So I've run into a problem with my Asus Nexus 7 where it no longer charges off the USB port. I don't think the tablet is hanging, I've tried most of the soft fixes I've found for that and had no success. Nothing happens when I charge it, t isn't even warm to the touch.
The background to this is that I have a 15Ah SNUG powerbank with a qualcomm quick charger 3.0 plug, a skross world adaptor with a two port USB charging interface, and a Nexus 7 2013 tablet.
I plugged the tablet and power bank into the charger and it started making strange noises, unplugged one and the noise went away. Charger still works but smells like death inside (can't open it yet) but seems to still charge. Tablet charged for a while and now longer charges.
Bought a new wall adaptor while I was in Darwin. Plugged power bank into new charger, power bank charged up up to 100% (a bit too quickly for my liking) and then refused to charge anything else. Also smells like death inside.
So I'm assuming the skross charger was the culprit.
But my actual question is this, surely a modern smart phone or tablet isn't likely to be affected by a bum charger? As all the battery protection, and charge management sits within the device, surely it can handle a defective USB charger? From my experience with USB devices, the charge rate has more to do with the device than the charger as the device will pull the current it needs, rather than what the charger is capable of supplying, with the charger rating being the peak value?
The other question is, does anyone know if the QI charging system is downstream (after) or upstream (before) the USB charging circuit? I'm hoping I can by a wireless charger as a fix but would like to know if it will actually work
Thanks