Low voltage the nothing

robgest

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OK, this is my issue. My switching power supply seems to work great until I turn it up past 11.5v. As sson as I hit 11.5v the thing shuts down and I can't figure it out. I thoought it was the 5k pot but its not. I also know I will hear a bunch of people say throw it away and get a new one "its only $20" but thats the problem with the world and why we have so much shit in our landfills. (Sorry for the soapbox moment)
Does anyone have any idea what I should check?
Thanks
 
What are you turning up past 11.5v? If you are trying to get the +5vdc line to output 12vdc then the power supply is doing it's job and shutting down.


The +12vdc (and -5vdc for that matter) are normally unregulated in a switcher. They just need to be in the general range of the required voltages in order to work properly. The only voltage that needs to be adjusted is the +5vdc, unless one of the others is way out of spec.
 
OK, guess you are right, never put the two together. My new problem then is, why can't I get 12v? LOL

It could be failing caps or failing power regulator in the +12vdc line. What does your 12v line read when you have the 5v line dialed in? As long as it is above 9v (and below 15v) you should be fine.
 
OK, at 5.2v im getting -3.6v and 10.4v. If I go up it kicks itself out. Problem is, when I hook it up to the game it will work for a few minutes and then the supply will shut down.
 
Then the power supply either needs to be rebuilt or replaced. Of course, it is possible that the power supply has cold solder joints that are heating up and breaking the circuit as well. Ken Layton wrote up a few repair guides for specific switching power supplies and they are here: http://home.comcast.net/~mtpacifico/_kenskorner/kenskorner.html

None of these power supplies are very complicated and most use the same parts.
 
OK, at 5.2v im getting -3.6v and 10.4v. If I go up it kicks itself out. Problem is, when I hook it up to the game it will work for a few minutes and then the supply will shut down.
What brand Of supply is it ? Is it similar to a tekbuilt? the normal black switcher with the screw terminal ?
 
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