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When I place my phone (Samsung S9) under my monitor (MSI https://www.msi.com/Monitor/Optix-MAG322CQP) and that someone call me, the monitor turns off. (It's plug with a DP cable).

Does someone has an explanation about why this is happening ?

Thank you very much.

Edit: Tried the same config at my friend's place, it doesn't turn it off. I will try with an HDMI cable to see if it could be linked.

Mathias Osterhagen
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2 Answers2

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Cell phones have a surprisingly strong output, as much as 36 dBm / 4 watts RF out. The wavelength, from ~0.5 cm (5G high band) to ~32 cm is just right to be picked up by some random piece of wire in the monitor, be rectified by some (overloaded) transistor or diode, and cause something to happen. Placing my cell phone near powered speaker cables, even though shielded, produces beeps in the speaker when the phone periodically tries to contact a tower. BTW, the farther the cell tower, the higher the signal strength the phone uses.

As for damage, it's certainly possible, though hopefully hasn't happened yet. In the future, keep the phone away from sensitive devices.

DrMoishe Pippik
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Thank you @drmoishe-pippik,

So been a while since my original post.

I finally got the answer after multiple tentative/tests etc.. : it was the HDMI cable that I bought in a "cheap" local shop.

I invested in a higher quality and shorter cable. Now, even with my phone literally stick to the the bottom of the screen, nothing happens anymore.

Mathias Osterhagen
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