Hello,
I got my NanoVNA V2 Plus4 around one year ago from tindie, so it's not a clone.
>From the beginning it came up most time with a white screen, but not always.
Then I didn't try it for about one year.
Some weeks ago, I was able to use it for some days, just after removing the USB cable after charging.
I was able to make a firmware update to version 20211227 (stable).
One time, the device came up with a 90° display rotation, after a reboot it was normal. 0° and 180° are good, but 90° should not happen
Some days later the white screen returned, and is now permanent.
I can use it via USB with vna_qt.exe and it works well.
Today I tried to analyze the display interface (CONN303) to make sure, that only the display is broken:
* There's activity on the SCK pin (8), but the signal level is between ~1.5 and 3.0V, it doesn't go down to ground, is that correct ?
* There's activity on the SDI pin (9), that signal looks like the controller is sending data to the display. I've attached some screenshots
* My probes are probably to slow to measure the fast signals exactly
Can somebody help me please. I hope that only the display is broken.
I found one at AliExpress https://www.aliexpress.com/item/1005002630985118.html which looks same.
Can I order it and insert it or do I need a preconfigured display from Tindie ?
Greetings
Norbert
