How do I wipe a Mac whose Find My is turned off?

Is there any way to wipe a MacBook Air that has Find My Mac disabled? The issue is that my MacBook Air 2018 was showing a symbol X since May’23 after Ventura 13.4 upgrade meaning that the battery needs replacement and was running very slowly with the processor showing 80 % capacity utilisation without any load.Interestingly though diagnostics did not report any issue. The camera stopped working after upgrading to Ventura earlier. I did some trouble shooting with Mac support and the local Mac book authorised support guys and they advised that the battery needs to be replaced. Which I did. Now after doing that within a weeks time the system stopped charging and now would not start. The support centre is telling that the logic board needs replacement, which does not make sense to me. Now in MacBook Air the ssd is soldered with the board. I want to ensure that the memory is wiped clean before replacement. Better still is there any way to make sure that the logic board has actually failed?