I have a NanoVNA-H4 which has been working for months. Today I needed to test a broadcast band filter and when I try to enter any number on the number screen (for setting stimulus start/end etc.) the screen goes fully white. All other functions of the NanoVNA seem to be working fine, only the touchscreen is bad. I've re-done the touchscreen calibration (which works normally), saved it, and done the touchscreen test which doesn't indicate any problem -- I can drag the guitar pick up, down, right, left, and diagonally in any part of the screen and it looks fine.
I see in searching for this problem many people have had touchscreen issues, but none just like this. I will try flashing a different version of the firmware (this is Dislord's 1.2.40) and following that if needed I'll disassemble the case to inspect the ribbon cable. Any other suggestions?
