Half of the keyboard lighting not working after disassembly

I replaced thermal paste on my 2020 Macbook Pro A2251. Everything seems to work fine except half of the keyboard lighting. I suspect I didn't connect the cable properly but unable to find which exactly cable. I can't find a disassembly guide for this particular model anywhere and guides for older models didn't help.

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Check near both the fans, I think there are 2 connections for the BL

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Thank you very much! I'll try to reconnect this cable. Do I have to disconnect the battery just for this?

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