Insigna TV - GREEN????

With many CRT sets - IMHO most noticeable with Trinitron tubes - the red gun ages more than the others due to being driven harder than the others. Resulting in the tint you describe.

I dunno your particular model, but a pro monitor has six adjustments for grey scale tracking, R, G and B foreground (whites) and R, G and B background (blacks).

Domestic TVs can have one of these colours non adjustable. Some do this balance automatically.

To find out about your model you need the service instructions - Google for the model and grey scale tracking. If this happened gradually it can likely be adjusted. If it happened suddenly it might mean a repair.

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    Dave Plowman        dave@davenoise.co.uk           London SW
                  To e-mail, change noise into sound.

This is likely due to a weakening of the red and blue guns.

Most sets have controls to set up the picture tube, to adjust for normal sample-to-sample variation. Assuming your set has these controls, you can do it yourself. But you have to know how to do it. Once you know what's involved, it's trivial, but it takes too long to explain it here. Perhaps someone can point you to a Website with instructions.

PS: Your son should not have a TV in his room. Toss the set.

Hmm, maybe my memory is going with old age but...

1) The main point with the Trinitron tube was it only had one gun, thus providing a better/different picture because there were fewer color alignment problems. It used that special shadow mask and was the first crt to use rectangle shaped color landings instead of the standard round hole delta pattern everyone else used. 2) The blue gun (in non-trinitron tubes) was the one always pushed the hardest because it's the color the human eye in most people was the least sensitive to, so it needed the highest gain.

And I'm sure on #2, I remember the shorting alligator clips used on some of the color generators that went into the grids of R/G connections on the picture tube. You would kill off the red/green and bring up the blue just below the point of blooming, then bring up the red/green to match and set the gray scale.

Unless Sony came out with a 3 gun Trinitron towards the end (after I got out of the tv repair biz), all Trinitrons only had a single gun.

-bruce snipped-for-privacy@ripco.com

If anything, red was the minimum of the three.

(snip)

Sony advertises one gun in the Trinitron because PART of the gun is in common with the three colors. It still has three cathodes and heaters however. Just look at the neck of one sometime. As far as the drive for the individual colors, that is determined more by the phosphor efficiencies than the human eye.

David

If it only had one gun there'd be only one colour. But if you prefer it's one gun with three barrels. ;-)

That matters not - it's the efficiency of the phosphors which determines the drive needed and red is the least sensitive.

Different makers use different methods. Early Sony sets had an external green gain control to make compensating for tune aging easier.

Not so, IMHO.

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    Dave Plowman        dave@davenoise.co.uk           London SW
                  To e-mail, change noise into sound.