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Model A1311 / Mid 2011 / 2.5 & 2.7 GHz Core i5 or 2.8 GHz Core i7 Processor

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GPU heatsink black or burned

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I opened up my imac to see why it was not powering on. When I disassembled the heatsinks, I found that the GPU heatsink is black from under. Does it mean that the GPU is burned out is the reason for it not turning on whatsoever.

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That is a tell-tale sign the GPU chip has failed (shorted)

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Also I found that a few pins in the cpu socket were SLIGHTLY bent, so i aligned them back . Is it okay?


So the CPU was also bad? Be very careful! as this pins are like a bent paper clip one to many bends it snaps! One bend is about it before it goes.

Sadly, once the socket is gone that's the end of the logic board.


@danj So, if I bake the gpu at 200 degree celcius, could it revive the shorted GPU?


@btwtg - Cooking your GPU after it has shorted out won't fix it. As they say you can't un-break an egg.


@danj I've tested the PSU and it reads 12 V and 5.5V with diagnostic led #1 on.

I've even baked the GPU but it didn't help. CPU socket and CPU are fine with no missing/damaged resistors. So, do you think the problem is in the Logic Board or GPU. It would be very helpful if you can give me the schematics for this model.



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BTW TECH will be eternally grateful.
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