macbook air 2020 A2179 boot loop cpu hot

[dellxps15]

hi all, got this macbook that looks perfectly clean. no visible liquid damage or burned component that boot loop. if i try to enter diagnostic , it reboot too after a while.

owner want to recover data, so im asking if i try a dfu (dunno ifi can do it in that model) do i loose all data ?

what can cause cpu to get very hot from the beginning ?

generally i fixed some boot loop by reprogram bios, of do a ssd SOS task from recovery menu, but before i start doing things, it's better listen to someone that had this problem on that model

[dellxps15]

Re: macbook air 2020 A2179 boot loop cpu hot

hi, today i tried a dfu reactivation, but while he is working after a while the macbook restart and goes in boot loop again.

[dellxps15]

Re: macbook air 2020 A2179 boot loop cpu hot

still didnt find a solution to this. i wont replace component just to see some improvement.
i noticed that without battery, once it start and u power it off it draw 0,03 0,04 ampere.
12,6 volt stable, 3,3 and 5 volt stable too.

when it boot loop, ppbus oscillate from 12,6 to 12,3 volt. also cpu get extremely hot, but a bad cpu will not make macbook stay on if i go into recovery mode and i dont put wifi password.

[dellxps15]

Re: macbook air 2020 A2179 boot loop cpu hot

update: problem fixed: i did some reactivate through dfu 3-4 times and didnt work. owner wanted to get data back but unfortunatelly it wont reactivate whatever i did.

after owner told me i can reset the mac, i did a restore through dfu and got error, then i did a reactivate and got error but after i restarted mac i got the folder question mark, so i reinstalled osx with command option r keys and mac went back to normal working.

[conghuyms]

In the MacBook Air 2020 model, this type of error is often caused by the CPU. Try removing the CPU and reflowing — that might solve the problem.