On Mon, Jan 29, 2024 at 9:55 AM William Sudbrink via cctalk < [email protected]> wrote:
> There are several YT videos as you mentioned. Definitive is in the eye of > the beholder, I think. In hindsight, I would remind people to keep their > cool and carefully think through the safety procedures related to CRTs > before starting any work. I totally forgot to discharge my CRT but I got > away with it (I guess because it had not been powered on for four months). > An interesting side note is that the anode cap on the leaking CRT had gone > rock hard and there was a small "streak" on the back of the CRT that looked > like the plastic that it was made of had released some sort of oil. Maybe > it was attacked by something outgassing from the goo that the CRT was > dripping. Anyway, like Wile E Coyote, after I had shoved a screwdriver > under the uncooperative anode cap and finally gotten it off, I suddenly > thought "What the HE** did I just do???". > > Bill S. > I think you were fine. That's how you discharge them anyway. You were just missing the grounding wire :) Sellam -----Original Message----- > From: Bill Degnan via cctalk [mailto:[email protected]] > Sent: Monday, January 29, 2024 12:16 PM > To: General Discussion: On-Topic and Off-Topic Posts < > [email protected]> > Cc: Bill Degnan <[email protected]> > Subject: [cctalk] Re: ADM3a screen rot. > > Is there a definitive guide for repairing screen rot. One of mine needs > it. I have watched others but I have not attempted my own. I might try > this at the Kennett Classic workshop this upcoming Feb 17th Bill > > On Mon, Jan 29, 2024 at 11:41 AM William Sudbrink via cctalk < > [email protected]> wrote: > > > A quick note on ADM3a screen rot... my vintage collection resides in a > > cool > > (60-72 degrees F) dry basement. My "pride and joy" ADM3a (I have > > several) was just starting to show a few bubbles at the corners last > > September. I was pulling out some parts units on Friday and noticed > > that one had a much better screen than I remembered. Thinking that I > > might swap screens, I took a close look at "PnJ" and discovered to my > > horror that most of the lower half of the screen had "melted". "PnJ" > > was on a shelf, below eye level, nowhere near a vent or other source > > of heat. I was so annoyed that I immediately started cleaning/repair > > without taking any pictures (sorry). > > Fortunately, there does not appear to be any corrosion from the "goo". > > I completely desoldered and removed the keyboard assembly to get all > > of the crud out of (and out from under) it. The mainboard is a fully > > socketed example and the crud is down in several of the sockets. I'm > > still working on that. Anyway, the take away is don't assume (like I > > did) that the ruined ADM3as you see are the result of temperature > > extremes. It can happen anywhere. Keep a close eye on yours if you > > have one. > > > > > > > > Bill S. > > > > > > > > -- > > This email has been checked for viruses by Avast antivirus software. > > www.avast.com > > > > > -- > This email has been checked for viruses by Avast antivirus software. > www.avast.com >
