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2651 Posts

03-21-2012

Malaysia

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  • Message 31 of 128

Re: t540p power supply problems

2013-12-18, 9:33 AM
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2651 Posts

03-21-2012

Malaysia

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  • Message 32 of 128

Re: t540p power supply problems

2014-01-09, 4:13 AM

Hi all,

thanks for posting .

 

Just wanted to keep you informed that I've escalated this cae to our teams and the case is still under investigation. I'll post more once I get further updates on the developements of the investigations.

 

Regards

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3 Posts

01-10-2014

Netherlands

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Re: t540p power supply problems

2014-01-10, 16:59 PM

I am having the same problems. I am using a 135 watt power supply. Phenomenon is really intermittent and it does not seem to have anything to do with anything physical/hardware. I cannot reproduce it by doing anything physically. I randomly get the message that a problem was detected with the power supply and that the machine will go into airplane modus. When I choose "no" it goes back into the normal scheme and my power supply goes straight into "plugged in" again (whereas during the issue it is definitely gone). The power icon stays at "99% available (plugged in, not charging)". Please advise. Regards, Rene

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11 Posts

01-29-2013

Poland

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  • Message 34 of 128

Re: t540p power supply problems

2014-01-11, 10:24 AM

The same issue with T440P - quadcore i7-4700MQ  with 135W power adapter. 

 

Occasionally laptop monitors darken for 2-3 secs, and power button blinks on that time (the same like power-supply would be plugged-in)

 

I wanted to buy Ultradock station with 90W power supply to be used on travel (lighter and smaller) - and use my laptop 135W adapter with the dock. But it seems this issue will heavily escalate with docking configuration: 

 

http://forums.lenovo.com/t5/T400-T500-and-newer-T-series/T540p-T440p-UltraDock-external-display-issues/td-p/1368847

 

It's little annonying right now - but if all my monitors would turn-off for that 2-3 seconds it would be terrible...

 

Any updates?

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3 Posts

01-10-2014

Netherlands

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  • Message 35 of 128

Re: t540p power supply problems

2014-01-11, 11:22 AM

I took the liberty of measuring my power adapter. It's a ADL135NLC3A revision 100. The output voltage is approximately 20 volts (according to specifications), the output current is 9 Amp DC though. The specifications state it should be 6.75 A DC. So the output power calculates to 180 Watt not 135. So this adapter goes well beyond its own specifications. Any thoughts on that? Could this be a problem?

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13 Posts

01-11-2014

AL, usa

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  • Message 36 of 128

Re: t540p power supply problems

2014-01-11, 16:46 PM

I've noticed the same issue with my dock when I'm using the 135 watt adapter... at first I thought something was overheating and causing the reconnect... so yesterday after it happened, I looked through the event logs and everything just looks like an undock-redock event..

 

So I looked at the adapter and pushed in the plug end from the wall and was able to push it in a little more.. I'm hoping the wall cord was just loose... if it happens again I'll switch to the 90w and if that fixes it I guess I'll start the support process...

 

Ok happened again this morning, so swapped in the 90w adapter... 

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

12-18-2013

Switzerland

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  • Message 37 of 128

Re: t540p power supply problems

2014-01-14, 8:44 AM

Hi all,

 

The solution is to ask the Lenovo Support to exchange the defective part.

It is the power connector inside the laptop.

 

The FRU is 04X55215.

 

We had the power problem with the air plane mode that activates after a batterie error message, but with the exchange of this piece, all is fine.

 

Best regards,

Pim20140113111509_ylo_photo%203.jpg20140113111532_ylo_photo%201.jpg20140107103001_ylo_erreur2.png20140107102949_ylo_erreur1.png

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8 Posts

01-06-2014

Finland

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  • Message 38 of 128

Re: t540p power supply problems

2014-01-15, 10:07 AM
I called Lenovo service and ordered a new power cord due to above failures. It arrived and didn't help, same symptom continues.

Both cords are 135W, FRU 45N0366, Rev.100, manufactured 2013.

Getting enough of blinking, I opened the bottom lid and had a look of power connector. I removed the plug from motherboard and and bent the cable back and forth. As I don't have multimeter to measure resistance from the cables, I can't say where problem lies.

However, after that operation no more blinking or such. Probably the connector to motherboard has weak connection to some of the pins?
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8 Posts

01-06-2014

Finland

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  • Message 39 of 128

Re: t540p power supply problems

2014-01-15, 21:32 PM
Hi.

The issue came back.... I tested the power connector to motherboard by running the computer without bottom lid and moving the connector and the cable - no effect what so ever.

But finally, been running past 4 hours without error! The solution was to disable CPU power manager from bios.

This can't be the final solution, as the fan is running nonstop on performance mode, on balanced mode it runs as supposed.

And btw, the computer is t440p.
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11 Posts

01-29-2013

Poland

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  • Message 40 of 128

Re: t540p power supply problems

2014-01-19, 18:59 PM

Hi!

 

In the end I bought Ultradock docking station - it comes with 90W adapter. First I tried my 135W adapter - and just like I thought this problem escalated like described here: http://forums.lenovo.com/t5/T400-T500-and-newer-T-series/T540p-T440p-UltraDock-external-display-issues/td-p/1368847

 

Now - from time to time - both of my monitors turn-off for 2-3 seconds. It's just like dock would loose power for a short-time. When I unplug and plug power cable - the result is the same (monitors turn-off for 2-3 secs). 

 

Now - I'm testing 90W power adapter that comes with my dock... And it's seems there is no issue (at least for last 2 days). So I guess the problem resides in the 135W adapter. 

 

Any updates? Not sure right now - if this problem is because of power-adapter or power-connector?

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