My guess is that the 3 pin package is an NPN transistor, type S8050 with "J3Y" marking, with the base connected to one set of traces. One or the other of the parts should be a high value resistor, but I can't make out the markings.
You could easily verify or disprove that with a multimeter. Only $0.29 at AliExpress!
Guess at the circuit, from the description on the "best data sheet" (water on the traces effectively shorts the base to ground, cutting off the transistor):
