Missing manual for Replacing GPU
First of all, thanks to iFixit for all the information of replacing and repairing hardware. But i’m missing a Manual for replacing the GPU for the iMac12.2.
We don’t have a Mid 2011 iMac GPU board guide. But this guide will get you mostly there 安装iMac Intel 27" EMC 2429 双驱动器组件(机械硬盘或固态硬盘) Follow it to Step 33. Finish removing the logic board out noting the cables you still need to disconnect from the backside. With the logic board out you can then remove the GPU and its heat sink.
Do make sure you apply a fresh coat of thermal paste on the GPU and replace the thermal pads on the V-RAM chips. Don’t use thermal paste on them as you need a special gapping paste which is not as good as the pads.
@roman78 - With the system back together what does the onboard diagnostic LED’s telling you? Locate in the upper right corner the LED’s
Here's a breakdown of the onboard diagnostic LED's:
So what did you see?
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After step 33 will the logic board and gpu come free away far enough to use a screw driver or do you need a small socket?
@Josh Vamos - To clarify: I fully remove the logic board from the case and with the logic board on my desk I finish removing the GPU board as well as remove both heatsinks.
Thank you Dan, I now have the whole board on my desk. Appreciate the quick clarification!
Still a black screen after replacing. Not sure how to diagnose correctly. connections all seem fine. The motherboard PSU seems fine. What other failures can lead to a black screen?
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