U5 and U6 output shorting to ground

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  • #25425
    Tiki
    Participant

    Hi,

    So, this all started with me accidentally using a 12V power supply and basically instantly breaking my pre-made OSSC. I replaced F1 and D5 after finding that they were both broken, but my unit still didn’t show any signs of life, so I also replaced U5 and U6. Still nothing, but now I’ve realized the output pins of U5 and U6 are shorting to ground. I checked all of the voltage regulators for shorts to ground, and here is what I found:

    U5 – Output shorts to ground
    U6 – Output shorts to ground
    U7 – Input and EN short to ground
    U9 – Input and EN short to ground
    U12 – Input, EN, and Output short to ground
    U13 – Input and EN short to ground
    U14 – Input and EN short to ground
    U15 – Input, EN, and Output short to ground
    U16 – Input and EN short to ground

    I’m good with soldering, but have a limited understanding of circuitry in general – what are my options here? Do I have a shot if I just replace all the voltage regulators, or does this mean something is wrong with the FPGA or something else?

    #25465
    DevLatron
    Participant

    Chances are you fried quite a bit there.

    Just replacing parts is probably going to take the longest time…

    I can have a look at the schematics.

    Basically, your plan of attack would be to identify the damaged parts by removing pieces and checking if the short persists down or upwards of the rail.

    First, I’d have a good look at all parts. Visual inspection is important!

    You can remove the regulators and then check for shorts again.

    #25467
    Tiki
    Participant

    Thanks! I think I’ll start the process of removing parts to identify what’s fried near the end of this week. Upon visual inspection under a 10x magnifying glass, nothing immediately jumps out as alarming…

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