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7 Posts

08-19-2020

Poland

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Lenovo Legion smaller charger -> 90W, 135W or 170W?

2020-08-19, 19:13 PM

Hello, I recently bought a Legion Y540 with 230W charger. I have several other chargers from older models (45W, 90W), but nothing happens if I connect them to the laptop. The "charging" diode becomes orange, but system doesn't recognize the charger and it behaves like unplugged. I read here:

https://forums.lenovo.com/t5/Gaming-Laptops/Y540-15IRH-does-not-charge-at-all-with-lower-wattage-power/td-p/4547917

that in the past the usage of smaller wattage chargers was allowed. It is possible to change properties of the notebook and use them? The Lenovo Vantage shows, that the device uses 20-40W when surfing on the internet, so a 90W charger should be sufficient to do simple tasks.

If not, which chargers are allowed? Will the 135W or 170W version work?

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7 Posts

08-19-2020

Poland

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Re:Lenovo Legion smaller charger -> 90W, 135W or 170W?

2020-09-07, 18:28 PM

I bought a 170W version and it doesn't work.

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7 Posts

08-19-2020

Poland

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Re:Lenovo Legion smaller charger -> 90W, 135W or 170W?

2020-09-13, 21:12 PM

Finally, I bought a female-to-male square adapter, replaced the signal resistor with a 4,6k Ohm one regarding to this page:

http://www.thinkwiki.org/wiki/Power_Connector#Signal_Pin_2

And now it works even with a 90W charger.

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1 Posts

10-03-2020

United States of America

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  • Message 4 of 7

Re:Lenovo Legion smaller charger -> 90W, 135W or 170W?

2020-10-03, 18:55 PM

"Finally, I bought a female-to-male square adapter, replaced the signal resistor with a 4,6k Ohm..."

 

Hi "z0nk0",

 

I'm looking for a similar solution to yours and it seems the "4.6k trick" should also work for my case.  Could you please provide more details?:

 

  • Female-Male Adapter:  Part #?  Where you bought it?
  • What you actually did to the adapter?  Crack it open, unsolder and solder, etc.

 

Thanks in advance!

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7 Posts

08-19-2020

Poland

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  • Location: Poland
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  • Message 5 of 7

Re:Lenovo Legion smaller charger -> 90W, 135W or 170W?

2020-10-12, 14:02 PM

Hi Legio715, I bought it in locally e-commerce shop in Poland, you can find this adapter under the name "Akyga AK-AD-49".

I tried to find it for you on aliexpress and it was suprisingly hard to do it :)

Here please the link:

https://www.aliexpress.com/item/4001065771349.html

 

Or try to search for "lenovo square female to square male adapter" or "lenovo slim tip female male adapter".

 

I based my modification on this site:

http://marc.merlins.org/perso/linux/post_2016-02-29_Hacking-a-thinkpad-slim-tip-adapter-to-output-more-than-90W-_required-to-charge-a-Thinkpad-P70_.html

In short:

you have to cut the male plug into 2 parts and there is a small resistor soldered directly to ground and signal pin. I replaced it with proper resistor, hot glued to secure it and 3d-printed the new enclosure for the plug.

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71 Posts

08-31-2020

United States of America

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Re:Lenovo Legion smaller charger -> 90W, 135W or 170W?

2020-10-24, 0:40 AM

Thanks for the info. I also want to use a smaller 45W charger to slowly charge my Legion 5 (on a plane) when it is off. Since the 4.6k resistor mod essentially tricks the laptop into thinking a 230W charger is attached, is there any risk of damaging the charger or laptop? Id hate for the laptop to draw too much power when accidentally powered on and fry something.

 

Thoughts?

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2 Posts

11-08-2020

Turkey

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  • Message 7 of 7

Re:Lenovo Legion smaller charger -> 90W, 135W or 170W?

2020-11-08, 10:16 AM

If the charger is designed well the laptop would try consuming higher currents and the charger would close itself, then after certain time the carger would come back. This annoying cycle would repeat itself..

 

It's pity Lenovo did not bother designing a laptop that can work with different size of chargers. Even not using USB-C power delivery is ridiculous.. 

Most of us has to buy gaming laptop because of the specs. We buy for business not for gaming.. And we carry the device around..

That's why I prefer Apple laptops.. Even a powerbank can charge my 16"..  I wish they worked nice with Windows..

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