That is some 'nasty' soldering.

I would suggest firstly to get a hold of the schematics and try to double check this yourself.  Given the 'quality' of some of the soldering I personally would be double checking EVERY repair.
Jumpering is fine as long as it goes to the right pin.  Going by the pics I'm not sure all of that is fuse damage.

Either way those pins need to be replaced.  In theory I wouldn't have thought a display board should get that 'hot'.  However running on the theory of the way the powerboard blew out, I am still betting on a surge.

I'll see what you may be able to use from my Police Force boards.

I would suggest - if you cannot repair (cost effectively) to consider a LED replacement.  But certainly go for repair first.

Is your CPU board booting ok?