Touchscreen device works on some Pi's but not others - Raspberry Pi Forums

i'm using hy28b touchscreen part of project, it's been working great on development pi (model b+).

i've purchased several more pi b+'s replicate project onto, reason on 50% of them touchscreen doesn't register touches. screen displays fine, no touch.

what's weird when watching logic on spi io pins, appear identical. touch interrupt pin firing correctly , there's back-and-forth on spi coms touchscreen fine, nothing happens in x. tscalibrate doesn't register either.

there seems no rhyme or reason why 1 pi works , other doesn't, it's consistent. if works on pi work, if doesn't, wont. come element 14, same revision.

ideas?

im noobie gotta ask. using cloned sd image or fresh install , setup on each pi ?

sd card working pi setup produce same result in non working setup ?

if using sd cloned image, image contain conditional filters ?

such listed on https://www.raspberrypi.org/documentati ... fig-txt.md
scroll bottom , see info conditional filters ^_^

hope helps define question bettera!

if you're running multiple pis multiple screens i'd suggest checking batch numbers on screens, never know ahve recieved bunch of bad screens. after thought!

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