Pine A64 Plus Fails to Boot

[MarkHaysHarris777]

TinkerBear,  this is also for Pete, the problem <snip>

Sorry Macrus, this does NOT apply to me... I am not, and have never run from a wall wart PSU, but from a 4A DC-DC PSU set at 5.25v,  <snip>

hi Pete,  look cloooser...   I did not say it applies to you, I said the response is also for you .

...  that means that I'm responding to two people at once, rather than just TinkerBear  (whether it applies to you is another colored horse)  <sorry for the confusion>  

Again, the problem is NOT the rating on the PSU;  its the bootup current spikes, and its also the fact that switching power supplies that are not properly filtered will cause problems for the PMIC;  and the PMIC axp803 is very sensitive. 

If there is even a small ripple in the DC-DC converter output the PMIC WILL shutdown. and the board will go dead.

TinkerBear's idea of a small cap added to the board itself is interesting (and may be easier, depending upon skills) but I chose to filter the DCIN so that the ripple is non-existent.  For other people as well,  this might apply more stringently if the user plans to install the pine board in an automobile or plans to use the SLA battery schema.