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post #1 of 16 (permalink) Old 10-22-2019, 12:23 PM - Thread Starter
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9700k delid - Great! and then not...

For the past year I've been running:
9700k @ 5.3Ghz @ 1.35v
MB: Gigabyte Aorus Master Z390
Cooler: EVGA CLC AIO 280mm

I only use this rig for gaming and it's been really stable for a year. Peak per core temps rarely exceed 70C when gaming. Stress test in Intel XTU for 30 min would peak at 85C.

Last week I decided to delid and go direct to die to see how my temps would be affected so I ordered delid kid and direct to die frame from rockitcool. I wasn't too intimidated given I'd delidded before, however this would be my first time delidding a CPU with soldered TIM.

I followed the videos on rockitcool website and delidding / removing old TIM from die went smoothly. I installed the direct to die frame and applied thin layer of liquid metal to die and copper heat sink on the EVGA CLC. I also used the spacers rockitcool included on the EVGA CLC backplate to make up for the extra space now that the IHS was gone.

Direct to die frame and EVGA CLC were attached at a tightness of "stop tightening at first resistance"

I fired everything up and was excited to see average peak temps drop by 10C across all cores. Used the rig for about 12 hours of benchmarking, stress testing and gaming afterwards.

The next day I was running the TimeSpy benchmark and out of curiosity I reached over to feel how hot the CPU VRM heatsink was on the MB. (I have an open air case - the heat sink was only slightly warm). I held my finger on the heat sink for maybe 3 seconds and then the whole computer shut off and then turned back on but wouldn't POST - it just hangs with no debug code and the red CPU status light glows on the MB. Clearing CMOS, etc does nothing. When I power on it just hangs before POST. Checked PSU with multimeter and all is fine.

I'm completely stumped as to what happened. I asked myself how, if I had somehow damaged the CPU during delidding/reinstallation, the rig had worked for several hours before? Is it just a coincidence that everything went to hell when I touched the VRM heat sink? (I have a habit of doing this during more rigorous computing out of curiosity)

I took everything back apart checking first to confirm liquid metal hadn't leaked out and caused a short - it had not. I've also tried adjusting the tightness settings of the die frame and cooler heat sink having read that sometimes the socket will not make appropriate contact with CPU if the tightness is off. I feel like a tightness problem would explain me never being able to turn on the system in the first place, not this type of incident. I've also cleaned off all liquid metal from the die and there is no visible damage - it still looks brand new....I paid special attention to corners to make sure one hadn't flattened. The pins in the CPU socket also look fine.

Any ideas? I would be blaming the motherboard if I hadn't just delidded the CPU a day prior, but still not ruling out a MB problem.

Thanks for reading this long post.
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post #2 of 16 (permalink) Old 10-22-2019, 12:41 PM
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You had static charge within your body which caused a short the moment you touched metal heatsink. Basically - you most likely killed something.

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post #3 of 16 (permalink) Old 10-22-2019, 01:29 PM
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Looks like you learned a valuable and expensive lesson. Never touch a running rig unless you've ground yourself first.
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post #4 of 16 (permalink) Old 10-22-2019, 01:43 PM
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please show me static discharge (lol) killing a PC component several seconds after you touch it. if that was the case the second he touched it it'd have flipped its ****.

Far more likely you pushed the VRM heatsink too hard and it caused a short, but if it happened a few seconds after you touched it like you said then that's out too. I'd probably still take off the VRM heatsink and take a peak.

You also can't check if a PSU is good or not with a multimeter, just because you used a multimeter and it passed your multimeter test doesn't mean it's good. Unlikely it's the issue but a multimeter doesn't rule it out.

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post #5 of 16 (permalink) Old 10-22-2019, 02:07 PM
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I would think you would feel the static shock. If the heatsync caused a short, I would guess there would be an ozone smell.

I wager it's just coincident that something failed about the same time you were touching the heatsync.

Go slow and troubleshoot.

I always start with resetting everything. Also, if I have other parts, i would swap out (memory, video card, PSU etc...). Remove anything you don't need (GPU, 1 memory stick, etc....)

After the initial step, try reinstalling the stock CPU socket, place the CPU into the socket, add the IHS, and close the stock CPU hold down plate and see if it boots. If it does, you probably didn't have enough mounting pressure.

If it doesn't boot, assume something is broken. So now you have a decision point. Start RMAing and/or purchasing very cheap board/CPU to test.

I would start with purchasing a cheap 1151 CPU. If that doesn't work, RMA the board. If it works, assume you need a new 9900k or retry with different mounting pressure.

https://www.amazon.com/Intel-BX80677...8832011&sr=8-3

If you want, a cheap LGA1151 board can help solidify the issue but I don't think its needed:

https://www.amazon.com/MSI-Performan...s%2C172&sr=8-7
(Double check compatibility of course).

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post #6 of 16 (permalink) Old 10-22-2019, 03:06 PM
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Quote: Originally Posted by StAndrew View Post
I would think you would feel the static shock. If the heatsync caused a short, I would guess there would be an ozone smell.

Actually, the amount of static discharge it takes to create issues with computers is less than would be felt.


That being said I am not advocating that is what happened here, just making an observation

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post #7 of 16 (permalink) Old 10-22-2019, 04:14 PM
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Liquid metal applying issue ?
In contact with some SMD components ?

