Monitor Is missing blue Color

[Grizybaer]

Hello, My monitor is missing the blue color, it has red and green. I'm pretty sure its the cable because it was kinked or twisted. Does anyone know how to fix it or know of any sites that could show me how?

Thanks

 

[alankool]

I dont think the cord being twinked or twisted would matter. Check to see if any pins fell out. Also if its a ctr monitor then maybe the gun that produces blue died if its an lcd then I have no idea.

 

[thraxes]

Had a monitor cable that did just that but with the reds. It too was kinked and twisted. While the monitor is on, try twisting the cable around, especially by the connectors to see if the color will com back intermittantly.

 

[XMan]

Check the plug, as was suggested, and see if any pins are broken or bent away from their normal positions.

 

[Xernex]

We had a monitor at school do that, but when you fiddled with the plug at the back of the screen, it went ok again, until someone bumped the table.

 

[KristopherKubicki]

I can almost assure you its the cable.

Kristopher

 

[alkemyst]

replace cable first....

My Hitachi Elite 751 actually had a electron gun that died though so it's possible.

 

[nanyangview]

it could be one of ur pins is broken, the pin for blue cyan colour

 

[Cadaver]

Since CRT monitors have only one gun, it's unlikely to be the CRT itself.
Replace the cable first. If it's not the cable, then it's either the video card or the circuit board inside the monitor.

 

[MarkHark]

Every single time I saw this same problem, either monitor cable was not fully inserted into VGA connector, or too much dust buildup was preventing proper electrical connection. In each and every case, cleaning both VGA port and cable plug with a brush, followed by spraying an appropriate contact-cleaning solution, and fixing the cable the way it's supposed to be done solved the problem.
Of course, if one of the wires inside your cable is broken, there's nothing you can do to repair it without damaging the EMI shieldind. If that's the case, you'll need to have the cable replaced.

 

[dkozloski]

Cadaver, color monitors have three electron guns, one for each required color. This applies to both shadow mask and aperature grill CRT's. It is quite possible that one, the blue, has failed.

 

[Cadaver]

Really? Well then color me corrected

I was thinking there were different color phosphors on the glass substrate (RGB, arranged in a triangle or a rectangle) and a single electron gun would sweep across and excite the proper phosphors. I thought three separate guns required three separate CRTs, like in CRT video projectors.

 

[ProviaFan]

I can almost assure you that it doesn't always have to be the cable. :frown:

Sometimes the cable is attached, and there's nothing you can do about it, and other times it really is the monitor. I had it happen to me twice: once, it was a bad monitor (no amount of twisting, straightening, or bending the cable did anything), and the other time, it was a bad BNC cable (in that case, the monitor was so old that I just got a new one instead of bothering to replace the cable).

 

[MarkHark]

Originally posted by: Cadaver
Really? Well then color me corrected

I was thinking there were different color phosphors on the glass substrate (RGB, arranged in a triangle or a rectangle) and a single electron gun would sweep across and excite the proper phosphors. I thought three separate guns required three separate CRTs, like in CRT video projectors.

In fact, both technologies do coexist. Some monitors share a single electron gun for all three colors, while others have three separate guns, one for each primary color.

I would not usually link to this site, but... oh, hell, there are not many good CRT reviews lately...

The Hevil German

Look at page 3 for details

 

[Cadaver]

Thanks for the link... I knew I wasn't loosing my mind.
From the article:

...two manufacturers make tubes with Trinitron technology - Sony, with the FD Trinitron, and Mitsubishi, with the DiamondTron. The PerfectFlat by ViewSonic is actually an adaptation of the latter. The main difference between the two is that Sony uses three electron guns for the three basic RGB colors and Mitsubishi only uses one.

 

[tweeve]

I had the Green electron go in one of the monitors at work.
I know its not the cable i checked that.

 

[LED]

I'm thinking it's the Cables as well and had a similar experience happen before. My fix was to unplug it, carefully remove the outer case and get a new cable for it which plugged right in...Bingo!!! I can see clearly now

 

[randumb]

I'd just get a new cable. I'm not very competent at tweezing twisted wires .