I have serviced the MBP with the typical symptoms of AMD GPU damage. I made a change to EFI according to this description:
forums.macrumors.com
Then I desoldered the R8911 resistor that turned on the DC / DC converter that powers the AMD GPU. I also made a connection between the two resistors to fix the wake-up problem in High Sierra .. Everything is described here:
realmacmods.com
MBP works, it starts every time, it looks good. Only the integrated Intel HD Graphics 3000 (512) is displayed in the configuration.
However, I can see changed colors (excess blue color) and defective display of images, especially smooth color transitions, here are such areas (as if the graphics card did not work with the appropriate color resolution).
MBP is much cooler in El Capitain. In this system, pressing F1 / F2 displays the color adjustment bar (and even works the slider), but does not change the brightness of the screen. The screen is too bright, sometimes you can see slight noise in the projected image (a kind of slight graphic noise).
In High Sierra, the computer is much warmer and pressing F1 / F2 has no reaction. The screen is also too bright and too blue. In general, the visual symptoms are the same.
I wonder if it is a software configuration or do I need to replace the LCD LVDS cable. During the disassembly, I examined it carefully and the plug from the motherboard side is slightly damaged (as in the photo). Is there documentation of this cable and signals on individual pins of the plugs?
Force 2011 MacBook Pro 8,2 with failed AMD GPU to ALWAYS use Intel integrated GPU (EFI variable fix)
If you don't have time to read my story (which also describes some interesting technical approaches) just scroll down this thread until a "100% WORKING SOLUTION" text Discrete AMD GPU of my 2011 MacBook Pro 8,2 has finally failed because of the reasons mentioned here (...
forums.macrumors.com
Then I desoldered the R8911 resistor that turned on the DC / DC converter that powers the AMD GPU. I also made a connection between the two resistors to fix the wake-up problem in High Sierra .. Everything is described here:
Macbook 2011 Radeon GPU Disable - Real Radeongate Solution.
Here we will show you a simple method we have developed to completely and totally disable your defective AMD Radeon GPU. Permanent and Cheap Fix.
MBP works, it starts every time, it looks good. Only the integrated Intel HD Graphics 3000 (512) is displayed in the configuration.
However, I can see changed colors (excess blue color) and defective display of images, especially smooth color transitions, here are such areas (as if the graphics card did not work with the appropriate color resolution).
MBP is much cooler in El Capitain. In this system, pressing F1 / F2 displays the color adjustment bar (and even works the slider), but does not change the brightness of the screen. The screen is too bright, sometimes you can see slight noise in the projected image (a kind of slight graphic noise).
In High Sierra, the computer is much warmer and pressing F1 / F2 has no reaction. The screen is also too bright and too blue. In general, the visual symptoms are the same.
I wonder if it is a software configuration or do I need to replace the LCD LVDS cable. During the disassembly, I examined it carefully and the plug from the motherboard side is slightly damaged (as in the photo). Is there documentation of this cable and signals on individual pins of the plugs?