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27 Posts

09-19-2012

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Re: W530 Power Adapters, 90W vs 135W Vs 170W

2017-01-25, 7:07 AM

[ Okay, that's weird and really annoying; I posted this update to this yesterday, and it disappeared :(  ]

 

I soldered in a 1kohm resistor, and after one false start (the first time I restarted with the adjusted adapter plugged in, although the Lenovo Settings Battery applet did show a good 135W AC adapter connected, it didn't charge the battery from 97%, but afterwards it seems to be working perfectly).

 

For any who are interested, I got the fairly high quality (a bit hard to hack because of the wax injected around the wiring and the original 550ohm resistor, but that makes it nice and stable) barrel-to-"slim" adapters from Aliexpress (the specific vendor from which I got them now says out-of-stock, but there's dozens of what I assume are the same OEM part).

 

I've sent emails to a bunch of vendors of that part, asking them to procure parts with 1kohm resistors to match 135W power supplies. I'll see if any answer.

 

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27 Posts

09-19-2012

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Re: W530 Power Adapters, 90W vs 135W Vs 170W

2017-01-29, 16:36 PM

Hmpf. So, it's hit-or-miss whether the "135W" adapter will charge my Thinkpad P50's battery. Mostly hit. But I've now seen two misses, where although the Lenovo Settings Battery gauge shows a "good" "135W" adapter, in fact it just doesn't charge the battery. 

 

No useful responses yet from the various power supply vendors about their 135W rated supplies (size, weight) nor from the vendors of the barrel-to-"slim" adapters about getting them manufactured with different resistance already built-in.

 

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27 Posts

09-19-2012

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Re: W530 Power Adapters, 90W vs 135W Vs 170W

2017-03-27, 6:27 AM

I've been using the notebook and the hacker power supply tip more lately, and I've found three things:

  1. 1. (This is not news, but it's good to remember) The ThinkPad P50 won't charge when it is in "airplane" mode. If you want the wireless functions off but the computer to charge, you have to leave it out of airplane mode, and manually turn off WiFi and Bluetooth. (In airplane mode it will run from the adaptor, but will not try to charge the battery while on.) So, not relevant to the adapter tip resistor question.
  2. 2. The computer definitely doesn't charge the battery until battery capacity has fallen below about 90%. Not sure whether that's universal (though I have that battery-life-extender feature turned off) or whether it has something to do with the lower wattage adapter. My guess is that it's a bug and the "don't constantly charge the battery" saver feature is on even though I've configured it as off. So, not relevant to the adapter tip resistor question.
  3. 3. Here's the rub. Sometimes, with the hacked adapter tip in use, on a 90W power supply, the notebook thinks that it has no power supply connected at all, and it fully runs from battery. Disconnecting and reconnecting the power adapter doesn't make it recognize the power supply. Disconnecting, putting it in to sleep mode, waking it up, and reconnecting, sometimes helps. Other times I have to recharge it in sleep or hibernate/off modes.

 

So, I cannot call my experiment a success :(

I'd appreciate further insights, to help identify whether this is the best we can expect from a 90W adapter (that is, from time to time, the notebook will actually draw more than the adapter can supply, and despite the resistor the notebook will notice this and give up trying to charge for an extended period of time - even though I was never under any circumstances able to push the notebook to draw over 70W even in stress tests, and in the use cases where I found the results above I never pushed the notebook nearly as hard)?

.. or whether this suggests that either the 90W adapter I'm using (KFD-90WNB, nicely very thin and small and light) maybe really can't handle the P50, or even that my soldering job wasn't good enough (though I doubt it, as the shell of the slim tip is very rigid, and measuring the resistance comes up with a stable value (996ohms).

[Or, third possibility, the KDF universal power supply has interchangeable tips, and the 5-pin connector between the universal power supply's output and the Lenovo barrel tip, into which I plug my hacked barrel-to-slim tip adapter, maybe doesn't stay reliably enough connected]

 

Relatedly, I'd appreciate suggestions on small, light 90W adapters with Lenovo barrel tip outputs which you have found to be good enough quality to use with a hacked barrel-to-slim tip adapter cable. All of the ones that I'm finding on AliExpress, although decidedly smaller and lighter than the original Lenovo 170W brick, are still much larger than the nice slim KFD 90W universal adapter.

thanks,

-Jay

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27 Posts

09-19-2012

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Re: W530 Power Adapters, 90W vs 135W Vs 170W

2017-04-23, 11:25 AM

Updates, here are the results of two power supplies that I purchased for use with my hacked barrel-to-"slim tip" connector, in seeking the smallest, lightest, still reliable travel replacement for Lenovo's original 170W 500 gram brick of a power supply.

