IR sensor of some kind? How does it work?
But the black things are a puzzle - light sensitive transistor is supposed to have two legs not three. Two transistors or diodes in one package? And I get no reading with multimeter - no resistance nor diode polarity between any combination of the legs. Tested both of them. (They have to be really heat sensitive for both to be broken after my desoldering.) And there is no component number on any of them.
Does anyone know, what exactly are the three leged components?
And can they be still in working order despite the no reading on multimeter?