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CRT Calibration Fixing Corner Convergence
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- Опубликовано: 28 май 2018
- Thanks for checking out Episode 2 of "Quick Talks." This episode covers convergence and calibration again, but for the corners specifically. Fix those wonky corners with ease. Please like, share, subscribe and keep an eye out for the next episode.
I need to do this on my Trinitron but honestly this kind of work seems scary. I don’t want to take the chance unless I got a guy with a defibrillator on the sidelines lol
Ground your arms or wear thick rubber gloves
Why you don;t use a mirror? Back in 90' and 80' when CRT was still a thing, TV repair workshops had a mirror on every bench to observe the screen while manipulating inside the device.
Great video. This helped me fix a tilt issue I had on a commodore 1084 monitor that has annoyed me for years! Thanks for sharing!
Damn... how can you walk normally when you have such big cojones in the middle?
I own a 2005 SONY Trinitron 29KV, and it has this convergence in the top left corner.
If... I can't fix that with the Service Menu... I guess I won't fix it.
Too coward to open that 50 Kilo monster, let alone sticking magnets to it while turned on.
Great video! When I have or find an old TV passed saving I salvage the strips, I recommend others do so as well.
I love learning about things like this, Steve you're a gold mine of info I can tell. Keep vids like this coming! Cheers
I would love to try this on my Sony 14"PVM. However even as an electrician, I'm just too damn frightened to open up a CRT monitor while running.
Itl shock you but it wont kill you
use your right arm
Believe me, it will burn more than shock you, it's not that bad
People like to talk about crts like they are some kind of death box but nobody talks about microwaves, one microwave transformer can easily kill you, my neighbor died trying to fix one
@@geovani60624 microwave for sure is death. heart attack. maintenance guy told me he was fixing a microwave and luckily the shock shot out of his elbow instead of through his chest.
It worked, thank you! The picture on my PVM looks much better.
Awesome. I'm glad to hear that.
From what I hear you can make convergent strips with just pieces of cardstock, double-sided tape and the rolls of cheap magnet that you can buy at the hardware store
The convergence on my beautiful new Sony KV-21X5U Trinitron has partially buggered convergence in the corners, but I was able to fix them mostly with the service menu. Except for the top left. I can’t quite make that perfect. But I’m a massive idiot and I’m too scared to take the back off and fix it.
Hey, I just got the same model. Is it complicated to adjust it in the service menu? Also, how do i acces it? Thanks for your help :)
@@slamdownwarfare No, it's surprisingly easy actually. Make sure you take a photo of current settings when going in there, in case you alter anything for the worse, and don't randomly play with stuff. With the TV off, press the i+ button, 5, volume up and the button above the 1 button. See page 20 - www.manualslib.com/products/Sony-Trinitron-Kv-21c5b-3529360.html (C5 and X5 are similar except for the speakers - manual is for both). The geometry section has what you need.
Note that you'll need to be showing a 50Hz picture at the time - if you're using a 60Hz signal (e.g. with the 240p Test Suite set to 240p mode, rather than 576i / 288p), some controls are locked out.
It's a good model. Last of the slightly curved, charcoal coloured Trintrons, so has a decent, modern service menu.
Just bought a 2008 Emerson CR202EM9 in 2020, and it’s had a minor warping issue in each corner since the day I got the TV
While I’m far too worried to mess with an opened CRT myself, it’s nice to know that convergence strips are something I can mention when I have a retro TV shop service technician look at it (in addition to having them observe unbalanced stretching on the left edge of the screen compared to the right, which as I’ve read apparently is a yoke misalignment)
I wonder if that's what's gong on with the corners of the 27' Trinitron that I recently saved from the curb... Because the picture otherwise looks pretty good.
Great videos, Steve! Liked and Subscribed.
Sorry, I’m confused. Am I able to reposition and tape down the plastic strips that are already in my current CRT or do I have to replace the strip entirely with ones from another CRT?
Hey Steve, I’ve been tinkering in a couple PVMs I have and I found that some magnets did a great job to clear up some corner purity issues, but for corner convergence 2 different sets of convergence strips I obtained do absolutely nothing. Is there a reason they would have no effect on the screen?
I am really confuse..... How to touch the tube while it turning on? I thought we need to turn off to discharge the tube before touching it. Can anyone advise? Thanks in advance
I didn't know you could touch that part while it was on, do you mainly have to avoid the wire from the flyback.
