Apple MBP 15" 2012 820-3330-B Defekt GPU

[Roman78]

I got a 2012 MBP non retina over here with a defective GPU. So what i did is almost the same as on the 2011 models and disabled the dedicate GPU, but the display stays black.

I entered the following in the terminal:

sudo nvram boot-args=”nv_disable=1″

and

sudo nvram fa4ce28d-b62f-4c99-9cc3-6815686e30f9:gpu-power-prefs=%01%00%00%00

and removed a Resistor for powering the U8900. I did this successfully on another 2012 MBP and documented this here: https://www.die-oswalds.de/blog/2019...r-grafikkarte/

But this one stays black. The MBP turns on and i can remotely to this one and also use an external GPU, both works. But the Display just wont turn on. When i on the device i can see the dedicated GPU is turned off, i only see the inter from the CPU. What could i do now?

[piernov]

Re: Apple MBP 15" 2012 820-3330-B Defekt GPU

How did you diagnose this machine has a dead GPU? Those rarely die.

[ktmmotocross]

Re: Apple MBP 15" 2012 820-3330-B Defekt GPU

not rarely. i reballed some of these because of no display. even cpu have bad balls, so one of memory module dont work

[Roman78]

Re: Apple MBP 15" 2012 820-3330-B Defekt GPU

Well, they don't die as much as those 2011, but they die sometimes. It had the typical symptoms. This is the second 2012 non retina i got here with a defective GPU.