CRT Cataracts: Identification, Removal and Repair
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- Опубліковано 30 чер 2016
- A problem that has more recently been plaguing television and vintage computer collectors for at least a decade.
In this video we identify the presence of cataracts, prepare the tube for treatment, remove the safety glass and the decaying PVA compound and reinstall the safety glass. - Наука та технологія
I see someone else watches shango066. This is some dangerous work.
I diddnt understand why Shango wears riot gear until I witnessed a 24incher pop while fixing a cateract. Six inch shards flew 50 feet away.
What exactly caused it to implode?
the only video in all of youtube that explains about this problem, thanks.
You're supposed to use a minimum of double sided tape and instead shoot bathtub silicone (the acetic acid kind) and run a bead of it all the way around the outside between the glass and the CRT. It provides way more mechanical stability and sealing than doing it this way. I recommend watching UA-cam user Shango066 and his videos on removing CRT cataracts.
Excellent. I feel more confident to try this on my Wang 2200 PCS-II monitor.
I guess the jelly stuff between the CRT and the safety glass is part of the safety itself, just like in laminated safety glass. Not having the CRT and glass glued together with the jelly seems like a safety flaw to me.
It is PVA
I've never seen this problem before. Glad to be aware of it now. I'm mostly collecting CRT TVs, and the tubes in those are relatively problem free.
Really enjoyed your video. I’ll be checking out the other videos on your channel. Thanks
Nice job, that looks awesome.
The "bump" at 8:52 is the remains of the injection port where the liquid PVA was injected between the tube and faceplate during manufacture.
I had a feeling it was something like that. Halfway through the heatgunning it occurred to me it was more than likely the injection point.
Very informative, thank you
wow !! Very Informative Thank you for the insights
great vid doing my little 9 inch monochrome now
had to use silicone on my screen as the copper band protruded so much it was very hard to get the sticky pads on which didn't stick as well , looks good through !
awesome dude thank you
Is this removal method still somewhat applicable to more modern CRTs? You said the bonding agent was changes, is the new bonding agent more heat resistant?
I ask because I need the safety glass from a CRT for a project, I'm turning an old TV into an all-in-one computer, I'd like a modern LCD panel in it, but the screen of the TV is curved, the LCD is not, having a curved glass window in front of the LCD panel would somewhat help with the discrepancy.
Suuuuuuuper relaxing video, great job my man!
If the screen of a CRT monitor looks like you are looking a thin layer of water is that a Cataract or a different problem in itself?
couldnt you just use jb weld red gasket sealer? iv used it on cpu and its a terrific resealer and i havnt had issues deliding and reliding with it
How come we can't use the water soaking method on Zenith tubes? Will it damage it?
Good video. I never knew about this before. But given the small chance that something big and bad could happen if you were to knock the CRT by accident or have the glass develop a stress crack, i think you NEED to emphasize safety comes first. In particular gloves and glasses. You could be doing everything right and still the CRT could crack and implode violently. Why risk your safety for a tube?
The point of the safety lens is bonding it to the tube all over its surface.
47:50 Also, these days they preferred to be called "African-Americans" rather than colored people.
Tell me if you get a chip in the glass should you vent and discard the tube or could you use a windsheild repair kit to reduce the chips?
If it's in the safety glass, that's fine. If it's in the CRT I would hazard to evaluate in a per-tube basis because depending on the size of the tube or where the chip is located. I have buffed scuffed tubes but it's a lot of work.
@@CelGenStudios this one doesn't appear to have safety glass but ill have to double check however the chips look like pellet bullet marks but it wasn't like it before and i suspect my neighbor of doing it
Does the safety glass' being adhered to the tube, with the factory adhesive, offer any structural support as far as keeping the display from imploding? Is anything compromised by removing that layer and simply adhering the safety glass with the double-sided tape? This is a genuine curiosity of mine because I may want to perform this on a CRT that has a tiny cataract. I'm just trying to determine whether or not it's worthwhile.
