On a Raspberry Pi 3, I had a problem with a particular power supply (5V 3A - IC controller, all caps changed) which there is disk activity but no HDMI output; when I disconnected the Micro USB power cable and reconnected it with the power supply on, the problem did not occur.
So I made a simple power-on delay switch (555 based) which turns on after about two seconds after the power supply starts up so I can avoid this problem in my particular installation.
So I made a simple power-on delay switch (555 based) which turns on after about two seconds after the power supply starts up so I can avoid this problem in my particular installation.
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