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Lvonn
Fanfold Paper
Posts: 17
Registered: ‎06-30-2018
Location: MX
Views: 467
Message 181 of 216

Re: yoga 910 battery not charging

what did they do to it?
strangeintp
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Posts: 8
Registered: ‎02-03-2019
Location: US
Views: 463
Message 182 of 216

Re: yoga 910 battery not charging

Update after using the Anker PD charger now for a few days.  Indeed, it does not seem to be charging very quickly Smiley Sad  It took all night to recharge from a deep discharge.  Before putting it away for the night, I was doing a major system upgrade (Linux Mint 18.3 to 19) and I watched the battery drain from around 20% while plugged in - hoping the upgrade would finish before the laptop completely died.  Around 15% charge I thought to turn the display brightness way down, which slowed the discharge rate but didn't stop it.  Luckily my upgrade completed before the machine died, but it was close.  Bottom line, it doesn't charge as fast as it discharges.

Ssoniccomputers
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Posts: 27
Registered: ‎09-19-2018
Location: US
Views: 454
Message 183 of 216

Re: yoga 910 battery not charging

A quick update:  I had replaced the failed mosfet fixing the charging system and a month later it failed again.  I was thinking it would be the same component at fault but it turns out it was the flex cable from USB C board to motherboard, loose connection..  Tightened it up and works fine.

Lvonn
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Posts: 17
Registered: ‎06-30-2018
Location: MX
Views: 440
Message 184 of 216

Re: yoga 910 battery not charging

that is encouraging. how far out of warrenty were you and how long did it take?

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sl55
Paper Tape
Posts: 4
Registered: ‎02-19-2019
Location: AU
Views: 384
Message 185 of 216

Re: yoga 910 battery not charging

Hi there, quick question where is mosfet 19 located,  on the motherboard? or the Type C  power board, thanks

Ssoniccomputers
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Posts: 27
Registered: ‎09-19-2018
Location: US
Views: 382
Message 186 of 216

Re: yoga 910 battery not charging

It is not on the USB c board, it is located on the bottom side of the motherboard, right next to the 17 mosfet, I'll dig up a picture and show you.  I had the whole repair process outlined with pix and everything on this site but I think Lenovo tossed it to try and avoid complications due to their fault in the engineering process leading up to these failures.

 

sl55
Paper Tape
Posts: 4
Registered: ‎02-19-2019
Location: AU
Views: 377
Message 187 of 216

Re: yoga 910 battery not charging

typical of lenovo trying to bury their incompetence, thanks a picture would be great 

Ssoniccomputers
Fanfold Paper
Posts: 27
Registered: ‎09-19-2018
Location: US
Views: 375
Message 188 of 216

Re: yoga 910 battery not charging

Picture sent.  many videos online on how to test a mosfet in circuit such as this one... https://www.youtube.com/watch?v=gloikp9t2dA

 

Ssoniccomputers
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Posts: 27
Registered: ‎09-19-2018
Location: US
Views: 372
Message 189 of 216

Re: yoga 910 battery not charging

 

20180918_200335.jpgPQ19 component at fault

 

Ssoniccomputers
Fanfold Paper
Posts: 27
Registered: ‎09-19-2018
Location: US
Views: 371
Message 190 of 216

Re: yoga 910 battery not charging

More info here;  https://www.badcaps.net/forum/showthread.php?t=70313

 

I'm supplying a pic of the actual controller chip that is either the cause or directly connected with the cause of the issue causing the mosfet to fail.Capture.PNG

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