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    #1

    Asus ptgd la

    Howdy
    I have an asus ptgd-la that has died recently.
    The caps that failed are KZG's by the vrm and memory (2x 1500uF 6.3v and 3x 1000uF 16v, both 8mmx20mm). I am interested in knowing what would be good replacements and if any of the following caps on the board should be replaced as well.

    13x MBZ and 2x HM- 820uF 6.3v 8x12
    2x Fujitsu- 680uF 6.3v 10x12 (not sure of the model; black on yellow with 'M 5352U' and deep K vent)
    11x ? 680uF 4v 8x8. These are at vcore; gold on black, no vent, with '530Hb' printed on and the letter M in a box.
    2x YXG- 470uF 6.3v 6x12
    1x ZL- 330uF 6.3uF 6x12
    3x Yageo SK- 220uF 16v 6x12
    The only other caps on the board aside from these are small Ltecs used in sound components.

    Thanks for your assistance.
    Tags: None
    #2
    Re: Asus ptgd la

    I would start and just replace all the KZG's.

    Comment

      #3
      Re: Asus ptgd la

      Originally posted by JAnderson View Post
      The caps that failed are KZG's by the vrm and memory (2x 1500uF 6.3v and 3x 1000uF 16v, both 8mmx20mm). I am interested in knowing what would be good replacements and if any of the following caps on the board should be replaced as well.
      UCC KZG are a problematic series. They fail without bloating as well.

      I think PCBONEZ had a table of acceptable replacements. Let me look around for it.

      13x MBZ and 2x HM- 820uF 6.3v 8x12
      2x Fujitsu- 680uF 6.3v 10x12 (not sure of the model; black on yellow with 'M 5352U' and deep K vent)
      11x ? 680uF 4v 8x8. These are at vcore; gold on black, no vent, with '530Hb' printed on and the letter M in a box.
      2x YXG- 470uF 6.3v 6x12
      1x ZL- 330uF 6.3uF 6x12
      3x Yageo SK- 220uF 16v 6x12
      The only other caps on the board aside from these are small Ltecs used in sound components.
      MBZ, YXG, ZL are all Rubycon and good caps.
      "M" is Panasonic and good caps.
      Not sure about the Fujitsu, Ltec, and Yageo and if they are decent caps or not.
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      Comment

        #4
        Re: Asus ptgd la

        Here is a table that PCBONEZ put together that shows caps comparable to KZG in terms of ESR. You also want ripple to be the same or better.

        https://www.badcaps.net/forum/showpo...7&postcount=88
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        We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.

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        Comment

          #5
          Re: Asus ptgd la

          Great, thanks for the quick response

          Comment

            #6
            Re: Asus ptgd la

            13x MBZ and 2x HM- 820uF 6.3v 8x12
            2x Fujitsu- 680uF 6.3v 10x12 (not sure of the model; black on yellow with 'M 5352U' and deep K vent)
            11x ? 680uF 4v 8x8. These are at vcore; gold on black, no vent, with '530Hb' printed on and the letter M in a box.
            2x YXG- 470uF 6.3v 6x12
            1x ZL- 330uF 6.3uF 6x12
            3x Yageo SK- 220uF 16v 6x12
            The only other caps on the board aside from these are small Ltecs used in sound components.
            I don't see any inferior caps here except maybe for the Yageo SK. The caps by the Vcore sound like Panasonic. Leave the Fujitsu and Ltec alone. The Fujis are probably some of the best polymers ever made, and the Ltecs are probably ok.

            The Yageo "SK" are general purpose caps and can be replaced with Panasonic FC class capacitors. The KZG should be replaced with something like Nichicon HM/HN, Rubycon MBZ/MCZ, Samxon GD,GC, etc...

            The 8mm KZGs are very common on Asus boards... I keep a little stock of those because a lot of Asus boards of that time have them...

