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JoeSole
Paper Tape
Posts: 3
Registered: ‎03-14-2018
Location: US
Views: 1,252
Message 1 of 7

Ideapad 720s won't turn on without ac adapter/battery fully charged

Hi all,

I have a couple of months old ideapad 720s running win10. Since a few days ago, I am not able to turn on my pc without the ac adapter plugged in. However, the second I turn on the computer, I can take the plug off an my pc works fine just on the battery. The battery is also charging ok, it just won't start the laptop.

 

I don't recall doing any system/driver/software updates around the time this issue first occurred. Also, my energy managment seems to loose "memory" of my settings whenever I turn off the pc and unplug the ac adapter. If the cord stays in all the time while the pc is turned off, the energy managment settings work just fine.

 

So, it seems like a hardware issue to me, but it's hard to imagine what exactly could be the problem, since the battery is charging. Any help would be much appreciated!

 

 

Support Specialist
Posts: 2,948
Registered: ‎02-22-2017
Location: GB
Views: 1,182
Message 2 of 7

Re: Ideapad 720s won't turn on without ac adapter/battery fully charged

Hello JoeSole

Thanks for using the Lenovo forums.


Very weird issue, not come across this myself before, sounds more like a hardware fault than software as you mention.

 

Try a static discharge for this, it may help to resolve the issue or at least get rid of any built up static on the motherboard.

(If the battery is internal, please just skip the remove/replace battery steps.)
1. Turn the unit off
2. Remove the battery and the Mains adapter
3. Press and hold the front power button for 30 seconds
4. Replace the battery and the Mains adapter
5. Turn the unit on as normal

 

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


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JoeSole
Paper Tape
Posts: 3
Registered: ‎03-14-2018
Location: US
Views: 1,180
Message 3 of 7

Re: Ideapad 720s won't turn on without ac adapter/battery fully charged

Krakken, thanks for your idea.

 

Indeed, I have tried all the possible forms of static discharge (15 sec, 30 sec, 1 minute) but nothing seems to work. Some people described that they see an orange light indicating charging while pressing the power button; however, I don't see any light irrespective of how long I press the power button. It basically looks like the pc has absolutely no power.

 

For a while, I suspected that maybe BIOS battery may be old, but BIOS settings seem to be intact (i.e. they do not reset to default) when I unplug the PC. Well, the mystery continous...

Support Specialist
Posts: 2,948
Registered: ‎02-22-2017
Location: GB
Views: 1,176
Message 4 of 7

Re: Ideapad 720s won't turn on without ac adapter/battery fully charged

 

How odd...

Try running an LSC scan, see if this is able to find anything for you:

 

1. Please click on the following link

2. Under the section ‘Download’ select the relevant Hyperlink dependant on whether your Lenovo is running Windows 7/8/8.1 32 bit or 64 bit.(Will work on Win10)
3. When prompted, select save and browse to a drive and directory in which to save the downloaded files.
4. Navigate to the folder where you saved the installation file, lscsetup_x86_26001.exe.
5. Double-click the installation file icon to start the installation.
6. Follow the onscreen instructions via the installation wizard that will install Lenovo Solution Centre on your system.
7. Once installed you will have a ‘Lenovo Solution Centre’ icon on your desktop please click to open this.
8. Once solution center is opened please select ‘Checkup’ then ‘Hardware Scan’ and ‘Full Scan’
9. This will take up to 20 minutes, see if this can find any errors.

 



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JoeSole
Paper Tape
Posts: 3
Registered: ‎03-14-2018
Location: US
Views: 1,160
Message 5 of 7

Re: Ideapad 720s won't turn on without ac adapter/battery fully charged

Tahnks for the idea. Alas, nothing found. Everything in green...

Support Specialist
Posts: 2,948
Registered: ‎02-22-2017
Location: GB
Views: 1,145
Message 6 of 7

Re: Ideapad 720s won't turn on without ac adapter/battery fully charged

Figured as much, in that case I`m not quite sure what else.

 

I`d recommend you follow up with your local Lenovo support line, they may be able to offer a service for the unit.

 

Below is the link to the phone list where you can find these numbers




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yellowpage
What's DOS?
Posts: 1
Registered: ‎03-06-2019
Location: CA
Views: 348
Message 7 of 7

Re: Ideapad 720s won't turn on without ac adapter/battery fully charged

My 720s started having the same problem yesterday. Is there any solution?

 

Thanks in advance.

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