k4eez
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Jul 4, 2007, 1:42 AM
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Re: [mpj220] Changing CRT Coolant
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Hello Group,
This is my first time post here, I am a amateur radio operator, not done much H.V (high voltage) stuff all of our radio equipment runs of 115Ac steeped down to 12v 50 Amps DC and some RF tube amp’s are 110-240 Vac with anode voltage 1300> but don’t play about with much of the tube stuff, mainly all Ic’s and transistors (DC) just giving you an idea of my electroncis background...
Anyhow, I have a Magnavox 56 inch, model# FP5240 W101 other numbers are 347H, it was built in 1995.
Well, I never owned a rear screen projection before, and my Co- worker gave me this TV as he just bought a brand-new HDTV and he asked me if I would like it for free of course… well guess what, here it is, it works just fine, however, the screen has a green/blue/yellow blurry effect, and the picture is kinda dull, well, as I only found this post website as of today, I decided to take the back off the tv, and the first thing I did, was remove the black back board, then I had access to the main components of the tv. I found a lot of dust build up on the len’sssss all of them, so I dusted them all off, I then turned the tv on and re focus each CRT, using the focus pots on the multi-ht voltage doubler, anyhow, I re-focused each CRT with use of an old cd cover over the top of each lens (2 covered up at a time), and so had one gun/crt showing at any one time, and once I did one, I covered the next one and moved on R. G. I got to the Blue Crt gun and it won’t focus at all, its either blurry or blurerey, anyhow i did what i could, all the crt's are nice a bright now after a picture tweak tune up, so now insted of a dull screen. I have got a screen on the tv that has a fog or green/blue/yellow mist around the picture but the picture is crisp just color issues. The tv also has S-video input, I hooked up my laptop to it and found a few very good test Pattens,,, I will try and upload it here later , anyhow, the picture would not show white at all it was slight pink, green or red/blue or off white…gerrrrrr
I want to take the plunge and go for the coolant flush and refill and like to take out each
Crt one by one, but there are 3 things that concern me:
1, What is the correct procedure to discharge HV and Static from the flyback cable or where the cup is on each CRT?
2, Once I have drained the old coolant, and if found any micro bugs/ bacteria how do I clean it off the inside of the lens where the coolant lives?
3, What to do with the old coolant?
Coolant info:
Glycerol is a chemical compound with the formula HOCH2CH(OH)CH2OH. This colorless, odorless, viscous liquid is widely used in pharmaceutical formulations. Also commonly called glycerin or glycerine, it is a sugar alcohol and fittingly is sweet-tasting and of low toxicity. Glycerol has three hydrophilic alcoholic hydroxyl groups that are responsible for its solubility in water and its hygroscopic nature. Its surface tension is 64.00 mN/m at 20 °C and it has a temperature coefficient of -0.0598 mN/(m K). It is a central component of lipids.
Since glycerol forms the backbone of triglycerides, it is produced on saponification or transesterification. Soap making and biodiesel production are examples of the former and latter. Until recently, synthetic glycerol was mainly manufactured at an industrial scale from epichlorohydrin though this process is no longer economical. Glycerol is a 10% by-product of biodiesel manufacture (via the transesterification of vegetable oils). This has led to a glut of crude glycerol on the market. Although this crude glycerol (typically containing 20% water and residual esterification catalyst) can be refined to a purified form, a great deal of research is being conducted to try to make value-added molecules from glycerol, as an alternative to incineration. One such programme to add value to this glut of glycerol is the UK-based initiative The Glycerol Challenge. Some potential uses for glycerol include the following: - Hydrogen gas production
- Glycerine acetate (potential fuel additive)[1]
- Compost additive
- Citric acid production
Other applications - Manufacture of paper as a plasticizer, Nitroglycerin, humectant and lubricant. Nitroglycerin is an essential ingredient of smokeless gunpower and various munitions. Reliance on soap making to supply co-product glycerine made it difficult to increase production to meet wartime demand. Hence, synthetic glycerin processes were national defense priorities in the days leading up to World War II.
- Used in lubricating, sizing and softening of yarn and fabric
- Used in de-/anti-icing fluids, as in vitrification of blood cells for storage in liquid nitrogen
- Patent applications have been filed for detergent softeners and surfactants based on glycerol (i.e., alkyl glyceryl ethers) instead of quaternary ammonium compounds.
- A way to preserve leaves is to submerge them in a solution of glycerol and water.
Use a mixture of one part glycerol to two parts water. Place the mixture in a flat pan, and totally submerge the leaves in a single layer in the liquid. You'll have to weigh them down to keep them submerged. In two to six days, they should have absorbed the liquid and be soft and pliable. Remove them from the pan and wipe off all the liquid with a soft cloth. Done correctly, the leaves will remain soft and pliable indefinitely. - Often used in the preparation of lichen for use in model scenery and dioramas
- Can be added to solutions of water and soap to increase that solution's ability to generate soap bubbles that will last a long time.
- Used as an antifreeze or a cryoprotectant in cryogenic process.
- Used in fog machine fluids
- Used in hookah tobacco mixtures (called "ma'assel" or "shisha" tobacco), often along with molasses and/or honey.
- Counteracts phenol burns
- Now that biodiesel production likely will produce large quantities of co-product glycerine (about 0.1 lb of glycerine per lb of biodiesel), processes are being announced to manufacture propylene glycol and epichlorohydrin, traditionally propylene derivatives, from glycerine.
- A process has been announced to produce ethanol through the metabolic action of E. coli[8].
- Used by some endurance athletes to counteract dehydration by "glycerol loading" before an event.
- Used to preserve bacteria at -80 (prevents lysing of cells).
- Used to increase the density of samples in gel electrophoresis, making them settle in the wells more efficiently.
- Used in PCR as an additive. It decreases the dielectric constant of the mixture, which will weaken hydrogen bonds in the double-stranded DNA and lower the annealing temperature.
- When mixed with potassium permanganate, iron oxide, and aluminum, it produces a thermite reaction.
- Used in the conservation of waterlogged organic objects (such as leather and wood) to stabilise before freeze-drying treatment.
Danger of contamination with diethylene glycol:
On May 4, 2007, the US Food and Drug Administration advised all US makers of medicines to test all batches of glycerine for the toxic diethylene glycol.[9] This follows an occurrence of 100 fatal poisonings in Panama resulting from a Chinese factory deliberately falsifying records in order to export the cheaper diethylene glycol as the more expensive glycerol.[10] Glycerine and diethylene glycol are similar in appearance, smell, and taste. The US Federal Food, Drug, and Cosmetic Act was passed following the 1937 "Elixir Sulfanilamide" incident of poisoning caused by diethylene glycol contamination of medicine.
Any help please
tnx in advance
ps good pdf file, thank you,,,  ,,, Also the jpg test pictures you can google for, Just type in the names of the files (one by one) the click on image, the jpg file i have is 1280 by 800 , I can email if you like just let me know
been waiting for some comments from others...............?
7 3
Trip.
Http://groups.yahoo.com/group/k4eez
(This post was edited by k4eez on Jul 6, 2007, 12:42 AM)
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