CRT peel

I bought an HP 2621a CRT computer terminal in 1980. But about fifteen years ago the screen got black spots like mildew. But it ain't mildew. Apparently the glue holding a plastic sheet over the glass is decaying. I looked online and found you have to peal that plastic off and remove the glue. I do have a Zerox (ok, it was Savin then) copy of the service manual, but it says nothing about this. Yeah, it's nostalgia and prolly not worth the effort. But would appreciate any tips from anyone who has done anything like this before.

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I have not done the process, however I do advise you wear protective clothing (heavy leather/armoured apron or jacket and gloves) and a full face shield that protects your eyes and neck when working with picture tubes. They can be very dangerous, in close quarters, if broken...

John :-#(#

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Reply to
John Robertson

Would that be anything like the CRT "cataracts" that tend to plague older CRTs? I've seen this type of issue clean back to post-war televisions, possibly earlier. I've seen some that look different from others.

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Reply to
Michael Trew

Of course the service manual does not mention this, it was either not known at the time it was made or the service was not intended to cover that long of a lifetime.

There will likely be other things wrong with it, like dried-out electolytic capacitors or other components that decay over such a long time. I would recommend consulting someone with experience in refurbishing such equipment, like "Curious Marc".

Reply to
Rob

I have a 45 year old CRT colour TV!

Reply to
Lucifer

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The CRT is considered a single replaceable component. Removing the bonded safety glass is very dangerous and something no manufacturer would recommen d. John Robertson's advice to wear armored clothing and eye protection is a good one if you want to attempt to remove the safety glass. I've used a heat gun and piano wire stretched between a couple of pieces of wood dowel to slice the glue to remove the cataract safety glass, but both the tube an d safety glass were indeed glass. If that's some sort of plastic on the HP , I don't know if the same procedure would work.

Reply to
ohger1s

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