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Crt coolant change on a rear projection tv

Color cloudy out of focus

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  • joan62970 Apr 10, 2008

    i have had a tv tech out to look at my philips magnavox projection tv. he said that the blue and green coolant needs to be changed. Is this something that we can do ourselves? He wants $450 to do it. And where can i get the coolant?

  • Susana Sarmiento Feb 02, 2009

    I want to try and change the coolant on my Philips/Magnavox rear projection TV. How much coolant do I need to purchase? Where can I purchase it. About how much does it cost? What tools will I need?


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Here is a detailed step by step guide with pictures
http://www.riddledtv.com/repair/journal/CRTCoolant/

Posted on Sep 12, 2009

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You can do it yourself. You can get the coolant from mcmelectronics.com they are 6.99 apiece and you need three bottles to change all three but the red may not need it. I did all three anyway. After reading many post on this site I found it easier to remove each crt form the tv and do the change in my garage. I couldn't see risking spilling the coolant all over the circuit boards. You can find post on site on how to do it. Couple things though I couldn't find that I found easier. I pulled the drain plug and poured coolant into a coffee can then removed the lens and expansion valve. No need for a turkey baster. Also the drain plug only turns one way. Do not force it or will break off one side and then your going to have to replace it or rig it somehow. I did have to rig one by putting a small screw it the side that broke. It did work like a champ but I wouldn't recommend it. Remove the crt one at a time then put them back. Tag each wire on where it goes . The red wires that on connect to triple bridge/ flyback (going to each crt) looks like there is a disconnect they just need to be pulled straight up fairly hard. There is two rings around the end the show you how far they go back in. They just push back in place. it does looks like you may have pulled the connection off but it does reconnect. They circuit boards push straight down from the tubes and only the grounds should need to be disconnected, The green crt does have a few more connects. I also pulled the screen off, You need a wide blade putty knife to remove the trim then there are just screws. It took about 4 hrs although most of it was just firguring out how to remove everything once I did one crt the others took twenty minutes start to finish.

Posted on Mar 28, 2009

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I find it most productive to remove effective tubes, lights, from the unit. Unplug ground wires, cables,(yoke/conv yoke) & crt socket. Drain fluid, via plug, take chamber apart, clean & disinfect. if this a phillips or mag you will probally only need to do the blue& green tubes. for more detatailed info respond. CAUTION THIS IS NOT WATER; it is: Ethylene Glycol. A coolant like anti freeze in your auto. Remove so wont spill on pc boards. Good luck.

Posted on Apr 02, 2008

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I suggest doing 1 tube at a time so you won't have to do a major re-convergence adjustment. Remove the green crt first. remove the high voltage lead from the splitter, then the yoke and convergence plugs then the ground wires going from the crt ground strap to the crt board.Lay the assembly down with the drain plug facing up( you will have to support the crt neck with a block of wood)I use a turkey baster with a plastic straw taped to the end. Remove the drain plug and suck out the coolant and empty into a plastic container.I use an old milk carton. When most of the coolant is removed remove the lens assembly. Then remove the half moon shaped plastic from the reservoir . suck out the remaining cooland and use a paper towel to sop up the remaining debris. Reinstall the half moon and lens. Fill the reservoir allowing a litle room for expansion.Reinstall the tube then do the customer convergence adjustment. Do the blue tube the same way. good luck

Posted on May 24, 2008

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[url]http://www.tv-forums.com/forum/TV_Equipment_C4/Projection_TV_Forum_F24/How_to_-__crt_coolant_change_and_advanced_convergence_P50090/[/url]


I documented the procedure I did on the link above. For convergence issues try this link:

[url]http://www.tv-forums.com/forum/TV_Equipment_C4/Projection_TV_Forum_F24/Philips_55p916_convergence_issues_P50073/[/url]

Posted on Jun 28, 2009

  • owkosf Jun 28, 2009

    CRT coolant change and advanced convergence - how to



    I documented the procedure I did on a Philips 55" rear projection 55p916


    http://tinyurl.com/lmp6eu CRT coolant change procedure



    http://tinyurl.com/l7bd7r basic and advanced convergence

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My tv tech examined my mitsibishi 65 inch rear projection tv and said it would be cost effective to fix because coolant had leaked onto the pc board is there a way to fix it?

Posted on Feb 24, 2009

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1 Answer

Sreen has perfect color and then fades to a cloudy/faded picture. occassionally picture will go full color then very yellow,very red, cloudy/faded.


Does it come and go? Or is it like this all the time? If you bump the side of the TV does it change the symptoms? Thanks Lou

Aug 27, 2011 | Mitsubishi WS-55613 55" Rear Projection...

