macbook A1706 820-00239

[ipetro]

Hello ! The system installs but cannot boot and the screen of death appears.

 

[2informaticos]

Can you boot USB macOS?

 

[ipetro]

THE SAME PROBLEM FROM AN EXTERNAL DISK! I think the problem is with the BIOS!

 

[ipetro]

Can I ask you for a diagram and boardview for a board with this chip?

 

[2informaticos]

That is 00840 board; no schematic/boardview available.
We only have 00875 for A1708 model.

However, the same redriver chip is used on A1989 (00850); in case you want make an idea about its function.

 

[ipetro]

I'm sorry, I wrote this in the wrong topic for Mac A1708

 

[ipetro]

Now let's go back to this board and it won't start from either the internal or external drive

 

[ipetro]

I think the problem is in the BIOS! how do you think ? could you help me with a BIOS with a clean region for this board?

 

[2informaticos]

Did you test in safe mode?

 

[ipetro]

yes the macbook works in safe mode

 

[ipetro]

and even after pressing the power button, the system starts to boot after 27 seconds, which is a very long time

 

[2informaticos]

A1706 820-00239-09 - clean.bin

drive.google.com

Let me know if this helps...

 

[ipetro]

MacBook won't turn on with this bios

 

[2informaticos]

badcaps working - A1706 820-00239-09 - clean + fix.bin

drive.google.com

Try this one...

 

[ipetro]

Unfortunately, with this the BIOS does not turn on either, this is strange, maybe I’m wrong in thinking that the BIOS is to blame!

 

[2informaticos]

Try again original BIOS...

 

[ipetro]

I returned the old BIOS, but the Mac did not start. I decided to change the case and I am confused because the motherboard successfully booted and is working in a different case! (maybe a problem with the keyboard or touchpad). but the fingerprint doesn’t work even though I transferred it from my original case!

 

[2informaticos]

Check the circuits from page 47.