I've been using this 360w 24v DC power supply for quite a while and it's worked well. from what I can tell online it's decent we built for what it is. All the sudden today I go to use it and there is no DC output. so I do a quick search online and how to troubleshoot this type of power supply... it has 2 - d13009k NPN high voltage fast switching power transistors. I found a few tutorials on how to test npn transistors and no matter which pins I probe, my multimeter just shows "OL" overload in diode / beep mode. Even swapping red and black test leads. I am testing them in circuit. at first I thought maybe I was doing something wrong since both of them are showing the same thing. so I checked out a couple YouTube videos on checking npn transistors and there should be some readings between certain pins even when still in circuit.
so basically my main question is is it possible that something else is wrong to make me have these reading while testing these transistors? Or is it possible both of them are dead?
if you guys say that they're dead from the readings I'm getting I will replace them with some npn power transistors from a different power supply with equivalent ratings. just wanted to make sure that something else wouldn't be causing these readings and if I replace them if they'll get blown the same way...
and if you guys have any other advice exactly how to go about testing to determine what might be wrong if it's not these transistors I would appreciate it.
so basically my main question is is it possible that something else is wrong to make me have these reading while testing these transistors? Or is it possible both of them are dead?
if you guys say that they're dead from the readings I'm getting I will replace them with some npn power transistors from a different power supply with equivalent ratings. just wanted to make sure that something else wouldn't be causing these readings and if I replace them if they'll get blown the same way...
and if you guys have any other advice exactly how to go about testing to determine what might be wrong if it's not these transistors I would appreciate it.