Is there any current limits of USB ports on Raspberry Pi 3? If yes, which chip is responsible for that? There are 4 USB ports, If each port can give maximum 500mA, it makes 2A for all 4 ports. RPi itself needs also app. 1A, so a 3A power supply must be used. What happens If I use 2A power supply?
I didn't find any schematic for RPi3. Only reduced schematic. It does not show where the power lines of the usb ports are connected.
I am asking because, I attached a DVB-T dongle directly to one of the USB ports. I scan for channels using tvheadend software, but there are lots of error messages saying "no scan data" or similar (DVB-T Stick is recognized). I am suspecting that DVB-T dongle needs more power than USB limit. Before I buy a powered USB Hub, I want to be sure that RPi limits the current.