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13 Posts

01-11-2014

AL, usa

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  • Message 41 of 128

Re: t540p power supply problems

2014-01-20, 4:02 AM

from my experience it's all an issue with the adapter...

 

after i switched to using 90w with the ultradock I haven't had any issues... 

 

I was a little worried about the supply not providing enough power,so i spread the ac side of the cord so i could use my clip on amp meter.. the highest load i saw was .75 amps (my power is a nice consistent 120v) so thats 90w from the wall... so best case it was supplying 81w to the notebook and dock....  It's right on the edge.. but the notebook was charging at the time as well...

 

 

Lenovo t440p i7-4800mq, 16gb crucial ballistix, sandisk extreme ii ssds (240 and 480gb latter in ultrabay) FHD IPS
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11 Posts

12-18-2013

Germany

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  • Message 42 of 128

Re: t540p power supply problems

2014-01-21, 14:59 PM

Hi there,

 

we have exchanged the power supplies, which did not solve the issue.

Now we are waiting for a Lenovo technician to solve the issue here.

 

I will reply, if we find a solution and which it is.

 

Best regards

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2651 Posts

03-21-2012

Malaysia

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  • Message 43 of 128

Re: t540p power supply problems

2014-01-27, 8:54 AM

Hi all,

 

thanks for posting great to see some resolution. I understand that it has not work for some but it has work for other too. With this being said, I like to break this down a bit more and looking through the proces of elimination. Now, To those connected with a docking station, may I know what is the MTM or Serial of the Dock you're using? Could you PM(Private message) me the info.

 

Now looking at the case I believe that there could be a specifi batch of machines that may be affected by this issue but we still need to detemine and confirm this.

 

Really hope to hear back.

 

Regards

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8 Posts

01-06-2014

Finland

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  • Message 44 of 128

Re: t540p power supply problems

2014-01-28, 7:06 AM

My T440p went for service a moment ago, it will have a new motherboard installed and should be back later today.

 

I'll report in few days if the problem is fixed.

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8 Posts

01-06-2014

Finland

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  • Message 45 of 128

Re: t540p power supply problems

2014-01-28, 13:50 PM

Well, got machine back from service... and the new motherboard didn't change situation. It behaves same as before.

 

Let see what Lenovo service center wants to try next...

 

 edit: I have lost my preinstalled Windows 8 serial from bios due to new motherboard :(

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3 Posts

01-28-2014

Germany

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  • Message 46 of 128

Re: t540p power supply problems

2014-01-28, 16:40 PM

From what I learned from various online communities, this power supply problem would be sovled by replacing the original 135w adapter with a 90w adapter.

 

I am however not sure a 90w adapter would be sufficient for a quad-core+730M graphics machine.

 

If you donot have a 90w adapter at your hand, you can slightly alleviate (but not eliminate) such annoyance by setting the brightness at the same level for AC mode and Battery mode.

 

Anyway, eagerly wish Lenovo could soon provide an official solution for this problem.

 

Best regards!

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11 Posts

12-18-2013

Germany

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  • Message 47 of 128

Re: t540p power supply problems

2014-01-30, 9:37 AM

Hi there,

 

 

after two weeks we did not see a Lenovo technician, instead we have got now 5 new power supplies that are not solving the issues.

The German support is not able to help us, which is not only very disapointing, it is a desaster for us.

 

We will now return the unusable notebooks (now we have got 4 not working T540p!!!) and buy new notebooks from a another company.

 

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3 Posts

01-10-2014

Netherlands

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  • Message 48 of 128

Re: t540p power supply problems

2014-01-31, 10:00 AM

Can you share which power supplies you tried? Were these also the 135 watt power supplies or did you try the 90 watt ones?

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20 Posts

01-31-2014

Devon, UK

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  • Location: Devon, UK
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  • Message 49 of 128

Re: t540p power supply problems

2014-01-31, 13:34 PM

I have a T540p running Windows 8.1 and 135W supply.  Every few hours I get a  "Power Manager has detected problems with your AC power supply and enabled the aircraft power mode" and the screen dims etc.  I also noticed that the battery had dropped from 100% to 92% and charging, despite the power adapter being in.

 

I called tech support and they said to try with running with no other devices attached.  Not a very helpful response given this thread suggests there is a fault somewhere.

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162 Posts

10-21-2009

Netherlands, Hilversum

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  • Location: Netherlands, Hilversum
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  • Message 50 of 128

Re: t540p power supply problems

2014-02-01, 14:18 PM

Well, my screen didn´t go black and turn back on again after 3 seconds at all for a long time. Until i switched office at work and connected ANOTHER (different type) external VGA terminal. Now when i disconnect and reconnect the power my screen went black for 3 seconds every time.

 

I have discovered that my (internal display) refresh rate was somehow switched to 60 Hz in the settings (when on power). And there is also an energy setting in the video driver that tells it to switch to 59Hz when on battery.

 

So now my internal screen switches to 60 Hz when connecting the power plug and switches back to 59 Hz when unplugging the power. This results in 3 seconds black screen.

 

I resolved this issue for me to enable 59Hz everywhere (b.t.w. there is no 60Hz settings in my display enengy window, thus i use 59 Hz everywhere).

 

See the following images:


resolution.jpg

 

resolution2.jpg

 

 

So be carefull with the selected refresh rates. Maybe it is also the same with docking and an external monitor attached.

 

I also noticed that somehow when changing power/battery and the display needs to refresh (because of different refresh rates), i also got the power failure message sometimes. I never have that when the refresh frequencies stay the same and the screen is stable. So somehow the display switching triggers that at well (small bug?).

 

Hope this helps some people!

 

Regards, Jan

--- Lenovo Thinkpad t440p (20AN-CT01WW) + SAMSUNG MZ7TD512HAGM-000L1 SSD + 16G SDRAM + 14.0FHD 1920x1080 ---
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