Hello. Maybe someone here could help me troubleshooting. This is a control of a dehumidifier. So, if machine is plugged in 230V, speaker on board makes a beep and It wont turn on, nothing works. I tested power regulator (third picture), its 7805C, input 18V, output 5V, fourth picture is datasheet for that regulator. Fifth picture is transformer, couldnt find datasheet for that, but it clearly says 12V, is that a problem? I guess not. What could I look for next? Fuse is OK. Curious to solve problem myself and learn something, thank you for your time in advance.

 

Hi,
Have you checked for corrosion on the components, like R14 & R8 etc in second picture.
18v into 5v regr. does seem high.
Good luck............