Monitor tilt - return it?

From: Joe <>
Date: Wed Sep 1 18:13:59 1999


At 07:08 PM 9/1/99 +0100, you wrote:
>> At 09:56 PM 8/31/99 -0700, Don wrote:
>> >
>> >And I being more cowardly like to power down and let sit for a while and
>> >make the adjustment 'cold'. Then power up and see how you did. Repeat if
>> >necessary.
>[Could you please limit your line length to something sane, like 80
>characters max]

   It should be now. Let me know how many chars/line you're getting.
>> That's the smart way to do it! That CRT high voltage sure hurts! But
>Colour is a lot worse than monochrome...

    But they both hurt! Color TVs use ~25kV and if I remember right most
B/W sets use ~18 to 20 kV depending on the CRT size.
>But to rotate the yoke, you're not working very near the EHT. The only
>thing you have to worry about is the 1kV-ish pulses on the horizontal
>deflection coils.

   Unless the HV arcs. I've seen it happen more than once. Even 1000
volts isn't pleasant!
>> beware that the CRT can act like a capacitor and store charges for a LONG
>> time. I used to take new CRTS out of the shipping boxs where they had been
>> sitting for a year or more and they would still bite me! Also most
>> monitors and TVs have a hot chassis and one side of the AC line is
>> connected directly to the frame. So unplug them before touching it and
>Not really.
>TVs : Certainly in Europe, almost all modern TVs have an isolated
>chassis. Mainly because all our TVs have a 'SCART socket' which carries
>line-level audio, composite video, RGB, etc. It's a lot easier to isolate
>the PSU (most TVs have an SMPSU anyway) than to isolate the dozen or so
>signals on that socket. I can't comment on US-TVs, though -- are they
>really still hot-chassis?

    Yeap, unless they've changed in the last couple of years.
>Monitors : For much the same reason (it's hard to isolate a composite
>video signal, at least without mangling it), almost all monitors have
>an isolated chassis. Having worked on dozens of monitors from just about
>every manufacturer, I've come across exactly _1_ that had a hot chassis -
>the 110V version of the TRS-80 model 1 monitor. Every other monitor has
>been isolated.

   I've only worked on a few monitors so I'm not an expert but why take a
chance? The TRS model I monitor was a modified TV. It and others like it
would almost certainly have a hot chassis.
>I don't think finding a hot-chassis is much of a worry here.

   Then you're lucky!

Received on Wed Sep 01 1999 - 18:13:59 BST

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