Hardware Reference
In-Depth Information
While it may seem that a 1 A power supply should be enough to supply a 700 mA
Raspberry Pi, you will be better off using a 2 A supply instead. Many power supplies
simply don't deliver their full advertised ratings.
The micro-USB cable is something else to suspect. Some are manufactured with thin
conductors that can result in a significant voltage drop. Measuring the voltage as shown
previously in the “Voltage Test” section may help diagnose that. Try a higher-quality cable
to see whether there is an improvement.
No Power
If your Pi appears dead, even though power is present at the input, the input polyfuse
could have blown. If this was a recent event, allow the unit to cool down. The polymer
in the fuse recrystallizes, but this can take several hours. If you think the F3 poly fuse is
permanently destroyed, see the Linux wiki page
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for how to test it.
