Macbook air 820-00165 after CPU replacement. Funny problem.

[czechrepair]

Hello guys, I am working on a Macbook air 2017 Logic board 820-00165 with 1.8Ghz cpu.

The board came with Vcore shorted. I decided to replaced the CPU (cpu taken from other board) and the board boot, see wifi, but will not boot into MacOS or boot in Recovery. It start to load then turn off.

However, The laptop boot up fine in Ubuntu and works nicely. I can run and complete Ubuntu on the local disk.

I decided to replaced the CPU again (taken from donors board) and same problem

I have also replaced CPU from a 820-00840 and it has same problem.

It seems apple don't want us to replaced CPU.

I have no ideas what the problem now.

Both laptop work very well with Ubuntu.

Sebastien

 

[2informaticos]

First of all, welcome to the forum!

Clean ME region in BIOS...

 

[czechrepair]

First of all, welcome to the forum!

Clean ME region in BIOS...

Hello,

Thanks.

I have done ME region and NVRAM reset.

It start with apple logo, show progress bar then after 2min there nothing on the display, only backlight is on and it turn off. (during all this process power supply showing 540 - 600 amps.

Of course Ubuntu boot in 55 seconds

Sebastien

 

[czechrepair]

I tried to boot MacOS in verbose mode. It seems to complete the boot up process and this time it get stuck in blank display with backlight on. It doesn't shutdown.

 

[2informaticos]

How did you clean ME region?

 

[czechrepair]

we use a tool called LBE ++ see attached.

 

[2informaticos]

Puah...
Upload somewhere original BIOS.

BTW, we have CONFIRMED clean ME BIOSes posted on the forum, for this board.

 

[czechrepair]

attached bios for reference.

we never had me region issues. But i will try to get the confirmed on the forum and try.

attached original and changeme bios we have used.

https://file.io/9vWJRAKghhw5

 

[czechrepair]

I am not able to find confirmed me region on this forum. Maybe someone could post me a link. thanks in advanced.

 

[2informaticos]

Try this as is, just for test; do not change serial number.

2017 - J1WK clean ME - working - 1.8Ghz_8GB.rar

drive.google.com

 

[czechrepair]

okie will do thx.

Try this as is, just for test; do not change serial number.

2017 - J1WK clean ME - working - 1.8Ghz_8GB.rar

drive.google.com

thanks. i will try today.

 

[2informaticos]

Do not quote an entire post, visible few centimeters above.
Please, maintain forum aesthetic...

 

[czechrepair]

ya

 

[czechrepair]

I flashed the bios you send me. When I boot via usb, It show apple logo and progress bar seems to complete then blank screen, only backlight work. It will stay in blank screen forever . It doesn't shutdown this time. Cap lock not work.

 

[2informaticos]

You've uploaded two files.
Is any the original, read from your board???
I didn't ask for modified BIOS.

 

[czechrepair]

sorry for that. here the original one.

https://file.io/ZR6rOpXsQSrN

 

[czechrepair]

Regarding 840-00840-A that I mentioned in my first post.

After CPU replacement, I flash this attached bios and it will get stuck on apple progress bar. If I boot in safe mode. It boot completely.

When I login on MacOS. I get this message about IGPU. See attached

Maybe graphic is not working correctly. I have no ideas

Even with clean ME region it does same.

https://file.io/oalI8GkSe0G2

 

[2informaticos]

Please, don't mix the problems here.
Open new thread with any board.
Which board needs BIOS clean ME now???