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Monitor High Pitch Whistle
- 05-02-2005
May 2, 2005, 1:32 pm

A friends monitor is occasionally emitting a pretty uncomfortable high
pitched whistle.
You can give it a knock and it may drop the intensity a bit, but will
often come back again later. Changing the display width also may reduce
it for a while but he says it is still there.
I assume it is a physical problem yes / no ?
Any ideas on solutions?
TIA,
Bryan

Re: Monitor High Pitch Whistle

The likely culprit is either the LOPT on the circuit board, or the scan
assembly on the neck of the tube. Some people have had luck using superglue
dotted anywhere they can see a join where ferrite pieces are clamped
together. The glue then wicks into the joints and sets. YMMV
Apart from the normal unplugging from all power and other equipment, be VERY
careful to ensure there is no HV stored in capacitors or by the CRT. Not
usually lethal, but can cause galvanic responses in muscles that tears flesh
on sharp bits of the chassis, or even propels the monitor off the bench. An
imploding CRT is not something you want at your feet!

Re: Monitor High Pitch Whistle

And a quick discharge does not seem to finish the job. My memory tells me I
was stung from CRT that had been discharged, and then seemed to gather some
more charge from somewhere. If you can keep a wire link from the ultor to
the aquadag you will be pretty safe.
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