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After recently replacing my GPU card and chip, I ran Apple Service Diagnostic 3S123 and discovered I have an error that states: Thermal Interface -Video Controller:G92gt (test #4) -TIM Test 75 percent Gardband-Check that CPU heatsink is properly attached, using product spec theta dh + 75 percent guard band.
Any suggestions on how to fix that? I can't find anything online about it. I don't even know where to look on my machine for that item.
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When you replaced the card and GPU did you use thermal paste? I'd also contact Brickfence and ask them the same question since they did the repair.
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I am using thermal paste and just replied it to the CPU portion again after the error/fail notice. After I reapplied it I got the same error message. Now I am wondering if it is the quality of thermal paste I'm using. I just emailed Brickfence too see what he suggest. Thanks for the suggestion and your prompt responses! I really appreciate it.
I've seen these types of error when the wrong screws are used (or missing) from the heat sink. I'll be interested to see what brickfense suggests.
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Lynnor, this is not an answer but I can not add images to comments. This is to support "mayer"'s answer.
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I was careful with the screws and believe I am using the correct ones. Could you take a photo of the screws I should be using if you have them handy? I want to verify I am using the correct ones.
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