I have some strange boot behavior on some of my Raspberry Pi 2.
Setup is as follows:
- RPi2 HDMI connected to TV
- RPi2 Power in connected to USB port on TV
- Ethernet connected
I have a lot of these setups working fine, USB from TV gives 1-1.5A depending on TV Model but most of the time it's always the same model (should give 1.5A).
Now most of those setups work i.e. when I turn on the TV the Raspberry Pi 2 gets power via USB from the TV and boots up but in some setups when I turn on the TV the Raspberry Pi does not boot at all.
The PowerLED (red) and the ActivityLED (green) go on for about a second or two when I power on the TV, then go off again and finally the PowerLED goes on again and stays on but no activity on the SD Card and the RPi does not boot.
And now the REALLY STRANGE part: When I have such a setup that does not work and I disconnect HDMI, turn on the TV and after that plug in the HDMI cable into the Raspberry Pi it works.
Any good ideas what the problem could be that in some of all these similar setups it won't boot but boots fine if HDMI is not connected?