Beware of cheap underperforming clones

As of 2023 there are many badly performing clones on the market. V2/3GHz NanoVNA uses parts like ADF4350 and AD8342 which are costly and clones have been cutting costs by using salvaged or reject parts.

See official store and look for V2 Plus4/V2 Plus4 Pro versions only to avoid getting a bad clone. We have stopped selling V2.2 versions since October 2020, so all V2 hardware that are not Plus or Plus4 are not made by us and we can not guarantee performance.

NanoVNA V2 Forum

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I dropped my VNA v2plus4

Edward Prest 2023/03/08 15:52

I pulled it off my desk via the charging cable.  Not really a hard drop but onto a wood floor. It flickered with a bright screen and that's it. Oh crap.
Later that day I took it apart looking for something broken. Same dead screen or sometimes - even  -no white screen. I suspected something with the battery being the heaviest item - or the screen.

So I fiddled around for a while and I started to get the proper display back. The battery was removed several times as I fiddled.

After a while, it just started to behave itself. I inspected everything closely with a jewlers loop. Reassembled it - and its fine now. I tested it plenty, banged it a bit etc.

I don't get it. I suspect maybe a battery vs charging port glitch or ...  software>???  I was running 2020-10 sw and yes, the battery shows 3.8 volts.
Since this I downloaded the linux version of QT and upgraded to the latest stable firmware.  Runs great.

So, what happened?

Siegfried Jackstien 2023/03/09 04:10

maybe the case was pushing against screen??

try it .. switch on with a finger pressed on screen an voila white
screen (on/off and it is back)

a glitch caused by mr lord nelson? yes that is possible (see above test)

dg9bfc sigi

Am 09.03.2023 um 00:52 schrieb Edward Prest:

Edward Prest 2023/03/12 20:41

It runs with QT on a PC - so its likely the screen. I don't see anything broken or cracked.

Siegfried Jackstien 2023/03/13 11:38

Try reseating connector.. If that does not help.. Replace screen

While doing first test.. Look for open solder joints on connector (may cracked
open from drop if not well done)

DG9BFC sigi

Am 13.03.2023 04:41 schrieb Edward Prest <>:

> It runs with QT on a PC - so its likely the screen. I don't see anything
broken or cracked.


* * *

Edward Prest 2023/03/13 18:41

I ordered a screen but it will take 2-3 weeks to arrive from China.

Edward Prest 2023/03/31 20:21

The new screen received but it does not fix the problem. All i get is - all pixels on - but it works remotely just fine.

Does anyone have a proper schematic? Git hub has bits and pieces on a pdf, really amateurish stuff and no mention of the display hookup that I can find.

Edward Prest 2023/04/17 17:09

Fixed. See ( )

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