What is this component marked LB1704 with a diagonal rectangle?
And what do the marks '1' & '2' refer to? Power direction?
I'm guessing it's some form of fuse or resistor or fused resistor. But before I go removing shields to inspect and meter out the component I'd like to know what I'm even dealing with here if someone can shed some light.
It's almost surely a ferrite bead. See the linked SE question for examples of the range of symbols used.
There is no information on the specifications, the "LB1704" is a designator, just as "C1712" does not give you information on the capacitance, dielectric, voltage rating or package size. 1 and 2 appear to refer to pin numbers. In a CAD package all parts will have pin numbers, but often they are suppressed on the schematic, either because the part is symmetrical (like a resistor) or because the same information is carried in the schematic symbol (like a diode) or maybe they use more useful pin names such as E B C. There may be a good reason for the pin numbers (perhaps the part is mechanically asymmetrical) or perhaps the person who created the symbol simply didn't bother hiding them.
