7 inch screen touch calibration

Building Zynthian
1

Hi, I am looking for a solution for the a.m. issue. The touch calibration is not working on my 7" screens. There are two of them. On the first one after starting the calibration, the first spot appears in the middle, I touch it, it blinks red and wouldn’t go on to the next spot. On the second one the first touch in the middle is OK, the second on the top left is OK, but the third on the bottom right would’t recognize the touch, no red blinking at all. The screens are working flawlessly under Rasperry pi OS. Is there a workaround to import the touch settings somehow from that system, or something I could do to make it work? I red through some similar topics, no disconnection-reconnection issue, no undervoltage sign in my case. Thank you in advance!

PS: First screen tried with the last Oram build: Himbeer-Pi 5 7-Zoll-Touchscreen ips 1024x600 HD-LCD-HDMI-kompatibles Display für rpi 4b 3b opi 5 aida64 PC Sekundär bildschirm - AliExpress 7

Second one with the last stable build: 7 inch LCD Display HDMI-kompatibel Touch Bildschirm 1024x600 Auflösung Kapazitiven Touchscreen Unterstützung Systeme für Raspberry pi - AliExpress 502

2

Is your screen a capacative touch? If so, it shouldn’t need calibrating. These usually have good physical stability and calibration. What is the error in the touch calibration? (Is it offset by a little bit? Is it inverted? etc.)

Are you press and holding until the touch is recognised. The calibration process is to touch and hold each crosshair until the next one appears.

3

Capacitive multitouch. Without calibration it has a big offset in the touch position. It seems so, as if there would be some scaling issue, the topleft corner is still OK, but in the middle the touch position is about 2-3cm shifted. When calibrating the longer touch doesn’t help.

4

It may be that the calibration is so far out that it is not detecting the touch within a sensible distance from the crosshairs. Use “Report Issue” button in webconf to raise a support ticket.