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My nanoVNA arrived in Dec and functions just fine in RF terms. The touch screen has never been correct and the numerical input from the pad has not worked. It is:
ch> info
Kernel: 4.0.0
Compiler: GCC 8.2.1 20181213 (release) [gcc-8-branch revision 267074]
Architecture: ARMv6-M
Core Variant: Cortex-M0
Port Info: Preemption through NMI
Platform: STM32F072xB Entry Level Medium Density devices
Board: NanoVNA-H
Build time: Oct 18 2019 - 16:10:54

Here is what happens. If I do a serial controlled cal I see the following:
ch> touchcal
first touch upper left, then lower right...done
touch cal params: 3776 562 -30 192
ch> saveconfig
Config saved.
ch> touchtest
then moving the stylus vertically (y-axis) has results as expected. But movements horizontally are in the wrong direction and they also cause movement in the y direction. The result is that only about half of the screen is accessible in a sort-of diagonal pattern.

Yes, I did use the upper-left and lower-right corners to cal, as marked on the screen.

If I try to out-smart it and use the wrong corners, there are different, but very-wrong results.

Am I doing this right? Has anybody else had such a problem? I do not see indications of such on a forum search.

Thanks, Bob W7PUA

Here is a picture when running a stylus all over the screen in a touch test

It sounds like you may have a bad touchscreen or, make sure that
There is nothing pinching the touchscreen around the front bezel.?You can remove the 4 screws on the front bezel and do a visual chaek ofnthe touch surface.?


On Sun, 12 Jan 2020 at 6:33 PM, Bob Larkin<bob@...> wrote: My nanoVNA arrived in Dec and functions just fine in RF terms. The touch screen has never been correct and the numerical input from the pad has not worked.? It is:
ch> info
Kernel:? ? ? 4.0.0
Compiler:? ? GCC 8.2.1 20181213 (release) [gcc-8-branch revision 267074]
Architecture: ARMv6-M
Core Variant: Cortex-M0
Port Info:? ? Preemption through NMI
Platform:? ? STM32F072xB Entry Level Medium Density devices
Board:? ? ? ? NanoVNA-H
Build time:? Oct 18 2019 - 16:10:54

Here is what happens.? If I do a serial controlled cal I see the following:
ch> touchcal
first touch upper left, then lower right...done
touch cal params: 3776 562 -30 192
ch> saveconfig
Config saved.
ch> touchtest
then moving the stylus vertically (y-axis) has results as expected.? But movements horizontally are in the wrong direction and they also cause movement in the y direction.? The result is that only about half of the screen is accessible in a sort-of diagonal pattern.

Yes, I did use the upper-left and lower-right corners to cal, as marked on the screen.

If I try to out-smart it and use the wrong corners, there are different, but very-wrong results.

Am I doing this right?? Has anybody else had such a problem?? I do not see indications of such on a forum search.

Thanks, Bob? W7PUA

I don't know where the picture at groups.io went. Try

Bob

Bob Larkin wrote:

Here is a picture when running a stylus all over the screen in a touch test

Take the four screws holding the screen bezel down, and check to see if there aren't scraps of the plastic film still stuck under there. I had that problem for a few minutes when mine arrived, until I noticed a tiny corner of the film sticking out of the bezel.

--
wes will
n9kdy

Thanks for the ideas, guys. There was a tiny amount of plastic film under the bezel. But, removing it made no difference. Operating with the bezel off is no different, either. There does not seem to be a visually detectable problem. Bob W7PUA

We are very sorry for this situation, it seems that the touch screen was damaged during transportation, if you buy a model made by us, we can provide the accessories for free, please contact your dealer. If you buy through alibaba, we will send you a new one for free.

hugen

Problem Solved - Solder Connection
I removed the display unit by carefully lifting it from the left side. It is held down by some "sticky tape." The right side has a printed flex cable that needs to be treated carefully. The display folds up; I took it to about 90 degrees. Where the flex hooks to the green board there were three pins, 16, 17 and 18 that looked "different." I added flux and re-soldered these. Presto, everything works fine. The "touchcal" command now gives totally different answers:
touch cal params: 487 659 145 182
and the touchtest command follows the stylus.

Thanks, hugen, for the offer, but I'm glad to say that all is now well. Two pictures:



Bob W7PUA

The exact same case. While calibrating only "Y" axis is working. The horizontal "X" axis was always stuck at the very screen edge. I followed Bob's solution - re-solder the flex cable and now works like a charm. 73 de SV1ONK