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From: psimpson@oucsace.cs.OHIOU.EDU (Pete Simpson)
Newsgroups: comp.sys.apple2
Subject: Re: High-pitced noise from monitor
Summary: probably IS flyback whine
Message-ID: <2981@oucsace.cs.OHIOU.EDU>
Date: 22 Feb 91 05:20:40 GMT
References: <44506@ut-emx.uucp>
Organization: Ohio University CS Dept., Athens
Lines: 26

In article <44506@ut-emx.uucp>, daveh@ccwf.cc.utexas.edu (David H. Huang) writes:
> Lately, my AppleColor RGB monitor has been making a high pitched
> noise. It's not very loud, but it is very annoying. I've heard that on
> the B/W Macs, this is usually caused by a bad connection around the
> flyback transformer. Could that be my problem?
> 
> -- 
> David Huang                                 |

	Yep, that would be my guess... look for a loose ground connection.
You can get the same "noise" on an Apple Monitor /// if you disconnect the
incoming signal, and then drive the brightness ALL the way up (at least this
works on mine).  I used to work in the Engineering dept at WOUB-TV here at OU,
and I'd notice monitors "screaming" that others people didnt notice.
Apparantly not everyone can hear it.

	As my video production classes would say, "technically thats called
'flyback whine'".

pete

-- 
Pete Simpson                      |Amateur Radio: KB9DWN
Video Production/Computer Science |Bitnet: TCOMGRD1 at OUACCVMB
Ohio University, Athens, Ohio     |Internet: psimpson@oucsace.cs.ohiou.edu
Denizens of Doom: 213             |American Motorcycle Association: ??? 


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