Lenovo ID pin resistor values

[Th3_uN1Qu3]

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.

[RethoricalCheese]

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.

[petehall347]

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 .

[RethoricalCheese]

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.

[mcplslg123]

Re: 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.

Good Workaround boss......

[starcellnindiri]

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

[ktmmotocross]

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

|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

[JaroTech]

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

You have the right value for your charger.
https://www.thinkwiki.org/wiki/Power...230W_11.5_Amps

[tomodachi]

Re: Lenovo ID pin resistor values

|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.

[ktmmotocross]

Re: Lenovo ID pin resistor values

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

[nebv]

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

[nebv]

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.

[Th3_uN1Qu3]

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.

[tarum2003]

Hii..
What should be the resistance value for a 300 watt adapter?

[tarum2003]

I found..
thnk. VUSAL expert
8.6KOHM

[mon2]

You have a 300 watt adapter?? How big is this thing??