Original post by: Bart Van Dessel ,
Sorry 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...