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post #8 of 16 (permalink) Old 10-22-2019, 04:55 PM
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Btw, when you get it figured out, dont use liquid metal with CU. Ni plate the copper first.
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post #9 of 16 (permalink) Old 10-22-2019, 06:45 PM
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Quote: Originally Posted by Stockman View Post
For the past year I've been running:
9700k @ 5.3Ghz @ 1.35v
MB: Gigabyte Aorus Master Z390
Cooler: EVGA CLC AIO 280mm

I only use this rig for gaming and it's been really stable for a year. Peak per core temps rarely exceed 70C when gaming. Stress test in Intel XTU for 30 min would peak at 85C.

Last week I decided to delid and go direct to die to see how my temps would be affected so I ordered delid kid and direct to die frame from rockitcool. I wasn't too intimidated given I'd delidded before, however this would be my first time delidding a CPU with soldered TIM.

I followed the videos on rockitcool website and delidding / removing old TIM from die went smoothly. I installed the direct to die frame and applied thin layer of liquid metal to die and copper heat sink on the EVGA CLC. I also used the spacers rockitcool included on the EVGA CLC backplate to make up for the extra space now that the IHS was gone.

Direct to die frame and EVGA CLC were attached at a tightness of "stop tightening at first resistance"

I fired everything up and was excited to see average peak temps drop by 10C across all cores. Used the rig for about 12 hours of benchmarking, stress testing and gaming afterwards.

The next day I was running the TimeSpy benchmark and out of curiosity I reached over to feel how hot the CPU VRM heatsink was on the MB. (I have an open air case - the heat sink was only slightly warm). I held my finger on the heat sink for maybe 3 seconds and then the whole computer shut off and then turned back on but wouldn't POST - it just hangs with no debug code and the red CPU status light glows on the MB. Clearing CMOS, etc does nothing. When I power on it just hangs before POST. Checked PSU with multimeter and all is fine.

I'm completely stumped as to what happened. I asked myself how, if I had somehow damaged the CPU during delidding/reinstallation, the rig had worked for several hours before? Is it just a coincidence that everything went to hell when I touched the VRM heat sink? (I have a habit of doing this during more rigorous computing out of curiosity)

I took everything back apart checking first to confirm liquid metal hadn't leaked out and caused a short - it had not. I've also tried adjusting the tightness settings of the die frame and cooler heat sink having read that sometimes the socket will not make appropriate contact with CPU if the tightness is off. I feel like a tightness problem would explain me never being able to turn on the system in the first place, not this type of incident. I've also cleaned off all liquid metal from the die and there is no visible damage - it still looks brand new....I paid special attention to corners to make sure one hadn't flattened. The pins in the CPU socket also look fine.

Any ideas? I would be blaming the motherboard if I hadn't just delidded the CPU a day prior, but still not ruling out a MB problem.

Thanks for reading this long post.
Was the CPU in an open air case or in open air without a case? (test bench, etc?).
What kind of case was it? One of those strange glass cases that is made to be used as a test bench?

Touching a heatsink wouldn't cause a short 3 seconds after you touched it.
How hard did you press on the heatsink?

As others said, remove the VRM heatsink and take a look underneath, and also look at the underside.
I've touched heatsinks before and never saw something like this happen. The only thing I can think of is that there was a bad soldering job, and touching the heatsink jarred something. But even that doesn't make much sense, as I'm sure the heatsink was "violated" when the board was first removed out of the box and installed !

Again, how was this board installed? Do you have pictures?
I'm guessing pressing down on the VRM heatsink (again--how hard did you press?) caused something to short underneath the motherboard. Still don't see how this would kill something completely. Again, what sort of case was this? Glass? Metal? What standoffs? Did the back of the CPU socket touch anything?

BTW did you switch to the backup BIOS? Flip the dual bios switch to "Single bios mode" and then switch the bios switch to bios 2 and see if that does anything.

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post #10 of 16 (permalink) Old 10-22-2019, 09:23 PM - Thread Starter
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Hi all and thanks for all the replies.

I bought a new G5400 CPU tonight, installed and I'm still getting the same issue. It's crazy how with either CPU the MB makes zero effort to POST. The CPU status light illuminates the instant the PSU clicks on and it halts there. BTW, I installed new CPU using the socket bracket that came with the board ( i.e. no rockit cool parts)

More details on touching the heat sink -
I placed my index finger on the side, close to pcb, under the fins. I didn't apply any pressure. Finger was on it probably close to 5 seconds before everything shut off. For better or worse I touch this area frequently when stress testing or after many hours of gaming. It's just a habit that began with how impressed I was with this board's ability to keep VRM cool.

The case is the Thermaltake Open frame.

Not sure what taking off the VRM heatsink would reveal other than a voided warranty. I didn't smell any burning or see smoke.

Tried booting to backup bios. When I do this the machine will immediately turn off then back on one time before it hangs at the usual spot. But I can confirm from the bios led that the backup was referenced. I also changed out the CMOS battery.

The only test I did to the EVGA 850 G2 was to ensure 12v was being supplied to the CPU power connector. This PSU is a year old.


Any other ideas before I RMA the board / buy a new one?
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