Sony question: "Black 'n Blue"

[AlwaysLyceum]

Just a quick question. I recently bought a 1987 19" Sony Trinitron, model KV-1926R, and is a part of my TV-T, which there is a picture of it in another thread. Anyway, this is the only TV that I have in which colors that should be black are more of a navy blue. What type of problem is this? I'm not familiar with anything inside TVs whatsoever, but I'm pretty sure it has nothing to do with the front control knobs (sharpness, bright, color, hue). I know you really can't take pictures of TV color problems, but I'm uploading these just for kicks really. BTW, I don't know how to insert pictures within the body of a threat without it already being on the internet. So, anyway, why are black suits navy blue on this TV?