A1707 20v 1.26a - No Display

[Shantiche]

MacBook Pro brought in by customer. Fan spins and it gives 20v 1.33a - 7a
no chime no display what can it be?

 

[2informaticos]

Any history available?
Can we know what exact board do you have?

 

[Shantiche]

History - It never came back on after an Update
820-00281-A not sure what steps to take first.
Currently giving 19.7v 3.00a

 

[2informaticos]

Update failure points to BIOS issue.

820-00281 clean ME GTFL MLH32D.BIN

drive.google.com

A1707 820-00281 clean ME.bin

drive.google.com

Let me know if any works...

 

[Shantiche]

transferred file1 to flash drive and plugged into the macbook but still got the same symptoms however its now 19v 4.24a
transferred file2 to flash drive - no new results - 19v 1.67a

 

[2informaticos]

What you means "transfered file to flash drive"?
You must desolder SPI chip and flash it with USB programmer.
Or do it onboard with Medusa, if availble.

 

[Shantiche]

I’m a beginner. You gave no instructions. But Okay will do more research

 

[2informaticos]

I suspect you don't have Medusa programmer.
So you need to desolder the chip (U6100) and flash it externally.
The cheap CH341 can do it, with an WSON8-DIP8 adapter.
Don't forget to make a backup first.