Fix it Friday - Adjusting Convergence Rings on a Cathode Ray Tube (CRT, Monitor, TV and Arcade)
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- Опубликовано: 8 фев 2025
- This video shows how to do a convergence on a Cathode Ray Tube (CRT) inside a television, monitor, or arcade monitor.
WARNING:
Working inside a CRT is very very dangerous. There are lethal voltages inside, and mechanism of shock is not always apparent.
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Real talk, thank you for actually taking the time to sync your camera with the refresh rate. Nobody else on RUclips seems to know how to do that and it drives me nuts.
Honestly, this is one of the best videos I've watched on the topic. Now I actually understand what's the relation of the rings in respect to moving them together or changing their spacing. Great demonstration!
Very helpful, thanks! I think he taught me more than he realized, namely 1. it is safe to put your bare hands close enough to the high voltage parts to spin the rings, 2. using a mirror or camera or something to watch the screen while you adjust. These are things he did not talk about, but, then again, no one else does either. I think repair guys leave out the basics because it never occurs to them that someone who doesn't know about convergence rings might also not know even more basic things.
It is safe to manipulate the rings with your bare hand but notice how I said hand and not hands - you probably only want to use one hand when you're back there, since if you accidentally touch a high voltage area and have both hands on the monitor/chassis...
Wow! this video was very very helpful! this was the most easy to understand convergence video i have seen and the only one i have seen that explains what each set of rings actually adjusts! im gonna go see if i can get my old 1985 Hitachi tv back into adjustment since none of the other videos i have seen point out that the front rings are for color purity and i think i got them way out of adjustment. Huge thumbs up!
+StarquestMan Thanks Starquest! Good luck!
Wow. This is the best video I've found so far that shows exactly what happens when moving those rings. GREAT!
Thanks.🔥❤🔥
This was a great video, thanks for the clear explanation. I am adjusting a 1985 Sony Trinitron with a Sony "Multi-RGB" input right now -- my biggest challenge is all the adjustment rings were glued into place and I had to use an xacto knife to separate them. Even now there is so much residual glue that it is very hard to move the rings independently. Still, I am getting a remarkably good pic for a consumer TV that was made when Back to the Future was in theaters.
I just recently tried this adjustment after watching this video with my 32 inch Sayno that the colors seemed off on…. It looks soo much better now… thank you. 🙏
2024 y estoy viéndolo con mucho asombro, gracias por este tremendo tutorial! Un abrazo desde Ecuador
That really helped. I have two Commodore 1702 on the bench actually and from some other videos i looked, having this double camera setup and to see live action and how you manipulate the flywheel directly by hand really get me confident to mess a little more into that while keeping my hands away of the high voltage. I'm always affraid that the insulation thickness of the cable / air gap isn't enough while i'm working in there... and some said that the yoke coils themselves were high voltage but i really doublt about it.
Holy crap, THANK YOU!
I threw out a commodore monitor with this exact problem!
Wonderful to understand what was the culprit now..
Very helpful! Excellent video! RUclips's algorithm is plainly dumb. I had been searching for a good video on the topic and this gem was here all the time.
Marvelous, thanks for this simple and effective demo!
Very cohesive, thanks!
You are god of tv.
Thank you.
How do you safely work on this while it's powered on? I'm horrified to do this stuff lol.
That's scary... touching stuff with your bare hands. I wish I was a little more knowledgeable so I could be less freaked out about opening up my CRT TVs... These videos are a good start I suppose. (Thanks!)
I thought exactly the same, as long as you don't touch anything metal it's perfectly safe, problem is that it's better said than done as I'm clumsy and I'm afraid my hand may slip and touch something it shouldn't.
@@God-yb2cg Exactly. Well... so far I don't have a huge need to open one up, but... there's just this nagging feeling that one or more of my CRTs could look noticeably better if I opened them up and calibrated them a bit. (One is a little soft in the corner and there might be slight "pixel crawl" going on, but nothing noticeable during gameplay.)
