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PostPosted: Sat Aug 09, 2014 1:19 am 
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Green Belt
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hi

I have this Motherboard DH55HC with a small Buzzer.
This buzzer pretty loud beeps at the startup.
Howto switch it off?
I have searched already in the BIOS, but cannot find any buzzer settings to disable.


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PostPosted: Sat Aug 09, 2014 1:38 am 
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I think there's a small jumper near that in the middle of 4 pins. you would connect a system speaker on the outer pins instead of the onboard buzzer. however, just removing the jumper should numb the onboard buzzer.

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PostPosted: Sat Aug 09, 2014 2:44 am 
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evasive wrote:
I think there's a small jumper near that in the middle of 4 pins. you would connect a system speaker on the outer pins instead of the onboard buzzer. however, just removing the jumper should numb the onboard buzzer.


Thx, but cannot find this jumper.
Here is a technical manual, but even there I cannot find:

http://www.google.com/url?sa=t&rct=j&q= ... 6100,d.bGQ


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PostPosted: Sat Aug 09, 2014 6:42 am 
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If you have the user's manual, it should detail what the front-panel pinout is. It is your 'friend'. Typically, four pins are reserved for an external system speaker. If two pins have a jumper on them, that redirects the power to a small 'buzzer' on the motherboard. Should also be a small printed diagram of what the front-panel pins are for, either at the header or nearby.
As an alternative, you could put a small bit of electrical tape over its sound port.

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PostPosted: Mon Aug 11, 2014 5:36 am 
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You could also try muffling it with a bit of electrical tape. But the external speaker connector should work.

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PostPosted: Wed Aug 13, 2014 1:35 am 
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Mobo-fu Master
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I think the connector X for the internal mono speaker is in parallell with the buzzer. Normally you would connect a regular speaker in there to get the noise from it. If you put a low-value resistor in that connector it should shunt the buzzer to near silence as i think that has a high impedance.

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PostPosted: Wed Aug 13, 2014 8:53 am 
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A piezo speaker definitely is high impedance.. 5 K ohms or higher.
Noted on page 22 of the manual..
Quote:
The internal mono speaker header allows connectivity to an internal, low-power
speaker for basic system sound capability. The subsystem is capable of driving a
target speaker load of 8 Ohms at 1 W (rms) or 4 Ohms at 1.5 W (rms).

On page 39 it is noted there is a 2-pin connector (item "X") for an internal system speaker.
On page 46 is the diagram and pinout for the front panel header.

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PostPosted: Tue Sep 02, 2014 11:45 am 
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in the extreme U can get a soldering iron and simply remove the buzzer!

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