It seems there are a number of posts now reporting that add-ons using the Pi 3B+ 3V3 supply causes the Pi 3B+ not to boot, disconnecting from the Pi 3B+ 3V3 allows it to do so.emilio-movi wrote: ↑Wed May 09, 2018 7:16 amIn 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 Raspberry through GPIO pins. The board receive the +3.3V generated by Raspberry on GPIO pin 1 and 17. This voltage is required by the transistors of photocouplers.
We confirm that this configuration prevents the PI3B+ to boot: the red power LED is fixed to on, but nothing on HDMI display, etc. When we disconnect the 3.3V (GPIO pin 1 and 17) the PI3B+ boots.
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