Great video, thanks for posting. That test pattern tool with the gun cutoff looks great, would you mind posting what the tool is called?
I guess this works the same way on consumer CRT TVs? Thanks for a great video!
Excellent thank you for this!
Thank you, this was helpful.
what are you using to get those blocks?
I have a Trinitron with the blue/red convergence slightly out. Have some nice test patterns in 240p test suite but I'm not keen on poking around the neck of the tube while it's on😂 Is it that risky as long as you stay away from the lopt and HT cable?
Fantastic video - thank you very much!👍
At 4:14 you bring your hand very close to the four connectors at the top of the yoke. I have been told those have high voltage running through them. Is that not correct?
I have a problem with my 1702 vertical position that just don't wan't to go high enough when turning the v-pos screw all the way. I looked at the schematics and that variable resistor is a 500 ohm in between two 470 ohm resistor that "sets" the workable range of that variable resistor. I tried to connect myself across one of the two resistor to add a temporary parallel variable resistor to see if lowering one of the two would allow me to get futrher in the vertical adj. range and sure enough, it does the trick. calculations done, i would need to swap a 470 resistor for a 120 ohm one. My only concern is the long term reliability of that fix as more current will have to go thru those resistor... I really don't know what kind of power they usually endure. The other way would be to increase the value of the other 470 resistance instead but to calculate its value, i would have to take it out, connect a variable one instead, set the v-pos pot to the middle position, set the temporary thing so the image would be vertically centered and then measure the thing resistance, find a proper match and weld that down into place.
The two monitors I have suffer from the same problem where the picture don't get quite high enough. Would it bother much the resistances if i lower the value of the string a bit?
Great video! thank you
Helpful video, I made a test screen, all you need to do is make image, jpg, png with red, green and blue tiles make it into a looping movie slide show and burn it to a dvd, hook your player up and press play that's how I do mine.
It is worth attending, sir is there any method by which i can measure beam current of colour monitor?
Very useful video. thank you. do you have a video on how to rotate yoke as my image is not quite straight. is it just a case of loosening the screw and carefully twist. is it OK to do while on if I wear rubber gloves?
Where gloves 🧤 and adjust the yoke left y right until the picture is straight
How are you feeding the test signal?
Should you really have both your hands in there like that without any protection?
The best video explaining the role of those famous rings. My question: I own an old Sony KV-29LS35B TV, everything is alright except that skin tones are not natural: there is always a kind of red/orange push (+ light purple or blueish lips). I have already tried everything in the service menu (change of RGB saturation values, change of Red and Green cut-off values but skin tones are still not natural). The other suggestion was to set the AXNT or AXPL values to 0 but there is no AXNT/AXPL to set off in my TV.
Could this "Red/orange push" (also visible on LG CRT Tv's) be a problem of purity or convergence ? Thanks in advance.
Color saturation might be too high.
Witch high voltage spots should I avoid touching ? thanks for any help!
All of them
i am too worried about those bare connection points beside your bare hand ! keep thinking is there any rubber gloves out there
The neck of the monitor , Which contains "The Electron guns" and the "Anode connector" , and the whole glass , I strongly recommend for you to use a "Screw driver" to control the "RGB" metal controllers , and don't touch more than them , and when disassembling the CRT, Make sure that it's disconnected from the Desktop's Tour and from the power cord
Hope that helps you.
@@insertx2k_dev The glass is perfectly fine to touch. Just avoid the deflection coil solder joints and obviously the anode cup and the back of the neck PCB.
I received a slight tickle when my thumb brushed solder joint (the solder had a bit of a protruding stalagmite) near the purity ring. It's quite a thrilling process.
where can I find the picture you are using to calibrate?
I just need basic instructions how to connect monitor to PBC board and haven't seen one yet disturbing
Great video. I think I have a convergence problem on a 1978 sony trinitron. I've had the set apart and set all the knobs to get the best possible picture but still in a game like super mario bros there's like a white shadow to the right of all the images on the screen. Thanks.
