Hello everyone,
I would like to kindy ask for help. The problem is I tried this modification (with wiring to be precise) and failed twice.
If someone could help and tell me what could possibly go wrong I'll appreciate every single response form you.
Problem is I tried wiring the gMux on A1286 15" board. I have read the instruction and begin to solder the wires. I used thin circa 1 mm diameter wire from pulse transformer and while I was soldering I have used board heater set to preheat my board to 60°C. On finish I've double checked every single line if it's soldered correctly.
Everything looked fine so I installed the board and tried to boot the system. When I realised that there is no OS on my drive I have to boot macbook with Command (⌘) and R pressed.
For a bit of time I could use my device with no problems but after about 2 minutes the sceen started to flicker only to turn into white screen. When I tried to reset the system there was no picture at all. Only full bright backlight (white screen).
I fought that my preheater damaged PCH. Is it possible that rising temperature of a board may damage PCH?
After first fail I decided to wire second identical board which has the same problems with dGPU.
This time I've not used my preheater to rise the temperature of the board for better soldering. The same thin wire from transformer. Again after work, double checked the wires and installed the board.
After a few minutes of working I had the same problems! Screen starts to flicker only to lose display. This time I menaged to notice that pressing down in the location where USB ports are, macbook stopped losing the display.
What gives? Is it possible that on my two boards, both PCH have bad solders/are damaged? I have no idea what to do.
This is my first post, I hope there is no problem to continue this thread. Also sorry for my english, I'm from Poland by the way
I attached videos showing problem with first board and second board when I show what is happening when I press the USB device a little more. Thanks in advance.