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Question to DIYers!!!!

post #1 of 25
6/3/12 at 5:55pm
Thread Starter 
There is a keyboard i want to buy that is marked down considerably due to a problem with the ps/2 connector. Basically its broken beyond repair and i was wondering if anyone knows of a place to buy the connector so i can just solder that on and maybe a schematic i could follow? Also would i still get all the functions from the laptop, N-key rollover, LED?
 
Im thinking about buying a ps/2 extension cord and opening it up and see if i could figure it out and also just that piece.
 
Thanks,
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post #2 of 25
6/4/12 at 11:01am

http://lmgtfy.com/?q=6+pin+mini+din+connector

 

and

 

http://en.wikipedia.org/wiki/PS/2_connector

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post #3 of 25
6/4/12 at 11:39am
Thread Starter 

Yes.....

 

Anyways,  How would i know which wire is which? 

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post #4 of 25
6/4/12 at 12:40pm

Couldn't you look at the old connector and see what wires are soldered to what pins?

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post #5 of 25
6/4/12 at 7:39pm

It's probably a molded connector...

 

If you just want to hack off the connector you'll need a multimeter to ring out which pins go to which wire.  You could also just get an extension cable cut off the female end and solder those lines to the circuit board in the keyboard, that is, if they're soldered and not connected to a pin header, in which case you could remove the pin header and solder the new cable right to the board.  You'll still need to ring out the lines because you can't trust anyone to stick to any type of standard.

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post #6 of 25
6/4/12 at 10:21pm
Thread Starter 

Quote:

Originally Posted by MisterX View Post

Couldn't you look at the old connector and see what wires are soldered to what pins?

That is what I was planning on doing but was just wondering if there was a better way,

 

Quote:
Originally Posted by samsquanch View Post

It's probably a molded connector...

 

If you just want to hack off the connector you'll need a multimeter to ring out which pins go to which wire.  You could also just get an extension cable cut off the female end and solder those lines to the circuit board in the keyboard, that is, if they're soldered and not connected to a pin header, in which case you could remove the pin header and solder the new cable right to the board.  You'll still need to ring out the lines because you can't trust anyone to stick to any type of standard.

I got everything except the last sentence about the lines. Could you clarify?

Great Idea, I feel that would be much easier and efficient than trying to attach something mid cable if that makes any sense.

 

Thanks!


Edited by johnman1116 - 6/4/12 at 10:26pm
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post #7 of 25
6/4/12 at 11:07pm

That means there is no standard to you the green wire is the clock, the white wire is the data, the red wire is VCC and the black wire is ground (like there is for USB).

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post #8 of 25
6/5/12 at 7:24am
Quote:
Originally Posted by MisterX View Post

That means there is no standard to you the green wire is the clock, the white wire is the data, the red wire is VCC and the black wire is ground (like there is for USB).

 

No, it means I've dealt with a lot of premade cables that don't pay attention to standards when they make their cables.  You can't trust anyone to follow standards, it's always a good idea to meter the cable and make sure.

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post #9 of 25
6/14/12 at 5:44pm
Thread Starter 
Quote:
Originally Posted by samsquanch View Post

 

No, it means I've dealt with a lot of premade cables that don't pay attention to standards when they make their cables.  You can't trust anyone to follow standards, it's always a good idea to meter the cable and make sure.


Well I can vouch for that. I have run into problems. First, I couldnt get measurements of the broken ps/2. All the contacts were gone.... Also, there are only 4 wires plus ground for the 6 pin connector. The extension that I bought a CablesToGo extension and it has 6 wires plus ground. And yes, none of the colors match....

 

help. qq

by ground is mean the bare wire.

 

 

broken cables: dark blue, light blue white pink. 

extension: green, blue black red yellow oj

 

QUESTION: If i "accidently" hook up to the wrong wire, would anything blow up or something bad happen? Not sure how else i could test it.