If it's a white shadow, it may not be a convergence problem. Any way we can see a pic? We'd love to help.
that sound like bleeding, maybe because you are using composite cables?? check the nesrgb mod
how to you turn off certain R, G and B? Is that disconnet the R,G, B cable to the chassis board?
I have the same question...
For real, man, what's the source of those colour patterns? They'd make this job infinitely simple
I use a dvd player that can play divx files from a usb drive and I encode manually some 720*480 avi files with the divx codec and some pattern i make myself. it's much easier to load anything i want on screen than using a signal generator, burning a dvd or anything else. Just ensure with some cropping tests, that your dvd player doesn't crop the output.
an old version of Photoshop, DIVX codec for windows, Lame ACM codec and VirtualDub 2 and you have mostly all the necessary tools to build your own patterns. I don't have a chessboard one like that but as he said, any convergence pattern will do fine. Just be sure if you shop on google image for a pattern that there is no anti aliasing in it due to some resizing. Every lines must be sharp. Also keep in mind if you make yourself some color pattern lines that YUV 4:2:0 (what's used by divx and youtube and so on) only allows for unique lines of "shades of gray" to exists, single lines of red green and blue, if not doubled by a width of 2 pixel wide occuring on multiples of two pixels starting from a corner just won't be sharp because of 4:2:0 chroma subsampling.
Many arcade games have a service menu and usually a color test just for that. if that's not an option, you can get a signal generator and wire it up to the crt.
Digital Video Essentials is a DVD you can buy to fix that problem
That DVD has like a lot of test patterns you can pause the video on the part that you want to fix. this DVD was recommended to me by JPs Vintage TV and Console Repairs on messenger
He also told me that in 80s TV sets is impossible to get a perfect convergence because there is no adjustable correctional electromagnets like in the later sets from the late 90s or early color TV sets using delta gun CRTs The convergence rings on the neck help set static convergence but dynamic at edges or corners
I have slight double image on text is very visible and i have a bit more flickering than normal. What to do with that flicker ? The tv is Panasonic Qintrix
First, purity. Second 4 pole, Third 6 pole. Is not it? Thanks.
Mr., I have a problem... On the left side of the screen, I can see the Red Phosphors above the other two. On the right side, I can see the blue Phosphors. It's like a X where red are above on the left of the screen, below on the right. The opposite for Blue Phosphor... This could fix the problem?
I have another CRT TV where the Red Phosphor is below but it's constant on all the screen.
What is the name of that machine you are using to fix the convergence?
Im sorry if i missed this part but how do you get the squares to appear? Is it an input you have to connect externally?
where do I get a dot tester to isolate the convergent and colors
what would you do if there is only a slight convergence and geometry problem in one of the corners (top left in my case).
This is literally my exact issue. Did you ever solve it? I have put over 30 hours into my 25" Wells Gardner K7400, even did a cap kit, and still same issue.
for convergence issues in the corners only, you use convergence strips to fix that. here is a video with an example of that: watch?v=NyGPws6Eu4Y
Yes...corner...convergence strip under the yoke.
can I use the the gave itself to adjust the rings?
Hi, I think I have the same problem with my crt, but it doesnt seem it's on the entire screen surface, do you have any suggestion for me? should I adjust convergence ring or should I look for another solution?
I just bought a tv and the lower left os out of sync but everywhere else it is pretty ok. Started watching this video and not sure it would help. Good to know a bit more about CRTs that I never knew before.
@@mrfoameruk I find out that the problem is'nt the convergence, if i can suggest you, search retro tech, thank to him I discovered that my problem is a geometry problem and it's easier to fix than I thought, you need only some kind of magnet, he suggest a product called "convergence strips" but it isn't so cheap, magnetic tape does the same job.
