*BSD News Article 90364


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From: tedm@agora.rdrop.com (Ted Mittelstaedt)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: wavy video under X ?
Date: 5 Mar 1997 07:17:22 GMT
Organization: Cool Dudes Inc.
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In article <5fi3dh$7hc@saluki-news.it.siu.edu>, jimd@dutton4.it.siu.edu (Jim Dutton) says:
>
>I have been running X11R6.1 (XFree86) for some time now, and lately, the
>screen has begun to wave (on a Gateway-2000, Vivtron 1572 monitor). I used
>

Have you tried this monitor out on any other computers that are running
any other operating systems?

It is possible to overdrive a monitor to the point of burning out
components, however if the monitor is properly displaying a picture
it is highly unlikely, espically as most newer better monitors are
microprocessor controlled and have circuitry in them to block out
too high sync frequencies.

Waviness sometimes is a result of a 60 cycle AC hum being introduced
from an external source, or perhaps a failed diode in the monitor power
supply. If it is the latter, you probably want to get it into a repair
shop before the damage gets any worse.  I've seen monitors wave when
placed next to a wall that had a electrical power cable embedded in it.

Ted