820-3024 u6100 shorted.

[Yoel Ren]

hi, this board came in with mild liquid damage around u5510.
its quarter fan spinning.
even after clean and replace u5510 still quarter spinning.
then with thermal cam i found that pp3v3_s5 is shorted at u6100.
removing u6100 relieve the short.
anyone have the bios clean file for this board ? can't seem to find the file on other forum without paying for membership..

 

[2informaticos]

820-3023 should works in this case.
Try this file, as is.

820-3023 clean fix APFS.bin

drive.google.com

Here is an 820-3024 file, no clean!
I didn't have time to clean it; can do it yourself, with Medusa, or UEFITool and Intel FIT.

820-3024-B macbook air.BIN

drive.google.com

 

[Yoel Ren]

i tried first file, its not quarter fan spinning anymore, but still no usb activity.
i tried the second file, and clean me with medusa. its not quarter fan spinning, but i get fan spin that start normal, and later will blow faster.
no usb activity, i got 1.1v at ppvcore_s0_cpu..
my brain just shut off wanting to point out pch or ram problem on this 2011 macbook haha

 

[2informaticos]

Fan will spin faster if you test the board alone on the desk.
Trackpad is required, as it has some temp sensors.

 

[Yoel Ren]

ok.. but still no usb activity, so i dont need trackpad too test right..
i tried to reflow each ram, but still no avail..

 

[2informaticos]

Beeps RAM error code, if connect the onboard speaker and LIO board?

 

[Yoel Ren]

theres no beeping sound, i use the charging port + the cable bridge too.

 

[2informaticos]

Probably bad PCH, or CPU...