Chosen Solution
I stupidly bought and plugged in a cheap power charger to my Yoga 900. It was going to be my portable back up. It immediately shut the computer down. The charging light was NOT lit on. I then tried to used my OEM charger. The light still doesn’t turn on. I pulled the back cover off and took the battery off. Held to power button for a minute to dissipate the capacitive charge. Reconnected the battery. Still NOT on. Charging light still NOT lit. I heard that the CMOS may need to be replaced? I dont think this yoga 900 comes with one? The manual said the system board needs to be replaced? Update (07/31/2017) It looks like the power port connects directly to the system board. See attached pictures from the Lenovo Hardware Manual Link: https://download.lenovo.com/consumer/mob…
Worked like a charm!! I had a problem with my Yoga not starting up. Would boot for a few seconds then turn off. I purchased the tools to open my laptop then just disconnected the battery, reconnected it and problem solved.
Hi @nick3470 If by ‘sweet spot” you meant that the charger had to be connected just so for it to work, perhaps the DC-In jack is the problem Try replacing it and check if that resolves the problem for you. If you have a Lenovo 900-13ISK2 here’s the hardware maintenance manual that may be of some help. Go to p.46 to view the necessary pre-requisite steps and then the procedure to replace the DC-In cable. The link for the cable is only to give an idea of the cost of the part and what it looks like. There are other suppliers that my suit you better. Just search for 5C10K48429 to get results
To fix it I replaced the mother board. That’s no separate or daughter board I could take apart. It’s all hard soldered into the main motherboard. Also, the I/O board was fine.
Well I am sad to say, if you did not use an OEM or charger with the same voltage you probably fried your laptop. Your system board will need to be replaced and more than likely your SSD if it was fried. If you have enough money it is cheaper to replace it entirely than to pay someone to replace the entire board.
