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echo: tech
to: CHARLES ANGELICH
from: WAYNE CHIRNSIDE
date: 2004-12-02 11:19:52
subject: Re: broken ON switch

-> WC>> My own experiences with electricity has not been without
-> WC>> incident thus I tend to err on the side of caution with no
-> WC>> dependence on luck. 

-> CS> Careful with monitors. Like old TV sets, has a coil that
-> CS> stores a whollap of a charge even unplugged. Be sure you
-> CS> know what you are about if you are taking the case off the
-> CS> monitor. xxcarol 

-> Odd as it might seem with my abysmal ignorance of electronics I
-> _do_ know about the possibility of shock/death even when a TV
-> or monitor is unplugged but thanks for the warning (a week too
-> late). 

I did caution you if you weren't familiar with high voltage
to get a friend who's more comfportable to help.

It's actually the capacitors and CRT that poses
the greatest threat.

In a low humidity environment the CRT can retain a couple tens of
thousands of volts charge for a few days.

I've a current limited discharge wand with insulated handle 
for this and another different value cable to discharge
relatively high voltage capacitors.

Coils only pose a threat ( flyback) when energized or
_disconnected_ from a power source.

When the contact is broken a back EMF can hit you pretty badly.

Well I guess since you're still with us you're wiser for the
experience ;-) 
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