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Which fuse is responsible for backlight on Lenovo Thinkpad T14 Gen 3

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    Which fuse is responsible for backlight on Lenovo Thinkpad T14 Gen 3

    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 I found that there are possibly more fuses on the back side of the motherboard, once again any suggestions would be appreciated.

    I have a soldering iron and hot air station, but I bought it recently. I soldered over the fv1 fuse and then nothing happens when I plug it in, after removing the solder it comes back on.

    Also should I buy flux 😅.

    #2
    Link to schematics https://www.badcaps.net/forum/troubl...nm-e441-rev1-0

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      #3
      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.

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