There is only hissing noise when the charging port is in use and battery is fully charge. In the second i take out the cabel the noise is away.
I have one cabel connected from computer to the data input and one cabel connected via an usb hub for charging only. I use Jenving Supra USB to Micro USB cabels.
The hissig noise is still there if i connect via my phone also. So is narrowed down to charging port. I feel i have tried everything i can think of
Perhaps if you asked your question with more detail, someone like
@surfgeorge would have helped you sooner!
Traditionally, a
Hissing is a background noise through the speakers or headphones. That is not what you are getting is it??
You hear a fizzing noise that comes from the actual metal box! if you call it Hissing, you confuse people into thinking you have noise on the output, hence why someone correctly hinted at a sensitive IEM, and someone else was guessing ground-loop noise.
The fizzing sound is coming from the charging circuit inside the Mojo, as
@surfgeorge has correctly pointed to.
The level of the fizzing sound depends on the quality of the wall charger you are using, some wall chargers cause a lot less noise.
If you want to get rid of it, either use it on battery mode, or buy a hefty PowerBank, and use that to charge your mojo in desktop mode.
You can charge the powerbank overnight, when not in use.
