Computer PSU Repair Attempt Oct 26, 2011

Computer PSU Repair Attempt Oct 26, 2011

I attempt to repair a damaged psu at 10pm with “optimistic” results. This is actually the second evening; the first being for dismantlement, case modification, and re-soldering.

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  1. Doctor Stalker ne.Rd
    Doctor Stalker ne.Rd 14 March, 2022, 00:07

    part 2
    Well, the caps weren't holding a charge so I foolishly removed the resistor AND 2 amp fuse, and plugged the cord in. One capacitor shorted internally @100V and the resulting electrical fire, blown diodes, and crispy wiring stunned me so much I felt no fear despite my face being, as in this video, so close.

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  2. Doctor Stalker ne.Rd
    Doctor Stalker ne.Rd 14 March, 2022, 00:07

    @MrSoundshark A couple years ago I removed the mains capacitors from a PSU (for a coilgun) and charged them directly from a wall socket through a 220 ohm resistor. The 200V caps were connected in series to be charged with a 2-diode voltage doubler to 340V.

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  3. MrSoundshark
    MrSoundshark 14 March, 2022, 00:07

    @DoctorStalker1 at least you get some nice parts to play with out of it 🙂

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  4. Doctor Stalker ne.Rd
    Doctor Stalker ne.Rd 14 March, 2022, 00:07

    @MrSoundshark
    The wire is actually coated with enamel insulation or something similar so I wasn't too worried. Had the repair been successful, I would have encapsulated the wire with shrink tubing.

    A variac would have been a good thing to use at the time, but I haven't gotten around to ordering one yet, nor need one often. Plus, risk (and sparks shooting everywhere) is sometimes fun.

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  5. MrSoundshark
    MrSoundshark 14 March, 2022, 00:07

    Nice vid.
    Are you not concerned with the return live being unsheathed? also i tend to bring them up to voltage using a variac to avoid losing my eye brows 🙂 but every fail is a step closer to a repair.

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  6. Doctor Stalker ne.Rd
    Doctor Stalker ne.Rd 14 March, 2022, 00:07

    @Alex1M6 Some time ago a ceiling light burned out and really popped. I was partially blinded my heart rate doubled. The transistor frying was 50% expected but I still put my face kind of close. 🙂

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  7. Alex1M6
    Alex1M6 14 March, 2022, 00:07

    I had a desk lamp do that to me the other day, my face was directly over the bulb when I turned it on the element instantly went pop and the fuse (all our plugs have fuses where I live) went too. I know it was only a light bulb but I was not expecting it and it made me jump lol.

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