Cataracts repair gone wrong........ - Page 2 - Videokarma.org TV - Video

mr_fixer · #16 09-21-2008, 03:54 PM

I'm glad your Ok Doug, Picture tubes are replaceable you're not!

kx250rider · #17 09-21-2008, 04:23 PM

Glad you weren't hurt! I've had close calls, but never a full implosion in my face. I've seen tubes spontaneously implode in the middle of the night, so maybe yours had a weak spot or a tiny bubble in the glass next to the seal?

I've only done a couple of cataract jobs, and I need to do a 19EYP22 in a CTC-19 consolette soon. I have, in the past, done the job by sacrificing the safetly glass by smashing it from the edge, then carefully pulling it off piece by piece. Not recommended, though! I did that 25 years ago. When I did the HR21GVP22 (military 21FJP22) for my Zenith roundie a couple years ago, I used the heat gun method and it went fine, but the safety glass cracked. That was OK in that case, because I was replacing a 21FB with separate glass anyway. And I wore full motocross gear including helmet, chest protector & neck roll. I looked goofy, but would probably have been fine in an implosion.

Charles

3Guncolor · #18 09-21-2008, 04:52 PM

Doug I’m thankful you were not injured I’ve had close calls as well but nothing like that. I have always treated CRT’s like a bomb. And as we know they can turn into one. In my case I have used this type of procedure on several tubes during the last 20 years or so. But only on 21FJP22’s. I have always been worried about too much heat on one side of the tube. The last one I did I let it sit in the sun all day before I started working on the front. This may be the reason the Motorola tube failed. Charles I was dressed similar to you except I was wearing welding gear. In the tube plants this type of thing would happen all the time. Lets all learn from this and use it as a reminder that any work around a CRT can be dangerous. Anytime the back is off you are exposed to this danger.

sampson159 · #19 09-21-2008, 04:55 PM

glad you weren t hurt doug.i saw a crt implode after the band and ears removed. it was a magnavox crt in a sylvania gt matic.did the same thing and blew the cabinet apart.it was frightening to say the least! as the set was playing,(approx15-20 minutes)the cabinet started to swell up and finally boom!!!!!ny buddy frank never attempted such a stunt agaim and i never was near his house when he was doing tv repair!!!!again,i am sooo glad you werent hurt!

*zenithfan1* · #20 09-21-2008, 05:50 PM

Thank God you're ok! THAT was close. You could have been killed man! So much for the heat gun method, especially on an EGP. Shawn has a tube for you, he probably has already contacted you.

bgadow · #21 09-21-2008, 10:39 PM

There was somebody on here earlier this year who singled out the EGP and said they were weak and couldn't be trusted...I took what he said with a grain of salt. Maybe he knew what he was talking about after all!

I have done a number of tubes with the heat gun, and once I got the hang of it it worked very well. This is an important reminder to all of us about what can happen.

There were different variants of PVA, and not just the gray or green. I think there were at least a couple of the gray variety...or maybe I am just seeing them age differently. My tests showed that a Zenith (green) responds well to water but a green Motorola (a later 21" tube) was very slow to respond to it. I'd have to say that if I came across one of these tubes I would be VERY patient with it now.

Chad Hauris · #22 09-21-2008, 11:03 PM

That's so good you weren't hurt by the implosion. I was just fixing to try the heat gun technique on a 21FJP22, have never done it before but I will not chance it. What is the water method? just immerse the screen end in a bucket of water?

stereofanboy · #23 09-21-2008, 11:42 PM

I am so glad this thread isn't what I expected from the title. I was afraid I would read about someone being blinded by their eye surgeon! I never look to see what forum something is in, I just scan through the recent posts for something that looks interesting.

site123a · #24 09-22-2008, 12:30 AM

Damn your lucky you didn't get hurt, the best thing to do in this situation is to figure out what went wrong, then see what you can do differently next time.

