High pitched noise

I noticed recently my GL-MIFI start to generate high pitched noise when operating. Not sure if the noise come from PCB, Modem or battery. It’s kind of annoying.

Recording of the noise attached

Any ideas?

Mifinoise.zip (236.4 KB)

Your file cannot be accessed.

The noice is generally from the PCB.

I reuploaded the recording. The sound is kind of faint in the recording. But super annoy when you sit nearby. Just wondering if it could be repaired. Or best is to replace the MIFI

Unfortunately this cannot be repaired.

Are you using AC power? Generally it may have noise when you are using AC power input. But battery should be fine.

If this is the case, try change one power adapter.

No, it is on battery power.