Hello Gunther,

Thank you for quick response. I had same idea regarding external screen protection. And it is why I remover a little bit in position 1, but sensor working well in position two (without protection) and position 3 (with it). But it is not working in position 1 with removed cover(see pic). And there is no any covers inside of samp

may be some thing wrong with sensor?

thank you.
Vadim