Corsair 500R MOLEX wires broke off.

Hi guys, I have problem with power for the front panel fans.

I was cleaning my case, and both of the cables from power MOLEX broke off.

I'm able to solder them back, but I don't know what to do because both of them are black.

The molex itself has numbers on it, from left to right it will be ofcourse 1, 2, 3, 4

Power cables was soldered to number 1 and 2.

Numbers 3 and 4 are not used.

How do I know how to solder them back if they are both black?

This is not mine picture but this is the MOLEX I'm talking about.

Numbers from top to bottom are 1, 2, 3, 4.

http://i.imgur.com/vk9bB.jpg

Another picture of the MOLEX

http://i302.photobucket.com/albums/nn82/Zeign/DSC00888-1.jpg

One more info. about MOLEX I'm talking about.

http://forum.corsair.com/v3/showthread.php?t=116306

I'm able to solder them back, but I don't know what to do because both of them are black.

 

The molex itself has numbers on it, from left to right it will be ofcourse 1, 2, 3, 4

Molex pin 1 is +12 volts and goes to fan pin 2

Molex pin 2 is earth/0 volts and goes to fan pin 1

So I suspect you can figure out which wire is which with a DMM/DVM.

To me it looks line that Molex is push fit rather than soldered

In a meantime I found info. that pin 1 is +12 and pin 2 is zero.

But I'm not electronic guy, just simple user who is able to solder.

I don't have DMM/DVM.

How it is even possible that they create such a wiring!

This wires should be color coded.

Also the way this MOLEX was build is so bad.

I mean this should be well made, impossible to break.

Build quality level zero.

Anyway thank you very much for your answer.

What I have to do now?

Siple thing becomes huge problem!

I have to go with huge PC case somwhere to check which black cable is which.

I'm very disapointed.

Oh thank you so much!

I will order this today!

It looks like you have saved me!

But I don't know how to use it, could you be so kind and find me proper tutorial on YouTube so I could learn how to use it for my specific problem?

I'm good with computers, but when I have problem like this I feel like beginner who knows nothing at all.

btw. I was sure it will cost a lot of money.

It's not very hard:

1. Select continuity checking
   
2. Unplug all the Fans
   
3. Check that the two Molex end wires are not connected (they will be 'till you unplug the fans)
   
4. Check which wire goes to which pin
   
5. Once it arrives have a go and ask again is you get stuck

Thank you!

I did a quick research which one to buy.

And I found UNI-T UT33 series.

I will go for UT33C which measures also temperature.

http://www.uni-t.cz/en/p/multimeter-uni-t-ut-33c

What do you think?

3min. comparison.

[ame]

I just came back from the shop :)

I will play with it for a while, and If I have problems I will ask you for help, but I'm sure that I will have problems :D

I will start with this tutorial to learn the basics :)

[ame]

So as professional Paint artist I did this picture :)

I don't understand why I should check for "continuity" ?

I just need to know which black cable is "+12" and which black is "0" so I can connect "+12" to number "1" on the MOLEX, and "0" to number "2" on the MOLEX.

Could you tell me watching on this picture that cables are connected in the right order to the multimeter, and how I should take the measurment properly?

From what I have learned I know that "continuity" will check that the circuit is not broken.

If teh circuit is not broken multimeter will give me a sound "beep"

I was thinking that I have to set multimeter to "V- volts" and set measurmnet to 20 volts so I can measure which cable is a "+12"

What I did so far.

I connecedt multimeter to the broken black MOLEX cables.

Multimeter was set to 20volts.

Wires of the mutimeter are conected like on the piture.

First reading was 0,20 V

And when I switch the cables the reading was - 0.18 V

Sorry for this low level question but I don't know nothing about this :)

Edit:

The power supply was switched off.

http://i.imgur.com/XzgsbVq.jpg

See https://learn.sparkfun.com/tutorials/how-to-use-a-multimeter/continuity

There is no power connected to the wires that go to the front panel, so there is no voltage to measure.

You have to check which "Molex" wire the fan pin 2 goes to. This is +12.

You should also check that there is no connection to fan pin 1 and that there is no connection between the two "Molex" wires.

So I disconnect 2 connectors from the front panel fans.

But these connectors have 3 pins.

I make the picture with this connector with numbers.

So the broken black MOLEX cables are going to the number 2 and 3.

What is the use for pin number 1?

And finaly after when I know where these black cables end on the pins from the fan connectors, how do I know which pin is "+12" and which is "0" ?

Because these cables are also black :D

Anyway this is the picture :)

I'm very close to solve this riddle right? :D

http://i.imgur.com/DFxrvUm.jpg

You have the fan pin numbering inverted, see https://allpinouts.org/pinouts/connectors/motherboards/motherboard-cpu-3-pin-fan-connector/ which also specifies the other pin is the tachometer

The middle pin is +12 volts

I found this picture, number 1 is for RPM :)

I'm going to fix this now, so cool! :)

I will let you know after when it's done.

http://i.stack.imgur.com/NpPzH.png

I found this picture, number 1 is for RPM :)

No it's not. The yellow wire is the RPM and that's pin 3

No it's not. The yellow wire is the RPM and that's pin 3

I was talking about my picture, in this order will be:

Number 1 is RPM

Number 2 is +12V

Number 3 is GND

Anyway it's working now, I'm very grateful for your help, thank you so much!

Without you for sure I would never fix it!

I have one more question.

Ihave noticed that pin number 3 on my picture is not connecting well.

But it's impossible to see how it is build, I want to remove this pin and fix it.

Any chance that you know how to remove pin from this connector?

http://i.imgur.com/DFxrvUm.jpg

Your numbering scheme is silly and likely to cause confusion. There is a standard for numbering fan header pins which you should obey.

I suspect trying to fix it would be a waste of time. I would get similar to http://www.ebay.co.uk/itm/191360643764 or http://www.ebay.co.uk/itm/272140221379 get my soldering iron out and replace the entire socket.

It's silly because the connector on the picture is reversed :)

Unfortunately the connectors you advice will do not work with the corsair cooler connectors.

Corsair create them the way that they do not fit with standard connector.

I don't get this...

I had to remove connector from the front panel and also from the cooler.

You know what, I will try to find quick connectors for this.

You know the one without soldering.

Anyway thank you, you save me a lot of trouble! :)

Also I have learn a bit about multimeter, I'm sure it will be helpful in the future! :)