A2779 820-02841-A black screen but not in recovery

T

thomamagic

Member

Oct 30, 2025

• #21

for info JR200 without connect :
pin 1 : 1.8V
pin 2 : 1.8V
pin 3 : 0V
pin 9 : 1.8V
pin 2 : 3.3V
pin 4 : 1.8V
pin 8 : 0V
pin 12 : 0V

 

2informaticos

Administrator

Staff member

Oct 30, 2025

• #22

Test external video disconnecting internal LCD.
You should get the main screen.

3V3_S2 is present?

 

T

thomamagic

Member

Oct 30, 2025

• #23

That's precisely what's strange; with the screen disconnected, I don't have the main session display but the second screen of the extended display.

PP3V3_S2 is present and get 3.2V

 

2informaticos

Administrator

Staff member

Oct 31, 2025

• #24

Try using Command + F1 (+ Fn).

 

B

BGTR

New member

Dec 26, 2025

• #25

Hi, were you able to find a solution? I have the exact same problem with the same motherboard model. The screen goes black after the Apple logo appears and the loading bar starts. But when I boot into recovery mode, the screen works correctly.

 

2informaticos

Administrator

Staff member

Dec 26, 2025

• #26

First of all, welcome to the forum!

Please open new thread with your problem.
Not always same symptom has the same solution.
Don't forget to mention fault history also.