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    #1

    Gigabyte 8S661FXM-RZ

    This came in with badcaps in PS and VRM input. No boot.

    Replaced caps still no boot. Problem is in VRM\CPU area. VRM output 0.57V with no CPU present but fan connected. 0.06V with CPU present. Have checked for shorted caps, none. Have checked for shorted or melted MOSFETs , none.

    I suspect CPU is burned fan and heatsink clogged with dirt (now clean) there appear to be some hot spot colours on the top of the CPU, green at centre flairing out to black then brown, like a spark burn.

    I expected the VRM output to be higher with no CPU load. Is VRM output stable with no load??? What voltage should be expected??

    CPU is 478 Celeron 2.4Ghz. Vcore spec 1.25-1.4

    Comment please
    Last edited by davmax; 08-10-2007, 03:58 AM.
    Gigabyte EP45-DS3L Ultra Reliable (Power saver)
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    #2
    Re: Gigabyte 8S661FXM-RZ

    Forgot to state that 12Volt supply to VRM is OK
    Gigabyte EP45-DS3L Ultra Reliable (Power saver)
    Intel E8400 (3000Mhz) Bios temps. 4096Mb 800Mhz DDR2 Corsair XMS2 4-4-4-12
    160Gb WD SATAII Server grade
    Nvidia 8500GT 256Mb
    160Gb WD eSATAII Server grade for backup.
    Samsung 18x DVD writer
    Pioneer 16x DVD writer + 6x Dual layer
    33 way card reader
    Windows XP Pro SP3
    Thermaltake Matrix case with 430W Silent Power
    17" Benq FP737s LCD monitor
    HP Officejet Pro K5300 with refillable tanks

    Comment

      #3
      Re: Gigabyte 8S661FXM-RZ

      I suspect that removing the CPU is not a good test of VRM in that I believe the CPU is involved in setting the core voltage. Is this right? I do not want to rush out and get another CPU without some confirmation that VRM is OK as components suggest.
      Gigabyte EP45-DS3L Ultra Reliable (Power saver)
      Intel E8400 (3000Mhz) Bios temps. 4096Mb 800Mhz DDR2 Corsair XMS2 4-4-4-12
      160Gb WD SATAII Server grade
      Nvidia 8500GT 256Mb
      160Gb WD eSATAII Server grade for backup.
      Samsung 18x DVD writer
      Pioneer 16x DVD writer + 6x Dual layer
      33 way card reader
      Windows XP Pro SP3
      Thermaltake Matrix case with 430W Silent Power
      17" Benq FP737s LCD monitor
      HP Officejet Pro K5300 with refillable tanks

      Comment

        #4
        Re: Gigabyte 8S661FXM-RZ

        measure cpu core across the mlcc on the underside.
        best way to detect shorted core.
        vrm output is set by vid pins.
        different steppings need different vcore so intel sets up vid pins to suit.

        Comment

          #5
          Re: Gigabyte 8S661FXM-RZ

          kc8adu thanks.
          I have been measuring core at VRM output caps. I guess this is close. It has been effective with working systems. Certainly pulled low by CPU in this case.
          I think I read you correctly that CPU sets voltage via VID pins.

          It therefore appears CPU is toast. Do you agree?
          Gigabyte EP45-DS3L Ultra Reliable (Power saver)
          Intel E8400 (3000Mhz) Bios temps. 4096Mb 800Mhz DDR2 Corsair XMS2 4-4-4-12
          160Gb WD SATAII Server grade
          Nvidia 8500GT 256Mb
          160Gb WD eSATAII Server grade for backup.
          Samsung 18x DVD writer
          Pioneer 16x DVD writer + 6x Dual layer
          33 way card reader
          Windows XP Pro SP3
          Thermaltake Matrix case with 430W Silent Power
          17" Benq FP737s LCD monitor
          HP Officejet Pro K5300 with refillable tanks

          Comment

            #6
            Re: Gigabyte 8S661FXM-RZ

            if I understand about VRM from what I read in a zillion page pdf on it
            yep the cpu tells it via vid what voltage it requires

