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Thread: PC PSU "repair" (it starts but shuts down after 1 sec)

  1. #21
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    shottky 3 A/60 V

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    If this is not the only occasion that your apt has has bad power you should consider getting a UPS and interposing it between your PSU and the mains.
    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

  3. #23
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    @Behemoth thank you, i was about to ask what are the parameters of this, diode, Schottky Rectifier. I found a pdf from Vshay and Fairchild, you are right.

    SB360 MAXIMUM RATINGS:
    Maximum repetitive peak reverse voltage: 60V
    Maximum RMS voltage: 42V
    Maximum DC blocking voltage: 60V
    Maximum average forward rectified current: 3A
    Peak forward surge current 8.3 ms single half sine-wave superimposed on rated load: 120A(Vshay) 80A(Fairchild)

    @ehume i agree with you, getting an UPS will be on my list. The other devices(refrigerators,tv,etc are stil alive). The problem was inside the Belkin device only.
    I will find a way to create a G-line(protection line). It is too risky without it.

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    Dunno, I think the problem was in your installation, most likely in the very socket. The voltage could have appeared from both the overvoltage protector, or from the PSU itself. I am quite sure having working grounding is condition to use the protector.

    The only way to add grounding is to pull the old installation from your walls and make a new one. For whole flat or building, that requires a project and revision afterwards, the exact stuff depends on your country. Prepare for expensive and long operation.

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    update:

    i have replaced(temporarily) the dead diode SB360 with an old diode 1N5844 and the PSU is alive i only started it for less than a minute. I am aware that 1N5844 is not equal to SB360.

    I have measured the EPS 12V atx and i get +12V reading.
    I also quickly measured a MOLEX and i have +5V(red wire) and +12V(yellow wire)
    The PSU FAN is spinning, of course. Tomorrow i will buy the SB360 Diode and test it in LOAD. So far i dont know for sure if it will run when connected to the mainboard(pc).

    I cant believe it. it's aaliveee...

  6. #26
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    It's 5amp so that's OK, question is if 40 V is safe enough.

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    Just schottky (fast recover diode ) is acceptable.

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    Quote Originally Posted by asf14tomcat View Post
    Just schottky (fast recover diode ) is acceptable.
    So it doesnt matter if i cant find exact SB 360 ? If the electric store has SB 380 schottky diode, my PSU should be fine? So should i ask for "Just schottky (fast recover diode )" ?

    And another question. I have attached photo with the area where i have replaced the MOSFET. But i couldnt find an identical FDPF13N50Z, so i replaced with a FQP13N50. I think the Vgs differs a bit and RDS(on) is a bit different.
    Should this be a problem for my PSU?

    thank you.

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    Schottky at least 3 A and 60 V. Plus the size matters of course, you most likely won't fit bigger one as also the electrodes will be thicker than the hole.

    As for the transistors, will be beter to use two from same manufacturer and same date.

  10. The Following User Says Thank You to Behemot For This Useful Post:

    minus0 (02-13-2017)

  11. #30
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    Thank you Behemot and thank you asf14tomcat. I will post new update later in the evening when i get back home. I will keep in mind your recommendations.

    Soldering the new diode will be a challenge, since it is impossible to re-fit the diode beneath the coils. It was very difficult for me to take the dead diode out, it is kind of big, but even if i find one smaller, i cannot put it back, not even on the back side(not even with the pins cutted). i really dont want to mess with the coils.

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