I was able to check the schematics using Flexbv free version, and it seems like FV2 is responsible for touch. This makes sense, because touch was not working when I was testing the laptop either. Let me know if you have any additional thoughts, I will try to update tomorrow.

Link to schematics [url]https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/troubleshooting-laptops-tablets-and-mobile-devices/schematic-requests-only/3273315-schematics-boardview-for-thinkpad-t14-gen-3-amd-nm-e441-rev1-0[/url]https://Link to schematics [url]http...1-rev1-0[/url]

I upgraded display from HD to UHD recently, and I think I did everything right, battery was disabled in BIOS, and removed, yet the screen has no backlight. Both the old and new display behave the same way. I checked the motherboard and I see the fv1 fuse, and a fv2 spot for a fuse, but it's missing. Does anyone have any information on whether fv2 is responsible for backlight, or why it's missing? There's a schematic posted somewhere on this forum, but I can't view it as I don't have the hardware right now, since the laptop screen is broken and I run Linux.

Also from further search...

Hello , I study discrete math and algos, and I'm here because I upgraded the screen and my backlight doesn't work. I'm trying to figure out if it fell off bc of dry solder, or if I did something wrong.

Anyways I always liked tinkering with electronics and the Thinkpad is a AMD T14 G3 for anyone wondering. I run Arch Linux on Hyprland and find it very productive. Thanks for welcoming me in.