            Anyway a quick search found a wiki

            The correct supply voltage is communicated by the microprocessor to the VRM at startup via a number of bits called VID (voltage identificator). In particular, the VRM initially provides a standard supply voltage to the VID logic, which is the part of the processor whose only aim is to then send the VID to the VRM. When the VRM has received the VID identifying the required supply voltage, it starts acting as a voltage regulator, providing the required constant voltage supply to the processor.
            Wikihere

            not much else of any real use there...intel link maybe

            HTH and yeah I'll leave it to KC8 if its stuffed or not
            (not the guru here, my guess probably)

            Cheers Davmax..and were you been hiding? all
            You step into the Road, and if you don't keep your feet, there is no knowing where you may be swept off to." Bilbo Baggins ...

            Comment

              #7
              Re: Gigabyte 8S661FXM-RZ

              Originally posted by davmax
              I suspect CPU is burned fan and heatsink clogged with dirt (now clean) there appear to be some hot spot colours on the top of the CPU, green at centre flairing out to black then brown, like a spark burn.
              That really does not sound healthy! It seems like something has been getting whatever is at the black and brown coloured areas quite hot. My guess would be that the CPU is toast. A sure way to find out is to test the CPU in a known working motherboard, although a lot of the time this is not possible. A picture may be helpful if possible.

              Comment

                #8
                Re: Gigabyte 8S661FXM-RZ

                Akor posted a VRM checking procedure (how applicable it is don't know, possibly you have already done this) and the other thing that crossed my mind was Possibly The MB my have become a CPU killer
                there is a thread Identifying a CPU killer (ahead of time) help
                maybe you have all read done this too but thought Id add it anyway....

                your dead (clogged) fan and over heated CPU, might really be it most likely.

                Another idea is to possibly identify the VRM controller chip (possibly support chips) and grab the pdf for it so you can get a better idea of how the VRM is put together on that PCB.

                Like I said, not the guru... just trying to help in my own small way

                cheers all
                You step into the Road, and if you don't keep your feet, there is no knowing where you may be swept off to." Bilbo Baggins ...

                Comment

                  #9
                  Re: Gigabyte 8S661FXM-RZ

                  starfury1. Many thanks for links. Useful. I have now identified the problem as VRM failure and I am replacing the motherboard. Getting a better one with Intel chipset and dual mem controller, better for customer.
                  Gigabyte EP45-DS3L Ultra Reliable (Power saver)
                  Intel E8400 (3000Mhz) Bios temps. 4096Mb 800Mhz DDR2 Corsair XMS2 4-4-4-12
                  160Gb WD SATAII Server grade
                  Nvidia 8500GT 256Mb
                  160Gb WD eSATAII Server grade for backup.
                  Samsung 18x DVD writer
                  Pioneer 16x DVD writer + 6x Dual layer
                  33 way card reader
                  Windows XP Pro SP3
                  Thermaltake Matrix case with 430W Silent Power
                  17" Benq FP737s LCD monitor
                  HP Officejet Pro K5300 with refillable tanks

                  Comment

                    #10
                    Re: Gigabyte 8S661FXM-RZ

                    No worries Daxmax glad I was of some help

                    Cheers mate

                    correction for my above post..."already done this"...DOH!
                    Last edited by starfury1; 08-11-2007, 10:09 AM.
                    You step into the Road, and if you don't keep your feet, there is no knowing where you may be swept off to." Bilbo Baggins ...

                    Comment

                      #11
                      Re: Gigabyte 8S661FXM-RZ

                      i also got one of these and i can see for sure that the caps are gone as three are bulged. as a matter of interest was the three caps between the agp slot and heatsink mounting made by rubycon or have they been replaced in the past. can all caps be purchased from maplins?

                      Comment

                        #12
                        Re: Gigabyte 8S661FXM-RZ

                        I have an identical problem with a 8s661fxm-rz socket 478 board
                        Did anyone resolve this one?


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