Yes, I just made 2 videos on safety in a CRT. There is one for High end monitors and one for Consumer sets. Please review those to get more information on safety. Thanks
Very helpful, I've just done my own arcade monitor build with a 19" tv tube and a Hantarex Chassis + yoke for my street fighter 2 machine, I've got the convergence rings spot on but one corner won't converg right luckily I had some strips on the old tube and only 1 strip fixed the corner issue, cheers.
Do think the magnets might hold the key to some 12 and 6 o'clock position bowing? My consumer crt looks good with colours, Just has a hint of a bow-tie look it. Looking forward to seeing your next Q&A video Steve for hints and tips. Thank you again for all your hard work on these videos, I'm learning so much from your channel. It's brilliant!!!
Did you fix it? I have a top bow only issue.
@@oswaldcobblebotNo sorry. I decided to live with it. I was advised that with little to no experience on something like this I would kill myself. So literally... live with it. 😉
I have another question: If the corner converge is even worse than that, can it be caused by a bad cap for example?
And is there another way to fix corner convergence than using magnets? I heard using magnets is kind of a hack.
I tried using (even a big magnet) on one of my CRTs, but couldn't pull out the corner far enough (I didn't however try shoving it under the yoke).
Please help me, I haven't been able to do anything for a month. I connect the Sony Trinitron KV-21T1R Sega Genesis RGB TV to my image is shifted to the left, I can enter the service menu, but no matter how I try, I can't use any buttons to center the image. Why can't I change the values? Help please
Is this the same on a consumer tv like the Sony Trinitron KV-14T1 I have which has the same kind of bend corners?
what are those wedge rubber pads for on the crt? i had to adjust one since it fell off. it made imy tv turn on then off immediately for awhile, I let my tv sit over night then next morning it works just fine.
Hello on my CRT TV the image is arched downwards, could I use a magnet or mangets to fix it and get it straighter? Thanks
I need to do this with my KV-27FS210 I found working
Do need to get new ports on the tv I think they are going bad also the RF connector is missing but I can still use the same video and some of the composite ports.
But definally needs to be serviced and cleaned out.
When i found it, it was at a apartment complex and nobody really knows why it was just sitting in the area only one person knew the police put it in the spot and nothing else I also had to lift it on a office chair and push it to my vehicle all by myself the thing is so heavy it took me like 20 minutes just to move it.
I didn't know if it worked or not until I brung it home and used a extension cord to see if it powered on.
I wish I had the balls to open up my crt. The lines on my crt in the corners are all crooked. It annoys me but not to the point that I wanna risk death or pooping myself.
Nice video Steve! I saw that you wore safety gloves in another video about convergence strips, now I can see that your not wearing them. Is it safe to adjust these convergence strips with the TV on, with no gloves?
Its safe. If you arent touching the wires around the yoke you will be fine
hi steve, i got some of those strips from a smashed tv monitor i found on the street trash. but looking at the video i really can't understand where does the magnetic part has to go, i see you moving the strip arround but the magnetic end of the strip has to go really deep towards the copper narrow area of the crt? or magnet can go anywhere in the black back area? whats the difference putting a magnet in the top black area and difference putting magnet in the bottom narrow area near the copper?
Hi, thank you very much for the video. So I have just to stick some tape on the back ?
I need to look into this on my Sony HDCRT. I cant seem to get the screen straight. Although all i have been using are like the ESPN ticker, different sports network scoreboards and stuff lol. Is there anything i can use for a grid on a 16:9 set? The 240p one probably wont help much.
Nicholas Cheney also looking for 16:9 convergence and geometry suite
Where i can find that calibration screen in service menu? I have a Sony KV-29FX30E.
I was just wondering the same thing, it would have been nice if he showed us
This is 240p test suite. You can get it for different consoles to display this screen. It is not a service menu option.
Are those strips and magnets on all trinitrons inside? I have consumer one a flat screen wega fd trinitron with a slight bit of that in the top left hand corner but no where else. Would I need to adjust it like that or with the focus pot as it's slightly out of focus aswell and bending down in the corner? Or is it a service menu fix? 🤔
Hey Guys, im new in the CRT Game and have a Sony Trinitron with one corner slightly off. I've checked the Tube and I have one strip in exact that corner.
