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4770k has died, taken mobo with it - replacement advice plz

Discussion in 'CPUs' started by MatteH Oxford, 29 Aug 2015.

  1. Chugz

    Gangster

    Joined: 20 Jul 2015

    Posts: 103

    If you're upgrading go X99. No point getting rubbish 4 core i7 chips anymore when the 5820K isn't too much more expensive.
     
  2. kaku

    Wise Guy

    Joined: 21 May 2013

    Posts: 1,892

    I'm pretty sure CPUs frying themselves hasn't been a problem since the Athlon XP days.
    Are you sure the problem isn't somewhere else in the system? (Dead PSU?)
     
  3. rtho782

    Wise Guy

    Joined: 13 Oct 2011

    Posts: 1,411

    Location: Suffolk

    As others have said, I can't see it being a CPU fault really.
     
  4. MatteH Oxford

    Wise Guy

    Joined: 26 Jul 2010

    Posts: 1,686

    Location: Wiltshire

    Board is a asus sabertooth z87 btw. 5 year warranty thankfully!

    I replaced the fan, the new one spins up as does the HD, mobo fans GPU etc etc but no boot into the BIOS. I've reset the CMOS jumper, pulled the battery, removed everything bar keyboard and CPU/memory/monitor, tried it without the GPU using the inboard HDMI . I tested the PSU with both the paperclip method and a multimeter.

    No good, it's hard to say if the CPU is dead, it looks like the board definitely is as there isn't any error beeps etc, no post no matter what I try.
     
  5. wazza300

    Caporegime

    Joined: 11 Jul 2009

    Posts: 27,049

    Location: BenefitStreetBirmingham

    rma the board first,then take it from there

    should also have a 3 year warranty on it
     
  6. MatteH Oxford

    Wise Guy

    Joined: 26 Jul 2010

    Posts: 1,686

    Location: Wiltshire

    Oh, idid have the mobo thermal warning set, it never tripped, the thing just insta-shutdown!
     
  7. MatteH Oxford

    Wise Guy

    Joined: 26 Jul 2010

    Posts: 1,686

    Location: Wiltshire

    Five years, found the guarantee card in the box earlier :)
    Yep rma-ing the mobo 1st
     
  8. kaku

    Wise Guy

    Joined: 21 May 2013

    Posts: 1,892

    The shutdown would have been the thermal protection kicking in.

    The warning alarm you set in the BIOS does nothing if you don't have a speaker plugged in to your motherboard.
     
  9. MatteH Oxford

    Wise Guy

    Joined: 26 Jul 2010

    Posts: 1,686

    Location: Wiltshire

    Courier pickup has been arranged for the RMA tomorrow by the CS dept at the place I bought the Mobo/CPU from :)
     
  10. Blackjack Davy

    Soldato

    Joined: 16 Aug 2009

    Posts: 5,627

    I've seen videos of people taking the heatsink off an Intel chip and it powers down to nothing as it heats up to TJmax then speeds up as the heatsink is put back on, only to slow down again as its taken off. Chip still wouldn't die.

    The fact the fan failed also suggests mobo.
     
  11. MatteH Oxford

    Wise Guy

    Joined: 26 Jul 2010

    Posts: 1,686

    Location: Wiltshire

    Motherboard is back from the RMA, tested fine apparently! :eek:
    Put everything back together, no difference from before and I spent several hours fiddling with it too.


    Looks like the cpu is going back .....
     
  12. thebennyboy

    Mobster

    Joined: 23 Dec 2013

    Posts: 3,465

    Location: North Wales

    The CPU has thermal protection hard coded into it... Not even the mobo itself can override it. Amazed it didn't shut off to protect itself.
     
  13. MatteH Oxford

    Wise Guy

    Joined: 26 Jul 2010

    Posts: 1,686

    Location: Wiltshire

    Well, it turned out to be the power supply at fault in the end, yet it passed the paper clip test and testing the voltage with a MM. It was one of the 8 pins on the eps cable (for the additional 12v to the motherboard) at fault. This cable happens to be hard wired into the PSU and is not part of the modular cabling for the dvd-rom, gfx card, HDD etc.

    The burnt electrical smell has now subsided with the replacement PSU, but my original cpu fan still doesn't work!? Odd that both it and the psu failed, the fan failing added to the confusion over if the mb/cpu were damaged.

    Thankfully I didn't send the cpu off for RMA!
     
  14. carlazai

    Mobster

    Joined: 16 Feb 2007

    Posts: 2,615

    Intel have excellent warranty support, they ask for the serial numbers and send you a new chip, easy as! Shame some shops cant offer this american experience!
     
  15. Freddie1980

    Sgarrista

    Joined: 25 Sep 2009

    Posts: 7,621

    Location: Billericay, UK

    That's good news! I was going to say when I saw your post about the motherboard I thought 'Those sabertooth's are meant to be bullet proof' and it was hard to believe that both your motherboard and CPU would die like that.

    I've had a couple of faulty PSU's in my time, bloody annoying to say the least as you always spend hours error checking everything else bar the PSU!
     
  16. MatteH Oxford

    Wise Guy

    Joined: 26 Jul 2010

    Posts: 1,686

    Location: Wiltshire

    It's saved me a lot of potential ££ expenditure, that's for sure! :)
    And especially because of how true this thread is! http://forums.overclockers.co.uk/showpost.php?p=28631592&postcount=1

    I should have checked the eps cable more closely, perhaps because of where it plugs in on the sabertooth board (right next to the cpu fan power socket) the failure of the psu killed the cpu fan....?

    Dunno, I'm just very happy to have sorted it finally.
     
    Last edited: 7 Oct 2015
  17. Reality|Bites

    Perma Banned

    Joined: 5 Apr 2006

    Posts: 7,703

    So you don't have to send the broken chip back? Could this system not be abused?
     
  18. carlazai

    Mobster

    Joined: 16 Feb 2007

    Posts: 2,615

    Ohh sorry you send the chip back but they sent me a new chip straight away lol. The rainforest send you the items before postage as they have your cc details so grab it back
     
  19. On Holiday

    Soldato

    Joined: 29 Dec 2009

    Posts: 6,777

    Yeah, CPUs don't break unless you break them :p
     
  20. linktoinsanity

    Don

    Joined: 5 Oct 2008

    Posts: 8,895

    Location: Kent

    Nice, glad you have sorted it.

    Yes PSUs can be a real pain!