Trouble with Casio 880B

Worked fine until I think I crossed two pins with my multimeter on the four pin connection going to the back light at CN710 to CN950. Now I get no response from anything. Anything I can do to get it working again? Found a schematic, though a little hard on the eyes.

SMD fuse- ref. FU100 location bottom LHS on page 5 of the manual.
Use a bit of 500 mA fuse wire to start with (just a wild guess on the value)

edit- just out of curiosity, if it "worked fine" why start shorting things out

I'm using the screen for a project and was trying to trace a few lines. Wouldn't of have been looking if I found that manual in the first place.

Thanks for your help, jumped the fuse and it's back on.