Unsolder the coil, if you can, but either way cover the coils
windings with hot glue. It will stop the high pitch squealing.
Dani.




Mark Fortune wrote:
Hi,

I have a computer monitor with a high pitched noise eminating from it
from time to time, which has been happening ever since the cat puked in
it a few years back. I believe it's one of the scan coils since I opened
it up the other day and noticed the copper wire was coming loose (ie
wasnt tightly wound any more). I cant quite understand how cat vom could
cause this since there's no residue on the coil itself - but perhaps it
caused a voltage spike that displaced the coil? I'm guessing on that
really and it's beside the point, the monitor worked after the vom dried
up and has been working fine since apart from that irritating noise and
flyback lines at the top of the screen from time to time - this might be
the timing capacitor but I need to go shopping for parts to fix that,
and oddly the lines are occuring less frequently since I fidled with the
coil last.

I am fairly certain that this is the cause of the noise as I did manage
to tighten it a bit by pulling it tight and re-soldering the end, but it
wasnt a complete fix. I am going to have a go at partly unwinding the
coil at the weekend and winding it back up which should do the trick,
but was thinking that applying some sort of adhesive would help it stay
in place. Other newsgroup users have suggested a silicone sealant, and I
noticed that I have some "hermetite instant gasket" left over from
repairing my car. I am wondering if this would be suitable as it does
describe itself as silicone rubber, but I thought i'd ask first to see
if anyone else might know if this was a good idea or not. If it is, one
final question... red or blue?