Phoenix Contact 24vdc 40A power supply repair

[bigone5500]

I got a power supply from work out of the recycle bin. This is the one I have. I connected 110v to it and there is no voltage on the output side. I will take it apart and do some testing to see what I can find. I have taken it apart once but just to see if the fuse was good and it was. I think this unit retails for around $900 so I think it would be worthwhile to repair if possible. I did a quick look over and found that the small filter caps on the output are swelled. I am wondering if the transformer on that side is bad. The caps are 35v 1200uf and there are 4 of them. The large caps look to be ok. They are 420v 390uf.

I am starting this thread for reference. I also would like input for what to look for and tips on troubleshooting these things. I do know that when working with this type of equipment that safety is paramount. Large caps can hold charge for a long time and are lethal.

 

[davenn]

highly unlikely that the transformer would have failed

caps and semiconductors would be the first choices

 

[Minder]

That is a SMPS type, so I would check the large semi conductors for a start, replace any bad looking caps.
The transformer is a switch mode type and a shorted turn is a possibility.
M.

 

[bigone5500]

Took it apart and found another component that I think may be bad too. There is some smoke around it and the solder joint looks iffy too.

 

[davenn]

yeah seriously dry jointed and have been arcing

 

[bigone5500]

This is the component that has the iffy solder joint:
http://www.infineon.com/dgdl/Infine...n.pdf?fileId=db3a304412b407950112b42dd6a14900

What is an easy way to test this component? Am I correct in that I will need 3v to operate the gate? I found this video showing how:

.
I assume that it will pertain to this component too.