I apologize for my broken english, it isn't my first language, am I understandable?
@@metallitaITA I've started to watch his videos. I have a trintron and there are lots of adjustments you can make just using the service menu but a lot are vague so after I take a video of the current settings I will start to see what each one does.
@@metallitaITA I found the video I need for my problem. It does mean going in the back but the showing of it is well done if amatureish. search youtuber for "Sega Blast City Nanao / Toshiba ms2931 / 30 convergence fix adjustment"
Sorry for asking this question. For this convergence rings adjustment do we still need the discharge the tube? Thanks
The tv needs to be on for this adjustment, so no really can't discharge
would seeing very short red stripes coming off of characters in games be a convergence issue, its like certain colors stretch off of where they are supposed to be, if it is i guess i have more than just an overscan issue
That's in all likelihood capacitors not responding as well as they're supposed to and the signal getting corrupted as it reaches the display. Try lowering the brightness to the lowest possible setting and see if it persists. If it gets better, you probably need a recap.
Can you just do that with the picture? And how do you get that screen
Try watching the video.
How to adjust the vertical and horizontal alignment , my crt screen looks out of bounds
i think you can do that from the service menu . To acces you need to enter a code in the remote control
Great video! But could you tell me where to get the test pattern generator you use?
some boards have a test/service mode (its a button in the jamma pinout) and iniside sometimes its some kind of grid or pattern. this is in arcade monitors of coourse.
i have a 29 inch trinitron. it has a convergence and sharpness problem. do you think its safe for a novice to tackle? what are the dangers? what should i use to adjust the rings around the yoke? my hands? i really want to save the tv.
Get an LCD one , That really would be better for you!
is there a site where we can download the test patterns?
thanks for this great video!
some boards have a test/service mode (its a button in the jamma pinout) and iniside sometimes its some kind of grid or pattern. this is in arcade monitors of coourse.
@@inodororevi What about consumer CRT TVs? Where can I find the images to calibrate those?
@@redpheonix1000 using a.supernintendo or a psx to generate image... or a ps3 etc. "240p test suite' is available in various systems.
@@inodororevi I do have a PS1, but my only option with it is Composite video. I suppose I could try it.
@@redpheonix1000 Composite video is not a very good idea to calibrate convergence however! The easiest way, in my opinion, is to use a DVD-Player and play a Test Pattern DVD (you can find various free ones around the internet).
HI Create, great video !
I'm trying to do the convergence on my G07, is it normal to be able to set the center of the screen right but say the left and right be a touch off ?
Convergence strips .
Huh. I guess now I know where synth-trip pop band Purity Ring got their name...
Actually I think it was also the name for a ring Christian couples would get to vow they would remain virgins until they were married, and that's where the band took the name
@@WinstonDreadmore Well maybe, but it wouldn't surprise me if they wanted it to seem that way, and this was their true meaning. (You know, just to be a bit clever or unique.) I guess I could google interviews before I continue speculating heh. Happy Halloween.
Hi,if you could how do that with a nanao 2930 (with the 15/24/31 khz),my 15 khz is almost perfect (just a little red under ligne but not on the corners),my 31 khz...not good..too big..very strange convergence (better if I use the jamma 31 khz not vga strangely).
I hope to use all the resolution soon.
Thanks.
Well ,My monitor is 70KHz , 140Hz as a Maximum , It uses about 250V to work , but , I strongly recommend for you to buy a monitor which supports up to 1600 x 1200 @ 60 Hz ,If you want to get more Hz, You can improve it using CRU for Windows Desktops (Custom resolution Utility)
@@insertx2k_dev thanks...my picture is much better now..almost perfect (just a tiny tiny red and the picture bigger than screen in vga 640x480 p..so probably just the wide narrow or V liner on the platin).
