My pc100 does not start

[Drack]

Re: My pc100 does not start

It is a kia339p I have a aZ339p and utc339 on the shelf

[CapLeaker]

Re: My pc100 does not start

sounds like the PWM is dead and a major event has happened. As stj already said, that usually goes with something blown up in the primary. However since you have 160V on the main filter cap, the FET should be o.k. What is printed on the PWM?

[Drack]

Re: My pc100 does not start

It's a plastic sheet stj, the camera makes it look metallic

[PeteS in CA]

Re: My pc100 does not start

That 90 ohms from +3.3V to ground might be a 91 ohm (or 90.9 ohm) preload resistor. That's a flyback (probably discontinuous) design, and such designs often need some preload. The dissipated power would be about 1/8W, so a 1/4 watt resistor would be easily adequate.

[stj]

Re: My pc100 does not start

the optoisolator looks like it had a flashover at the end facing the metal shield!

[Drack]

Re: My pc100 does not start

There is 5vsb and when I turn the PSU on, it would shut itself off after half a second

[Drack]

Re: My pc100 does not start

No, they are not, but i measured the primary cap and only 160v DC are coming

[stj]

Re: My pc100 does not start

if it blew the fuse, it probably has shorted primary transistors.

[Drack]

Hi guys it me, again... My PSU don't want to start, it has 5vsb, I already took the mov out and changed the fuse because both blew out, I think the 3.3v rectifier (cep603al) is dead because I can read 90 ohms of resistance between orange and ground, when I took out the rectifier, the short went out