There isn't really any way (that I know of) to check the IR sensors. It's invisible.
The optics in the bezel (the black shiny plastic which is translucent) well, you could use a flashlight and see if there's light I guess
not sure what to expect there, never did it myself.
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Well, can't turn it off in the setting, because .... you know.
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You could edit the .kobo/ Ereader settings file directly. But that alone won't fix a broken touchscreen...
Some time ago I posted an illustration of how I believe the IR touchscreen works in another thread:
https://www.mobileread.com/forums/sho...80#post3120480
For you, if it's not the emitter/sensor itself, it has to be obstructed somewhere along the way.