V2_2(clone) won't boot up screen stays white

[wojciechna]

Hi
I would like to refresh topick.
I have the same Nanovna V2.2 colne and similar problem. When i bought it after turn it on display stayed white and noticed that if I pluged cabble in when swith was off, whaited couple seconds than turrn it on and vna started normaly. That was before I updated firmware version to nanovna-v2-20201013-v2_2_8 in the way described here: https://nanorfe.com/nanovna-versions.html .But on Macbook. I couldn't do this on Windows due to the NanoVNA-QT was turning off after opening firmware BIN file. Old firmware was from 2020 May I think made by edy555. Now Nanovna screen stay white all the time. I can still use it but only on PC with NanoVNA-QT. I tried disconect and connect batery but it didn,t help. My PCB doesn't contain C712 described here: #18 (even slots on PCB for this CAP are empty). I thout meybe it would help to do clearconfig via PuTTY but I dont get any respond in PuTTY terminal, propably I do something wrong(here I've found that you can do clearconfig: http://tatek.home.pl/j3/images/warsztat/elek/nanovna02/NanoVNAUpg_17.jpg). Anny ideas what can help ? I was thinking abut bridging C711 to C712 described #18 but just woried about to do not burn anything :). I would aprishiate anny help. Thanks

Originally posted by @wojciechna in #18 (comment)