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Need to replace the glycol oil (coolant) in our rear projection tv

We have a 60" Phillips Magnovox television that needs to have the fluid refilled in the blue tube. Where can you purchase the glycol oil to do it yourself

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  • tylerevan Jan 12, 2008

    Need to purchase glycol oil (coolant) to refill television tubes

  • tylerevan Jan 12, 2008

    Thanks for the quick response. We would love to have instructions on how to do the procedure. Thanks

  • tylerevan Jan 12, 2008

    Thanks so much. We will let you know how it goes once we are able to order the coolant. Do you have any idea how much this coolant costs?

    One more question. Do you have to refill all the colors or just the one that looks like oatmeal?

  • typhou Jul 14, 2008

    where can i order glycol oil for my projection tv tube?

  • Anonymous May 19, 2009

    need to replace the glycol in my magnavox

  • sanders20558 May 11, 2010

    How many bottles do i need if i want to replace the coolant in all 3 crt's on my Philips 50p8341a???and how can i focus the crt's, adjust the convergence and get the best image of my TV set??? this will be my first time. and i want to get the job well done THANKS...



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You can get The Picture Tube Coolant at the link here Matt electronis. they offer quick shipping, And if you need instructions on how to do the proceedure , please let me know

Posted on Jan 12, 2008

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  • Sonny Berry
    Sonny Berry Jan 12, 2008

    I will have to post the instructions in two seperate post as its too long. Hope it helps.
    Changing Projection TV Coolant

    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 suck 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.

  • Sonny Berry
    Sonny Berry Jan 12, 2008

    And the second part is;

    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 CRThousing.

    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 suck clean fluid from the bottle and install it into the CRT through the expansion chamber hole. Goreally slow when it is almost full to minimize overflow. Wipe up any overflow immediately. There will be a small air pocket inthe 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.

  • Sonny Berry
    Sonny Berry Jan 12, 2008

    Usually Blue and green are the ones that gel up. Red seems to last alot longer. I would do just the effected ones. Hope this helps.


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You'll probably want to short the anode before messing around those crts...32.2kv unless of course you don't mind getting electricuted.

Posted on Jul 13, 2010

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Here is a step by step on how to change the tv coolant.
I found a some help at the following web site forum

I ordered the coolant from
Projection TV Coolant - Techspray - 1915-16SQ

Posted on Feb 03, 2009

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What about the folks in Canada, Will they ship to me
I have a 60" magnavox i want to change coolant and clean out the gunk,

add me on msn if you wouldn't mind me msg'n you for advice.

Posted on Oct 01, 2008

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see here:

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Convergence bowed


the coming out is glycol oil (coolant). If still under warranty or if you have no electronic repair experience you should take the set back to the shop or to a repair person. Some of the solutions described below can be dangerous, TV's are very hazardous to service. Even when plugged out, TV's can store very high voltages.

Looks like a picture tube problem.
Try to reduce the contrast, maybe it will be better.

Look into the three tubes while the TV is running, and observe the
picture quality of the three. If the red and green are crisper and clearer, and the blue's all hazy from bacteria growing in the coolant, then the fluid needs to be replaced. The CRTs of the colors that seem hazy need to be removed from the light box to be
serviced. The coolant needs to be drained, the CRT assemblies
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clear, it can be a weak CRT.

Also the convergence STK ships might need to be replaced, and the soldering checked.

Good luck

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