Edited by johnman1116 - 6/14/12 at 6:05pm
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post #10 of 25
6/14/12 at 6:59pm

replied to your pm, but ill put this here as well

 

http://en.wikipedia.org/wiki/PS/2_connector

 

2 of the wires are not connected to anything, so you are probably fine. if you have a meter, you can see which one is which, or if you take apart your keyboard, you can see if it says anything on the board about which is which ( you should at least be able to figure out which is ground and + pretty easily by eyeballing the circuit board reguardless of silkscreen)

 

if you can figure out which one is vcc (or +) and put it in the right place (pin 4), you can mess around with (try all combinations of) the other wires without risk of frying anything

 

also, you say 4 wires + ground, it is more likely 4 wires + shield, which you can just connect to the metal circular part. one of the "4 wires" is the actual ground (pin 3)

 

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post #11 of 25
6/14/12 at 7:01pm

Is the circuit board of the keyboard, where the original cable attached labeled in any fashion?  Maybe take a picture of it?  You can pull up a pinout of a ps/2 connector on the internet pretty easily, at that point you can meter through the connector to see which wire is hooked to which pin, take the four wires you need and solder them to the appropriate points on the board.

 

This wikipedia page has a nice diagram and pin out of a ps/2 connector.  http://en.wikipedia.org/wiki/PS/2_connector

 

You could damage something if you miss wire this.  Chances are probably pretty low, as I assume the data and clock signals operate at 5vdc, but it's really not worth chancing.

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post #12 of 25
6/14/12 at 7:05pm
Quote:
Originally Posted by pistolsnipe View Post

if you can figure out which one is vcc (or +) and put it in the right place (pin 4), you can mess around with (try all combinations of) the other wires without risk of frying anything

 

 

 

I'm sorry but this is bad advice, feel free to "mess around" with your own things, but please do not advise other people to do so, it's rather careless.  Yes the chances of damage are low, but are you willing to paypal him money if this tactic fries his keyboard?

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post #13 of 25
6/14/12 at 7:41pm

The pins on the plugin side of the connector might be broken off but the back parts will still be there.

 

If you cut away from the side of the connector ( Along the metal barrel) you should be able to peel away the white plastic.

The back of the barrel where the wires are soldered to will have a different plastic molded around it.

You might be able to see where the wires are connected to through that plastic.

 

Plastic cut off, Barrel pried open, hold the connector to the light to see which colour goes where.

USE a meter on you new cable, do not cut up the connector. :)

 

PS/2 Connector

 

The extension has all six wires hooked up for connecting to a dual PS/2 system

http://pinoutsguide.com/Inputs/ps2_promPC_pinout.shtml

 

You will only need 4 plus the shield to the barrel...

 

Hope that helps


Edited by TrollDragon - 6/14/12 at 7:43pm
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post #14 of 25
6/15/12 at 6:30pm
Thread Starter 
Quote:
Originally Posted by TrollDragon View Post

USE a meter on you new cable, do not cut up the connector. :)

IMG_20120615_180601.jpgIMG_20120615_181428.jpgIMG_20120615_183244.jpg

 

ps/2 splits to ps/2, usb, mic, 3.5 stereo. 

I emailed the customer service and asked if they could tell me which wire was which but they havent replied back.

btw this is a ione x-armor u9bl

 

IMG_20120615_184037.jpg

This is from the ps/2 extension and ps/2 to usb converter.


Edited by johnman1116 - 6/15/12 at 6:42pm
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post #15 of 25
6/15/12 at 7:09pm

Here we go...

 

The Cypress Chip on the board uses Pin 1 and 2 to emulate PS/2 Data and Clock.

Data Sheet http://www.cypress.com/?docID=24630

 

Pin 1 & 2 looks like they connect to the two blue wires through  R3 & R4 (as best as I can tell from the picture) You can verify with a meter.

That would leave the light red and the white. My guess would be that the light red is 5V and the white is ground.

This you can also verify with a meter. If the white wire connects to the ground on the circuit board anywhere then by logical deduction the light red would be +5.

The two blues are PS/2 clock and data if they get hooked up in reverse it will not cause damage, just the keyboard will not work or the computer will hang at the post screen.

Reverse them if this happens and you should be good to go.

 

I'd loose wire this up for testing before you solder it all in place.

 

You will have to meter your extension to find out which wires go to the +5 Data Clock and Ground pins.

The bare copper connects to the barrel (Shield)

 

Hope this helps!

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