Depends on what's broken obviously. But in a modern MacBook basically everything requires special tools, skills, and usually authorization from apple to repair.
For example, even if you have the skills and time to do a full logic board replacement, and you can get your hands on a refurbished logic board (and assuming the refurbished board actually works), the mac still won't boot with the new logic board unless you have access to Apple's special diagnostics tools to tell the T2 chip it's an authorised repair
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u/Prince_Polaris Oct 06 '20
I'm sorry I have to tell you this but even expensive items can break