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Some iPhone 7 handsets are emitting a loud hissing sound

It’s been two weeks since the launch of the iPhone 7 and iPhone 7 Plus and in keeping with tradition, there’s a problem.

While this problem isn’t as terrible as “BendGate” was, it is annoying. Blogger and Apple fan, Stephen Hackett has discovered that the iPhone 7 Plus is exhibiting a hiss when in use.

“As my iPhone 7 Plus was restoring from iCloud, I thought I noticed some sound. After picking the device up from my desk, it was clear the sounds are coming from back of the phone, possibly from the CPU. It seems to get worse if the iPhone is under load,” wrote Hackett.

The blogger went so far as to record audio of the hiss and uploaded it to YouTube.

The most likely explanation for this hiss is coil whine.

While this phenomenon is common in desktop computers and notebooks, it can happen in smartphones as well.

Simply put, coil whine occurs when the power running through an inductor (a coil that regulates the power making it more stable) reaches a certain resonant frequency. This in turn causes vibration which ultimately makes a buzz or hissing sound.

This is not something to be worried about, in fact it means that the phone is working as it should be. Trouble is that its rather annoying. Hackett was able to get a replacement handset after speaking with AppleCare but Apple hasn’t released an official statement about coil whine as of time of writing.

We should also point out that both Ars Technica and Hackett have said they aren’t aware of how widespread the problem is and if this is just limited to a few handsets.

There have been suggestions that the noise might be the result of radio frequency interference handset but the noise is coming from the area where the CPU is housed rather than the speaker so its unlikely that the cause is stray radio waves.

As a bit of a bonus, check out the tear-down of the iPhone 7 done by the folks over at iFixit to see exactly where Apple puts its A10 CPU, Taptic Engine and numerous spaces where a 3.5mm jack could have been housed.

[Via – Ars Technica]

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