CRT Colors & Wear?

[Outland]

Hey guys,

I thought I'd start a new thread with a relevant title, as the old one really changed topics.

I've finally gotten the Trinitron running and displaying a picture.

However, the picture is kind of red. Backing down the color control, doesn't fully get get rid of the colors, as most colors still peek through (mostly red, but blue, green, etc. too). The picture's fine otherwise, clean and clear. It just comes off as very warm.

What is causing this? Worn guns?

[mstaton]

Sounds like the drive or screen controls are turned up too high. Back off the red a little and see how it looks. If it looks better, then try the green and blue. Sounds like a grayscale adjustment is in order.

[Outland]

How do I do that?

[mstaton]

The controls are probably on the crt circuit board. if its new enough, it will be in the service menu. The controls will be labeled. Sometimes the controls are color coded, red green blue knobs. I'm not familiar with that exact set but they are all similar. If it's in the service menu, you can read about it online. You will need a sony remote to get into it. Be careful, you can mess things up if you don't know what you are doing.

[Outland]

It has a primitive OSD, but just for volume and picture.

If I have to mess with it while it's on, I'd really rather leave it. I have no idea what I'm doing in there.

[mstaton]

Yes it will have to be on. Maybe best to leave it until someone can help you out.

[Outland]

Makes sense. Thank you though, at least I know it's curable now.

[old_tv_nut]

Originally Posted by Outland

Makes sense. Thank you though, at least I know it's curable now.

Just a note to say that a picture is always helpful. When you don't know what the problem is, it's easy to accidentally describe it in a misleading way, and it may be better to show it to the experts than try to tell it in words.

[Outland]

Sure thing. Here are a few pictures.

[lnx64]

Oh come on, he's just Zoidberg in disguise!

Seriously, what does a greyscale pattern look like?

Where do you live? In Florida? I'll adjust it for you. If there's one thing I have a good eye for, it's 65k.

[mstaton]

turn the color down slightly and turn the tint toward green. That might help some

[jr_tech]

A shelf under my heavy old Trinitron did the same thing, until I screwed a couple of full width 3/4 inch angle iron lengths to the underside... Painted flat black, they were pretty unobtrusive.

jr

[old_tv_nut]

Originally Posted by lnx64

Seriously, what does a greyscale pattern look like?

Agree - you have to start with a good black and white picture. Turn the color completely off and see if the picture is still pink (especially in the shadows). If so, the tracking (G2's or "cutoff" or "background") controls probably need adjusting. Once the tracking is OK (shadows are same color as highlights), drives can be adjusted for a warmer or cooler color temp (still with the color turned all the way down). [NOTE There may be some interaction between the G2 and drive settings.]

Once you have good black and white, you can turn the color back up and see if there is any problem there.

[freakaftr8]

The CRT might be weak or weaker. There is a fine line where the emission gors south to the point where it starts to effect picture and color quality. If you have any smearing of whites like letters and the such on the screen and turning the contrast (picture on sonys) down takes it away, you could have a weak CRT. Usually Sonys come from the factory with near perfect greyscales, so if the controls were untouched, which are located on the CRT neckboard, and not user servacable unless the back is removed on this model, then I would say the CRT may be getting tired. Now yes like others said you can adjust it out, but thats temporary. There are some instances I have run into in the past where a poteometer has a flat spot on it where the slightest turn will change drastically. But a usual telltale sign of a weak trinitron is color smearing (or bleeding) (usually red) around the whites.

[lnx64]

I'm not really seeing smearing here.. I'm just seeing the reds being pushed far too much..

He hasn't even shown us a greyscale pattern yet..

A weak CRT would do this kind of smearing: http://img.photobucket.com/albums/v3...ghcontrast.jpg

I'm just not seeing that here in his pics.

Heck, it may not even be the CRT itself, it could be something in how it decodes NTSC (or PAL, depending on region).. I've seen that happen too.