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Pink monitor disease

By c.webb ·
When we retire a monitor, more often than not its because it becomes unusable owing to an overall pink/purple colour. This doesn't respond to any adjustment or cable-swapping, and there are no unusual magnetic or electrical fields present.
Althoughthe monitors are over 2 years old, it seems strange that about 60% of defective monitors have this problem.
Has anyone seen this before, or have any suggestions?

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by Paul D. Masley In reply to Pink monitor disease

I ran into this only in one section of my office. It drove me crazy for about a year. It did not matter what brand or the coast of the monitor. Ours changes to a brilliant purple with pink undertones. The biggest puzzle is that after disconnecting the monitor and leaving it off for sometime, then instaling it in another section of the building it would work fine. The problem mysteriously fixed itself. Just kidding. It appears that this was an older office and and it had the eight foot floursecent tubes. The starters were the silver cylinders that fired a spark. These were the only ones in the building. The office went through a retrofit and the lights were changed. I could not believe that the problem was something so simple but technical. I recovered one of the lights and set up a test, but I put the starter about three feet from the monitor and fired it all up. Four hours later, purple monitor. Have you electrican check out your lights.

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by c.webb In reply to Pink monitor disease

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by richard_barsby In reply to Pink monitor disease

Hi CRT's do age and if left on 24 hours a day the 2 years would seem about right sony trinitrons seem to suffer this very rapidly when it starts to go, the other ones to watch out for are samsung CRT's these seem to age very rapidly look at any monitor repair forum.

Hope this helps

Rich

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by c.webb In reply to Pink monitor disease

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by skutts In reply to Pink monitor disease

When monitors are manufatured, they are calibrated to certain colour 'temperatures'. This involves (amongst other things) adjusting the level of the red, green, and blue 'guns'. As green is the brightest of these 3 colours, it doesn't need to be set to such a high voltage. subsequently, as the monitor ages, the voltage levels drift, and the red and blue are more likely to drift by a greater percentage. As the primary colours for light are different to ink, lack of green causes the image to become magenta (pink/purple) This isn't always the case, but more often than not. Most new monitors allow the user to adjust the colour balance manually, so if you have tis option, just turn the green up (the more expensive have two sets of adjustments - bias and gain/drive [bias for the low level and gain/drive for the high lights])

Older monitors, however, have variable resistors (pots) on the CRT base to make these adjustments)

A specialist monitor repair company will be able to adviseyou more (If you are in Europe, it just so happens I work for one - any questions, just mail me!)

hope my explaination helps

Skutts

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by c.webb In reply to Pink monitor disease

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by csmith In reply to Pink monitor disease

The comment in Ans# 1 about the fields from the lights is valid.
The comment about component ageing in the other two answers are also valid.
You are going to have to troubleshoot.
One thing not mentioned, is that humid locations also cause problems, because of the increased corrosion puts resistance into the joints between the metal components.
Quality does count, only on the top end.
I have never seen a Nokia monitor do this.
Regards, Chris

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by c.webb In reply to Pink monitor disease

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by c.webb In reply to Pink monitor disease

Scutts,

What's your email please.

Chris Webb

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by maxwell edison In reply to Pink monitor disease

Many monitors fail when they lose their "purity". PURITY - The ability of the electron beam to hit precisely the correct phosphor color dot. If a full page of red color were shown on the display, impurities would result in a purple or greenish colorregion. These impurities can occur if the shadow mask has been damaged or if the screen has become magnetized.

It's the magnetized screen and the damaged shadow mask that causes the purple color.

Maxwell

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