Answer to: bottom row of keys not workingI don't know what damage this bluetooth AZERTY KYBD that was given to me had (probably liquid), but the : WXCVBN, and left command keys were not working. Hung it out to dry, punched a little harder on these lower keys, and, especially, '''carefully cleaned the flatcable at the receptor end with isopropanol (IPA). '''bold text'' Lo and behold, coming to you from this KYBD! Good luck to you! Hammer away, I'dsay.
Answer to: Faulty power supply, need to replace DiodeSorry for my late post, but I've come across this in the course of other research. Someone asked me the exact same question about the exact same component some days ago, but with a better picture. If I'm not mistaken, this component is identified on the silk screen as "J6", being "jumper # 6". Indeed it seems to be a simple wire bridge with a ferrite core meant as RFI screening. Measure its resistance, on- or off-circuit: it will measure about 0 Ohms in both directions. Definitely not a diode. What the leaking white putty is, I don't know, however. Not the cause of a malfunctioning PSU in my book...