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Hitachi ultravision hd tv out of focus, shadows, focus button does not fix


Projection TV sets have two very common problems. One is convergence ( 3D/Warped video) the other is CRT fluid ( Dull Video). Here are more details and solutions for both. Repair kits with instructions are also avail from www.TvRepairKits.com

Common Problem #1) Convergence has gone out

Projection TV sets need to have all three colors - RED - BLUE - GREEN - lined up correctly on the screen in order for the video to look normal. When its out of alignment the video will look 3D, wavy, distorted, etc. Most of the time you just need to adjust your convergence in the TV menu. If you cannot adjust it in the menu - then your convergence is broken and needs to be repaired.

This is a very common failure on these projection sets and a fairly simple DIY fix. All projection sets including Samsung, RCA, Sony, Philip Magnavox, Panasonic, Pioneer, Akai, GE, JVC, Toshiba, and others at some point will have the same problem.

Common Symptoms include....

  • Screen looks 3D
  • Colors don't line up
  • One or more colors can't be adjusted when using the convergence menu.
  • Screen is bowed or warped.
  • TV shuts off after powering on. Power light will blink. TV may also make a chirping noise.
Here are some pics of convergence problems.


7859b01.jpg

e87380c.jpg
69189a5.pngSOLUTION #1

For more more examples and find a fix using this link on Fixya http://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

Common Problem #2) CRT Fluid is Cloudy

Projection TV tubes have a liquid coolant that is used to keep them from overheating. After many years the coolant in the blue and green tubes will become cloudy and cause the screen to look dull, red/orange, etc. You may even see halos around images.

Picture of a set that needs the fluid changed.

578ba6c.jpg
TV set after fluid change

65af323.jpg

69189a5.pngSOLUTION

You can see some more examples and find a fix using this link on Fixya http://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

Jan 24, 2011 | Hitachi UltraVision CineForm 55VG825 55"...

3 Answers

I just auto convergence my zenith tv and it fixed but still 3-D


Ur tv convergence ICS are dead.That why ur colors lines green,red,and blue are not linning up,and the colors look like 3-D pic.Must have soldering tools,and know soldering to fix convergence problems.Must replaced 2 STK convergence ICS and some or all of it resistors.Tries websites like Tv repair World.com,Tvrepairkits.com to buy a convergence kit to repair it ur self.The shop will cost u $300-350 for the parts and labors.

Apr 29, 2010 | Zenith R56W36 56" Rear Projection...

1 Answer

Lost focus.looks 3d. red double. cant focus on red convergence.


This is a very common failure on Projection TV2_bing.gif sets.


  • Screen looks 3D
  • Colors don't line up
  • One or more colors can't be adjusted when using the convergence menu.
  • Screen is bowed or warped.
Here are some photos of convergence problems.1d5e2cf.jpg


ff5b9f6.jpg
7deade1.jpg

Here is a quick test....

Using your original remote go-to the settings menu then goto the convergence section.

Try to adjust the red and then the blue convergence.

You should be able to move RED and BLUE in all directions - up, down, left, and right.

If you can't move them in all directions your convergence chips are bad and should be replaced. This is a common problem.

Note: If you TV has as flash focus or magic focus button only try pressing the button. If it fails to fix the convergence your need to fix it. See below for a solution

47a7bc4.pngSOLUTION

You will need to replace the convergence chips and possibly some convergence resistors and pico fuses.

This is a a fairly easy DIY job if you know what you are doing or you can call in a pro.

If you want to do the repair yourself check the site www.TvRepairKits.com.

Their kits include a step by step instruction guide, original OEM Sanyo STK chips, convergence resistors, pico fuses, thermal paste, email/phone support, etc.

Problem #2 CRT Fluid is Cloudy

Projection tubes have a liquid coolant that is used to keep them from overheating. After many years the coolant in the blue and green tubes will become cloudy and cause the screen to look dull, red/orange, etc. You may even see halos around video.

Pic of a set that needs the fluid changed. Notice how dull the colors are and how white the screen looks. The screen may also look red, orange, dull, etc.

7c190d8.jpg

TV set after fluid change. Notice how bright the colors are now. Everthing looks crisp and sharp again.

a798d23.jpg



724bcba.pngSolution #2


What you will need to do is replace the coolant and clean the crt. You can get a repair kit from www.TvRepairKits.com that includes replacement coolant,step by step instructions, etc.

Jan 28, 2010 | Philips Magnavox 51MP392H Rear Projection...

1 Answer

BLUE TINT ON MY SCREEN


Philips tv's have always had this problem. Between the picture tube and focus lens there is a layer of coolant fluid. The coolant fluid, over time, will break down and turn a brownish cloudy color and it usually starts with the blue. Something to do with the color frequency. Have a good repair shop check it out and if the fluid is the problem have them change all the fluid in all 3 picture tubes (there is a red, green and blue tube). Don't feel bad, like I said all the philips projo's had this problem. Thanks

Oct 29, 2009 | Televison & Video

1 Answer

Auto focus and manual focus(red+will not move left


Your TV most likely has one or more possible problems.

