Arcade Monitor Repair - Basic Convergence Tutorial

[@ixamraxi]

The rings only adjust inner/static convergence (the middle area of the display) One set of rings (the middle set) adjusts both the horizontal and vertical component of red and blue. You adjust vertical convergence by moving both rings together, you adjust horizontal convergence by moving the rings independently, such that the tabs are closer or further apart. ( this can be tricky because there is also a rotational component involved due to the nature of the magnetic fields of the different ring sets interacting with each other as you move them ) The other set of rings (furthest back towards the neckboard) should not change the convergence of red and blue, but rather move both red and blue together/simultaneously, in order to line them up with green. If your rings do not behave in this manner (say your middle set controls vertical, and the rear set controls horizontal) the most likely cause is because the ring sets are not properly oriented with respect to each other. They need to be around 90 degrees out of phase in order for the magnetic fields of each ring set to do their intended function. Having them greater or less will cause the magnetic fields of each ring set to interact more than they should, which is what causes interactions like changing the rear rings affecting the function of the middle rings. Typically the way to avoid this is set one set of the rings to 10 o'clock (the rear set), and the other set to about 2 o'clock (the middle set), and then try to maintain that ~90 degree relationship between the sets, to keep their magnetic fields from interacting with each others function. The typical method for doing convergence is to turn off green, use the middle rings that converge red and blue until you get magenta/purple, then turn green back on and use the back set of rings in order to get the magenta/purple to line up with the green. With the static convergence done, its time do the dynamic convergence (the outer areas of the screen) This is the difficult bit, as it requires moving the yoke up/down and left/right. Tilting the yoke up and down controls the red/blue rotational convergence. Moving the yoke downwards rotates red counterclockwise while simultaneously rotating blue clockwise, moving upwards rotates red clockwise while simultaneously rotating blue counterclockwise. The goal is to get them to meet in the middle. Tilting the yoke left and right controls the size convergence. Moving the yoke left makes blue shrink while making red stretch, moving the yoke right makes red shrink while making blue stretch. The goal is, again, to get them to meet in the middle. What makes it difficult is getting both the rotational convergence and the size convergence to line up at the same time, because nearly all movements have both an x and y component, which means even small movements in one direction with have slight movements in the other axis, causing one to influence the other. After you do get this (without practice, prepare to spend a not-insignificant amount of time on this) you will probably still have a few areas that are imperfect. The remaining areas are the areas you tend to fix using convergence strips.

[@vagabondarcade7633]

Thanks, this is super helpful!

[@electronictreasure4191]

Thank you so much for this detailed description

[@RetroRefreshments]

I recieved the nastiest shock of my entire life (genuinely surprised it didnt kill me) from an arcade CRT when I was 16. Im 28 now and I got my hands on an original donkey kong and it needs some serious work. I think with your help in your videos im finally ready to work on a CRT again.

[@electronictreasure4191]

Thank you for this! I've been learning to repair CRTs and have about 10 successful repairs under my belt, but never dared adjust convergance only the yoke. The repair books I have dont even go into it. This took much of the fear away especially regarding the risk of shock there. Not as bad as I thought. I'll pull a junker CRT and experiment with the rings!

[@MikesArcadeMonitorRepair]

Great! Good luck.

[@davecarr7579]

Really enjoying the content of this channel. Thanks for what you do! 👍

[@oscaraxl]

Thank you planning to reslve my issue soon

[@retror.d.1630]

How do you get the lines to all sink in place at the same time? Every time I align one side the other I’m side goes out of wack. One side would be all white and the other looks like a rainbow.

[@TexasGamer915]

Thanks Mike for the tutorial!

[@Christopherh1234]

That looks really cool really dope

[@wooware]

Are there any dangers anywhere else besides where you pointed out and the flyback when messing with the tube and yoke?

[@MikesArcadeMonitorRepair]

Sure. Lots of places. Just don't touch anything that isn't plastic and you should be ok. Common sense will prevail most of the time.

[@krewkid82]

Very awesome!! Btw I got my mk1 chassis out of shutdown and the monitor is looking and working flawlessly!!

[@MikesArcadeMonitorRepair]

Nice job!

[@mohammadsherali]

My crt monitor problem red shadow back of text. So can I adjust the magnet ring like you do in vedio. I know that crt works above 25kv and I opened back cover of the monitor many times for cleaning purposes and I also adjusted focus voltage and screen voltage also. Please suggest me sir can do it myself?

[@kayanhashemi7419]

Thanks for the video, is there any special plastic tools you can use if you’re too nervous to do this adjustment with bare hands?

