Hi David,
Thank you for your answer.
In between, i found the "problem".
The USB port was connected to a battery powered PC.
The NanoVNA's CH0 port was connected to a grounded frequency meter,? powered by the main.
After a main power fail, a fatal overvoltage arrived and the NanoVNA's USB interface was killed.
Results, no more USB connection; no red line active and no battery charging possible.
May be, a better USB protection would be required...but for the price...
Regards,
Rudi
PS I ordered a NanoVNA-H4 and i will take it totally disconnected when not in use...
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Le 19.06.2020 ¨¤ 10:36, David J Taylor via groups.io a ¨¦crit?:
Hello,
Since this morning, my NanoVNA-H don't accept the USB connection.
I tried on 3 different PCs, no success.
On battery, all is ok but i'm not able to do charging.
I suspect an USB interface failure but i'm not sure...
What can i do ?
Thank you for your help.
Rudi
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Let's hope it's just dust or dirt in the connector, perhaps remove with a brush.? Or, the connector may have broken off the board enough to have dropped one connection - physical problem rather than anything more complicated.? Tale a look.
Cheers,
David
