=20

-----Original Message-----
From: piclist-bounces@MIT.EDU [mailto:piclist-bounces@MIT.EDU] On Behalf =
Of
Lindy Mayfield
Sent: Monday, May 16, 2005 8:33 AM
To: Microcontroller discussion list - Public.
Subject: RE: [EE] replacing a faulty capacitor on a T.V

=20

I read this a lot, and I believe it.  But I was always curious how the =
experts
discharge these caps? =20

-------------------------------------------------------------------------=
-----

=20

The really nasty "cap" of biggest concern here is the CRT. The design of =
a CRT=20

creates a fairly high value capacitor which becomes charged to 2nd anode

voltage during operation. This could be as high as 40 kV, and is almost =
always
above 15 kV. It can retain this charge for a LONG time. It is DEADLY.

=20

I use a homemade shorting wand. An 18 inch long piece of 1 inch dia. PVC =
pipe

With a 1 meg ohm resistor epoxied into the end. Leave the protruding =
resistor
lead full length. The opposite lead is connected to an 18 inch length of =
hookup=20

wire with a clip attached.

=20

In use, the ground clip is attached to chassis ground (make sure that it =
is in
common with the conductive coating on the rear of the CRT), then use an =
all

plastic tool (Plexiglas,lexan, etc.) to lift the edge of the plastic =
anode cap

until the anode connector is visible, then touch the anode connector =
with the

shorting wand probe. Hold it in place for at least a minute.

=20

I agree with other posters, anyone contemplating working inside a TV for =
the
first time should go find some experienced help. These things can be =
dealt with

safely, BUT if proper procedures are not followed they can KILL you.=20

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