Weird PC speaker sound - buzzing on power up \ VOGONS

Weird PC speaker sound - buzzing on power up

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First post, by kixs

Posted on 2018-08-28, 22:15

kixs Offline

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Well, the motherboard doesn't POST and the POST beep is a 2 seconds long buzz.

Here is a video clip, sound is at 31 seconds.
http://www.filedropper.com/mah06633

What does it mean? What is wrong?

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Reply 1 of 6, by Vaudane

Posted on 2018-08-28, 22:37

Vaudane Offline

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It seems to happen as soon as you turn it on, which leads me to think there's a short circuit somewhere. Check for solder blobs, bits of random wire. Reseat everything, giving it a good clean with IPA and see if that sorts it.

Reply 2 of 6, by kixs

Posted on 2018-08-29, 06:35

kixs Offline

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Yes. It's starts the buzz around 1 sec after the power on. Thanks for suggestion. I'll check if there is anything suspicious... Although the board is in a quite good visual condition.

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Reply 3 of 6, by Marek

Posted on 2018-08-29, 09:57

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Some boards make this sound when the fan or temperature alert triggers. Can you get a picture on your monitor? If yes, check out the health status in the BIOS setup. Make sure there is no fan alert activated where no fan is connected to the board.
When using a fan, a short beep like this can happen while the fan starts up spinning.

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Reply 4 of 6, by kixs

Posted on 2018-08-29, 10:03

kixs Offline

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No signal. As said, it doesn't POST. It's a 486 board so there are no thermal sensors.

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Reply 5 of 6, by kixs

Posted on 2018-08-29, 21:02

kixs Offline

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How about wrong BIOS or corrupted BIOS? How would this show?

I have another one of this boards. It a few month newer and in brown PCB. The bios sticker is quite different. Also the year written on BIOS sticker is 1993 on this one and 1995 on the newer one. Could someone swapped the BIOS chip?

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Reply 6 of 6, by manicgamer

Posted on 2018-09-07, 21:15

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Sounds like a duff leaking capacitor. Check all caps with a meter. The buzz is mains static hum which is not being filtered correctly.

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