What happened: I was carrying my stm32 f401re inside a bag, and there was a little droplets of water inside the bag, when I removed the bag the MCU was wet, I wiped it gently on my clothes before connecting it to the PC, and it worked with LEDs and the buttons.
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3\$\begingroup\$ PCBs are often literally washed in a water-based solution, so getting it wet is no problem. Just have it dry properly before you'll be using it. Leave it for a day in the back of a car sitting in the sun, for example. \$\endgroup\$– Kuba hasn't forgotten MonicaCommented Jun 10, 2022 at 18:47
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\$\begingroup\$ Great thanks for the relief, I tried before asking this question And it worked properly but I was afraid that some of pins are not, as I am a beginner and still learning how to use them. \$\endgroup\$– Mustafa IssaCommented Jun 10, 2022 at 18:49
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Where I work, I design and build circuitboards, usually based on MCUs. When I finish a batch of boards I put them into a literal dish-washer.
Like this:
As long as they are dry before applying power, no problem at all. Circuitboards and ICs are made to be washed.
If it works, it works. I wouldn't bother trying to test the pins individually.
answered Jun 10, 2022 at 19:26
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\$\begingroup\$ Upper or lower tray? With heated dry or without? :) \$\endgroup\$ Commented Jun 10, 2022 at 20:28
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1\$\begingroup\$ @EugeneSh. Both upper and lower trays. For production: No heated drying, they get a diH2O rinse then go into a special dryer we made that pumps filtered air @ 40C through the chamber. Prototypes get the heated drying and no diH2O rinse, if I bother to wash them at all (depends on what the board does). \$\endgroup\$ Commented Jun 10, 2022 at 20:48