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Need help figuring out how to wire this PSU molex on/off switch


NadeMagnet
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Running an old Corsair TX650 PSU mounted under my desk to power some LED behind my monitor and TV, and some desk fans in the summer. Using 2 Lighting node pros and an Anidees fan hub. All three are sata powered. But rather than having to reach down under my desk to power off the PSU every time I want to shut them off, I wanted to run a switch to my desktop next to the keyboard to do the job. So I bought this https://www.performance-pcs.com/diy/switches/switch-accessories/4-pin-molex-power-adapter-cable-w-remote-on-off-toggle-switch-36-sleeved-gc36ps44.html

and this to run to the 3 items. https://www.amazon.com/gp/product/B009GULFJ0/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1

 

How that switch is pinned won't work for what I need it to do. If I try just the fan hub plugged in alone. With the switch on, the fan LED and the fans spin up to full power like they should. Shut the switch off, and the LED shut off, the fans loose most of the power. But still are getting enough to run minimally. So power is leaking by somehow. If I try the fan hub and both LNP or just 1 LNP. Then neither the fan LED nor any of the LED strips attached to the LNP will shut off at all. As best they merely dim and with all 3 I can't even tell if the fans slow. So obviously this switch isn't pinned how I need it to be. This is a pic of how the switch is pinned with their pin layout.

https://imgur.com/a/DTSppK2#0brWQvy

I don't understand how it's wired at all. They have the switch itself which is the long cable that goes out of the pic's frame, wired to the grounds. So how do I rewire this so I can keep the PSU on and shut off the 3 items with the switch? Both the fan hub and the LNP are 5v items so I don't need the 12v.

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When you say you want to keep the PSU on, you mean it has to power other things while the lights are off?

 

Or do you mean you don't want to have to flip the switch at the back of the PSU to turn the lights off?

 

if you mean the second, there's an easy fix to power it completely off through the 24 pin cable :

https://www.amazon.com/CRJ-24-Pin-Switch-Jumper-Sleeved/dp/B01MSY4966/

 

From the pin layout you showed they do switch off grounds indeed , to turn off power.

But since LNP uses both 12V and 5V rails as well as ground, when you cut the ground you end up with a funny situation.

grounds are common, and you still feed it +12V and +5V. So it ends up being powered by the voltage differential, that is +7V.

Edited by LeDoyen
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When you say you want to keep the PSU on, you mean it has to power other things while the lights are off?

 

Or do you mean you don't want to have to flip the switch at the back of the PSU to turn the lights off?

 

if you mean the second, there's an easy fix to power it completely off through the 24 pin cable :

https://www.amazon.com/CRJ-24-Pin-Switch-Jumper-Sleeved/dp/B01MSY4966/

 

From the pin layout you showed they do switch off grounds indeed , to turn off power.

But since LNP uses both 12V and 5V rails as well as ground, when you cut the ground you end up with a funny situation.

grounds are common, and you still feed it +12V and +5V. So it ends up being powered by the voltage differential, that is +7V.

 

The second. I wanted to just leave it on. It's such a low power requirement that the PSU fan won't even spin except when I first turn it on.

 

Oooooh I thought they were just using 5v. So you think that switch will work for me? I was just jumping the 24pin with a paper clip on the 4th and 5th pins to get it to turn on. I thought I'd have to sever the power on the molex connection itself. That switch will turn on the PSU and still send power to the molex cables with just 3 wires?

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it is the contact that the motherboard clicks closed when you push the power button on your computer case. It turns on and off all voltage rails, so that's the proper way to switch the PSU on and off.

 

you'll just have to connect the LNP normally, no modifications needed yea

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