Won't power on. Fan on for a 2 seconds and turns off, repeats

My MacBook Pro mid 2014 13” was all working and all of a sudden yesterday it turned off.

Things I did to check before opening my Mac:

• Shutdown my Mac by pressing power button for 10 seconds, and turned ON - tried resetting PRAM.
• Similarly tried resetting SMC.

Result: Nothing happened no chime or display.

So opened it and disconnected the battery tried with just main plug still same results.

But! I noticed that, when power button is pressed, fan spins for 2-3 seconds and stops and repeats. Then the CPU, SSD gets hot. I then removed the battery and power supply.

Last try, I disconnected SSD, side WIFI board and turned on, still same result.

If it is a logic board issue, anyone know which part failed it would be helpful.

If anyone recognize this problem, please help.

Thanks