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by emilio-movi
Wed May 09, 2018 7:16 am
Forum: HATs and other add-ons
Topic: PI3B+ not work when powered by GPIO pins
Replies: 11
Views: 3671

Re: PI3B+ not work when powered by GPIO pins

We made more tests, and we discovered that the problem is not really the +5V but in some manner is the +3.3V In few words, we have develooped an expansion board for interface digital inputs to Raspberry by photocoupler; there is a power supply on the expansion board providing +5V to itself and to Ra...
by emilio-movi
Tue May 08, 2018 2:01 pm
Forum: HATs and other add-ons
Topic: PI3B+ not work when powered by GPIO pins
Replies: 11
Views: 3671

PI3B+ not work when powered by GPIO pins

We have a new board PI 3B+. It works fine when it is standalone, powered by USB power supply. We try to power on by GPIO pin n. 2, 4 (+5V) and GND on pins 6, 9, 14, 20, 25, 30, 34, 39. In this case the board not work. It turn on its red LED POWER OK, but the green LED ACT is always turned off. Impor...

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