Id the sense wire on 12v pc psu

Yann's picture

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Joined: Aug 29, 2020

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Id the sense wire on 12v pc psu
August 29, 2020 - 12:33pm

Hi, new here, fairly new to electronics. I found a led tv on the tip and thought it's an opportunity to learn stuff. So far it seems the power board is no good. Some tiny diode seems no good as well as a mosfet. No doubt there are other components that are no good. Blown fuse. I find my skills and tools so far are not enough to be confident in being able to repair the board. Ive got a pc 12v psu to provide 5 and 12v and figured if I can wire 2 12 pc psu's together i can get 24v. On a site ( https://www.acopian.com/acopianPowerSupplies/entry.aspx?nsid=17 ) is a diagram. Is this applicable to a pc psu and if so how to know which wires are sense + and - ? Also is the 'reverse biased diode' enough name to know what diode to use.

Sourav Gupta's picture

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Joined: Feb 12, 2018

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Well, the reference article is ok for isolated output power supply. Unfortunately, (I am not sure) my best guess are that the two or three 12V wires are not isolated, rather they are connected in the same 12V rail. I think, it is not possible.

Could you share the image of the LED TV psu board. What is the least condition? How you get to a conclusion that the diodes and mosfets are all bad?

marry roser's picture

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Joined: Nov 21, 2019

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Not all power supplies have sense wires, but most do atleast have a sense wire for the 3.3v rail. Also, most power supplies that have a 5v sense wire, but no 12v sense wire are still moddable.

jaksonlee's picture

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Joined: Nov 07, 2019

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Not all power supplies have sense wires, but most do atleast have a sense wire for the 3.3v rail. Also, most power supplies that have a 5v sense wire, but no 12v sense wire are still moddable.In this situation, modding the 5v sense wire will a vast majority of the time mod the 12v rail as well.