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What's DOS?
Posts: 2
Registered: ‎05-29-2019
Location: US
Views: 83
Message 1 of 3

Advanced motherboard question

I found this Yoga 2 just collecting dust in my workshop, it would not power on or show any signs of life


I thought perhaps the charger could be bad so I used a friends who has a different model of the thinkpad yoga. connected it but nothing happened. So I took out the battery, pressed power for 1 sec x10 then held for 30 sec. During this time there was a spark on the motherboard


After I took my finger off the power the power led was blinking orange. I immediatley unplugged the charger my co-worker lent to me


Out of curiousity I plugged the original charger back in and seemed ok. Eventually the orange turned white and I was able to power on... it ran smooth with no issues


I started using it and noticed a burning smell so I took it apart, verified fans worked. I tried to run diagnostic but the fans test was grayed out (sounds like a common thing with lenovo)


I took apart the motherboard and eventually found where it happened. When I pulled out the mobo undernear where the bottom of the keyboard is I found the spot where it shorted out. It was the spot where the square metal peice was touching


Question is... what is that square piece exactly? I'm trying to figure if its safe to use, replace or just junk the whole laptop


Pictures for referenceIMG_20190529_150650.pngIMG_20190529_150712.pngIMG_20190529_150730.png

What's DOS?
Posts: 2
Registered: ‎05-29-2019
Location: US
Views: 79
Message 2 of 3

Re: Advanced motherboard question

I was told this part was the power regulator. Though I am not sure if that is still safe after sparking like that

Social Support Agent
Social Support Agent
Posts: 173
Registered: ‎09-06-2018
Location: PH
Views: 48
Message 3 of 3

Re: Advanced motherboard question

Hello notKorey! 


Welcome to the Lenovo Community Forums. That is called the voltage regulator module which may have been shorted. To know more about Handling ESD:


There is always potential for damage, a discharge via short is entirely possible.



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