ArmmiteF407 V5.07.02 betas - Library - No Battery and more.

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Joined: 18/12/2014
Location: Australia
Posts: 854
Posted: 10:24am 05 Sep 2023      

Its definitely a power problem for me. I hacked the adaptor to allow selection of 3.3v from board or the separate 3.3v from via an AMS1117 from external 5V and with external power it works perfectly with 100% backlight. Switch it back and SDCard can't be accessed.
As peter says its the 5" that has problems as its the biggest that does not have a separate 5V supply to the LCD Panel.