Help needed to solder back plug of ac adapter of thinkpad

Hi

I am new here. I registered to ask a question.
Recently the plug (the part that goes in the computer) of the AC Adapter of my Lenovo ThinkPad got disconnected from the wire. It's about 50Euro to buy a new adapter and I don't think it's worth to do that if one can connect the plug back together with the wire with sime simple soldering.

So I opened up the disconnected part using a blade. The thing though is that as I was opening it, I forgot to pay attention to where each wire was connected.

Now the wire has an inner white wire and an outer wire. Normally I would guess that the inner white is the + and the other is the -.

The other thing was that on the plug there are three pins. Two of these were connected together, but I accidentally disconnected them with the blade and I don't remember how they were wired. There is the middle pin, the one around this, and the outermost one. I could find online an image of this plug:

I looked around the web to find how the plug is wired. I could find only two references. One is on this pdf, page 27. It says that the middle pin is +20Volts, the innermost pin is 0 Volts and the outermost pin is the Ground. But what does it mean when it says about the 0Volts? Does it mean that this is the -ve ?

The other reference I could find is here, see Kevin O'Brien's message. He says:

Though I don't understand exactly what he means.

Can someone help me? All I need is to know where to connect each wire on the plug, and which of the two pins of the plug should be connected with each other. In regards to which of the two pins where connected with each other, could it be that the Ground is connected to the -ve pin? Would that make any sense?

Thanks, sorry for the long message.

 

Before you go that far, let me ask --have you checked the Euro version of Ebay?

I'm thinking you might find the AC adapter for less there. With the right filter, you can narrow down the search and get rid of the knockoffs. Here's a link below.

Link

 

Do you have any more pictures to show the pins/wires?

If you don't recall how it was wired up and you can't find any helpful references, then you should buy a replacement. As Lonewolf said, check ebay. I once got a genuine AC adapter for like $12 shipped.

If you wire up the connector incorrectly or badly, you risk damaging your motherboard and that'll be even more costly than a replacement AC adapter.

 

you should not use a damage adapter. As said try ebay and get a replacement.

 

thanks.
so I'm now looking online to buy a new adapter and I found some cheaper ones (about 7 English pounds) and some genuine (about 30 E.P). And I have a couple of questions:

-Should I buy a genuine Lenovo one or can I buy a non-genuine one?

-Should I be looking for an apapter that has the same ampers, volts, or watts with my one? My one says 65W, 20V and 3.25A (output). Which one(s) of the three should be the same on the new adapter?

 

usually it is a good idea to get the genuine one, as the compatible one can short out and overheat for unknown reasons, which is not something you would want.

Power rating of the power adapter = Voltage (20 V) x Current (3.25 A) = 65 W

 

Thanks !
I managed to find a genuine one from ebay for 15 E.P. which is quite cheap. I hope it works out fine because it's my first ever buy from ebay.
Bye!