How to make the board work without a switch?

Question

Electronics

Hello!
I purchased a humidifier, which, after connecting the power, turns on only by pressing the power button.
Task: to make the humidifier start working immediately after connecting it to the power supply. That is, without pressing a button.
Unfortunately, searching in google did not help to solve the problem and I was forced to use the last chance - the community of specialists.
Photo of the board itself:

I tried to unsolder the button and draw the tracks directly (as you understand, I don’t understand anything in circuitry).
I will be glad to advice. Thank you!

Answer 1

You can google a single vibrator waiting for a multivibrator. https://vpayaem.ru/information18.html
You can google the pulse shaper (with dry contact).

Answer 2

1) Check whether the device will turn on when the button is constantly pressed, if yes, then simply close the button with a jumper.
2) If the first option does not work - put an RC chain - a resistor and a capacitor in series (it is possible that there is already a pull-up resistor there and one capacitor is enough). Connect it all parallel to the button. If it doesn't work, swap the resistor and capacitor. The value of the capacitor is about a thousand microfarads and the voltage is 1.5 times greater than the supply voltage. The resistor value is about 1 kilo ohm. The product R * C - the turn-on delay time, will be on the order of a millisecond.