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De-lid gone bad?

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post #1 of 16 (permalink) Old 03-06-2015, 04:32 AM - Thread Starter
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So I've spent the las week adding the finishing touches on my build and testing everything to make sure all the hardware is working properly while overclocked and all that fun stuff. So yesterday I decided to go ahead and de-lid my 4790k and replace the TIM with Arctic MX-4. With the lack of tools I was forced to use a razor blade to de-lid. I thought everything went well until it was all back together and then it failed to post. ***. So upon further investigation I removed the CPU again to discover that I had scratched the PCB under the lid. There are 2 or so decent deep cuts that I feel stupid for being so careless. So would this be the problem? Because I'm hoping its not the motherboard. The debug led code on the motherboard doesn't even give a code so I'm clueless as what could be the problem. I've tried all the basic stuff like using one stick of RAM and trying different slots. I would really appreciate all help. Thanks in advance.
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post #2 of 16 (permalink) Old 03-06-2015, 05:00 AM
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The scratches on the PCB are the cause of the issue.

You could look at PCB repair guides, but this does not usually work for CPU's.

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post #3 of 16 (permalink) Old 03-06-2015, 05:05 AM - Thread Starter
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Yeah, I ordered a replacement. Was hoping this problem was fixable without replacing it :/
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post #4 of 16 (permalink) Old 03-06-2015, 05:07 AM - Thread Starter
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Quote:
Originally Posted by BradleyW View Post

The scratches on the PCB are the cause of the issue.

You could look at PCB repair guides, but this does not usually work for CPU's.


Could the CPU have done damage at all to any other parts by trying to boot up with those scratches on the PCB?
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post #5 of 16 (permalink) Old 03-06-2015, 05:08 AM
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You could have an exposed trace that is shorting with the lid of the CPU. Your MX-4 is non-conductive, I would put just a little dab on the scratch and see if it helps. Much like a carpenter or painter would fill a hole or scratch with wood filler. It might not work, but I have seen it work before. Worth a shot anyway while you have it out and no working CPU!

Take a picture and show us exactly what it looks like. And how deep.



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post #6 of 16 (permalink) Old 03-06-2015, 05:11 AM
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Quote:
Originally Posted by Misfit16R View Post

Could the CPU have done damage at all to any other parts by trying to boot up with those scratches on the PCB?

No.

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post #7 of 16 (permalink) Old 03-06-2015, 05:22 AM - Thread Starter
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Quote:
Originally Posted by stickg1 View Post

You could have an exposed trace that is shorting with the lid of the CPU. Your MX-4 is non-conductive, I would put just a little dab on the scratch and see if it helps. Much like a carpenter or painter would fill a hole or scratch with wood filler. It might not work, but I have seen it work before. Worth a shot anyway while you have it out and no working CPU!

Take a picture and show us exactly what it looks like. And how deep.

Thank you! I'll give that a shot when I get a chance and tell you how it works out.
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post #8 of 16 (permalink) Old 03-06-2015, 05:54 AM
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For future reference, you do not need to delid a 4790K. Intel made these chips with special TIM so that you would not have to go through this.
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post #9 of 16 (permalink) Old 03-06-2015, 05:56 AM
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I saw huge gains from delidding my 4790K, even moreso than my 3770K
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post #10 of 16 (permalink) Old 03-06-2015, 06:01 AM
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Quote:
Originally Posted by stickg1 View Post

You could have an exposed trace that is shorting with the lid of the CPU. Your MX-4 is non-conductive, I would put just a little dab on the scratch and see if it helps. Much like a carpenter or painter would fill a hole or scratch with wood filler. It might not work, but I have seen it work before. Worth a shot anyway while you have it out and no working CPU!

Take a picture and show us exactly what it looks like. And how deep.
in for pics
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