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A1502 display goes black after login

B

BCN_Techs

Member
Hi,

Got this macbook A1502 2015. It starts normally load MacOS but when put password display goes black. Already tried to boot from external macos, safe mode and same is happening. Any idea?
 
R

raainxx

Member
Do you arrive to boot on a external good system?
Do you have the cursor? if yes.
you can try that in single user mode (CMD+S):

/sbin/fsck -fy

/sbin/mount -uaw

rm /Library/Preferences/com.apple.loginwindow.plist

rm /private/var/db/.AppleUpgrade

reboot
 
B

BCN_Techs

Member
it's only booting in safe mode. So we can discard BIOS?? What can make macbook stuck in normal mode but work in safe?
 
2informaticos

2informaticos

Administrator
Staff member
Did you try external SSD through USB, disconnecting internal one?
You should have an USB test OSX.

Try PRAM reset.
Clean ME, if no change...
 
B

BCN_Techs

Member
Well, it's not EFI, it's not even logic board. I have exactly same macbook and excahgned the board from mine (working) with customer (stucking). after a minute my board stopped working in customers macbook case. One by one i checked all external connections and finally it's display or display cable blocking system.


How is that possible?
 
B

BCN_Techs

Member
And even if there is way display can block computer ( its not connection loose because it stop recognize HDMI, why in safe mode it doesnt happen?
 
B

BCN_Techs

Member
Yeah, i Know but, it's has nothing to do with LCD cable, right?


Finally changed it and it's working for 20 minutes already without issues.
 
2informaticos

2informaticos

Administrator
Staff member
Retina display has a dedicated I2C bus for backlight control.
I can only suppose the video cable blocked somehow the communication; because of leakage maybe.
 
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