HV tracking across flexible PCB strips
jules.richardson99 at gmail.com
Mon May 11 13:20:36 CDT 2015
On 05/11/2015 01:01 PM, tony duell wrote:
>> Question is, once it's all thoroughly dry, what would be the most
>> appropriate way of re-sealing everything? Would silicone sealant perhaps do
>> the job (dispensing with the top layer of the sandwich entirely and just
>> coating the bottom layer/traces) and stand up to the HV OK? Or some form
>> of glue?
> Firslty, some silicone sealants cure by eliminating ethanoic (acetic) acid (they smell
> like vinegar) which is probably a very bad idea here.
Aha, glad you mentioned that - I know that the stuff that I have
immediately to hand has a vinegar-like smell.
> Secondly, HV finds a way to leak if it possibly can ;-)
> I would try to re-make the 'sandwich'.
Yes, I'd certainly like to look at that route first - mainly because I
think soldering new wires might be problematic. In response to your other
message, there's no way to attach any kind of heat shunt; the connections
at the CRT side protrude maybe 2mm at most. Perhaps heating the entire CRT
in a oven would be helpful if it comes to it.
> Do you have any idea as to the voltage involved?
No, but it's a small screen - 5" diagonal or so. I did find a service
manual for a 1330 display, which appears to be a very similar animal but
without the storage functionality, and that operates at ~ 3kV.
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