Antec SL-400 5vsb Mod with NCP1200

[everell]

Re: Antec SL-400 5vsb Mod with NCP1200

^Agreed +3. I am having a similiar problem with my Bestec

[kaboom]

Re: Antec SL-400 5vsb Mod with NCP1200

If it's powered up again, it'll probably be unstable now for the same load it was stable at before it overheated. If the transformer is unwound, the wire varnish will at least be darkened, possibly cracked.

Also, if there's no, or a too-low value, resistor feeding the aux supply limiter zener (tertiary/line side), said zener could be bad.

[LDSisHere]

Re: Antec SL-400 5vsb Mod with NCP1200

I probed around the supply tonight and I did not find any points of failure I could identify so I decided to power it on an see what would happen. I just had my standard ATX tester connected to it along with my DMM for voltage reading. Much to my surprise it worked, with a reading of just over 5.1V, (I do not remember what the last two digits were.)

It does appear that the waveform on the secondary diode has significantly changed. So the theory about the transformer being damaged my be correct, it just may have been pushed too far. If this is the case I am not really surprised, the only thing that surprises me is that it did not happen sooner.

It looks like it could be time for someone to learn how to wind a transformer.

[ben7]

Re: Antec SL-400 5vsb Mod with NCP1200

I probed around the supply tonight and I did not find any points of failure I could identify so I decided to power it on an see what would happen. I just had my standard ATX tester connected to it along with my DMM for voltage reading. Much to my surprise it worked, with a reading of just over 5.1V, (I do not remember what the last two digits were.)

It does appear that the waveform on the secondary diode has significantly changed. So the theory about the transformer being damaged my be correct, it just may have been pushed too far. If this is the case I am not really surprised, the only thing that surprises me is that it did not happen sooner.

It looks like it could be time for someone to learn how to wind a transformer.

If your going to wind your own transformer, you might as well make your own smps, with pcb... xD

There are plenty of things online that are about designing smps transformers

[LDSisHere]

Re: Antec SL-400 5vsb Mod with NCP1200

I finally got around to hooking up my ring tester to the 5vsb transformer. It only went up to three red LEDs so I think the transformer must be damaged. Well this is not surprising considering what I was trying to do.

A couple of weeks ago I tore apart a 5vsb transformer from a scrap supply just to see what it would take to rewind one. Well lets just say I have better things to do with my time and I will wait until I can find a another Antec supply from which I can scavenge the 5vsb transformer.