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Macbook Pro A2141 820-01700

2informaticos

2informaticos

Administrator
Staff member
First of all, welcome to the forum!

Don't expect iGPU voltage (PPVCCGT_S0_CPU) until Intel graphics gets high load.
What is the CPU core voltage (PPVCC_S0_CPU), after 10-20s?

"The display isn't turning on"
So do you get image on internal LCD?
 
2informaticos

2informaticos

Administrator
Staff member
Right, I don't know why I have read "is", instead of "isn't"...

0.9V means the board doesn't really boots just stays on.

Try first DFU revive; restore, if no data to save.
 
T

tselectronics

New member
2informaticos said:
Right, I don't know why I have read "is", instead of "isn't"...

0.9V means the board doesn't really boots just stays on.

Try first DFU revive; restore, if no data to save.
Click to expand...
How do I do DFU revive without knowing what OS was present on the Macbook? Can I do DFU revive without needing second Macbook? Slight clarification would be greatly appreciated.
 
2informaticos

2informaticos

Administrator
Staff member
Normally no need to use exact same macOS in the host (AC2) machine.
Anyway, if think that can prevent DFU to complete, you can try DFU with more macOS versions in the host MacBook.
Using USB versions, like Mojave, Catalina, Big Sur.
Just be sure to use the dedicated DFU port on the target machine.

Read this thread for more information and follow the steps from the linked tutorial.

HOW TO collection

I hope this "How to" collection will help our members. I will possibly modify this post in time, if updates available. Trigger SMC_ONOFF_L (PMU_ONOFF_L): It reffers to simulate power button function, when the keyboard is not connected. We need to do this when we work with the board...
boards.rossmanngroup.com boards.rossmanngroup.com

Do not quote an entire post, visible few centimeters above.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

tselectronics

New member
Sorry about the quote.

I tried DFU mode (Host is M1 Macbook Air 2020). It starts installing and then with no error just stops and gives me a Lock Icon. Nothing more.

Any further assistance? I am desparate at this point.
 
2informaticos

2informaticos

Administrator
Staff member
Padlock sign at the end denotes DFU completed without errors.

CPU core voltage, still stuck on 0.9V?
It should drop at 0.6V aprox when machine really boots (after 10-15s).
 
T

tselectronics

New member
CPU core voltage is still 0.9V. Interesting observation is that the fans start accelerating towards approx. 100% after 20-30 seconds.
 
T

tselectronics

New member
No image on external monitor, even after disconnecting the internal LCD, tried good trackpad, nothing...

Macbook turns on by itself (can't even shut it down without it starting immediately after), fans go to 100% after a while, that's it for now.
 
2informaticos

2informaticos

Administrator
Staff member
Then fans issue is not caused by camera/ALS.
Probably trackpad board/flex problem.
But that shouldn't prevent video to appear.

Possibly bad CPU...
 
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