daveh@ccwf.cc.utexas.edu (David H. Huang) (02/21/91)
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 | Internet: daveh@ccwf.cc.utexas.edu | "Slight accidents with funny rays UUCP: ...!ut-emx!ccwf.cc.utexas.edu!daveh | can have serious consequences" America Online: DrWho29 |
psimpson@oucsace.cs.OHIOU.EDU (Pete Simpson) (02/22/91)
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: ???
daveh@ccwf.cc.utexas.edu (David H. Huang) (02/23/91)
In article <2981@oucsace.cs.OHIOU.EDU> psimpson@oucsace.cs.OHIOU.EDU (Pete Simpson) writes: > Yep, that would be my guess... look for a loose ground connection. I checked yesterday, and I didn't find any visibly loose connections. The noise seems to go away every once in a while. It's been on for about an hour now, and I haven't heard anything from it. If it does decide to come back, do you think reheating the solder connections would help? Don't worry, I won't get zapped by 15,000V (at least I hope not :-) Thanks! >-- >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: ??? -- David Huang | Internet: daveh@ccwf.cc.utexas.edu | "Slight accidents with funny rays UUCP: ...!ut-emx!ccwf.cc.utexas.edu!daveh | can have serious consequences" America Online: DrWho29 |
daveh@ccwf.cc.utexas.edu (David H. Huang) (02/23/91)
In article <44583@ut-emx.uucp> daveh@ccwf.cc.utexas.edu (David H. Huang) writes: >The noise seems to go away every once in a while. It's been on for ^^^^ >about an hour now, and I haven't heard anything from it. If it does BTW, "it's" refers to the monitor, not the noise, just in case you were confused. -- David Huang | Internet: daveh@ccwf.cc.utexas.edu | "Slight accidents with funny rays UUCP: ...!ut-emx!ccwf.cc.utexas.edu!daveh | can have serious consequences" America Online: DrWho29 |
greg@hoss.unl.edu (Lig Lury Jr.) (02/23/91)
... 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? On a similar subject, anyone know the cause of high pitches coming from a IIgs, becoming lower in pitch and more noticeable when a menu is pulled down? I think it is coming from the built-in speaker, but it might be from the monitor, but it is strange that it (apparently) reduces in pitch the futher down the mouse is dragged down the menu. It is a non-Woz upgraded to ROM 01. >-- >David Huang | >Internet: daveh@ccwf.cc.utexas.edu | "Slight accidents with funny rays >UUCP: ...!ut-emx!ccwf.cc.utexas.edu!daveh | can have serious consequences" >America Online: DrWho29 | -- /// ____ \\\ DON'T \"Have you ever been to Belgium in fact?" "I think | |/ / \ \| | PANIC \ that you should restrict that sort of remark to \\_( \==/ )_// Lig Lury, Jr. \ something artistic." "You sound as if I just \__\\/ greg@hoss.unl.edu \ said something unspeakably rude." "You did."
timk@meaddata.com (Tim Klein) (02/26/91)
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? I had the same problem with a composite monitor. It bothered the *?@@%^ out of me for weeks until I accidentally knocked off the book that had been lying on top of it. It seems that putting pressure on the top of the monitor caused it to squeal for some arcane reason! I've since seen two others that suffered from the same problem. =========================================================================== Timothy Klein I wish TV had a knob so you could turn up timk@meaddata.com the intelligence. The one marked Brightness ...!uunet!meaddata!timk doesn't work. -- Gallagher
peterc@pro-micol.cts.com (Peter Cameron) (02/26/91)
In-Reply-To: message from greg@hoss.unl.edu I've notived the same sounds emanating from the speaker of my IIgs as well. I It also does that during disk access sometimes. I also have the ROM 01 non-WOZ machine.
daveh@ccwf.cc.utexas.edu (David H. Huang) (02/27/91)
In article <3007@meaddata.meaddata.com> timk@meaddata.com (Tim Klein) writes: | |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? | |I had the same problem with a composite monitor. It bothered the *?@@%^ |out of me for weeks until I accidentally knocked off the book that had |been lying on top of it. It seems that putting pressure on the top of |the monitor caused it to squeal for some arcane reason! | |I've since seen two others that suffered from the same problem. This sounds a lot like the cause of my problem... The day the squealing began, I had put a small monochrome monitor on top if it (temporarily). After I took the monitor off, the squealing became more intermittent, and I haven't heard anything from it lately. |=========================================================================== |Timothy Klein I wish TV had a knob so you could turn up |timk@meaddata.com the intelligence. The one marked Brightness |...!uunet!meaddata!timk doesn't work. -- Gallagher -- David Huang | Internet: daveh@ccwf.cc.utexas.edu | "Slight accidents with funny rays UUCP: ...!ut-emx!ccwf.cc.utexas.edu!daveh | can have serious consequences" America Online: DrWho29 |
leed@pro-nsdapple.cts.com (Lee Dronick) (02/27/91)
In-Reply-To: message from daveh@ccwf.cc.utexas.edu My son's friend called me over to his house to check on a high pitched noise from his GS monitor. Well there was no display as well, but the noise was caused by cracked CRT. Here at work we also had a "squeal" from a GS monitor that was caused by a bad power supply. I hope what you have is nothing as serious or expensive. ---- ProLine: leed@pro-nsdapple Internet: leed@pro-nsdapple UUCP: crash!pro-nsdapple!leed ARPA: crash!pro-nsdapple!leed@nosc.mil
zane@ddsw1.MCS.COM (Sameer Parekh) (02/27/91)
In article <1991Feb23.024425.16264@hoss.unl.edu> greg@hoss.unl.edu (Lig Lury Jr.) writes: > >On a similar subject, anyone know the cause of high pitches coming from >a IIgs, becoming lower in pitch and more noticeable when a menu is pulled >down? I think it is coming from the built-in speaker, but it might be >from the monitor, but it is strange that it (apparently) reduces in pitch >the futher down the mouse is dragged down the menu. It is a non-Woz >upgraded to ROM 01. > That happens to me too. I don't think it is the speaker NOR the monitor. . .I was reading in _Hackers_ about that computer that started with an A which, when the processor executed certain instructions, it emitted a certain tone. Some hacker hacked up a program to play music. Once when I wanted to convert some SHR pics to GIFs with SHRConvert, it was taking a long time, so I turned it on, read a book, and when I heard the pitch change I knew it was done. -- zane@ddsw1.MCS.COM