Lenovo "lavie z" laptop- overvoltage on usb hub fried motherboard help
Lenovo (made by NEC) “lavie z” (aka model hz550) laptop, accidentally plugged in the wrong power cord (12v dc instead of 5v) to a powered external usb hub that was plugged in to a onboard usb port for 1 second, got a little burning smell, and laptop shut off. I still see charging led when plugged in, and another led comes on for a second when I push the power button, but no other signs of life.
I have enough experience with small/component level circuit board repair, reflowing, and similar to not cause additional damage & have a proper workstation/ micro soldering setup and tools etc , but most of my experience is on (older) cell phones.
I have examined the motherboard carefully under 10x and I didn’t find any visibly damaged or burnt areas. I’ve cleaned with 99% alcohol and an ultrasonic cleaner & reassembled. I’ve attached a photo of motherboard.
If anyone can point me in the right direction on where to look (on the motherboard for what might be damaged), solutions that might involve physically disabling the onboard usb hub/controller, etc, OR any resources that might help identify components on this motherboard, I’d VERY greatly appreciate it. Thanks in advance!
note: apologies about selecting the wrong model , ifixit doesn’t have this model “hz550” aka “lavie z” or hz750 (similar, lavie z 360 touchscreen) as an option