My Samsung DV419AEW/XAA dryer won’t power on at all after I pressed the power on button (no noises or lighting). Here are the things that I checked so far:
1)Checked the outlet, got 240V and 120V on each leg to ground. So power was ok.
2)Check the power coming in to dryer and they are ok as well
3)Measure the resistance on Thermostat 1, Theremostat 2, and Theremostat 3, they all have less than 1 ohm (within spec as Samsung recommended)
4)Checked the Heater resistance approx. 10 ohms (in spec)
5)Checked the thermistor at 77 degree in the house at the time, the value is 9.3K Ohms (speck is 10K)
6)Checked the door switch and they was ok
7)Inspected the main control board and sub board didn’t see any burns or marks in them, don't know how to check if the board is still good or not, any advices?

I replaced the main control board and this didn't solve the problem. At to this point I don’t know what might have contributed to the power problem. Could someone give me some advices on what to do next? Thank you for your help!