The display panel on my stereo (Hitachi KMS-3611ZW, in a '83 280ZX) is out--none of the numbers light up, or anything else. BUT, I can sometimes get it to light up by hitting it on the case with a screwdriver. It flickers then, so I assume there's a loose wire or dirty contact somewhere. All the elements (that are supposed to be on, i.e. the ones that make up whatever's displayed) come on at the same time, and light at the same intensity, so it's probably a power connection rather than a signal line. I understand this is a common problem - it happened to my friend's '81 as well. Anyone know how to fix this, what contacts to clean, etc.?