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Lenovo ID pin resistor values

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    Lenovo ID pin resistor values

    Hello, as you know, for Lenovo laptop, the AC adapters have an identification pin. They use a simple system with a resistor to ground from the ID pin.

    Here are some values for the resistors:
    65W adapter: 270 ohms
    45W adapter: 116.5 ohms (you can use 120)

    We had a T450s in with trouble recognizing adapter, due to poor quality power jack (not broken, just poor quality). Tried 3 adapters and it was hit and miss on all of them. I have disconnected the ID pin from the connector that plugs in the motherboard, and soldered a 270 ohm resistor from the connection of the ID pin to ground. Now any adapter plugged in is recognized as 65W, no problem charging the battery now.
    Originally posted by PeteS in CA
    Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
    A working TV? How boring!

    #2
    Re: Lenovo ID pin resistor values

    http://www.thinkwiki.org/wiki/Power_Connector

    I've also made a little tester for laptop chargers. Still a 1 hour prototype but one day it will be made into a real tool, hopefully this year.
    https://www.badcaps.net/forum/showthread.php?t=70627

    Oh and for some reason, some 65W chargers have resistor for 90W charger for some reason. So it's not always accurate.
    Last edited by RethoricalCheese; 08-09-2018, 03:43 PM.

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      #3
      Re: Lenovo ID pin resistor values

      so there is maybe a circuit that works out ohms law to find the wattage . or maybe 2 circuits .

      Comment


        #4
        Re: Lenovo ID pin resistor values

        You mean on the laptop side? Probably just makes up a voltage divider and uses a comparator to see if the voltage is lower or higher than reference. But I wouldn't actually know, have not looked at motherboard schematic to see what's there exactly.

        Comment


          #5
          Re: Lenovo ID pin resistor values

          Originally posted by Th3_uN1Qu3 View Post
          Hello, as you know, for Lenovo laptop, the AC adapters have an identification pin. They use a simple system with a resistor to ground from the ID pin.

          Here are some values for the resistors:
          65W adapter: 270 ohms
          45W adapter: 116.5 ohms (you can use 120)

          We had a T450s in with trouble recognizing adapter, due to poor quality power jack (not broken, just poor quality). Tried 3 adapters and it was hit and miss on all of them. I have disconnected the ID pin from the connector that plugs in the motherboard, and soldered a 270 ohm resistor from the connection of the ID pin to ground. Now any adapter plugged in is recognized as 65W, no problem charging the battery now.
          Good Workaround boss......

          Comment


            #6
            Re: Lenovo ID pin resistor values

            did anyone knows about the value of lenovo 230w charger?

            i have one with 4500ohms i dont know if its good or bad

            Comment


              #7
              Re: Lenovo ID pin resistor values

              Originally posted by starcellnindiri View Post
              did anyone knows about the value of lenovo 230w charger?

              i have one with 4500ohms i dont know if its good or bad

              |45 W |120 Ω |
              |65 W |280 Ω |
              |90 W |550 Ω |
              |135W |1 kΩ. |
              |170W |1.9 kΩ|

              the resistance raises by wattage level. next wattage would have resistance little less than 4k

              Comment


                #8
                Re: Lenovo ID pin resistor values

                Originally posted by starcellnindiri View Post
                did anyone knows about the value of lenovo 230w charger?

                i have one with 4500ohms i dont know if its good or bad
                You have the right value for your charger.
                https://www.thinkwiki.org/wiki/Power...230W_11.5_Amps

                Comment


                  #9
                  Re: Lenovo ID pin resistor values

                  Originally posted by ktmmotocross View Post
                  |45 W |120 Ω |
                  |65 W |280 Ω |
                  |90 W |550 Ω |
                  |135W |1 kΩ. |
                  |170W |1.9 kΩ|

                  the resistance raises by wattage level. next wattage would have resistance little less than 4k
                  any charger above 170w have 4.5~5 kOhms resistance.

                  Comment


                    #10
                    Re: Lenovo ID pin resistor values

                    Originally posted by tomodachi View Post
                    any charger above 170w have 4.5~5 kOhms resistance.
                    than u have 230W charger
                    https://www.thinkwiki.org/wiki/Power...230W_11.5_Amps

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                      #11
                      Re: Lenovo ID pin resistor values

                      Hi, my Thinkpad E560 can`t be powered up anymore . No LED. I changed the mainboard with another one apparently working before with all modules. Same problem. The charger is a 45W one, but the resistor has 178Ohm. I opened the connector and changed the resistor with 120Ohm. Same problem. Any Ideas? THX

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                        #12
                        Re: Lenovo ID pin resistor values

                        I even tried to put 10 0hm on the output of the charger (ca 2A) The charger can supply also 20V by 2A and seems to be OK.

                        Comment


                          #13
                          Re: Lenovo ID pin resistor values

                          Apparently isn't "certainly". Borrow another genuine charger to test. My gut instinct says you have a motherboard problem or power jack problem and the charger is fine.
                          Originally posted by PeteS in CA
                          Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
                          A working TV? How boring!

                          Comment

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