Repairing gold contact on back of i7-6700k Faulty Silver Conductive paint paste glue

[Matt Dower]

Hi guys,

I've just purchased a faulty i7-6700k that has one of the gold contacts missing from the back place, as you can see in the picture.

From my understanding the gold is there to stop oxidisation and protect the contact, but it might work without it.
However if it doesn't work I was going to paint over the contact with silver conductive paint to protect the contact and hopefully make good conductive contact with the CPU pin on the motherboard.

Just wondering if anyone else has dealt with this or knows of the best way to fix it?

Thanks

 

[Eximo]

Worth a shot.

But I fail to see how that damage could have been caused outside of an electrical problem. Seems like the pad was blown off by a discharge. Or someone decided to very carefully scratch it off.

What I might sit down and do is figure out if it was a power pin or a ground pin. (no idea where you might get pin outs from, maybe one of the enthusiast overclocking forums might know) Usually a few grounds can go missing, so it is likely not one. If it is 12V voltage pin it is possible the VRMs on the last motherboard it was in blew it out, which may have damaged more than can be seen.

 

[cryoburner]

What I might sit down and do is figure out if it was a power pin or a ground pin. (no idea where you might get pin outs from, maybe one of the enthusiast overclocking forums might know) Usually a few grounds can go missing, so it is likely not one. If it is 12V voltage pin it is possible the VRMs on the last motherboard it was in blew it out, which may have damaged more than can be seen.

Judging by this map of the motherboard pinout that supposedly applies to Intel's 6th and 7th gen Core CPUs (I can't say how accurate it is), that looks like it matches up with pin AT-18, which is marked VDDQ, which I believe would be one of the pins providing voltage for the memory controller...

abload.de/image.php?img=kl1bmssz.png

Edit: I noticed that the image host for that diagram attempted to open multiple popup ads and an overlay ad when I tested the link without a content blocker, so you might not want to view it there without one. I edited the link so people will have to copy and paste it, in any case. I couldn't locate another full-resolution version of that diagram, but AnandTech included a scaled and somewhat blurry version in one of their articles, if anyone would prefer to view it there instead...
https://www.anandtech.com/show/11859/the-anandtech-coffee-lake-review-8700k-and-8400-initial-numbers/3

 

[CompuTronix]

Matt Dower,

6th Generation - Datasheet, Volume 1: https://www.intel.com/content/dam/www/public/us/en/documents/datasheets/desktop-6th-gen-core-family-datasheet-vol-1.pdf

See Page 109 Table 6-13, Page 111 Table 7-1 Eighth Row, Page 115 Table 7-4 Second Row, & Page 128 Figure 9-2.

The Land that's failed is AT18, which is VDDQ (Integrated Memory Controller Power Rail).

It's 1 of 16 redundant VDDQ Lands. If it was the only such Land on the processor, then it would never work again.

However, if there's no other damage to the processor, then you stand a fair chance that it'll be OK. The only way to know for certain is to give it a try.

CT

 

[Matt Dower]

Hey guys,

Thanks for the detailed replies, the CPU should arrive tomorrow so I'll give it a test and update you all on the results!

Thanks

 

[diellur]

Out of interest, why are you accepting a faulty CPU? Have you bought this online second hand or are you getting it from a friend?

 

[Matt Dower]

Hey guys,

CPU arrived today and i said I'd give you an update and.......... IT WORKS!

I didn't have to do any repairs I just dropped it into the CPU socket and away it went!
I've managed to get 4.6 ghz overclock on it as well, getting max temps of 65'C on cinebench and scoring 891!

Thanks for all the info anyway, I'll keep an eye on the memory voltages like you guys pointed out.

So got a i7-6700k for £100, now I can sell my i5-6600k and make some profit!

 

[diellur]

Happy days - glad it's turned out OK.