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

  1. #11
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    Please remember that i am not an electrician and english is not my native language, so i apologise if i missunderstand you.

    The Belkin was delivering voltages between ALL POINTS: (see photo)

    L - N = ~230V
    G -N = ~200V
    as far as i know, thats not normal. The Belkin has a PCB inside with rezistors, capacitors, etc. When it damaged, it started to deliver ~200V directly into G line(protection line) But the apartment doesnt have a protection line, so those ~200V remained inside my PSU.
    This thing was confirmed by an electrician. I wanted a confirmation of my story(you know, to be sure) so he told me that the Belkin damaged my PSU. He confirmed what i have assumed it happened.

  2. #12
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    Yeah well are you sure the ground was connected all right in the socket? If not, that's one of failure conditions with TN-C, you get phase voltage on the ground and also casing which is life hazardous.

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    Quote Originally Posted by Behemot View Post
    Yeah well are you sure the ground was connected all right in the socket? If not, that's one of failure conditions with TN-C, you get phase voltage on the ground and also casing which is life hazardous.
    i am not using the Belkin anymore, even if i modified it inside bypassing the pcb(damaged).
    What were you saying about measuring -12V and GND ? Were you reffering to measure in diode mode, the BLUE wire( -12V) and GND(black wire) ?
    my DigitalMM shows the value 001 between BLUE wire(pin14) and Black wire(pin15).
    Is that what you meant? or i missunderstood?

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    Just measure resistant use ohm mode. If it have short-circuit. Lets replace the short componenst ( single diode rectifier maybe )

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    Quote Originally Posted by asf14tomcat View Post
    Just measure resistant use ohm mode. If it have short-circuit. Lets replace the short componenst ( single diode rectifier maybe )
    Blue(-12V) and Black(GND) = 2 ohm

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    Quote Originally Posted by minus0 View Post
    Blue(-12V) and Black(GND) = 2 ohm
    Double check . change black and red wire from DMM and measure. If boths ways have same number. It short . replace the rectifier diode
    Btw 2ohm is very small. Like a short-circuit

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    Quote Originally Posted by asf14tomcat View Post
    Double check . change black and red wire from DMM and measure. If boths ways have same number. It short . replace the rectifier diode
    Btw 2ohm is very small. Like a short-circuit
    Thank you. I will double-check the resistance and i will also check the secondary stage for diodes.

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    The -12v rail is very small current so some time they use 7912 negative regular IC. Some time they use a small single schottky diode no need heatsink like another rails . in your psu I think they use a diode . It solder in DC ouput capacitor area. Lets find via circuit line is more quickly

  9. The Following User Says Thank You to asf14tomcat For This Useful Post:

    minus0 (02-12-2017)

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    Quote Originally Posted by asf14tomcat View Post
    The -12v rail is very small current so some time they use 7912 negative regular IC. Some time they use a small single schottky diode no need heatsink like another rails . in your psu I think they use a diode . It solder in DC ouput capacitor area. Lets find via circuit line is more quickly

    FOUND IT !

    there is one big diode, when i measure it it shows 001 in both ways
    there are other 2 small diodes.(they show infinite one way and 526 the other way)

    i will try to take a photo. The DIODE is hidden underneath the coil. I will try to desolder it, and measure out of the circuit. This sounds too easy, i am not that lucky. Once again thank you and i will post new data after i desolder the "bad" diode

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    The Diode is dead, indeed. It shows 001 in both ways.

    Diode model:
    CT 1191
    SB 360

    Sorry it took me so long to desolder it, my 100W desoldering gun wasnt so helpful.
    I cant belive i missed this diode, it was hidden under two coils, and when i tested it first time, i thought i was getting a 001 reading because of the coils.

    i wil try tomorrow to buy a new diode and give it a new try...

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