Macbook A1398 820 3332 (mid 2012)GPU fried?

[marce002]

Hello

Laptop is Macbook A1398 820 3332 (mid 2012), winder if GPU is fried? chimes ok, and fans spins... no image + no hdmi output.... problem seems to be GPU because L8930 to ground does show 0.9ohm, too low , and read should be about 18ohm.... i have lift coil L8930 to see if short is in the GPU side and it is... the other coil L8960 shows also a short to ground, and also connected to the GPU..
My question would it be, can I do something at this stage? mabe make it work under internal intel graphics? any other idea?

thanks in advance

[mon2]

Re: Macbook A1398 820 3332 (mid 2012)GPU fried?

With these coils in place, power on and post the voltages at each of these coils.

[piernov]

Re: Macbook A1398 820 3332 (mid 2012)GPU fried?

U8900 solder joint defect can kill the GPU. Or someone already tried to fix the board and killed it.
You can try to disable the dGPU and force the iGPU.

[marce002]

Re: Macbook A1398 820 3332 (mid 2012)GPU fried?

Thanks. Done it today... GPU was fried , removed both coils and short is clear comes from inside the GPU chip.... converted to UMA now installing mac os.. thanks to both mom2 and piernov....