Best way to find short source in a MOBO ?

Discussion in 'General Electronics Chat' started by LETITROLL, Jun 27, 2014.

  1. LETITROLL

    Thread Starter Member

    Oct 9, 2013
    218
    2
    I have recently got a 360 console from a friend , the motherboard was having shorts all over the main mosfets feeding the CPU and GPU particularly between drain and source , and also all the caps around them and around the GPU/CPU as well as a bulged cap , but even after replacing that cap , nothing has changed .

    So after reading some stuf on some forums , a lot of guys say that its mostly one or two of the mosfets that has gone bad , witch confirms what i've found , but still am not sure if its them or not .

    So what i did is trying to check one by just lifting its legs , and it was not shorted .


    So after all that , i just didn't want to mess a lot more with this MOBO , and see if i can just follow a strategy to find the short source .


    Thanks for bassing by btw .
     
  2. MrChips

    Moderator

    Oct 2, 2009
    12,447
    3,363
    The most common failure of motherboards is shorted caps across the power supply lines.

    There can be as many as a dozen caps 1000μF or greater and a single one could be shorting. The only solution is to keep removing the caps one at a time until the short goes away.
     
  3. LETITROLL

    Thread Starter Member

    Oct 9, 2013
    218
    2
    Ok i will try that and see hopefully
     
  4. LETITROLL

    Thread Starter Member

    Oct 9, 2013
    218
    2
    Hi again

    Funny thing is that i discovered that a coil waqs causing those shorts , and that the fets are 'normally' shorted .

    Thanks for the comment
     
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