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Y40 black screen when unplugged from power (tried all power management suggestions)

2017-09-13, 7:01 AM

I bought the Lenovo Y40 a few years ago and RARELY used it.  But when I did it worked fine until I upgraded to Windows 10.  Since then the screen flickered when on battery power only.  I just recently installed latest Windows 10 updates (9/12/2017) hoping it would resolve.  Now the screen goes black entirely when unplugged.  I have tried seemingly ALL the suggested posts on Power Management and even replugged in the display.  So many people seem to have had this resolved via Power Management - I can't seem to.  Help!

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02-22-2017

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Re: Y40 black screen when unplugged from power (tried all power management suggestions)

2017-09-15, 8:44 AM

Hello Hedgerocket

Thanks for using the Lenovo forums.


Have a read of the following posting, see if this is able to help you out at all:

 

https://forums.lenovo.com/t5/Lenovo-P-Y-and-Z-series/Y40-70-turns-off-when-unplugged/m-p/2068450

 

Hope this helps, let us know how you get on.


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Re: Y40 black screen when unplugged from power (tried all power management suggestions)

2017-09-15, 14:31 PM

That thread doesn't seem to be relating to the issue I am having.  When I unplug my AC power the display's backlight goes off (the same as if you hit Fn+F2).  You can still faintly see the screen and the computer works - you just can't see what you are doing.  If I take a screen shot of the battery meter when in this state I can tell when I plug the AC back in that the battery meter shows 97%.

 

This is similar to the threads stating the display "flickers" when the AC is unplugged after upgrading to Windows 10.  With the latest update to Windows 10 recently I thought I would try it to see how it affects my display (hoping there was a fix to resolve it).  Now it just seems to shut off the backlight as mentioned.  From what I can tell there is no "flickering" in that state, but still unusable without the AC plugged in.

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08-25-2018

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Re: Y40 black screen when unplugged from power (tried all power management suggestions)

2018-08-25, 22:12 PM

did you solve the problem? I hace exactly the same problem

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Re: Y40 black screen when unplugged from power (tried all power management suggestions)

2018-08-25, 23:41 PM

Yes, I did!  I ended up buying a new screen that I installed myself (super easy).  The screen was about $60.  It was my last ditch effort since none of the software settings were helping.  Somebody (somewhere on the internet) mentioned a new screen and it worked.  

0 person found this solution to be helpful.

This helped me too

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Re: Y40 black screen when unplugged from power (tried all power management suggestions)

2018-08-29, 23:14 PM

Thank you so much! I just put the new screen replacement and it works perfectly, I tried two batteries and all the power management stuff, also tried with windows 8 and 10. I was getting crazy searching in the web. I really needed it for my classes without depending from the charger.

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Re: Y40 black screen when unplugged from power (tried all power management suggestions)

2018-08-30, 14:31 PM

Glad I could help.  I know how it feels.  I searched on and off for months.  It was a computer I rarley used, let the warranty expire, but it was still pretty expensive.  I almost scrapped it.  If a laptop can't be a laptop, what's the point?  Surprised the solution was so hard to find.  Lenovo should have known this since it seemed to be linked to the Windows 10 update from a long time ago.

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