Now the question, can i touch the tube wherever I want, when its on?
Hi, thanks for this information - I get an old TV CRT and have a similar issue but here a RGB line in the top, the problem? that old tapes in the top start to go off and the cinescope start to go down - I tape it again and perfect image.
This works also on jvc broadcast like tm 1750? I have also the right bottom falling down
Does it work on a JVC crt tv too? I found it from 4 months ago and I noticed the display looks curve and not straight so I was wondering if it can be fix or is it only just the sony trinitrons?
what about when images kinda puff during scene changes in games, like going from bright to dark.
Corner of my screen has discoloration due to the internal speaker. How do i shield it? It is a Mitsubishi, under the big casing i see what resemble bookshelf speakers hanging on the internal mounts. Tin foil?
Hi . I have a crt sony TRINITON with service mode . Can i fixed The convergence corner with service mode?
Will this work on a consumer grade KV model?
so this is what's up with the old CRTs, guess i should check that out on my odd geometry VGA CRTs
cdoublejj Most likely so. I've ordered a set of 10 new convergence strips. Once they arrive, i'll make a review video. They are being shipped to me from overseas though so it could be a few weeks till then.
if good is that something i can buy on ebay or amazon?
Here is a link to the ones I ordered. May not be delivered till end of June.
www.ebay.com/itm/CONVERGENCE-STRIP-Arcade-CRT/323285851728?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649
Not only do I have slight corner convergence, but both my CRTs don't show the full image, will this method work?
Yes it can help. You may want to see if there are any trim potentiometers that control your picture size inside your TV/CRT or in the service menu if you have a nicer monitor.
Retro Tech I have 2 flat screen CRTs probably made in early 2000s, one is a Panasonic, the other is a Sanyo. Would it be possible and safe to do the same procedure you did? I can't imagine tweaking the insides of a live CRT to be safe.
@@RetroTechUSAdo you know how to access a hidden service menu on an rca crt? Mine is from 2004. Nothing in the service menu about adjusting tilt or zoom.
hi, how do i get to that screen with the grid?
My 1995 Panasonic 27" has this same problem but I'm not willing to open it up, I'll just ignore
oo this is the video i was looking for nice
If I don't have those?
Wow this is the exact issue my 14m4u has. Thank you!
How did you get this pictures with square boxes?
Dude thanks man! Great vid!
Does the same corner concept apply to bottom corners?? My bottom right corner has this exact issue
Can this be done on any tv? my flatscreen Toshiba 27'' warps the image like hell and i need to fix it.
I have 2 27" crt and the picture on both of them bows inward about 2/3rd up on both sides why is this such a common problem? The tape they used in manufacturing just dries out? And then you have to risk electrocution to fix it, wow. Cool video just not sure if I want to test my luck and try it... is it worth the risk? hmm
My TV has the exact same problem.
So those magnetic tape things are safe to touch while the TV is on without me (hopefully) not getting electrocuted to death?
The exterior of the glass envelope _should_ be grounded, so it _should_ be safe to touch. But make sure the braided grounding strap stretched around the CRT is actually attached to the metal frame that surrounds the CRT face.
What if I don't have any
Been watching a load of your videos. Informative, well put together stuff. I don't know if you could help me however? I have a consumer CRT 21" Sony Trinitron from roughly the mid 90's. Desperately needs it's geometry adjusted. However, no matter how many different button combinations I try I simply can't access the service menu. Any help?
Hi, Thanks for watching and commenting. Unfortunately there isn't a service menu on the consumer sets from the 90's. Those have to be adjusted internally, if that's possible. What's the model of your TV?
Retro Tech KV-21LT1U. I also probably should have commented I'm in the U.K. Thanks for any help.
HI, I don't think there is a service menu for that TV. You will have to open the TV and see what's inside. Most likely it will need have the capacitors replaced to get the best picture. I just made a video about this today. Please check it out.
Retro Tech oh Christ! That's what I feared. Sadly I've no experience in this area and think I will find it impossible to find somebody local who still works doing such things. Seems an incredible waste. Still, thanks for all your help in this matter. Keep up the great videos.
with the tv off. On remote press in order Display-5-Vol^- power. that should open the service menu
Would be cool to see how you make those plastics
I think you can find those online
Where do you find these test parrerns?
How to picture tube charge
Is it only PVM that have these strips? Do consumer TVs have them?
