Rear projection "cracked" red gun

Have you looked down into the projector tube through the lens with a flashlight and noticed anything odd looking? Stuff like that usually shows up pretty easily and you can have a good look down in the tube through the lens if the fluid isn't too cloudy. I've looked in mine after cleaning and a repair and noticed fibers or even hairs in the fluid right from the factory. These are magnified by the lens but otherwise too small to appear on the screen.

I'd have to pull the screen to look at it from that angle, and I'm selling the tv so I don't really want to go through the hassle. I'm selling to a co-worker, so I'm really mainly looking for a "what to expect" From what I can tell they are just going to have to deal with the discoloration which they don't mind for the price they got. I'm just making sure something more serious is not going to come from this and have her breaking my door down :)

Well, the tube is certainly not cracked - it wouldn't work if it were.

You burned the line into the phosphor of the red crt by turning up the red drive too high. I remember seeing a Hitachi service bulletin out to put with the adjustment manual warning not to do exactly what you just did.

The set would go into protect shutdown when the drive was too high. The shutdown would collapse the horizontal drive, but the drive was so high on the red that it was at so high a level it was still driving the tube when ti collapsed.

The mark will never go away.

One of the other tech's where I worked did exactly what you did by accident. The tube had to be replaced.

It looks like you burned the phosphor, the tube isn't cracked but it may as well be. It looks like there was a momentary loss of deflection, perhaps a poorly designed protection circuit didn't kill the beam before shutting down the horizontal deflection.

Well it's possible you've caused some damage that will come back to haunt you.

Samsung had this protection problem IIRC.

So if it's burned phospor, is it as harmless as screen burn in? The person who now has the TV does not mind the line, I just want to make sure that nothing else is going to break down the line b/c of this issue.

Screen burn and burned phosphor are one and the same, yes, it's harmless, just ugly.