The adhesive that bonds it on, no. The glass, yes as it's a sacrificial piece of glass to catch as much pf the debris as it tries to splash back and out the front of the display, or at least absorb the ejection force of the larger pieces.
@@CelGenStudios I've read that the adhesive is part of the barrier. I'm still undecided on whether or not I want to treat a monitor with a single spot of cataracts on it.
@@icantgivecredit871 If you don't mind it on the edges of the tube and the adhesive is not yet liquefying I'd leave it alone for now.
@@CelGenStudiosThat's the plan. It's a huge shame about the tube, but at least it's outside of the viewable area.
wow
CelGenStudios, I have a question. My CRT has this bluish tint that recently started to appear. I assume it might be a dry solder point or maybe (god have mercy) the gun is going bad. Any idea on how to identify the problem and repair my CRT?
Without being there in person to look at it the best I can recommend is asking over on the Videokarma forums.
I registered on the site, but when I try to post it kicks me off the site. I'm guessing I have to wait for admin to approve me? Anyways, I had my CRT into an HDMI to VGA adapter, but once I removed it and plugged my CRT into my laptop VGA for testing, It worked fine. I got a different adapter (DVI-I to VGA) and plugged my monitor back into my tower. Worked fine for about 24 hours and then I started to see the blue scan-lines reappear. Which I think means its either:
1. My graphics card (GTX 980 FTW) might be having some trouble adapting to the monitor's frequency in someway?
2. (I pray this isn't it) There might be something wrong with the CRT after all. (Even after all the work with retr0bright and cleaning I did to restore it).
Any thoughts?
Yes, due to spam issues when you register you have to wait for a moderator to approve you before you can post.
It could possibly be a bad connection in the VGA cable. Again, I'm awful doing long distance troubleshooting.
CelGenStudios If you'd like, I can send photos or video of the problem via email.
Nice tutorial! I had the same problem with my superbrain. I just felt not too comfortable with pointing a heatgun at a CRT. However, I managed to get the glass off without heating. I just used blades and lots of syringes filled with acetone. There is also a method to put the CRT face down in water for a month or so. I will try this one next time.
I'm surprised that has not happen to my GE portable color TV that was manufactured in June of 1980.
Seth Horst they stopped using PVA in the early 70’s
@@newvistacolor9463What did they begin using thereafter? A 1990's tube of mine has a small cataract that I badly want to fix.
May I suggest safety goggles and non slip safety gloves ?
Absolutely. I consider the process relatively safe hence the lack of any safety gear and walking around in flip-flops but each to their own.
Does this happen on later tvs like ones from the early 2000s
I have not seen it happen with newer tubes. This could be either they changed the adhesive or it's still to early.
I belive they changed adhesive to optically pure epoxy. Add a drip to the middle and push down. Hence, no sign of the injection bump.
great video, now show us the result :-D
Not bad, up until the last part. Foam pads to secure the glass? Why not put it back to almost-like-new and use UV LOCA adhesive? It'd be a perfect, better than original bond, and no chance of crap getting between the glass surfaces.....
The foam gives you a liiitle bit of wiggle room if you screw up, plus the added gap to factor in the missing PVA.
Maybe wear safety gear and goggles? And gloves when using Acetone.
Anyone watching this video thinking of doing it exactly the way this guy does it please do not he is doing it wrong. He’s applying way too much heat way too fast and the risk of it Imploding right in your face is very good also no he’s not wearing any gloves or mask. You should wear a face shield and not have any exposed skin anywhere near this operation. Including CRTs will smash you right in the face with tons of very heavy very sharp glass. So if that idea thrills you go ahead and follow the instructions in this video.
I see you missed the parts where I mentioned that proper safety equipment should be worn, be careful of thermal shocking and well, there is no need to rush the process. Likewise this is not a new process and is based of other people's work. IF you think you can do it better, please make a video doing so.
I hope you didn't scratch the main crt face at my point.
All that time and effort wasted if you did
1st...discharge caps :)
that's a big iphone screen