Problem #1: Convergence Chip Failure ( common problem )

Here are some of the most common symptoms and example photos of a convergence problem
  • Screen looks 3D
  • Colors don't line up
  • One or more colors can't be adjusted when using the convergence menu.
  • Screen is bowed or warped.
701cb04.jpg
77ea520.jpg
f0900cb.jpg
Here is a quick test....

Using your original remote go-to the tv settings then goto the convergence section.

Try to adjust the red and then the blue convergence.



You should be able to move them up, down, left, and right.

If you can't move them in all directions your convergence chips are bad and should be replaced. This is a common problem.

2c07611.pngSolution #1

You need to replace the convergence chips and convergence resistors. Check the site www.TvRepairKits.com. They have put together a kits for most models. If you don't see a kit for your set send them a quick note and they will put one together for you. Their kits include a photo instruction guide, original OEM Sanyo STK chips, convergence resistors, pico fuses, etc.


Problem #2 CRT Fluid is Cloudy

Projection TV tubes have a liquid coolant that is used to keep them from overheating. After many years the coolant in the blue and green tubes will become cloudy and cause the screen to look dull, red/orange, etc. You may even see halos around images.

Picture of a set that needs the fluid changed.

578ba6c.jpg
TV set after fluid change

65af323.jpg

2c07611.pngSolution #2


What you will need to do is replace the coolant and clean the crt. You can get a repair kit from www.TvRepairKits.com that includes replacement coolant, photos. instructions, etc.

Apr 17, 2009 | Sony KP-57WS510 57" Rear Projection HDTV

2 Answers

Blue convergence


SINCE YOU HAVE REPLACED THE CIRCUIT BOARD,THE NEXT STEP WOULD BE CHECKING VOLTAGES GOING TO THE CONV. BOARD COMING FROM THE POWER SUPPLY CIR. BOARD.....IF NO VOLTAGE METER,,SOMETIMES, THERE ARE FUSES ON THE POWER SUPPLY CIRCUIT BOARD THAT SUPPLY THE NEEDED VOLTAGES FOR THE NEW BOARD YOU JUST REPALCED...UNPLUG THE SET,,CHECK FOR A BLOWN FUSE----I THINK THERE IS 2 OF THEM--ONE FOR A NEGATIVE VOLTAGE AND ONE FOR A POSTIVE VOLTAGE FOR THE CONVERGENCE BOARD..GOOD LUCK--SORRY, MIGHT NEED A TECH...TUNICA

Oct 30, 2008 | Samsung HCN653W 65" Rear Projection...

1 Answer

Cloudy screen/


More than Likely your Tubes are getting weak!, (3 tubes - Red, Blue, Green) Need Replacing or Rebuilding (fluid change). g.

Jun 26, 2008 | Philips 60PP9202 60" Rear Projection...

1 Answer

Sony KP-61V90 61 in. Rear... Problem


Your TV most likely has one of two possible problems.

Problem #1: Convergence Chip Failure ( common problem )

Here are some of the most common symptoms and example photos of a convergence problem
  • Screen looks 3D
  • Colors don't line up
  • One or more colors can't be adjusted when using the convergence menu.
  • Screen is bowed or warped.
701cb04.jpg
77ea520.jpg
f0900cb.jpg
Here is a quick test....

Using your original remote go-to the tv settings then goto the convergence section.

Try to adjust the red and then the blue convergence.



You should be able to move them up, down, left, and right.

If you can't move them in all directions your convergence chips are bad and should be replaced. This is a common problem.

2c07611.pngSolution #1

You need to replace the convergence chips and convergence resistors. Check the site www.TvRepairKits.com. They have put together a kits for most models. If you don't see a kit for your set send them a quick note and they will put one together for you. Their kits include a photo instruction guide, original OEM Sanyo STK chips, convergence resistors, pico fuses, etc.


Problem #2 CRT Fluid is Cloudy

Projection TV tubes have a liquid coolant that is used to keep them from overheating. After many years the coolant in the blue and green tubes will become cloudy and cause the screen to look dull, red/orange, etc. You may even see halos around images.

Picture of a set that needs the fluid changed.

578ba6c.jpg
TV set after fluid change

65af323.jpg

2c07611.pngSolution #2


What you will need to do is replace the coolant and clean the crt. You can get a repair kit from www.TvRepairKits.com that includes replacement coolant, photos. instructions, etc.

Jun 18, 2008 | Sony KP-61V90 61" Rear Projection...

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