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Yellowish green area in middle of picture

What is the solution for a yellowish green area near the center of the picture?

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3 Answers

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  • Master
  • 2,712 Answers

It is most likely because you have dirt/sediment in the CRT liquid coolant. If you look inside the tubes with a flashlight you can see a fungus like growth growing inside and dimming the light output of the CRT tubes. You will have to change the coolant. Try this:

1. Tip the TV set so the expansion chambers are pointed up. The expansion chamber is a small white/clear plastic bulb-like thing That is attached to one side of each of the CRT's up near the top lens. In some TVs, the expansion chambers are already pointed up - In this case you don't have to tip the TV
2. Cover the circuit boards below the CRT's with several paper towels to prevent accidentally spilling any coolant onto the boards. The coolant is corrosive and will destroy the circuit boards. Don't skimp on the paper towels here - they are cheap!!! 3. Remove the four screws that hold on the focusing lens assembly and remove the focusing lens assembly.
4. Note the position of the expansion chamber then remove the expansion chamber. It will need to be reinstalled in basically the same position so remember the position or take a picture if you need to. There is a small o-ring on the neck of the expansion chamber where it threads onto the CRT housing - Don't loose it!
5. Use the baster and tube to **** the fluid out from the hole where the expansion chamber was removed. This hole is fairly small...maybe 5/16" or so.
6. Once most of the fluid is out, remove the four screws that hold on the lens cover plate.
7. Remove the lens cover plate, the lens & the large o-ring. (be gentle with the o-rings!!!)
8. Clean the CRT chamber & lens with denatured alcohol. Use 100% cotton balls so you don't scratch anything.
9. Clean the CRT chamber and lens with distilled water. Again, use 100% cotton balls so you don't scratch anything. This will rinse out the alcohol residue. You need to use distilled water for this so there is no mineral residue.
10. Gently clean the large o-ring with distilled water (don't use the alcohol because it might eat the o-ring) Dry off the o-ring and lightly coat it with 100% pure silicone (not siliconized acrylic caulking or acrylic latex caulking - ONLY USE 100% SILICONE). Use your fingers to rub a thin layer of silicone all over the surface of the o-ring. Then place the o-ring in the groove in the CRT housing.
11. Place the lens in its position on the o-ring.
12. Place the lens cover plate over the lens and install the four screws.
13. Clean your baster and tubing with denatured alcohol then rinse with distilled water.
14. Use the baster and tube to **** clean fluid from the bottle and install it into the CRT through the expansion chamber hole. Go really slow when it is almost full to minimize overflow. Wipe up any overflow immediately. There will be a small air pocket in the CRT when you are done - you will not be able to fill the chamber 100% - This is O.K. Just be sure to fill it as far as possible so the fluid is just up to the edge of the expansion chamber hole.
15. Install the expansion chamber. Be sure to install it in the same position as it was before you removed it. Also be sure that the small o-ring is on the neck of the chamber before you thread it on. The chamber is just plastic so don't over-tighten it or you might damage it. Screw it on as tight as you can go by hand and then give it about 1/8 of a turn with pliers. (you might have to use needle-nose pliers to get a good grip on it.)
16. Place the focusing lens assembly into position and install the four screws.
17. Turn on the TV and check for leaks over the next 20 minutes. Remember, you have not yet removed all the paper towels from inside the TV. Remove these once you know there are no leaks.

Other things that should be done after replacing the fluid include...
1. Clean the mirror
2. Clean the top lenses of the focusing assemblies
3. Focus the CRT's 4. Adjust the convergence Here is a list of things you will need: 1. Turkey baster 2. Vinyl tube 3. Cooling Fluid
4. 100% cotton balls
5. Paper towels
6. Denatured alcohol
7. Distilled water
8. Pliers
9. Screw driver Ordering Coolant: http://www.mcminone.com Part # 20-2041 ( I would suggest ordering two bottles.)

Try that and let me know how it goes. If this solution was helpful, kindly take a moment to "Accept" it. Thanks!

Posted on Jun 15, 2008

  • Swilin Sampson
    Swilin Sampson Jun 15, 2008

    Oh,they changed the part number on the coolant, its new
    number is 20-4275. Also before you order and change the fluid, look in
    to all three CRTs and make sure you do not see any burn mark or spot on
    the surface of the CRT screen. If there is and it does not look like a
    contaminant, you will have the same problem when you change the fluid.
    So please make sure first. By the way, if you want this job to go
    well and dont want to tip the set, use the pump they have to do this
    job.

    After doing this, if the picture appears blurry, try this:
    There is a focus block that has the three (RGB controls on it along
    with the three different screen controls. Look closely at the three
    focus controls. Look at each one and while adjusting the said color,
    look into the same color picture tube and "rock" the focus control back and forth while looking inside the front of the lens to tweak the
    focus for each color.

  • Swilin Sampson
    Swilin Sampson Jun 15, 2008

    If you have an LCD TV, then the issue is with the optical engine, and I wouldn't recommend playing around with that. You will need a qualified TV repairman to fix it.

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  • Master
  • 790 Answers

Hello 4caster!!,

Had seen a solution given by one of my mate in fixya he says

"Easy fix. I had the same green dot problem and I removed the front panel (no screws). In the center is a panel that has two screws. Remove them and pull the cover off. There you will find the projection bulb. Do not clean the bulb but instead the base. Use a damp cloth to wipe the dust off the black disk (the base of the projection bulb housing). Apparently the dust through static electricity may cause enough magnetism to distort your picture. Hope this helps.
JK"

Regards
Smilemaker

Posted on Jun 15, 2008

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  • Expert
  • 243 Answers

You need a degaussing tool. it was most likely magnetized. make sure you move away magnetic things as well as unshielded devices such as unshielded speakers and other powered devices. this is what will cause the problem.

Posted on Jun 15, 2008

  • 2 more comments 
  • Nathan Ayers
    Nathan Ayers Jun 15, 2008

    Sorry I misread and was thinking a tube tv.


  • Nathan Ayers
    Nathan Ayers Jun 15, 2008

    For a projection TV. Check in your options and see if you have a way to align the color guns. If you give me the Make/Model of your tv I could probably tell you specifically what it is called. You can also have a proffesional come out and align your color guns which is most likely the problem. This usually runs about 125$ around where I live. Check your TV's menu for some sort of option and let me know how it goes.
    Thanks,
    Nathan


  • Nathan Ayers
    Nathan Ayers Jun 15, 2008

    They also will professionally clean all the components inside as I do not recommend doing that yourself as you can cause serious injury unless It has a user serviceable bulb.
    Let me know how it goes,
    Nathan


  • Nathan Ayers
    Nathan Ayers Jun 16, 2008

    irish stick to logitechs and ibm's.

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