horizontal stretched way too far on k7100

partypooper

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hi there. i just did a tube swap with my k7100 chassis that was completely recapped and has a new flyback. the old tube had a focus problem so i found another machine with a good tube and switched them out. they happened to be the exact same tube, same maker and model number so i didnt swap out the yoke. however after firing everything up, the new tube is stretched way too far and a lot of the game image cant be seen. everything else appears to be fine.

what would cause this? im completely baffled as to how a monitor with the same model tube could have two completely different results with the horizontal width. if i took the chassis off the new tube and put it back on the old one, the picture is fine albeit fuzzy because the tube is shot. the second i put it on the new one, it stretches out too far and adjusting the horizontal width coil only seems to have had a minimal impact. i could be wrong, but i dont think i should have needed to adjust that in the first place considering the other tube was just fine.

what could this be? ive never seen a problem like this before and have no idea where to start. would the b+ be different between the two cabs?
 
I don't know the logistics behind it, but I would just think that 2 totally different tubes = 2 totally different results.

even though they're the same model and all.

for the hell of it, maybe measure the resistances between the vertical and horizontal on the yokes, see if there's any monumental difference. probably isn't, but whatever.

I'm leaning towards maybe the yoke being bad on the new tube? I don't know, never messed with that yet. my next guess was gonna be the width coil, but you tried that.
 
Your problem lies in the yoke.

thank you guys for helping me. when you say the problem lies in the yoke, is it something i could just adjust on the yoke thats in there? or are you saying the only way to make it work is to swap it with the old one? id love to know the technicalities behind this because ive never heard of this problem before and there doesnt seem to be too much info about what causes it. again thanks for the replies, you guys are speedy :)
 
Well... the tube can be the same, but can have a different yoke on it. Measure the resistances of the yokes and you'll probably see they're not the same. If it's just slightly different, you may be able to adjust the width by replacing the width caps ( http://www.therealbobroberts.net/width.html ), though if it's way off, you'll need to swap yokes.

DogP
 
Well... the tube can be the same, but can have a different yoke on it. Measure the resistances of the yokes and you'll probably see they're not the same. If it's just slightly different, you may be able to adjust the width by replacing the width caps ( http://www.therealbobroberts.net/width.html ), though if it's way off, you'll need to swap yokes.

DogP

well while i dont know how to do it yet, i imagine the easiest thing to do would be to just swap the yokes. i dont know if its worth it to go through the trouble of replacing the caps when i could just pop the yoke off the old tube and put it on this one.

with that being said that brings me to my next question, how do you swap a yoke exactly? ive seen countless documents online that show what the tubes look like with them on and off, but nothing showing the actual process. is it just a matter of pulling the pieces off one by one? marking the convergence rings and such of course.
 
As mentioned already, I would measure the resistance of the yoke windings first just to see where you stand before yanking them off and getting into a reconvergence scenario.
 
well i just swapped the yoke and everything seems to have gone fine. i ran the risk of running into convergence issues and it didnt turn out too bad.

everything else i know how to fix (theres a slight rainbow effect going on but thats cake), the only problem i have is this here:

http://i39.tinypic.com/qxut78.png

the right corner about halfway up the screen is almost a brownish green that i dont think is something the convergence rings would fix and almost seems as if the main base of the yoke might not be on all the way. would this be a correct assessment? the image itself is slightly distorted in that area which makes me think degaussing wont fix it.

thanks in advance everyone
 
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