On Mon, 27 Mar 2006 19:03:04 -0500, William P.N. Smith
Gave us:

Don Bruder wrote:
At the voltages that can be running around in the back of a crt,
cleaning out accumulated "crud" is a damn good idea, since, as you say,
some of it may well be (semi)conductive.

Even if it's inert, it'll have a negative impact 'cause it's acting as a
blanket, keeping components hotter than they would be if running in
"free air" conditions.

Just make sure you know where the high-voltage connector is, and how
to discharge it,

It doesn't need to be discharged if he leaves the damned connector
alone, aside from cleaning it off with air or a duster! It is best NOT
to discharge it. The connector is usually well sealed, and one
doesn't want to break that seal. Also, the flyback current limit
resistor can be damaged, though should be designed well enough to take
it.

these things can hold a lethal charge long after you
unplug them...

Unplugging the AC line cord is one thing, but there is no need to
unplug an anode wire that is not already leaking!

IIRC you want to clean around the high-voltage power
supply, lead, and tube connector with isopropyl.


He can merely use a duster brush, and compressed air for the entire
job. The goal is to reduce leakage form corona and reduce heat from
dust blanketing. No need to douse the damned OLD thing with a
solvent!