D9200 Yoke Damage

Mongo

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I have a D9200 that was a gift from a member here at the last auction. I started looking at it last night to see if it could be saved. While re-assembling all of the connectors, I found the yoke was damaged. Not a little bit but a LOT. It rotates freely on the neck. It appears it got forced backwards somehow and shattered completely around the clamp. the two small fiber boards that have the connection points at the top and bottom of the yoke are hanging loose as they have been broken off of their mounts. Just the same... I shoved it all together and powered it up. Here is what needs to be repaired at this point:

The YOKE needs to be replaced or somehow repaired (lots of glue/epoxy and plastic).
The board powers up and I get neck glow for certain but I am not sure about HV yet.

Given my problems with the YOKE, is this worth bothering to repair or should I just junk the yoke and tube and save the chassis for another day?
 
Wells had a major problem with the yokes breaking on their own (due to heat). You could contact Wells to see if they still sell the yoke. Otherwise most people have used silicone glue to fix the yoke.
 
Pat, I have a good working D9200 here if you want to test your chassis.
 
Or if you do end up scrapping the thing I would love to get the monitor frame from you. Mine is mounted in a television case.
 
Well... there is no replacement yoke available. I will mess around with it a bit more but I may take you up on your offer to test. If I can't do anything with the yoke, the tube and frame assembly don't have any value to me.
 
I have a D9200 that was a gift from a member here at the last auction. I started looking at it last night to see if it could be saved. While re-assembling all of the connectors, I found the yoke was damaged. Not a little bit but a LOT. It rotates freely on the neck. It appears it got forced backwards somehow and shattered completely around the clamp. the two small fiber boards that have the connection points at the top and bottom of the yoke are hanging loose as they have been broken off of their mounts. Just the same... I shoved it all together and powered it up. Here is what needs to be repaired at this point:

The YOKE needs to be replaced or somehow repaired (lots of glue/epoxy and plastic).
The board powers up and I get neck glow for certain but I am not sure about HV yet.

Given my problems with the YOKE, is this worth bothering to repair or should I just junk the yoke and tube and save the chassis for another day?

the chassis is always worth fixing!
its common to me to see purity problems or image issue
because the yoke mounting rings damaged,and the yoke slips back
i say make what ever it takes to put it back up agaist the wedge spacers
confirm the purity looks good then make a funnel to position
the yoke,bring up the red raster test pattern
make sure the whole screen looks red evenly all over screen,then horiz and vertically is straight, at anytime you hold it straight
and test picture.. odds are the picture may look good if not
you may have a chassis problem need to fix chassis next or decide if your
going to do any repairs to chassis..wg has nothing for these models
all the yoke needs is repositioned and make the mounting ring.. don't touch the purity rings
its not why the yoke sliped back!
 
Yeah... that was going to be another part of this project... purity rings. I don't see any. Not sure if they are gone or have slipped inside the giant hole inside the back of the yoke...
 
It actually works? The last time I saw this, the tube broke under where the yoke was bonded to it, and when someone powered it up, lightning shot out and fried the chassis...
 
Yeah... that was going to be another part of this project... purity rings. I don't see any. Not sure if they are gone or have slipped inside the giant hole inside the back of the yoke...

no they fell off thats all
heres a picture of the yoke
ok this yoke doesnt use wedges its using adjustable spacers
you can get away with different purity rings. lay it down like in picture
hot glue the spacers cup to tube use another p/r and check picture.
just hot glue two for now,check the over all then fine tune everything.
 

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It actually works? The last time I saw this, the tube broke under where the yoke was bonded to it, and when someone powered it up, lightning shot out and fried the chassis...

I thought the tube might have vented but didn't see a crack and I got glow at the heater. Then I just plain stopped messing with it until I could investigate the yoke situation. Since I can't reasonably source a yoke and rings and tube, I am down to sharing what I do have with a couple other guys who need bits and pieces...
 
9200

With the tube faced down, just position the yoke were it is supposed to be and align all the plastic pieces that are cracked so they butt up to each other, secure so nothing moves and cover with liquid nails or something like that. Liquid nails is cheap and i wait a day just to make sure before moving. You might have to insert some rubber as a filler around neck to keep plastic together
I have done around 25 or so like yours. It is a pain sometimes but buying a new tube is out of the question. I also have a spare yoke if you want.
 
With the tube faced down, just position the yoke were it is supposed to be and align all the plastic pieces that are cracked so they butt up to each other, secure so nothing moves and cover with liquid nails or something like that. Liquid nails is cheap and i wait a day just to make sure before moving. You might have to insert some rubber as a filler around neck to keep plastic together
I have done around 25 or so like yours. It is a pain sometimes but buying a new tube is out of the question. I also have a spare yoke if you want.

Your Right!
But you and i might be wasting our time on this thread!
As mongo maybe just story telling about his monitor
Not looking for a actual fix.

I'm sure for the benefit of others on the site this thread
will be a asset to many who have this yoke problem because
of aging parts due to overheated related parts and see the symptoms.

In most case its up to the person working with the monitor to decide
if its worth their time and money to go further..
I only presented the confidence to go forward and make it happen.
I only offered a temporary fix to judge the whole repair to go further.


I'm sure if you want to present your experince in a actual repair
with visual demonstration on how your {#26 yoke repair} is done.
It will be very helpful to others..
 
It actually works? The last time I saw this, the tube broke under where the yoke was bonded to it, and when someone powered it up, lightning shot out and fried the chassis...

Can we verify that we are talking about the same monitor? This is a complete monitor (missing the purity rings) that I got from welove80s, I know he had a deal at some point with you for a DIFFERENT parts chassis but he said it never got completed.

I haven't torn this thing all down yet, I just wired it up correctly and applied power then shut it down. I am nowhere near electrical troubleshooting until I can finish working out the physical problems (Yoke Damage, missing purity/convergence rings, video/input card, possibility of a cracked tube).

Ohmerone, I am not necessarily "story telling" but instead gauging the level of difficulty of sourcing parts for this repair before I completely commit to it. If this thread ended with "Yokes are impossible to get and there is no way to repair the one you have." then it would simply stand as a warning to others who have this monitor and have Yoke problems who are searching for a solution. If it turns out there are some of these yokes/rings/video cards floating around and are reasonable to acquire (as it currently appears), then this turns into a full blown repair thread. The lack of enthusiasm you detect may be due to the fact that I am in no immediate or foreseeable need of this monitor. I would love to have it for my test bench or a spare if someone needs one in a hurry here locally but my level urgency (not dedication) in getting this repaired is pretty low.

Where I sit now: The Yoke appears to be repairable with some ingenuity. I could build that video card from scratch so repairing it isn't a big deal. The missing rings.... that bothers me. Finding them shouldn't be a huge problem but getting them converged is not historically one of my strongest points. I guess it may be time to improve my skills in that department.

I have one more monitor that was "gifted" to me that I have no history on but that has none of the physical problems I see with this one. Don't be surprised if this thread dies for a while until I get the other monitor working since it seems to be an easier fix. After all.... with the amount of glue I will need to use on that Yoke... it's going to take about a week to dry!
 
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If you need any rings, let me know. I've got (literally) ten times what's pictured.

Edward
 

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But do you know which ones are the correct ones?

Purity/convergence rings are pretty universal.....as long as you've got the proper diameter.

I've got a D9200 in the shop at present. I'll check it's rings with my box of extras.......and see if I have one that's the same manufacturer/size.

Edward
 
Thanks! Maybe I will hold of on moving the other monitor to the bench and concentrate on this one for a bit after all!
 
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