Weird Voltages after recapping, wont post.

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  • Calchaqui
    Senior Member
    • Oct 2005
    • 112
    #1

    Weird Voltages after recapping, wont post.

    PCCHIPS P17G, was working good just freeze up sometimes. Reccaped almost the whole board, w/good caps, problem is wont post, coils shows 0.3v and run extra-hot, but output solid caps shows 1.25v (right for pentium D), and input caps 10.85v. I dont know if it is one or all mosfet shorted, or could coils be bad? why i still get Vcore on output little caps?? i dont get it

    thnx for help
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    • Calchaqui
      Senior Member
      • Oct 2005
      • 112
      #2
      Re: Weird Voltages after recapping, wont post.

      Anybody out there? :S:S
      I LOVE WWW.BADCAPS.NET

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        • cheapie
          null
          • Jul 2010
          • 849
          • USA
          #3
          Re: Weird Voltages after recapping, wont post.

          Knowing PCChips, you may have damaged the board when installing the caps. Also, it could be a non-cap-related issue (i.e. bad chipset). Did you use Low ESR caps? All the voltages sound right, but with non-Low ESR caps the ripple will be WAY out of spec, and the CPU won't like that (and you may fry it).

            Comment

            • Calchaqui
              Senior Member
              • Oct 2005
              • 112
              #4
              Re: Weird Voltages after recapping, wont post.

              Originally posted by cheapie
              Knowing PCChips, you may have damaged the board when installing the caps. Also, it could be a non-cap-related issue (i.e. bad chipset). Did you use Low ESR caps? All the voltages sound right, but with non-Low ESR caps the ripple will be WAY out of spec, and the CPU won't like that (and you may fry it).
              WHy is that buddy (about damaging the pcchips)?, I had BIG TIME trouble removing output caps, it was the hardest soldering ive ever seen.

              I've cut all the source leg mosfet leg, and they measure infinity resistance between S-D, so, 95% prob. they're good.

              Coils get ultra hot, but i've used good low esr caps. Chipset/south is not even warm? should it be?
              I LOVE WWW.BADCAPS.NET

                Comment

                • euromatlox
                  Senior Member
                  • Mar 2013
                  • 60
                  • Finland
                  #5
                  Re: Weird Voltages after recapping, wont post.

                  There are only a few caps around cpu, so it might be that those must be supergood and superlow esr caps. You must compare the datasheets of the originals vs replacements, to verify that ripple current capabilities are close enough or better on replacements. Power source unit can also be (quickly) checked for leaking caps.

                    Comment

                    • Calchaqui
                      Senior Member
                      • Oct 2005
                      • 112
                      #6
                      Re: Weird Voltages after recapping, wont post.

                      I'm almost giving up with this one....Maybe those ultra hot coils are just that way and problem is on Southbridge (mobo had toubles recognize HD), dont know if reflow or give up
                      I LOVE WWW.BADCAPS.NET

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                        • cheapie
                          null
                          • Jul 2010
                          • 849
                          • USA
                          #7
                          Re: Weird Voltages after recapping, wont post.

                          Originally posted by Calchaqui
                          Chipset/south is not even warm? should it be?
                          Yes... Judging by some of your other posts, it sounds like you have a fried SB.

                            Comment

                            • RJARRRPCGP
                              Badcaps Legend
                              • Jul 2004
                              • 6304
                              • USA
                              #8
                              Re: Weird Voltages after recapping, wont post.

                              May be a shorting socket pin, with it being a 775.....
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                                • Logistics
                                  Badcaps Veteran
                                  • Apr 2007
                                  • 721
                                  • USA
                                  #9
                                  Re: Weird Voltages after recapping, wont post.

                                  Originally posted by RJARRRPCGP
                                  May be a shorting socket pin, with it being a 775.....
                                  Dude, my Asus 775 board had this issue a few times; suddenly I get no post. Then, after examining things, i pop out the CPU and find a contact or two look oxidized. Clean and replace always fixed it.

                                  By the way, there was no mention of the OP's power supply. If the board was freezing, it may have had bad caps, but sometimes the power supply caps going bad in turn cause yhe motherboard caps to fail. Now, that he has fresh caps on the board, the PSU might be laughing at the prospect of adequately firing up his new, low-impedance caps.
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                                    Comment

                                    • Agent24
                                      I see dead caps
                                      • Oct 2007
                                      • 4976
                                      • New Zealand
                                      #10
                                      Re: Weird Voltages after recapping, wont post.

                                      Originally posted by Calchaqui
                                      I had BIG TIME trouble removing output caps, it was the hardest soldering ive ever seen.
                                      Could be you damaged the board perhaps?
                                      "Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
                                      -David VanHorn

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                                        • momaka
                                          master hoarder
                                          • May 2008
                                          • 12175
                                          • Bulgaria
                                          #11
                                          Re: Weird Voltages after recapping, wont post.

                                          Originally posted by Calchaqui
                                          Anybody out there? :S:S
                                          What brand and model of power supply are you using. There is no way you should be getting 10.8V on those input caps since they are connected to the 12V rail. If that really is the case, you may have a weak or bad PSU.

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