[@MikesArcadeMonitorRepair]

Yup… www.amazon.com/Aven-13016-Piece-Anti-Static-Alignment/dp/B07BSF97BQ

[@kayanhashemi7419]

@@MikesArcadeMonitorRepair Awesome thanks, 👍🏽 I hope I don’t have to do this anytime soon, but if I do at least I’m a lil more confident .

[@dime666bag]

Flippin awesome sir .

[@JOELY79]

cool video 👍any idea's why my ms pacman picture would be off to one side the pacman maze is over to the right more and not in the middle of the screen. could this be to do with the convergence as well ?

[@MikesArcadeMonitorRepair]

Not likely. Most likely just needs a vertical position adjustment.

[@JOELY79]

@@MikesArcadeMonitorRepair well done sir thanks a lot I'm new to this adjusting things and only just found the vertical position adjustments 🤣 now i can play ms pacman in the centre of my screen after years of never finding out how to change it thanks again 👍

[@JOELY79]

i now have another issue🤣 i adjust the pots on my machine to stretch the screen slightly it works great and looks better. the problem is when i come back the next day and turn it on its all out of sync again and shaking all over the place and i have to readjust them again . have you any idea why this would be i cant work it out 👍

[@MikesArcadeMonitorRepair]

Likely dirty pots or they need to be adjusted just slightly a bit more.

[@JOELY79]

@@MikesArcadeMonitorRepair yeah ill give them a clean. just strange it's ok until it's left off overnight i can switch it off and back on and its set in the position i put if but if left off overnight its all over the place

[@chrisshardwood2518]

Where can I buy the rings for adjustment my was dry rotted and broke that is all I missing

[@MikesArcadeMonitorRepair]

Unfortunately, there is no source I’m aware of other than possibly eBay.

[@MortalKombatArgentina]

Nice video!

[@davecarr7579]

Hey Mike, what do you think the best option is for replacing the white tape that comes on monitor necks? Doing monitor swaps and don't want to try to reuse the existing tape that is falling off. Amazing content on you channel. Thanks for what you do!

[@MikesArcadeMonitorRepair]

Medical tape is a good substitute as far as texture and likeness. Can’t speak for the heat aspect over time though.

[@3jane821]

Give gaffer's tape a try.

[@AlekseiCr]

Hola amigo, mi monitor hantarex mtc 9110 no tiene anillas solo una cinta amarilla pero esta muy pegada y no la puedo mover

[@MouMouhDS2]

My problème is I have perfect convergence in the middle but it’s off on top and bottom, what the solution, I also have static convergence ring

[@MikesArcadeMonitorRepair]

You’ll need to adjust the yoke or do a clean and balance procedure with a rejuvenator.

[@redfoxsis]

can you do a tube swap full tutorial for beginners

[@MikesArcadeMonitorRepair]

When the chance arises, I plan to.

[@redfoxsis]

thank you so much

[@FrancisJFox]

Can I send you a video of what my Pole Position monitor is doing & see if you can point me in a direction?

[@guybrushthreepwood3054]

My monitor has no rings and i definitely have a convergence problem😕 I don't understand it - it's a proper arcade tube and i read on some forums that some tubes simply don't have the rings (i forgot what was the quoted reasoning)

[@MikesArcadeMonitorRepair]

If the yoke is bonded on, the convergence is built into the yoke with internal magnets. There’s no way to adjust it that I’m aware of.

[@guybrushthreepwood3054]

@MikesArcadeMonitorRepair Thanks. It's strange, there's clearly space left for the magnet rings, but it's empty - the producer removed them. Maybe it's something to do with European screens, maybe they don't install them for some reason over here

[@DidoInFlames]

How to not get electrocuted ?

[@MikesArcadeMonitorRepair]

It’s only a matter of time.

[@cnhartwel]

Any suggestions if these were glued in place?

[@MikesArcadeMonitorRepair]

Use hot air to melt and remove the glue.

[@cnhartwel]

@@MikesArcadeMonitorRepair thank you, I will give it a shot

[@MK4Arcade]

I'm barely getting into arcade monitors and was wondering if the wells gardner k7000 requires an isolation transformer?

[@MikesArcadeMonitorRepair]

Yes. Do NOT run it without one. Most machines have one built into the power brick but newer games (MK4 for example) that came with a K7400 or Neotec did not since those monitors don’t require one. If you are ever unsure, just ask.

[@MK4Arcade]

@@MikesArcadeMonitorRepair Thanks Mike! I had ordered one just in case...I will be getting my k7000 and isolation transformer in today so I'll let you know if I have any questions.