I just can't stop!!

[wilkes85]

Originally Posted by zenith2134

As far as bias is concerned.....when using the set-up line, display an all white image or use snow, with the color turned down, tint at half, autocolor off, bright and contrast at half.

The least amount of bias/drive necessary to get a bright white line is the way to get this done. Too little drive and it'll look washed out; too much and it'll burn away the CRT quicker.

Use of a mirror is key...also helps to make sure you don't get zapped when you're back there, trying to lean over the set to see the screen.

I tried adjusting the colour bias that way, but the picture is still horribly green. I got my other RCA right next to it, on the same channel as a guide, and I can't get it to look half diecent.

Is this just a sign of a worn out CRT? This TV is 28 years old, after all.

[zenithfan1]

Sounds like the CRT is dying.

[wilkes85]

Originally Posted by zenithfan1

Sounds like the CRT is dying.

That could probabally be it. I'm comparing it to a 13" XL-100 about the same age. The 13" has perfect grayscale, but the best I can do with this 25" is get it sepia-toned. I just can't get the grayscale right.

I didn't think to compare it with another TV before. I thought I was crazy to think that everything still looked green lol

But I guess this ol' thing has had a good run. I'll still be watching it up until it goes completely. Then I'm gonna set it aside, and if it's possible by then, I might even get a new CRT installed in it lol, because even when it stops working, it's still got some nice woodwork on it.

[radiotvnut]

Even if the tube is bad, a good used one should not be hard to find. '80's XL100 consoles are still a very common find. There are 2 of the single knob tuner type at my local SA right now.

[zenith2134]

Well, its worth a shot, but check the video output amps (most likely on the neckboard on this set) but if both red and blue are weak then its probably a toasted crt indeed.

[wilkes85]

Another thing. Is a coloured blotch in the screen after the set is turned off, a sign of a bad CRT as well? My grandma has a 25" XL-100 console as well, and when you turn it off, this coloured blotch stays on the screen for over half an hour. But you can only see it in the dark.

This blotch is mostly pink, with a blue and green border. It's located at the centre of the screen, just to the left.
I've seen this on consoles with bad CRTs. I was gonna buy a big Hitatchi console years ago at a second hand store, and I turned it on to test it, and all there was was this coloured blotch.

[Kiwick]

My 1979 Philips displays that splotch when i turn it off, but its CRT is as strong as it can be, it's simply a quirk of this particular Philips chassis (KT3), here's a vid of it:
http://www.youtube.com/watch?v=NijEGMxUEOU

I think it has more to do with the lack (or failure) of HV bleeding circuits and/or beam killer circuits in some designs than with the conditions of the CRT.

[wilkes85]

Originally Posted by Kiwick

My 1979 Philips displays that splotch when i turn it off, but its CRT is as strong as it can be, it's simply a quirk of this particular Philips chassis (KT3), here's a vid of it:
http://www.youtube.com/watch?v=NijEGMxUEOU

I think it has more to do with the lack (or failure) of HV bleeding circuits and/or beam killer circuits in some designs than with the conditions of the CRT.

WHOAA!! I wish my TV did that LOL

[mbates14]

I used to have a TV that done the very same thing. matter of fact, i believe it was an old 70s solidstate portacolor. it also randomly lost focus at times. never knew why.