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Author Topic: What component is this?  (Read 854 times)

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Offline laban93Topic starter

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What component is this?
« on: February 20, 2022, 02:27:32 pm »
Hey all. I am trying to repair a failed 24v psu, and found this fsiled component that i cannot identify. Looks like the outer casing has ruptured, and left a glass fiber voven core visible. Any ideas?  :-//
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Offline Shock

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Re: What component is this?
« Reply #1 on: February 20, 2022, 02:31:27 pm »
Looks like an axial fuse, thermal fuse.
« Last Edit: February 20, 2022, 02:33:21 pm by Shock »
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Offline laban93Topic starter

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Re: What component is this?
« Reply #2 on: February 20, 2022, 02:31:49 pm »
Added a picture of the placement in the circuit if that helps
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Offline laban93Topic starter

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Re: What component is this?
« Reply #3 on: February 20, 2022, 03:02:02 pm »
Well, i replaced it with a fuse. Then blew the top of an IC when powered up. :palm: I guess this goes in the parts bin!
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Offline Labrat101

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Re: What component is this?
« Reply #4 on: February 20, 2022, 05:44:02 pm »
It was a 5w wire wound resistor .Depending on the exact circuit it was probably 10R0 . Some China 24v units use a 2R2 . . You will have to reverse engeer a bit . The chip is probably the power correction . A little hard to see the exact from your photo .
Was that transistor a rectifier double diode . ?
« Last Edit: February 20, 2022, 05:47:06 pm by Labrat101 »
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Offline Shock

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Re: What component is this?
« Reply #5 on: February 20, 2022, 06:39:09 pm »
The IC is only a buck, you jumped ahead a little or left out what you tested. There was likely a short somewhere and might still be. I'd be diode hunting.
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Soldering/Rework: Pace ADS200, Pace MBT350
Multimeters: Fluke 189, 87V, 117, 112   >>> WANTED STUFF <<<
Oszilloskopen: Lecroy 9314, Phillips PM3065, Tektronix 2215a, 314
 

Offline Labrat101

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Re: What component is this?
« Reply #6 on: February 20, 2022, 07:00:40 pm »
I also forgot to mention if that resistor has blown for sure you have other problems . Diodes as mentioned and even the driver Mosfets or Power transistors.
If these are blown your feed back has a problem can be due to the small 4.7uf 50v go open and goes into overload and the rectifiers fail and or drive circuit.
 Without knowing the exact type or rating the PS can fail in many ways
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