Galaxy DX 88 HL jumping frequency

As the title says, I have a DX 88 HL that I just picked up that the frequency counter constantly jumps around on. It has no recieve, but I haven't tried transmit since it doesn't appear to be stable. There does appear to be a black block looking component that is located on the pcb underneath and slightly behind the frequency counter box that appears to be slightly burnt and there's a ground strap running from the frequency counter box to a pod on the board that is broken. I'm sure the ground strap needs resoldered, but I'm not sure what the black box compenent is.. I can't say I'm a master technician by any means, but with a little guidance, I'm competent enough to replace some parts if I know what I'm replacing. Any ideas what this component could be?