That IC between grey wire and tip of your multimeter is a swiching regulator (I suppose LM2575 or so), measure the voltage on the pins. It produces 5V of 12V. Really?
I do not think, the panel does not have any fuse. Search component written F1 on the pcb. It perhaps does not seem to be a fuse. It sometimes looks like a green resistor or a small white brick, newest models are opaque plastic with small orange spot inside.
Have you got a photo of MUCH better quality of the panel?