Would just recapping solve my problem - desoldered MOSFETs

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  • pinkpaul
    New Member
    • Dec 2007
    • 1
    #21
    Re: Would just recapping solve my problem - desoldered MOSFETs

    Regarding the question about a replacement for the NEC 2SK3405 (K3405) may I add the following: on my GIGABYTE GA-7VA the same FET got burnt. I replaced it with a FAIRCHILD FDB6030L from a scrap motherboard. Now it is back to life again.

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      • Topcat
        The Boss Stooge
        • Oct 2003
        • 16955
        • United States
        #22
        Re: Would just recapping solve my problem - desoldered MOSFETs

        if you replaced the fet's, and its living again, definitely recap it. the crap caps are what cause the FET's to die in the first place (gigabyte boards are notorious for this). Replace those nasty 330uF 25v choyo's as well. It's safe to use a 6.3v cap in place of those 25v choyo's, I typically replace them with 470uF caps. ...but yea, definitely recap it, it'll save you future FET replacements.
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          • tvtech
            Member
            • Oct 2006
            • 48
            #23
            Re: Would just recapping solve my problem - desoldered MOSFETs

            I second that,replace all of the filters in the vrm circuit,that was the reason why the fet shorted out to begin with,they usually dont short for no good reason.

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              • Kaine
                Senior Member
                • Mar 2007
                • 55
                #24
                Re: Would just recapping solve my problem - desoldered MOSFETs

                Anyone got any tips for safely removing and replacing FETs? I'm having serious trouble getting them off.

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                  • Kaine
                    Senior Member
                    • Mar 2007
                    • 55
                    #25
                    Re: Would just recapping solve my problem - desoldered MOSFETs

                    edit: never mind, worked it out . Quick question. Are these two components interchangeable and am i right in deducting that the Infineon 06N03LA is superior to the Advanced Power 9918H? (data sheet attached)

                    I'm pretty sure my ASUS board is fitted with the Advanced Power FETs, while i have a good deal of the Infineon units available from a Foxconn board (that also carried some nice juicy Rubycon MBZs that i'll be using to replace the UCC KZGs (they're higher capacity, have lower ESR and higher Ripple stats)

                    I'm trying to get the ASUS power delivery as good as it can be for overclocking experiments.
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