On Tue, 01 Sep 2020 11:17:47 +0200, Philippe Frossard writes:
>The wl1835 doesn't work on LiPo battery when DC 5v is disconnected,
>I read about diode D2 on the board ...
>I would like to know if this diode is the solution ?

it is, at least according to the bbbw schematic
at 
https://github.com/beagleboard/beaglebone-black-wireless/blob/master/BeagleBone_Black_Wireless_SCH.pdf
(top left corner of the 'wifi module' section).

for unknown reasons the bbbw designers have marked it 'dnp' (do not populate)
on the schematic.

regards
az


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