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silverslayer
Paper Tape
Posts: 6
Registered: ‎12-11-2019
Location: US
Views: 322
Message 1 of 10

Yoga 710 not charging or showing plugged in with new AC power adapter and no conservation mode

I recently noticed the battery was around 50% when I last used it. I thought my wife forgot to plug it in so I plugged it up. The next time I went to use it, I noticed it was a little lower, but I had removed the plug from the wall. I assumed it was the power adapter, so I ordered a new (OEM) unit directly through Lenovo. It made no difference, the computer does not charge or recognize the power adapter is "plugged in." I tried some online solutions and verified conservation mode was off. I also performed a battery diagnostic test and it found no issues. I tried holding the power button for 30 seconds and while I did hear the fans turn on shortly, it didn't change anything. I also tried the NOVO button, but it did not seem to do anything at all. Lastly, I even removed the bottom casing cover and pulled the battery for a few minutes, but again not change. My battery is now extremely low (using my way older HP unit now) and not sure how much more I can do without depleteing the battery where I cannot power it to make any changes.

 

Is there any other way to power it besides the AC adapter?

Any suggestions on what is going on? Could it be the charging circuit on the battery? I don't want to make another assumption and replace the battery if there is something that will prevent that battery from charging as well.

 

Thanks,

Kevin

Support Specialist
Posts: 489
Registered: ‎11-04-2019
Location: PH
Views: 312
Message 2 of 10

Re: Yoga 710 not charging or showing plugged in with new AC power adapter and no conservation mode

Hi @silverslayer,

 

Welcome to the Community,

 

Regarding the issue, It's possible that the power board which the DC port and battery is connected is the problem. Check if there is physical damage like missing plastic or bent pins as the computer should still turn on using the AC adapter only with or without the battery connected.

 

Hope this helps and let us know how it goes,

 

Jeremy



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silverslayer
Paper Tape
Posts: 6
Registered: ‎12-11-2019
Location: US
Views: 303
Message 3 of 10

Re: Yoga 710 not charging or showing plugged in with new AC power adapter and no conservation mode

I tried to power it with the cord without the battery and it would not turn on. I'll take a look, thanks!
Support Specialist
Posts: 489
Registered: ‎11-04-2019
Location: PH
Views: 281
Message 4 of 10

Re: Yoga 710 not charging or showing plugged in with new AC power adapter and no conservation mode

Hi @silverslayer,

 

Let us know how it goes Smiley Happy

 

Jeremy



Did someone help you today? Press the star on the left to thank them with a Kudo!
If you find a post helpful and it answers your question, please mark it as an "Accepted Solution"! This will help the rest of the Community with similar issues identify the verified solution and benefit from it.

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silverslayer
Paper Tape
Posts: 6
Registered: ‎12-11-2019
Location: US
Views: 273
Message 5 of 10

Re: Yoga 710 not charging or showing plugged in with new AC power adapter and no conservation mode

I didn't see any physical damage and the plug looked to be secure to the board. I had to leave, but will check for power through the harness to the board when I return. 

Thanks,

Kevin 

silverslayer
Paper Tape
Posts: 6
Registered: ‎12-11-2019
Location: US
Views: 244
Message 6 of 10

Re: Yoga 710 not charging or showing plugged in with new AC power adapter and no conservation mode

I checked power and it appears there are two separate circuits. Both circuits have 20v. Even the board side of the connector shows 20v so it is getting power to the board. Any ideas?

Thanks, 

Kevin 

silverslayer
Paper Tape
Posts: 6
Registered: ‎12-11-2019
Location: US
Views: 222
Message 7 of 10

Re: Yoga 710 not charging or showing plugged in with new AC power adapter and no conservation mode

I unplugged the battery and I do not have any voltage at this connection. With the battery connected the two pins on the left appear to be grounds, from the third pin I get 3.4v, 0v, 3.4v, 3.4v, 7.4v, 7.4v. This is the same whether I am plugged to the power supply or not.

 

What would prevent power from reaching this connection? 

 

Thanks, 

Kevin 

Support Specialist
Posts: 489
Registered: ‎11-04-2019
Location: PH
Views: 160
Message 8 of 10

Re: Yoga 710 not charging or showing plugged in with new AC power adapter and no conservation mode

Hi @silverslayer

 

It's a possiblity that there's a short on the connection and power only jumps when the connection of the battery to the board is connected. It's really hard to say and usually with cases like this a technician should physically look at the parts for the issue. If it's still under the warranty you can contact support https://support.lenovo.com/uu/en/contactnow?linkTrack=homepage%3Ac1%3Ar2%3Acontact_us or if not, check for a local technician near you.

 

Regards

Jeremy 



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silverslayer
Paper Tape
Posts: 6
Registered: ‎12-11-2019
Location: US
Views: 149
Message 9 of 10

Re: Yoga 710 not charging or showing plugged in with new AC power adapter and no conservation mode

Unfortunately, it is not under warranty. It hasn't been used all that much so it really surprises me that I'm having issues with it. Do you know if it is possible to charge via USB or is the barrel connector the only option? Is a pinout of the motherboard available? 

Thanks, 

Kevin 

Support Specialist
Posts: 489
Registered: ‎11-04-2019
Location: PH
Views: 131
Message 10 of 10

Re: Yoga 710 not charging or showing plugged in with new AC power adapter and no conservation mode

HI @silverslayer,

 

Unfortunately it's not possible via USB and the only documentation available for the public taht i can provide you is the Hardware Maintenance Manual. Just enter your serial and MTM so it can give you the specific documentation for your model.

 

Regards 


Jeremy



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