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Motherboard repair help

Discussion in 'Troubleshooting and Repair' started by remzy, Mar 24, 2017.

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  1. remzy

    remzy

    47
    1
    Jun 12, 2015
    Hello everyone! I've came here to seek for wisdom of more experienced people. The problem I have with my motherboard ASUS 5pg41-m lx is that there is a short somewhere and for the love of God i can't find it. There is one specific mosfet that burst every time when I replace it. There are 8 of them around the CPU and it's always the same one, the other ones always survive. I thought that my CPU was shorted at first, but after changing 3 CPU-s, the problem is still the same. I did found one shorted capacitor but that was it. Has anyone maybe came across the problem like this or had similiar experience. I would like to hear your opinion on this matter. Here are some pictures. There is flux on the board from resoldering mosfets on the motherboard. The circled mosfet is the problematic one. Also the two wires coming form the motherboard are connected to a capacitor, it couldn't fit between the coils so I just put it little above(that was the shorted one).

    [​IMG]
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  2. tedstruk

    tedstruk

    475
    7
    Jan 7, 2012
    I really hate to sat this stuff.
    I have found from past experience that motherboards are extremely touchy when they fail. It is easier and less costly to replace the motherboard than to try and find a bad component. Most are assembled by robots and trying to second guess their circuits is futile and can lead to damage of more than just the motherboard. See what they cost. You might be suprised.
     
  3. remzy

    remzy

    47
    1
    Jun 12, 2015
    True but in my country people are pricing lga775 mobos like they are lga 1150 mobos, it's crazy. That's why I'm so eager to fix it. :D
     
  4. remzy

    remzy

    47
    1
    Jun 12, 2015
    I think I've found what's the problem. I was touching components on the mobo while it was plugged in and this component was especially hot, seems to me like it's in short.circuit. Can't find much information about it. It's called EPU asp0905b
    [​IMG]
     
  5. davenn

    davenn Moderator

    13,381
    1,784
    Sep 5, 2009
    unless you have access to specialist IC rework gear, it's going to be impossible to replace
     
  6. remzy

    remzy

    47
    1
    Jun 12, 2015
    I've done it before with a heat gun. It's not as elegant of a job as it would be if I had specialist IC rework gear but it can be done.
    I think that package type is "Quad flat package"
     
    Last edited: Mar 25, 2017
  7. tedstruk

    tedstruk

    475
    7
    Jan 7, 2012
    have fun! I have found that most shorts are caused by something metal wedged between the mobo and the case, touching a hot or even a wire connector.

    even a hair of copper wire, or a spit ball can cause this stuff.
     
    remzy likes this.
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