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Retina MacBook Pro 15" (Late 2013, 820-3787) random GPU related shutdowns

J

jpc

New member
No, no error reports, kernel panics or anything else in the logs. I get a blank screen and a shut down after a few seconds. Sometimes it gets stuck with the the blank screen and fans blowing for longer. Either way I have to press the power button to get it to start again.

When I am connected via HDMI the display shows the image instead of a blank screen. It may be that only backlight turns of on the internal screen while the image remains. I will try to verify this later.

I start to suspect that I don't have to load the Nvidia GPU specifically. Yesterday I tried to run the GpuTest on the Iris Pro and also seemed to prevent the shutdowns. I will test this further and also try loading only the CPU with prime sieve or something like that.
 
J

jpc

New member
Ok, I verified that the hanging has nothing to do with the Nvidia and everything to do with the CPU. I am running Prime95 for 2 days now and Nvidia is completely powered down. While I was running GPUTest I would render something very simple with lots of FPS and this would also load the CPU a lot.

So I guess I should focus on the CPU power supply. Does anybody have any tips to share?
 
D

dukefawks

Administrator
Nope, I have not figured out this issue with 3662 and 3787 boards yet. Resolder U9300 first to rule that out.
 
D

dukefawks

Administrator
Possible fix is to replace the CPU FETs. Seems to work no returns yet. Get them new though, don't pull them off donors.
 
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