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janny666
1 Nickel

Dell Inspiron 7548 - Coil Whine

Hi,

my laptop makes weird noise (some electric, buzzing noise). It happend if my battery level is 100% and AC is plug in. Do someone have same problem ? It probably issue named Coil Whine. Any fix? BIOS update ?

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8 Replies
LSUFAN51
5 Rhenium

RE: Dell Inspiron 7548 - Coil Whine

What is your Dell model number and windows version ? Example:  Dell Inspiron 3543, windows 10

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janny666
1 Nickel

RE: Dell Inspiron 7548 - Coil Whine

Dell Inspiron 7548 and I had tested it  on Windows 8.1, Windows 10, Ubuntu 14.10, Ubuntu 15.10. Always the same issue on all OS. 

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LSUFAN51
5 Rhenium

RE: Dell Inspiron 7548 - Coil Whine

Please check the System Setup(BIOS) by typing msinfo32 into the Cortana bar or the Search box. Write down the BIOS version and go to your Product Support page.

https://youtu.be/mWn9YfxtYBo

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LSUFAN51
5 Rhenium

RE: Dell Inspiron 7548 - Coil Whine

Here's your Dell Product Support page. Please click on the link below:

www.dell.com/.../drivers

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janny666
1 Nickel

RE: Dell Inspiron 7548 - Coil Whine

BIOS Version : Dell Inc. A05, 20.07.2015

I already have the newest version of BIOS. 

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lampra
1 Copper

RE: Dell Inspiron 7548 - Coil Whine

Hi, I have the same problem using Ubuntu 14.04 dual boot with win10.

One way to overpass his problem after boot is to logout from ubuntu and login again.

I get this error from dmesg:

[   41.044920] [drm:si_dpm_set_power_state] *ERROR* si_upload_sw_state failed
[   43.865577] [drm:gen8_irq_handler] *ERROR* Pipe A FIFO underrun

Edit: Logout and login just resets brightness. It seems that the issue appears when brightness is set to less than a half. So increase the brightness to overpass the problem until Dell solves it.

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janny666
1 Nickel

RE: Dell Inspiron 7548 - Coil Whine

I called to servise center, they told me, it is known issue. They dont have any fix for that. My motherboard was replaced but it didnt help. 

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GambitGR
1 Copper

RE: Dell Inspiron 7548 - Coil Whine

This kinda old post but I just found the reason of the coil whine. At least for my 7548 its the Monitor dim. I dont like brightness at night so I have my monitor dimmed at about 50%. Specially when there's no other noise around I can hear that annoying whine from the notebook (7548 touch screen fhd etc etc). When it was under warranty I was calling service but there was no whine because all the calls where in the day time and there were no whine because at those times I had the brightness full. So I couldnt explain to dell why its happening. Im writing now because I just realized it accidentally. Having brightness at less than 75% whines. 75% + No whine. (Im having this issue only when ac is plugged). Hope it helps if you havent thrown away this awful laptop yet.

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