Hello,
I have a NanoVNA-H4, since 1 year, that worked fine until yesterday: I left it running overnight and this morning I found it with the screen frozen and unresponsive. Cycling power it now shows a blank screen, only the backlight is on (and the blue LED inside). The serial port is also no longer recognized by the PC.
The strange thing is that DFU mode works, flashing a new FW succeeds but then it still does not power on properly
I've checked the internal VCC and VDD voltages and they look ok, at 4.23 V and 3.26 V, respectively.
Tried leaving it off a few hours, disconnecting the battery and powering via USB only but to no avail.
Any suggestion about what to check next?
