Extreme screen "rot" on a TEC terminal

Paul Koning Paul_Koning at Dell.com
Thu Jul 17 10:50:54 CDT 2008


>>>>> "Bob" == Bob Rosenbloom <bobalan at sbcglobal.net> writes:

 Bob> On Thu, 17 Jul 2008, Mr Ian Primus wrote:
 >>> middle. It's referred to as "cataracts". I don't know if it's
 >>> mold, but it basically results in the breakdown of the PVA
 >>> bonding compound that holds the safety glass to the face of the
 >>> tube. To remove it, at least on the TV tubes, you take the the
 >>> tube out of the set, put it neck down in a large bucket/barrel so
 >>> that it's supported, and use a heat gun to heat up the
 >>> screen. After a while, the PVA will soften, and the faceplate can
 >>> be gently separated from the tube. Don't pry it up - try to
 >>> gently induce air bubbles under it with wooden shims and
 >>> heat. Once the bond breaks over most of the tube, the glass
 >>> should come off without breaking. Then you clean out all the PVA
 >>> gunk, and reattach the safety glass with packing tape along the
 >>> edges.
 Bob> This sounds like it might work. I just found an old TEC series
 Bob> 400 terminal that has a bad case of rot. I'll give the heat gun
 Bob> a try this weekend. 

Be sure to wear good quality protective gear (full face shield plus
safety glasses) in case the tube decides to blow up from thermal
stress.

	paul




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