Sign in with
Sign up | Sign in
Your question
Closed

2 pin and molex pwr led

Last response: in Components
Share
December 17, 2011 6:49:17 PM

I'm building my computer and I'm confused about the power led leads. I connected all the leads to the correct f_panel pins on the mobo (including -p led and +p led), but there's a molex connector labled "pwr led" from the front panel. My psu has 3 female molex connectors also. What am I supposed to do with the pwr led molex? Just leave it?

More about : pin molex pwr led

December 17, 2011 6:55:11 PM

hayden1911 said:
I'm building my computer and I'm confused about the power led leads. I connected all the leads to the correct f_panel pins on the mobo (including -p led and +p led), but there's a molex connector labled "pwr led" from the front panel. My psu has 3 female molex connectors also. What am I supposed to do with the pwr led molex? Just leave it?

Also, the two fans that came with the case each have a female and male molex in addition to a 3 pin connector.
a c 126 ) Power supply
December 17, 2011 7:45:13 PM

For the front panel of a case, you will usually have two led wire pairs. One for the hard drive activity, and the other for the power on state light. One should be labeled PWR LED and the other HDD LED. When you connect them up, the +/- polarity matters. If you get them backward, the led will not light, but no harm is done. Just reverse them.

Fans often come with two different connectors. A 4 pin molex connector, and a 3 pin smaller motherboard fan connector. You can use either, but only one at a time.
If you use the 4 pin molex connector, the fan will run at full speed all the time. If you plug the three pin into the motherboard, the fan speed can be monitored and controlled y software such as speedfan.

The purpose of both a female and male connector on the fan is so you can daisy chain them to a single molex power lead from the psu.

Related resources
December 17, 2011 8:08:51 PM

2417748,3,120121 said:
For the front panel of a case, you will usually have two led wire pairs. One for the hard drive activity, and the other for the power on state light. One should be labeled PWR LED and the other HDD LED. When you connect them up, the +/- polarity matters. If you get them backward, the led will not light, but no harm is done. Just reverse them.

Fans often come with two different connectors. A 4 pin molex connector, and a 3 pin smaller motherboard fan connector. You can use either, but only one at a time.
If you use the 4 pin molex connector, the fan will run at full speed all the time. If you plug the three pin into the motherboard, the fan speed can be monitored and controlled y software such as speedfan.

Would this work:
Plug in the male end of a fan molex to the female molex of the PSU cable.
Plug another fan (3 pin) into a 4 pin slot on the mobo and connect that fan's molex with the pwr led molex.

I just don't know what to do with the pwr led molex or if I even need it.

Best solution

a c 126 ) Power supply
December 17, 2011 9:27:22 PM
Share

The pwr led wires go from the front panel power led to the motherboard front panel switch array which will also contain the pwr, reset, and hdd led pins.

Molex to me means the fat white 4 pin lead which is abouut an inch wide, either from the psu, or to a peripheral such as a fan, or some older hard drives.

In general, you do not need any led connectors at all. If there is a led that does not light up when you think it should, then that is the one you are missing.
December 17, 2011 10:58:52 PM

geofelt said:
The pwr led wires go from the front panel power led to the motherboard front panel switch array which will also contain the pwr, reset, and hdd led pins.

Molex to me means the fat white 4 pin lead which is abouut an inch wide, either from the psu, or to a peripheral such as a fan, or some older hard drives.

In general, you do not need any led connectors at all. If there is a led that does not light up when you think it should, then that is the one you are missing.

Ok, thanks! I think we're talking about the same thing, only mine are black.

When I turned it on, it came on but turned off after a second, turned back on, then off, etc. I'm going to start a new thread for that now.

Thanks!
--Hayden
December 30, 2011 7:12:04 AM

Best answer selected by hayden1911.
!