That is a problem with the charge/inverter chip.
A number of users have the same issue and have had to add a momentary switch between pin5, through a 5K R to ground to turn on and off.
Per hugen - try changing the 10uF caps around the charge controller.
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On Tuesday, October 29, 2019, 1:18:52 p.m. GMT-4, Nick <g3vnc@...> wrote:
There may be a problem with NanoVNA-Q v 0.4.2.
Left nanovna switched off but connected to running PC for about 3 hours.
After 3 hours the charge LED was still flashing and the device would not switch on.
Unplugged from USB and it switched on OK.? On the Version page the battery voltage read 4107mV.
The nanovna never stops charging - the charge LED stays flashing.? Does it overcharge the battery?
Reflashed with NanoVNA-H_20191018.dfu and problem goes away.
