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The HDMIPi assembly was originally designed for Raspberry Pi A, with a short lead supplied to power the RPi from the HDHMI driver board. When an RPi B+ or RPi 2 is used, the supplied lead is not suitable for the different disposition of the sockets, as it won't bend into a configuration that will not foul other parts of the assembly. It would be nice to be able to use a flexible, power only, mobile phone charger type, USB lead instead.

I haven't been able to find circuit diagrams to confirm that only the power connections are needed in this cable, so, to be safe, my question is: can I use a power only, mobile phone charger type, USB lead to connect RPi to the HDMI board in an HDMIPi assembly?

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It's always the same. As soon as I posted this question I found that Adafruit publish a circuit diagram for the Raspberry Pi 2 that answers this perfectly, since the only connections to the USB power socket on the left side of the diagram are the two power leads. circuit diagram for the Raspberry Pi 2

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