Ender 3 motherboard burned out

dembrovszHello Everyone!I need somebody's help! I have an Ender 3. After 1 year, my motherboard (merlin V 4.2.2) got killed. I think the processor burned out. The screen just blue and the processors and all the chips are hot af. I changed it to another motherboard (V 4.2.7). After 1DAY it is burned out too. Blue screen, hot chips. Cooling fan was on all the time to cool, but it doesn't work.Also one of the stepper motor has a weird noise.We measured the power supply unit with a multimeter but it was good. So nothing with the power.I wander if any of you run into some problem like this. I do not want to buy another motherboard until it is fixed.Can somedody help me with this topic?Thank you and Best Regards:Benjamin