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skersky
Paper Tape
Posts: 3
Registered: ‎04-20-2016
Location: RO
Views: 901
Message 1 of 3

Yoga 700 - 14 doesnt detect ac adapter

Hello , i have a Lenovo yoga 700,14 inch , i7 skylake , 8gb ram ..blabla. and  doesnt have warranty . 2 days ago it stopped detecting my power adapter. I buyed a new charger and still nothing. I also tryed to unplug the battery and plug back ..still nothing.. I have measured the voltage at the end of AC jack that connects to motherboard , and it gives 5v. 

 

The adapter is usb type with a small corner on the right side. It has 2 output voltages : 20v ...2A and 5.2V  2 amps. 

 

I only have 13% battery left on the laptop ..when is gone .. game over. 

 

Can this be fixed somehow? without replacing the motherboard ? (coz it costs over 400$ ..)..

 

Sorry for my bad english . Smiley Happy 

 

PS. i also tryed to power the laptop without the battery, only with the power cable and still nothing... Smiley Sad

skersky
Paper Tape
Posts: 3
Registered: ‎04-20-2016
Location: RO
Views: 865
Message 2 of 3

Re: Yoga 700 - 14 doesnt detect ac adapter

Here are some photos with measured voltage , and motherboard... help me please .. 

 

https://i.imgsafe.org/ff1b689.jpg

 

https://i.imgsafe.org/f9323a4.jpg

 

https://i.imgsafe.org/f985d22.jpg

 

https://i.imgsafe.org/faac730.jpg - charging port

 

https://i.imgsafe.org/fbd52cc.jpg

skersky
Paper Tape
Posts: 3
Registered: ‎04-20-2016
Location: RO
Views: 861
Message 3 of 3

Re: Yoga 700 - 14 doesnt detect ac adapter

I removed the dc jack from laptop and measured the voltage... still 5V . It should give 20v ,isnt it ? Is the jack broken or im doing something wrong ?  

 

The ac adapter has 2 output voltages ,5v and 20v .. i can plug my micro usb and charge my smartphone with it , but i dont know how it selects between this 2 voltages. 

 

I so on internet that this type of charges (usb with a small corner) has more pins that usual usb , and the charging port can also be used as usb when you dont keep your laptop plugged on the wall,so i think that this pins "select" the input voltage .. 5v or 20v.. Or... ?!

 

Here is the photo. https://i.imgsafe.org/cf7b623.jpg  

 

Help! Smiley Happy

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