MSI 7600 GT, shorted capacitors

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  • FlameOnion
    New Member
    • Nov 2021
    • 6
    • ROmania

    #1

    MSI 7600 GT, shorted capacitors

    I got this gpu that does not work, is not detected in windows(not shown as a pcie device),the heatsink got a little warm. MSI 7600 GT PCIE, NX7600GT-T2D256EZ.

    Tested in different motherboards, same issue. I got it with a capacitor broken(one leg was left), and an broken indictor related to fan pwm I think.
    As a hobby I tinkered with arduino, I got a soldering iron and a hot air gun, no experience in repairing(occasionally watched videos of northridgefix)

    I measured randomly capacitors for short and found some shorts on a few, and found short on a few mosfets.

    The big black square 1R0 inductor, has 4 leads and are all shorted with 0 ohm.

    Now I am at:
    Lifted the Source pins of mosfet Q10 and Q11 that connect to ground(that I did not knew they were ground)

    I somehow found a schematic that looks like the gpu I have.

    Found https://www.badcaps.net/forum/troubl...801#post918801
    Someone talks about something that I don't know, situation when it may appear shorted but is not:
    Q4, Q5, and Q10 are all "low-side"-type MOSFETs (i.e. they are connected between GPU/RAM power rail and ground. Therefore, they may appear to be shorted between Source and Drain while on the board, but actually be okay when removed. This will vary for different GPUs. If they show a short-circuit or less than 20 Ohms resistance, then the only way to know for sure is to remove them from the board.
  • DynaxSC
    Badcaps Veteran
    • Apr 2021
    • 461
    • Poland

    #2
    Shorted mosfets have usually also shorted source pin, this is a good indication for a shorted mosfet. Else u can just remove the coils or lift one pad of them if possible, this is optimal way to check mosfets. Remember mosftes can stay electronically on (shorted) some longer time even not powered, so to go sure it might be necessary to switch them off with correct voltage on source, before measuring a short between source and drain.

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