50/60hz pot if it is.

Wells-Garner model no 25K7197 if that makes any difference.

The video ground is split into two wires, a black and a yellow, going to two separate ground inputs on the monitor chassis. Not sure whether that is relevant.

Tried maxing out the h-hold pot both ways, no change. Not sure where the 50/60 pot is? I am not seeing anything else except the two pots on the big gray box? I confess I am a bit of a n00b when it comes to monitors :)
 
looks like your vertical size is to large and you have some roll over. (adjusting the 50/60 pot should fix this as zeno mentioned)

when you rebuilt the machine did you rebuild the monitor too?

the gray box your referring to is the flyback i believe (on the far left), the 50/60 pot is to the right of it kinda in the middle i guess (here's a pic)

WG_25K7191_pot_zoom_out.JPG
 
OK got it, I partly solved it.

I had two grounds tied together to the video ground off the monitor. The yellow one appears to have been correct. The black one is terminated now. Doing this took care of the white banding distortion but not the top and bottom flagging.

The 50/60 pot fixed the bottom of the screen flagging. Now it's just the top of the screen. SO CLOSE!!!!

I am fiddling with the h-hold now... it seems like there might be one LITTLE TINY positon on it where it works. I keep going past it and introducing more flag. But I can get minimal flag at like one spot. Man, I really need to do the mirror thing you guys always do. :)
 
it could also be a vertical size issue, try adjusting that pot as well. (it should be to the right of the 50/60).
 
Make sure your sync wire is just plugged into the very last position. If you plug it into the horizontal, and the vertical on a K7000 sometimes it'll do this. If you've got two wires get rid of the one near the end, and only use the very last one.

The horizontal 'hold' and horizontal position pots also work in tandem. So you might have to move the screen over, and then adjust the horizontal hold to get it to lock in right.
 
yes check your synk wire.

it should be pinned like this.

1. red
2. green
3. blue
4. ground
5. empty
6. empty
7. key or blank space
8. ground same as pin 4 (optional)
9. empty
10. synk wire

Peace
Buffett
 
yes check your synk wire.

it should be pinned like this.

1. red
2. green
3. blue
4. ground
5. empty
6. empty
7. key or blank space
8. ground same as pin 4 (optional)
9. empty
10. synk wire

Peace
Buffett

Thank you, I will definitely check ASAP. I wasn't on location today so I couldn't give all this a shot. I am 99% sure I had the original problem with both grounds hooked up but it all cleared up when I did only the pin 4 ground, except the slight flagging. But I don't remember whether my sync is on pin 9 or 10. So I wonder if that's what is messed up.

You guys are awesome! Thanks for helping this noob out, my monitor experience is very little but I'm learning by doing.
 
Guys, that pinout thing solved it! I had been looking at a chart that showed (and agreed with the way the thing was wired up when I got it) that the ground was on the last pin and the sync was second to last. I wired up the sync to the last, terminated the ground on the monitor side (the ground down by the RGB is connected) and THE PICTURE IS PERFECT.

Oh my wow it looks so amazing.

Next step: finding a way to disentomb the sideart from underneath glops of paint. Then the photo gallery for here. Excited!!!

Thank you all once again!
 
Guys, that pinout thing solved it! I had been looking at a chart that showed (and agreed with the way the thing was wired up when I got it) that the ground was on the last pin and the sync was second to last. I wired up the sync to the last, terminated the ground on the monitor side (the ground down by the RGB is connected) and THE PICTURE IS PERFECT.

Oh my wow it looks so amazing.

Next step: finding a way to disentomb the sideart from underneath glops of paint. Then the photo gallery for here. Excited!!!

Thank you all once again!

sweet check out the my vid on your paint removal thread.
 
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