 

I ordered two possibilities from AliExpress:

Note that these two are both 90W power supplies. I found NO significantly-smaller-and-lighter 135W nor 170W models.

So the barrel-to-"slim tip" connector resistor hack IS necessary, but at least this way we can do it reliably.

 

Aside from the above, my experience continuing to use my older 90W universal power supply, with its not-very-secure exchangeable tip attachment, was frustrating. Regularly, the notebook would cease charging. I was never able to be sure whether it was because the notebook really wanted more juice than the adapter could supply (I doubt it, as I have never been able to push my notebook to draw more than 70W from the wall under any stress testing conditions, and my normal use never gets near that heavy), or whether it was just the unreliable exchangeable tip connection (my assumption).

 

I'll report back again after I've used the new LVSUN universal adapter for a while, to tell you all whether it is reliable, or if even this suffers from the occasional/regular problem.

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1 Posts

06-17-2017

Belgium

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Re: W530 Power Adapters, 90W vs 135W Vs 170W

2017-06-17, 8:58 AM

Hey,

 

I am very interested in your results of the LVSUN adapter. Did it do what it needed to do? I'm thinking of buying one for my Y520 myself for portability purposes...

 

Thanks!

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27 Posts

09-19-2012

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Re: W530 Power Adapters, 90W vs 135W Vs 170W

2017-06-17, 9:20 AM

I've now been using the LVSUN 90W supply extensively. It works perfectly with my originally reported first attempt at hacking the right resistor into the slim tip.

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7 Posts

08-19-2017

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Re: W530 Power Adapters, 90W vs 135W Vs 170W

2017-08-22, 20:34 PM

Can we use the new 170W Slim Tip Power Adapter on our W520/W530 (Barrel tip) by using this Lenovo Thinkpad Barrel Conversion Cable available at Lenovo Shop?

The Barrel tip goes into the Thinkpad W530/520 while the new 170W Power Adapter Slim Tip goes into the Conversion Cable.

 

Will the Thinkpad W520/W530 Power Manager recognize this combo as a 170W Adapter?

 

Thanks.

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11807 Posts

01-02-2010

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Re: W530 Power Adapters, 90W vs 135W Vs 170W

2017-08-23, 2:56 AM

No.  I have never seen a conversion cable that passes the signal pin through, and even if it did, the round 170W adapter is identified by 1500 ohms between the signal pin and ground.  The 170W slim-tip adapter has 19,000 ohms


Rich


I do not respond to requests for private, one-on-one help. Your questions should be posted in the appropriate forum where they may help others as well.

If a response answers your question, please mark it as the accepted solution.

I am not an employee or agent of Lenovo.
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27 Posts

09-19-2012

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Re: W530 Power Adapters, 90W vs 135W Vs 170W

2017-08-23, 5:03 AM

wrote:

No.  I have never seen a conversion cable that passes the signal pin through, and even if it did, the round 170W adapter is identified by 1500 ohms between the signal pin and ground.  The 170W slim-tip adapter has 19,000 ohms


Hi richk,

Please pass this feedback along to Lenovo engineering and product management:

Since Lenovo sees fit to go to the trouble of engineering the ability for the Thinkpad, etc power subsystems to be able to read the resistance on the signal pin to identify the type of adapter connected, and also has engineered 'airplane' mode where the notebook can put itself into a lower power draw mode, please finish this half-baked job by making the power subsystem willing to work to whatever level the supply actually supplies without forcing don't-charge or airplane-mode when the actual power needs are well within an attached adaptor's smaller-than-170W rating.

It sucks that we have to either carry around 1+ pound bricks, or hack adaptors, to be able to use our never-more-than-70W normal configuration Thinkpads with smaller-than-can-run-an-aircraft-carrier power supplies!

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7 Posts

08-19-2017

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Re: W530 Power Adapters, 90W vs 135W Vs 170W

2017-08-23, 11:28 AM

Hi Richk,

 

Are we correct to say that both Lenovo (1)  Thinkpad Slim Tip Power Conversion Cable and  (2) Thinkpad Barrel Power Conversion Cable are practically useless for the 170W Power Adapter?  

 

(1)  To convert older (Pre-2013) Barrel Tip 170W Power Adapter to power up W540 or later models like, P-50, P-51, etc.

(2)  To convert NEW (Post-2014) Slim Tip 170W Power Adapter to power up  W530/W520 or earlier models.

 

If they could modify the Conversion Cables to include a Variable Resistor or tiny chip to make Thinkpad Power Manager recognize the Host Adapter, then this problem could be solved?   Lenovo does not explain clearly the purpose of these 2 Power Conversion Cables on their web store.

 

Thank you for your advice.

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