Hello, I purchased a used Keychron K3 Max ISO at a good price. When it arrived, I noticed that the entire row of numbers and the keys you see in the photo don't work. The keyboard is new and shows no signs of use, so I decided with the seller to keep it and pay only €10.
Can you help me fix it? The RGB LEDs all work perfectly and the pcb is only a little oiled from the switches but I can't find any problems.
Here are the photos of the PCB:
