820-3332-a wont boot to os

[andrew boren]

original board had no lcd enable, replaced with new board, and it wont boot to the os. it shows the folder icon, 'so the lcd was good like i originally thought" the problem is even with a working os it wont boot to it, it will boot to a usb os, but takes 10-15 min to get in, even to boot to the os install media takes 5-10 min. ran apple diag and it passed on extended. i have no idea what could cause this kind of issue, ssd does get read in the disk management, and i formatted it and reinstalled. but no change.

 

[2informaticos]

These boards are known for U8900 issue, but seems that is not your case.
Looks more like ME issue; reflash BIOS with clean ME.

BTW, reflow/resolder U8900, just in case.

 

[andrew boren]

i have never flashed a bios, how would i go about doing that? is there a video or a site for me to learn?

 

[2informaticos]

Oops, I supposed you don't have programmer.
If you plan to stay in business with Apple stuff, get Medusa 2.
Google can bring you a lot of info about BIOS programming...

 

[andrew boren]

ok i see how that tool works, but at the moment i wont be able to get that tool, do you know if anyone does it for a fee and if so how much?

 

[2informaticos]

You must find someone in your area.
Ask in few service places and choose the best option...

 

[andrew boren]

there is no one nearby im from kansas

 

[2informaticos]

You can buy a cheap BIOS programmer, if you do not repair laptops diary.
Even CH341 should do the job...

 

[Bouba148]

Honnestly as 2Informaticos said higher in the Post : buy a Medusa 2 box from Harald (http://www.cmizapper.com/products/medusa-2.html).
you'll see it worth it:
it will save you a lot of time and do many tasks easily

 

[Alan.L]

buy a TL866 Mini Pro programmer. they are inexpensive and very easy to use. works on all kind of laptop's bios chip. Louis Rossmann has a guide on this.

 

[Bouba148]

Very good suggestion Alan, this is exactly what I've got: both TL866 + Medusa 2

 

[2informaticos]

Good choice.
Because I forgot to mention, Medusa 2 requires a normal programmer to interface it with your service pc...