@@Sam-Lawry Your welcome bro! ,but You can use 1280x1024 @ 60 Hz , It would be better ,because you won't see the pixels of the screen , Any CRT Supports that resolution! , I mean by saying "The pixels" That you won't see the Shadow mask 3 dots easily , Which really reduces Moire pattern and gives you a better viewing experience
@@insertx2k_dev Thanks...1280x1024 in 60 hertz on the Blast city nanao 2930/Toshiba..?
I like the old school 15 khz..but the 31 khz with the vga scanliner is very nice too..I m more pixel than scanlines lover..(scanlines remove a lot of pictures).
With the jammasd I dont have the 'switch' 15/24/31 khz..so can I use it in jamma 31 khz to check if the quality is better than vga directly.
And if you check my video test 2 31khz the picture is a little bit bigger than screen..so it's the wide narrow or other button to have a scale 1/1 screen and picture?
@@Sam-Lawry I don't know a lot about that game bro , but I can help you with the resolution,And my screen scans the vertical and horizontal lines together at the same time , and it's called as hp s7500 crt monitor which supports up to 1280x1024 @ 60 Hz (60fps Maximum) , And my monitor in 1280x1024 mode uses about 64KHz , and 60 Hz for vertical lines scanning , and I'll check your video test before I can reply you
Thanks for your honest reply.
Insert Playz
And how to adjust convergence on monitors without convergence rings?
If you are using a Desktop's CRT, You'll see something is called as "Moire pattern adjustment" , use it
My tv is a sony wega with up to 1080i capabilities, but a was attemting to move it but the screen tilted like 10 degrees, any help?
Move from place
Something might have tilted it's yoke..
hqdefault I think that's what pretty much what happned, is the fix any different from standard 480i crts just for the fact of being 1080i?
Yes, but be sure the yoke is loosen enough to do the slight rotation to where it was, also be careful when tighten it back, the yoke is held by thin glass on the tube and there is a vacuum inside. Also be sure there are not strong magnets rear sides of the TV (big speakers closer than 3 feet), those also cause some rotation of the picture.
hqdefault If I just take to an old school crt tv repair guy, do I tell him what you just told me or does already know?
is there a site where we can download the test patterns?
I have 6 rings on my old arcade monitor !
thanks for this great video!
Looks like the solution to my problem. Just a little worried to try messing with it, I heard these thing can straight up kill you if you get shocked by touching the wrong part.
@@_Thrackerzod amps are what you need to worry about.
@@lancecowburn1693 Volts are what allow the amps to flow easily. If the tube stores a charge at 30000 volts, it will discharge all it has stored at once, which means a lot of amps.
@@redpheonix1000 Voltage is not a measure of charge nor energy, so no, just because something can discharge at high voltage does not mean it will discharge many amps. And from what i hear CRT's do not store very much energy, and they dont produce many amps when turned on. If they did, the amount of power draw they would require would be MASSIVE.
From what i heard from people who have accidentaly touched the high voltage parts of the tube is it hurts and thats it.
how do you get test patterns and how to have them hook up? im having colour image distortion on 2 spots of my 1991 Magnavox perfect view
some boards have a test/service mode (its a button in the jamma pinout) and iniside sometimes its some kind of grid or pattern. this is in arcade monitors of coourse.
This is totally wrong, I’d suggest you read a service manual set up of purity and convergence. The purity is set in conjunction with the yoke positioning. There’s so many amateur people working in crt equipment that think they know what they are doing. Read the service manual set up and do it correctly. This is just a bodge until it’s nearly correct, another issue not mentioned is the set should be positioned east west during set up as to minimise the earth’s magnetic field influence!
He fixed it. I'm confused...
@@CozyCathodes its fixed as far as you can see in the video……… with purity you don’t set it like this. Check out a professional engineers manufacturers service manual.
Tv radio engineer for 35 years
I'll take your word for it. I'll be working on a Sony this weekend and make sure I'm east/west, honestly I like the by the book approach, but the sad part about this is there's not many real certified specialists out there to teach this technology.
You call that 4:30 aligned ? Please.