Why is 2:29 linearity option not on my snes version of test suite??
so if you have this issue can't you just fix it thru service menu ? I have Sony kv-29x5e. I really appreciate a reply
Yes. I have the 21" version of your TV. The corner pin setting should sort you out.
Where do you get this grid to check the picture geometry?
It's called 240p test suite, it's available for many retro consoles.
My bvm has that ssme issue. Do they also have those strips inside?
How hard do you chase corner convergence? I've added strips to the back of one of my pvms and I'd say it's pretty good, but right in the corner I can see the blue bleeding slightly off the edge of the white. Is it worth chasing or is it impossible to achieve true perfection?
It's so hard to get perfection on the corners and with some CRT's it's just not possible. You can try to get your degauss cable/band tight around the corner and that can help with color changes.
Retro Tech thanks very much. I used some magnetic tape to get it is as good as it was going to get. I could either get it horizontally converged or vertically but not both. So I went for vertically, otherwise you can see colour bleed between scan lines.
I found a seller on eBay from France that seems to be selling convergence strips for arcade monitors!
Cool do you have a link?
rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F323285851728
Those look perfect. I'm going to try to order a set to test in a video. Could take a while to get delivered.
It’ll be worth the wait! I’m just not sure if they were handmade strips or nos from somewhere.
Juan Salazar i just ordered a set of 10!
Are these tapes used in consumer TVs too?
Dear Steve, I have an Sony Trinitron consumer CRT TV which has some issues with the convergence at the top of the picture. I would like to improve the convergence. Is it safe if I do it myself? Warm regards, Ronny Lehmann
Did you ever figure it out?
Would it be basically the same thing with a TV?
Hi
In my kv have eight ring
Two for purity and for for convergece on the yoke..
And more two behinde the yoke.
Do you know what is?
Will this work on consumer grade KV models?
yup
Where were you 4 years ago when I threw out my KV-34XBR960
i bought a Samsung tantus CRT "hdtv" and i was expecting to have great retro experience init.. wrong.. that thing looks horrible. Edges seems to have some kind og chromatic aberration, image is not clean, like a some noise in it.. disgusting.. I refuse to believe it is how it supouse to look, i guess i will have to take it to service.
How are you getting this grid to show up?
Using a test pattern generator or the 240p test suite. Easiest system to use it on is the Dreamcast, you can simply burn off a disc and load it right up.
Who else? Listen to this video and immediately looked around to see if somebody turned on a CRT? IYKYK
Where could i get convergence strips?
The person who sold these before no longer does so. I don't know of a retailer who sells these anymore. The easiest is to take them from another CRT.
@@RetroTechUSA why cant we just cut up a thin fridge magnet?
Did you find out where to buy those magnets?
Not on a consistent basis. Sorry
Hi! I recently purchased a crt tv sharp 76FW-54H TV for retro gaming, but unfortunately the screen is very disrupted and bowed on the side (inwards). Apparently, this TV never been serviced, so I believe there is a problem with focus and the geometry.
I tried to fix the geometry myself using the service menu, but changing values for: e-w width, pin phase, pin amp, upper and lower corner correction doesn't seems to do anything.
Here are the links to pictures:
i.imgur.com/CzL4Wo8.jpg
i.imgur.com/7BSfidM.jpg
i.imgur.com/mRlqYWf.jpg
To all the people complaining about being afraid to work on the TV; just wear protective gear!
Wait my magnets dont stick:p
They're usually taped down with back to back tape. The magnets aren't going to stick to glass. Make sure the glass part where the magnets will rest, is cleaned so the tape won't come loose from dust. :)
OMG.
This is the wrong test grid to use. You should be using one with white corners so that when you fix the geometry, you are not also throwing the corner convergence off. Of course, with your test grid, you won't know this until you actually play a game with it.
but don't you get shocked by touching these?
The top left corner of my crt is showing a separation of color. Like a shadow effect. Is that the same issue? How can I fix that?
same thing happen to me but at top right corner
@@id-iz2ds I figured out how to fix the convergence on the monitor. You need to rotate the convergence rings. Initially I thought I had to replace the convergence tape but that really did not do much. It's the rings that need to be reset.
@@vodkagobalsky ok i will try. thank you.
@@id-iz2ds Make sure you be careful when poking around your CRT. Read up on all the safety measures before you start.