• lenovo yoga 3.14 laptop and will not power on and or charge

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lenovo yoga 3.14 laptop and will not power on and or charge

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  1. Topic title should contain: the device's manufacturer, full model and the brief description of problem.
  2. Topic message should contain: the PCB marking code (required in case of hardware repairs), an extended description of problem, things you have checked/replaced/measured, your conclusions and the question. If you are not able to find the PCB marking code, please read THIS TOPIC. If you still cannot locate the PCB markings, please upload a clean, both-side photos of the mainboard - it is required to remove any films, modules or brackets possibly covering these markings.
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#1 lenovo yoga 3.14 laptop and will not power on and or charge

by Oyama65 • 12 September 2024, 02:23
Hi all,
i have an lenovo yoga 3.14 (80jh) laptop and will not power on and or charge,
Mainboard model: BTUU1 NM-A381 REV: 1.0 measured the battery voltage 0.00v dead flat.
checked for shorts not see anything, checked mosfets, fuses and caps around battery and input. ive missed something i managed to charged the battery, once charged placed the battery back into the laptop and powered up.

i wasn't getting negotiating voltage 19v only 5v. so i replaced the pu101 (BQ24715RGRR), once replaced i was getting negotiating voltage 19v but blinking white light 3sec interval. battery was charging until, mosfets PQ301, PQ302 both went up in smoke as well as PU301 (TPS51716RUKR) was so hot to touch. replaced all components. battery had some charge laptop came back to life.

i have replaced the battery as it was degrading and tried another powerpack, still have the original issue.

I'm an extreme newbie to smd electronics and electronic in general. but willing to learn.

Any guidance will be appreciated.

Oyama

Re: lenovo yoga 3.14 laptop and will not power on and or charge

by Google Adsense [BOT] • 12 September 2024, 02:23

#3 Re: lenovo yoga 3.14 laptop and will not power on and or charge

by Oyama65 • 16 September 2024, 02:12
Update...
i removed the new battery, and charging cable pressed and held the power button for about 60sec. plugged the charger laptop came alive.
fasten the mb back into the laptop everything was working perfectly until i opened the laptop screen further, power then when off then closed the screen a bit pressed the PB came back again. maybe a dry joint or a crack on the board. spent over 2hrs cannot fined a thing. any suggestions

Re: lenovo yoga 3.14 laptop and will not power on and or charge

by Google Adsense [BOT] • 16 September 2024, 02:12
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