You should definitely add this story to your web site...

firenzeprima · #25 09-22-2008, 01:07 AM

sorry gentlemen, I explained why the color TV SET Americans have double glass on kinescopes almost to form a tube? I think he saw only a sony kv 2000 with this type of double glazing. in color SET TV in Europe this double glass not exist.

bgadow · #26 09-22-2008, 11:52 AM

Quote:

Originally Posted by Chad Hauris

That's so good you weren't hurt by the implosion. I was just fixing to try the heat gun technique on a 21FJP22, have never done it before but I will not chance it. What is the water method? just immerse the screen end in a bucket of water?

There is a old thread that details it. Basically you peel off the "packing tape" and then put the crt face down in water-I went to Dollar General and bought an inflatable kiddie pool for a few bucks. It could take some time...a "green" Zenith broke down in about a week, as I recall, but an RCA-type hadn't responded after about 2 weeks. If you have the space and the time, though, eventually it will work. The proof is to look at a crt that has been outdoors for a long time.

old_tv_nut · #27 09-22-2008, 07:54 PM

Wow, Doug - glad you're OK - that's one of those things you'd rather see from a safe distance by closed-circuit. ("Bring in the remote control robot!") Hope you can find a replacement.

Tony V · #28 09-22-2008, 08:19 PM

Bryan,
So your saying the water method did work on the Zenith crt you were experimenting on? I remember your original post on it but didnt remember the outcome. I do remember that you said it didnt work well on the RCA tubes. If it did work on the Zenith, did the glass just fall off or did you still have to pop it off the crt?

Doug, i'm glad your ok and am glad you werent injured. Since i've had three crt's implode on me, i understand the situation completely. Two imploded by bringing them from a cold shed into a hot house in the middle of winter. The third imploded when i stupidly released the metal perma-band on an old b/w tube. I was young at the time and didnt know any better. One of the crt's imploded in my hands. Luckily, it only left me with two cuts to one hand, neither requiring stitches. Yes, i was extremely lucky. Today when i handle crts, i use leather gloves, goggles and a heavy coat.

The only thing i can think of that happened to Doug was that the Motorola must have had a weak spot in the glass envelope somewhere as he has did several of them with no problems, so it didnt happen because of lack of experience or technique. I believe the RCA type crt's can still be done safely with the heat gun method but all precautions need to be covered as far as safety ahead of time. Dougs mishap had to be a fluke with this particular crt as when he decribed this procedure in the past he took and stressed in great detail about the safety precautions that had to be taken to do this. I know there wasnt an error on his part.

Scotty at Hawkeye said that when he rebuilt these type crts in the past that the faceplates fell off when they were put into the oven. Obviously the heat gun shouldnt have generated as much heat as Scotty's ovens do, so i dont think the heat was the real problem. So it seems logical that there was a defect in the glass envelope somewhere. I guess the thing to concider here is use the faceplate removal as a last resort when a good replacement cant be found and then only when a good precentage of the bond has already separated. If the water removal procedure works on Zenith crt's then half of the tubes like this out there can be done that way, which leaves only the RCA's to use the heat treatment with. I have heard stories from former tv techs mentioning that these 23EGP22 crt's being unstable. I heard several examples where these crt's would implode by moving the tv from one location to another so it seems the quality control was lacking in the construction along with the crappy guns they put in these.
-Tony

NowhereMan 1966 · #29 09-22-2008, 09:11 PM

Glad you're OK, remember a picture tube is replaceable, you are not. That would be scary.

bgadow · #30 09-22-2008, 09:48 PM

Tony, yes, the Zenith responded nicely. I did have to pry a bit. I inserted popsicle sticks in the gap which helped it along. Once water started getting behind the glass it didn't take long. The green pva Motorola I tried didn't respond so fast and, sadly I grew impatient. After floating in the drink for over a week I started tinkering with it, prying on it...and I broke the safety glass. I had a devil of a time getting it off, still. The lesson is to give it plenty of time. Other solvents may work better than water but then you'd have to deal with having a tub of something nasty sitting there in your garage.