The psu has initialy shorted 5vsb and few rounded caps...
I find short, there was big sb540 diode and one red small in glass no marking, from 5vsb rail to ground.
After replaced sb540 with sb560, I supose that this glass diode was zenner 5v1, so I put it there. Also replace mentioned caps. I was so confident that I put all in box...
All double checked, nowhere short is remaining, it has 5vsb and 5v ps-on now, but when power on, it briefly run (fan and voltage) and shutdown. This behaveour is repetable if again switch on. I do not use any bulb or toaster this time, nor any load.
I conserned about these glass diode, if I miss point...
Is it some changed in "modern" atx supply, say they need connection to mb or so? All before, they run naturaly when pson applied.
Any idea?
I find short, there was big sb540 diode and one red small in glass no marking, from 5vsb rail to ground.
After replaced sb540 with sb560, I supose that this glass diode was zenner 5v1, so I put it there. Also replace mentioned caps. I was so confident that I put all in box...
All double checked, nowhere short is remaining, it has 5vsb and 5v ps-on now, but when power on, it briefly run (fan and voltage) and shutdown. This behaveour is repetable if again switch on. I do not use any bulb or toaster this time, nor any load.
I conserned about these glass diode, if I miss point...
Is it some changed in "modern" atx supply, say they need connection to mb or so? All before, they run naturaly when pson applied.
Any idea?
Comment