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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. -- Vasos Panagiotopoulos, Columbia'81+, Reagan, Mozart, Pindus blog: panix.com/~vjp2/ruminatn.htm - = - web: panix.com/~vjp2/vasos.htm facebook.com/vasjpan2 - linkedin.com/in/vasjpan02 - biostrategist.com ---{Nothing herein constitutes advice. Everything fully disclaimed.}--- |
CRT peel
On 6/11/2021 10:10 PM, wrote:
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. 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. https://www.youtube.com/watch?v=4zKnRoNc9Q0 |
CRT peel
On Sat, 12 Jun 2021 14:57:57 -0700, John Robertson
wrote: On 2021/06/11 7:10 p.m., wrote: 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. 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 :-#(# I worked on a TV production line for a few years. Nobody had protective clothing. Just occasionally a CRT would implode when it was lifted out of the delivery box. It was seen as a loss of production time rather than a potential injury. Steve -- http://www.npsnn.com |
CRT peel
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CRT peel
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CRT peel
On Friday, June 11, 2021 at 10:10:13 PM UTC-4, wrote:
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. -- The CRT is considered a single replaceable component. Removing the bonded safety glass is very dangerous and something no manufacturer would recommend. 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 and 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. |
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