When getting this type of message from my main power supply it is a bad day:
The reason was not over-temperature!
Speaking about PSUs, see anything suspicious:
Damn HKJ I hope you figure it out!
There is a ding on the second fin of the heatsink :bigsmile:
Transistor with air intake, that is not a good situation, but you know what to replace.
I do not really have time to try fix it now and I do not know if I can.
The power supply is a high power mains switcher, this means you have to be very careful when working inside it.
[/quote]
HaHa! “Air Intake” indeed! 
Direct cooling 
My computer over heated last year after 5 years of faithful service. It had a 5 year layer of dust on it when I opened her up. She runs much better clean now. Also added a fourth fan that helped a lot as the graphic card with fan and the cpu with fan just seemed to cook each other being so close together. Extra fan is just for sucking out the towers heat. Good luck on you quest. 102 out side right now, 39 to the rest of the world.
Computers power supplies are very compact and can easily run hot, especially with a lot of dust in them (I do sometimes vacuum pc power supplies and cpu coolers).
The above power supply was idle when it happened and no amount of rest and power cycling fixed it. The power supply will also turn some fans on if it gets warm, but it is seldom I need to really let it work (Testing a led/driver at 10A is only a bit above idle for that power supply).
Sorry to hear that HKJ.
It's probably something you can't fix yourself. How much would a replacement cost?
That will have to be seen, I have never been very good at fixing electronic (Except my own designs) and I am a bit scared with the power levels in that PSU.
I did find a service manual: http://www.farnell.com/datasheets/319866.pdf but it is not exactly the same version of the power supply.
Not more than I can pay. I have ordered a smaller supply for now, it is supposed to arrive later this week. Then I hope to spend some time to see if I can fix the big supply or if I need a new one.
Good luck on that one,, keep us posted!
HKJ based on your comments it appears to keep the unit free of dust which is a good thing.
Hopefully you can work out your issue.
HV work is the same as low-V work, the only difference is the sparks are bigger :bigsmile:
Don’t replace just the bad part, but also it’s partner beside it. Also take a drinking straw, stick it in your nose, and sniff the other components individually. If it smells burnt, replace it. If it has a partner, replace both. Use exact replacement parts, if you can’t get that info from the component itself look it up on a schematic. After removal, place the new component in and install the heat-sink hardware with thermal paste under it. Clamp a pair of hemostats on each lead as you solder it to dissipate the heat. When done, give it a try; with luck you’ll be back in business and you’ll have saved $200 in benchtime charges for the factory to do the repair. If it doesn’t work you’re only out maybe $20 for the components you bought from Mouser Electronics and the factory can still fix it for you.
This is a darn sight easier to work on than the SMD stuff found in flashlight drivers so go for it and you’ll be glad you saved yourself a $200 bill for $20 worth of components to make it go again.
Phil
Sometimes the capacitors go bad in the power supply. I have fixed several CRT monitors, and arcade games by putting in new capacitors. It may not be your problem, but they are often cheap and it’s a good place to start.
time to open it up and have a look.
and Sirius9 yours has 2 ventilated transistors!
expect damage to whatever drives the bases/gates.you would have heard that failure!
Aaa, first one to notice :bigsmile: Yes, the second one is just about ready to pop
I will see if I have time for that later today and after studying the service manual I have a few voltages to check around that temperature sensor.
The problem with working inside it is that there are mains voltages everywhere, even when the power switch is off and if a probe slips I might also get ventilated transistors and maybe loose a probe tip.
The small usb power supplies has the same voltage levels, but they are usual on the safe side of a isolation transformer and the energy levels in them are small.
Damn. If HKJ can’t fix it, its probably good for the trash can