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Thread: Leaking voltage, normal or defective?

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    Default Leaking voltage, normal or defective?

    Howdy! I may be a computer enthusiast but I am by far from an electrical engineer, so I need some knowledgeable information. Is there something wrong with this unit, is it just cheap manufacturing, or is this unit actually unsafe for use? I need some professional advice as I do not want to sell anything defective or dangerous. If it is bad I'll just junk it for parts.

    Had a rash of really hard to troubleshoot computer issues recently, and swapping parts wasn't helping so I began looking at the PSU. Swapping PSUs didn't help, but I did find this while investigating a very faint electrical noise.

    One of the two main heatsinks has a great deal of voltage going across it, it would drop then quickly spike back up to -65 volts every second and then repeat. The second heatsink only gives readings in the millivolts scale.

    Before removing the PSU I did first check many connectors to verify the rail voltages were in line and did not observe anything unusual while the PC was under load condition.

    Since I can't get a thumbnail to work properly, here's a direct link

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    That's normal. The primary heatsink in most units is live at AC potential. That's why you should never open these things up while they're plugged in... that heatsink can bite you if you're not careful.

  3. The Following User Says Thank You to Oklahoma Wolf For This Useful Post:

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    Thanks for the reply! I didn't realize it was typical.

    Yeah, I'm well aware of the danger. Only reason it is plugged in, let alone running is I was looking for the distinctly electric buzzing noise that was indicative of a problem. I was using a voltage detector that warned me the heatsink was carrying current.

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    Move the wires to the side to see if a capacitor is leaking or has an issue.

    The caps in that unit are not of reputable quality.

    Other than that, it's most likely a coil.

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    Oh, just 62,5V on the primary heatsink?! Pretty low that is..
    I've seen far higher voltages on this heatsink like the Voltage the PFC Stage works with or rectified 230V AC (about 325V).

    And it's pretty normal that this voltage is on that heatsink. Someone told me its to lower the EMV emissions of the unit...

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    Quote Originally Posted by Stefan Payne View Post
    the EMV emissions ...
    Means what?
    CPU: Core i7 8700k, HT enabled, all 6 cores OC'd to 4.8GHz, Vcore = 1.24v
    Heatsink: Noctua NH-D15 with one NF-A15 1500 RPM PWM fan
    Motherboard: Gigabyte Z370X Aorus Gaming 7
    RAM: 4x16GB (64GB) Corsair Vengeance LPX DDR4 RAM 16-18-18-36@3200MHz, Vdimm = 1.35v
    GPU: MSI GeForce GTX 1080 DirectX 12 with 8GB 256-Bit GDDR5X
    SSD1: Samsung 840 EVO 500GB TLC; SSD2: SAMSUNG 860 EVO 1TB 3-bit MLC
    HD: WD 500GB (old); Case: LIAN LI PC-7H Aluminum ATX Mid Tower
    PSU: Seasonic Platinum 660W

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    Sorry, that was the German word.

    In english its electromagnetic compliance (or compatibility).


    EMV stands for elektromagnetische Verträglichkeit in German...

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    Quote Originally Posted by Stefan Payne View Post
    Sorry, that was the German word.

    In english its electromagnetic compliance (or compatibility).


    EMV stands for elektromagnetische Verträglichkeit in German...
    Ausgeseichnet! Danke sehr!
    CPU: Core i7 8700k, HT enabled, all 6 cores OC'd to 4.8GHz, Vcore = 1.24v
    Heatsink: Noctua NH-D15 with one NF-A15 1500 RPM PWM fan
    Motherboard: Gigabyte Z370X Aorus Gaming 7
    RAM: 4x16GB (64GB) Corsair Vengeance LPX DDR4 RAM 16-18-18-36@3200MHz, Vdimm = 1.35v
    GPU: MSI GeForce GTX 1080 DirectX 12 with 8GB 256-Bit GDDR5X
    SSD1: Samsung 840 EVO 500GB TLC; SSD2: SAMSUNG 860 EVO 1TB 3-bit MLC
    HD: WD 500GB (old); Case: LIAN LI PC-7H Aluminum ATX Mid Tower
    PSU: Seasonic Platinum 660W

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    Thumbs up

    So EMV = EMI basically

    Thanks everyone for the responses. Since everyone concurs I think I'll wrap the unit back up and sell it on ebay since it's a 1100w 80+ silver monster. I'll make a note to eyeball the caps first though.

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