K7000 vertical collapse

[gt7766c]

Based on what I could read online this seems like my yoke went bad.  I took the chassis out and checked the usual (ic3, etc) and all seem ok. Vertical yoke wires read about 20ohms and drone aht I read/watched it wants to be around 10.  Any thoughts on what I should look for next to make sure it’s the yoke?  I have some donor commercial TVs in the garage but they’re 27” so I don’t think I could test the chassis on those, but maybe I’m wrong.

[gt7766c]

These are what lead me to believe it’s the yoke,
https://forums.arcade-museum.com/threads/k7000-partial-collapse-any-ideas.489240/
https://forums.arcade-museum.com/threads/k7000-vertical-collapse.533564/

I also watch a lot of Mike’s Arcade Monitor Repair

[FUNWIZ]

I’d suggest checking your deflection area for capacitors over 100V and replace them. 

[gt7766c]

I was doing some more research and came across this post:
https://forums.arcade-museum.com/threads/k7000-partial-vertical-collapse.226494/

Then inspected mine and found this:  I’m hoping this is the issue, that it just worked itself out over the years somehow. It’s pretty difficult to reinstall, tried and stopped, will try again another day and then test the chassis.

[FUNWIZ]

That is strange, I do have brand new sockets for all the different sizes and stuff. I also have resistor kits, IC kits, transistor kits, and capacitor kits. When I’m working on a game or a monitor and I pulled out 100uf 50V capacitor, I look through my capacitor kit and replace it with the same or larger and I also have testers/analyzers and checkers that can test the components coming out and going back in to make sure everything‘s good to go. I also check continuity from one side to the other on all the traces and make sure that they’re getting good conductivity and no bad solder joints. Lately with the micro electronic boards we have nowadays, it’s cheaper and easier just to toss them away and buy new ones than it is to fix them, but with the older ones at least you can put a soldering iron onto them and replace the larger components when needed. Glad you found the trouble.

[paul400]

That is classic yoke failure , swap in  a yoke and you will be back in business.

[gt7766c]

Ok, thank you all. I’m putting this project aside for now but will return to it.

[HammysHangout ( Hammy )]

yoke is def an issue, but so is that socket as buffet mentioned.

i would try fixing the socket or finding a better neck board and try it out, i show k7000 should be around ~13ohms, normally a yoke fails open or short, not an extra few ohms.