T410 - LED backlight turns off as soon its plugged in and battery threshold warning pops up

[tongyang]

@TinyRK

First

second: Plugg in AC adapter, The backlight don't be closed.

Try it !!!

[fly4l]

Hi TinyRK, thank you for reporting this problem, I also have this since I bought my T410.

And, I also did not get this issue repaired by the onsite service, actually. My motherboard was also already changed

I also cofirm that this is not an OS problem and, for my T410, a thing of battery charge level, it also occurs when changing to power supply in BIOS mode, also with a high level of battery charge.

[TinyRK]

My T410 is now at Lenovo directly with actual engineers, not just technicians. 

We'll see what happens next.

But I am seriously annoyed! 

[fly4l]

Okay, good luck. Keep us informed.

[mihaigabriel]

Hello,
Recently I had the same issue with a Lenovo T520 machine.
In my case,the problem was that Windows 7 automatically changed the refresh rate from 60HZ (on power) to 50HZ(on battery).
I solved the problem by editing the Windows7 power management for the Intel Graphics and changing the value from Balanced to Maximum Performance.

[TinyRK]

That only makes the screen look weird (washed out colors), but does not turn off the LED-Backlight.

And I have a dedicated nvidia-GPU, not the Intel GMA, so this is not related, i guess.

[mihaigabriel]

I am sure that my T520 had the same yimptoms as in the movie on youtube.

I have an NVIDIA 240M with Optimus technology ,but when I tested the NVIDIA card wasn't used , only the Intel.

The test was simple:

- right click on Desktop,Properties->Monitor->Refresh Rate = 60HZ - on power

- unplug the power cord,the screen turn off,then on . Refresh Rate = 50HZ - on battery (the colors were the same)

- edit the power management settings,then retested - everything OK

The only difference in my case is that the screen turns on automatically .

Regards,

[fly4l]

On my T410, the error seems to be fixed.

The technician did an onsite service and swapped my display panel and display cable. Now the backlight is still on after plugging in.

[TinyRK]

After the awesome lenovo Squad Team (yes, there is such a thing )checked my T410, I will get it replaced.

I would have not accepted any other solution, since it took only 5 service-calls on this issue.

Anyways, thank you Lenovo and this is why I bought the 3-year accidental Thinpad yadayada insurance protection masterplan!

I will be happy once I have my new Thinkpad in my hand.

[pkrajnovic]

Hi all,

I m having similar problem with T410s - no backlight no matter what I do. Changed display twice, motherboard once and LED cable once. 

Is there a solution?