Step-by-step pictures of this process can be found here. Plastic cover on the top can be easily removed, allowing to access internal keyboard connector. I disassembled the keyboard and covered #25, #27 and #29 with adhesive tape (#27 is redundant since it's connected directly to ground on the motherboard). The reason for it is that in xx30 keyboard these pins are separated, but in xx20 one they are connected all together, shorting VCC5M_KBD (pin #25) to ground through the keyboard cable. Xx20 and xx30 keyboard pinouts are slightly different, so first thing you need to do is to isolate pins #25 and #29 (grab a schematic to see where they are). 2.3 Method 3: Make the xx30 palmrest keyboard nubs holes bigger.2.2 Method 2: Sand down the nubs to fit in the xx30 palmrest.2.1 Method 1 (X230 only): Replace the X230 palmrest with the X220 one.
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