Creality CR 10S Heat bed not working

[flyingdragon]

Hi everybody,
I need help because one day I wanted to print but my bed temperature was not mowing up.
So I started by checking my thermistor and it is working
Then I was not sure if my connection cable to the bed was okay, so I changed it to a new one and connected directly to the mosfet end power supply.
Then I decided to exclude mosfet and connect directly. And it worked Yee succes!!!!. I bought a new mosfet, changed it and it didn't work.
I found a video on YT where the man said that he changed plus and minus cables from the mosfet to the main board. Didn't work either
Is this a sign that the main board is finished and does not send a signal to the mosfet?
Is there something else I miss? Everything else is working properly.

[LePaul]

Sounds like a defective MOSFET? Where did you get it? Amazon or?
I usually go direct to Tiny Machines for Creality parts