            For the 16V 1000uF, use this:
            https://www.badcaps.net/store/produc...products_id=45

            Unfortunately, Topcat has no stock of any equivalent 6.3V 1500uF 8mm parts...
            "We have offered them (the Arabs) a sensible way for so many years. But no, they wanted to fight. Fine! We gave them technology, the latest, the kind even Vietnam didn't have. They had double superiority in tanks and aircraft, triple in artillery, and in air defense and anti-tank weapons they had absolute supremacy. And what? Once again they were beaten. Once again they scrammed [sic]. Once again they screamed for us to come save them. Sadat woke me up in the middle of the night twice over the phone, 'Save me!' He demanded to send Soviet troops, and immediately! No! We are not going to fight for them."

            -Leonid Brezhnev (On the Yom Kippur War)

            Comment

              #7
              Re: Asus ptgd la

              I replaced the KZGs last night but the board is still not powering up (the cpu fan twitches a little and the monitor turns on and goes into sleep mode). At this point I am guessing there is something else wrong with the VRM, but I don't really know how to troubleshoot it. Pobing around with the multi meter is showing only 4.6ohms between the +12v and ground on the 4pin. Also, one of the mosfets is showing all three pins are connected to ground. I asume these are abnormal readings?

              Comment

                #8
                Re: Asus ptgd la

                yes shorted mosfet.

                Comment

                  #9
                  Re: Asus ptgd la

                  Cool. Any advice on other points of failure I can test?

                  Comment

                    #10
                    Re: Asus ptgd la

                    Take out the shorted mosfet and check the 12v input for shorts again. If it's clear, just swap a new one in and power it up.
                    Originally posted by PeteS in CA
                    Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
                    A working TV? How boring!

                    Comment

                      #11
                      Re: Asus ptgd la

                      I took the piece out and the atx 12v seems normal now. The IDs are 13N03LA and GAL504. The first code links to an infineon series of mosfets, but I am not sure what the second code is. This one seems close http://goo.gl/il6o3

                      Also, I realized that I haven't explained how the fault occured. I was changing the resolution (on-board intel 915gv) when the computer crashed and tried to reboot. The fans shut down and only the power led came on at first, then there were no signs of power after a manualy attempted restart.
                      Normally the screen goes blank for a moment while changing resolutions. Could it be that this causes power spikes that busted caps can not handle, thus causing the transistor to fail?

                      Comment

                        #12
                        Re: Asus ptgd la

                        The second row is just a factory serial number, it is irrelevant. The one you linked to will work fine.

                        We can sit and elaborate theories about why it died all day long. But the fact is, change that MOSFET and those caps and you'll be a-ok.
                        Originally posted by PeteS in CA
                        Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
                        A working TV? How boring!

                        Comment

                          #13
                          Re: Asus ptgd la

                          IT'S ALIVE! Thank you all for lending me your time and expertise. I was kind of worried because I pulled a trace a little bit when desoldering the mosfet, but it seems everything is working okay.

                          Comment

                            #14
                            Re: Asus ptgd la

                            How do you test for busted MOSFETS? My DMM only has a voltage and Ohms measurement.
                            "We have offered them (the Arabs) a sensible way for so many years. But no, they wanted to fight. Fine! We gave them technology, the latest, the kind even Vietnam didn't have. They had double superiority in tanks and aircraft, triple in artillery, and in air defense and anti-tank weapons they had absolute supremacy. And what? Once again they were beaten. Once again they scrammed [sic]. Once again they screamed for us to come save them. Sadat woke me up in the middle of the night twice over the phone, 'Save me!' He demanded to send Soviet troops, and immediately! No! We are not going to fight for them."

                            -Leonid Brezhnev (On the Yom Kippur War)

                            Comment

                              #15
                              Re: Asus ptgd la

                              Ohms readings should indicate that you have a short/ continuity when there is little or no resistance (so if there is low impedence between gate drain and source, you have a short). Some multimeters also have a separate continuity option; the symbol on the dial looks like a diode and the meter beeps when the probes are in a closed circuit.
                              In my case I noticed a short between 12v and ground on the 4pin by the cpu. From there I probed at random untill I found that the transistor closest to the power input had continuity between every contact, power, and ground.
                              Last edited by JAnderson; 10-07-2011, 02:35 PM.

                              Comment

                                #16
                                Re: Asus ptgd la

                                Here is some more in depth info on testing www.4qdtec.com/mostest.html

                                Comment

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