Has anyone successfully fixed the random shutting on/off issue?

I discovered how to open the body and remove and replace parts on my MacBook Pro.  Laptop is cursed with the common “random shutting on and off” defect. The charger cable is good. Successfully charges this Mac and others. Has anyone succeeded in repairing this all to common issue? How did you do it? What part(s) do I need to fix mine too?

BTW I am happy to share how to open the body for anyone who wants to know.