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20 Posts

01-31-2014

Devon, UK

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Re: t540p power supply problems

2014-03-24, 10:55 AM

Message to Mark_Lenovo / administrator or NINE / lenovo staff

 

stm wrote that when he contacted tech support he was told that

 

".... and a post in any lenovo forum from anybody even calling himself administrator does not mean anything...."

 

Can you advise? The problem on my machine is now getting worse so the next step is to change the power chord as you recommend in your post however  I do not want to have another frustrating discussion with tech support!

 

alternatively when the IBM engineer visited he said I should raise a complaint as this is handled by customer service.  Has anyone had any luck with this?

 

Many thanks

 

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10 Posts

03-07-2014

Germany

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Re: t540p power supply problems

2014-03-24, 22:02 PM

Hi Patrick,

 

 i can confirm that after using FRU 45N0362 I did not have any screen darkening or "airplane mode".

 

The both power adaptors seem to be different in their internal electrival structure, as the have different input values on the  label

 

                                         FRU 45N0362      FRU 45N0362

                                         2014.01               2013.12

                                         Rev A                   Rev 100

Consumo de energia         148,3Wh              150,54Wh

En Modo de espera           0,17Wh                0,0954Wh

 

If i do a connect/disconnect sequence of the FRU 45N0362 power adaptor I still get "airplane mode" - I am not sure if this is from "the problem" or I just confused a driver ;-)

 

I got the DC in assembly spare FRU 04X5515 50.4LO05.011 - up to now no date with a technician.

 

Patrick, I can imagine ho disappointed and helpless you feel, having spent money on a product perceived as premium, just to find out that the product may not hold and the hotline has questionable service attitude.


Have you tried to approach a service provider directly? http://support.lenovo.com/de_DE/product-service/service-provider/findServiceProvider.page

 

Good luck Patrick,

at least the community is still strong

 

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20 Posts

01-31-2014

Devon, UK

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Re: t540p power supply problems

2014-03-25, 8:21 AM

Hi stm

 

Thank you for the details and moral support.

 

Note: I think the right hand column header should be FRU 45N0366 ?

 

Mark_Lenovo: Another example where the Delta adapter fixed this problem.

 

Would it not be a cheap and practical step to offer anyone who has experienced this problem a Delta adapter to test out this theory?  I am still reluctant to have my machine dissambled again (assuming I can get tech support to agree to replacing the chord).

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6 Posts

03-19-2014

Vietnam

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Re: t540p power supply problems

2014-03-25, 8:31 AM

Since i Got one error And Windows fail to start again. I have REINSTALL NEW FRESH WINDOWS 7 PRO 64 BIT  and it fixed the probelm about unplug power. No more happened.

 

But I dont understand about this machine anymore.

 

Too many time with BOSD happened or freeze of system,cant do anything and must be hard shutdown by keep holding power start button.

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24 Posts

11-03-2010

United Kingdom of Great Britain and Northern Ireland

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Re: t540p power supply problems

2014-03-25, 11:14 AM


wrote:

<snip> 

Too many time with BOSD happened or freeze of system,cant do anything and must be hard shutdown by keep holding power start button.


Have you tried updating drivers? During  the first week I had my T540p (Dec 2012), after about one in every three times I used Standby or Hibernate, the machine would not wake up and I had to do a hard shutdown.

 

Then I noticed that new drivers were available (go to 'Lenovo ThinkVantage Tools / Update and Drivers').  I installed the new drivers and the problem went away. (I described all this here).

 

Since doing the driver updates, and having the internal power connector replaced under warranty (Jan 2014), the machine has been totally reliable. 

T540p / 64-bit Win7 / 840 Pro SSD / Ultradock.
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6 Posts

03-19-2014

Vietnam

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Re: t540p power supply problems

2014-03-25, 16:54 PM

My problem gone since i Installed new Windows,not much **bleep** again. 

I'm ok with it now and still looking around it.

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3 Posts

03-19-2014

Italy

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Re: t540p power supply problems

2014-04-02, 20:22 PM

Same problem in my T540p.

 

Screen blinking, battery at 98%, power problem popup....

 

(facepalm)

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3 Posts

03-19-2014

Italy

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Re: t540p power supply problems

2014-04-03, 15:17 PM

I noticed that the problem occurs only when the battery is almost fully charged and the system switches to the AC.

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8 Posts

01-06-2014

Finland

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Re: t540p power supply problems

2014-04-08, 5:52 AM

I wonder if this case has gone forward? My T440p is still having same state... Only difference took place with the newest "Lenovo Settings Dependency Package".

 

After installing that driver (2.0.0.16):

- power cut occurs less often

- but sometimes when it happends, power scheme jump automatically to airplane mode and it stops charging the battery

 

And there is also something wierd in sleepmode. After wake-up, I can change power scheme but it does not have any effect in cpu frequency. It remains same until reboot.

 

I am not really happy with this setup :(

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6 Posts

04-08-2014

Russia, St. Petersburg

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Re: t540p power supply problems

2014-04-08, 16:27 PM

Hi all,

 

Mine two coins:

 

At company we are using Lenovo as world-wide standard and partner. So as pilot I've got to test an X240, T440 (with i5 CPU), T440P (with quad-core/QM i7 CPU) and T540p (with quad-core/QM i7 CPU). Unfortunately W540 are not yet available in Russia as of now to test them (and proposed in US 170W PSU for them).

 

So what we got:

X240 with 90W PSU

T440 with 90W PSU

T440p with 135W PSU

T540p with 135W PSU 

Two docking stations 90W

Two docking stations 135W

 

Skipping to main story:

 

Everything was fine till I've started to test T540p. It showed mentioned issue here - power shortages and accidental "airplane mode".

 

Then I've started to test docking stations (with their respecting PSU attached). Issue showed on T440, T440p and T540p (but not on X240) and only on dock.staions with 135W adapters attached.

 

As side note - when laptop is plugged into docking station, sometimes all USB devices plugged into it disappears. Docking stations are all flushed with the latest firmware available.

 

And for the desserts: this issue show ONLY when battery is fully charged. If it is charging, then LiteOn PSUs are working perfectly fine.

 

Now a bit technical part:

 

Both T440 and T440p had been shipped with PSU FRU# 45N0362 (Delta)

T540p and both docking stations with PSU FRU# 45N0366 (LiteOn)

 

Now the questions for Lenovo technicians, support and just overall enthusiasts:

 

1) Is it really an issue with tolerance of DC cable inside laptop, as for both affected T440p and T540p they are different?

 

2) Is it really an issue with tolerance of DC cable that connects only plug, located IN laptop base to motherboard, as this issue reproduces on any docking station (when PSU connected directly to docking station and power goes to laptop via replication port)? Docking stations are flushed with latest firmware.

 

3) Is it really an issue with tolerance of DC cable when Delta PSU resolves this issue completely? And also changing PSU to 90W and plugging it either into Docking station or directly into laptop resolves everything.

 

4) [Sarcasm] I can't cut into power cable and PSU-to-laptop cable right now, as it under warranty right now. But why do I have a premonition that power readings (voltage and amperage) will be very interesting during the times when battery controller says to system that it had enough and is full? [/sarcasm]

 

Oh, yeah. Totally forgot. We got same attitude from Lenovo support regarding forum posts - only inside documents are good for them.

 

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