I have an F199B amw LCD monitor that lost the normal display and went to only a yellowish/white screen. I cannot find data sheets on some of the parts. For instance, one part that looks like a surface mount transistor has a marking of RKM and checking with a diode checker get only a diode indication between two points and nothing with the third point. Thought at first it was a bad transistor but found another one on the circuit board with the same marking and the same behavior. If this is not a transistor, what might it be?