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What's DOS?
Posts: 1
Registered: ‎07-05-2018
Location: US
Views: 133
Message 1 of 2

Legion Y720 Intermittent Power Loss

Two days ago my Y720 lost power while I was using it for normal office-type work and immediately cut off despite being connected to AC.  The computer was able to boot back up immediately so I hoped this was a one-time occurance.  Early yesterday evening the same thing happened, but the computer refused to come back on this time.  Additionally, the white light next to where the AC adapter is connected was not on even when I tried different plugs in the house to be certain.  Even though I thought there was plenty of power left, I wrote this off as the AC adapter had  died and the battery had fully drained (I had seen something similar on the forums here).  I tried booting again this morning, but no luck.  After work, I went to a Lenovo approved vendor and asked them if they had a spare AC adapter on hand to try and plug-in to verify whether it was just my AC adapter, or something worse.  They plugged one in and the white light came on with no issue.  I looked to buy a new AC adapter there, but they didn't have a Y720 one in stock so I thought I would be buying one online tonight once I got home.  Once I got home though, I gave my AC adapter (which I thought was broken) and my computer a try -- it turns out both work perfectly fine again.  I'm at a complete loss for an explanation.  I understand powershutdowns due to load / temp / etc and even surge electric scenarios but none of those work consistenly with the on-again / off-again that this computer has been though.  I've run all of the sytem mechanic / lenovo vantage and other utility scans I have -- no issues found there either, but they wouldn't find a hardware power failure like this if there was one anyway I don't think.


Any ideas appreciated!

Sr Support Specialist
Posts: 8,343
Registered: ‎11-30-2015
Location: PH
Views: 106
Message 2 of 2

Re: Legion Y720 Intermittent Power Loss

Hi Robert_Lenovo1,


Welcome to the Community Forums.


I would suggest that you take time to back up your files while there is still opportunity to do so. Give technical support a call and report the intermittent power loss issue.


In warranty repair can do stress test and likewise check for dc in port contact inssue if not the motherboard.





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