What kind of cooling fluid do you use for a TV tube?
Monoethylene glycol is the fluid most commonly used for cooling a projection TV tube. It can be purchased at most electronics stores or online. Glycol is a chemical compound containing two hydroxyl groups.
What is the coolant in a rear projection TV?
Verified Hello,There should be no "coolant" in an older rear projection TV. If you are seeing fluid on circuitry it could be either something spilled in your TV, or possibly a capacitor blew and there is oil on your components. However, in the newer ones there is a fluid the keeps the color guns cool.
What is the fluid in the front of the lens?
I believe it's a mixture of either ethylene glycol or propylene glycol, and glycerin, along with distilled water. It is there to avoid refraction between the CRT tube and the lense, and it also acts as a coolant. Note: The lens fluid is apparently poisonous (and tasty) to pets. Thanks to Erica for pointing this out in the comments below.
What is the liquid inside of the rear view mirror?
I believe it's a mixture of either ethylene glycol or propylene glycol, and glycerin, along with distilled water. It is there to avoid refraction between the CRT tube and the lense, and it also acts as a coolant. Note: The lens fluid is apparently poisonous (and tasty) to pets.
What is the liquid in old projection TVs?
There is no reason to have anti-freeze in a tv unless your living in an igloo. It is like a mineral oil for cooling purposes, it draws the heat away from the componants (lights) that make a lot of heat. Without it, it would burn up.
What is inside a rear projection TV?
A rear projection TV is a type of display technology featuring a CRT, LCD, or digital light processing (DLP) projector inside the chassis which projects an image on to the front-mounted screen. It was popular during the early days of now-traditional LCD TVs, where LCD technology was prohibitively expensive.
Do projection TVs have tubes?
A 53-inch widescreen rear-projection television from Sony Instead, they use a projection screen. There are lots of different types of rear-projection televisions. They include: Cathode ray tube (CRT), which uses three CRTs, one each for red, green and blue.
Do TVs have fluid?
Well, your LCD screen TV uses liquid crystals to create a picture. But, these crystals are actually very viscous and it is hard for them to physically drip. That said, the crystals could potentially leak from the TV if there was a problem with your screen.
What can I do with my old rear-projection TV?
Here are a few things you can do with an old projection TV:Sell it for parts. There are people and businesses who need various parts to use in like devices. ... Donate it. Some charities and other organizations will accept a working projection television. ... Repurpose it. ... Repair it for continued use. ... Junk it.
How long should a projection TV last?
Average Life Spans Projector Central, an online trade magazine for projection equipment, suggests that most projector bulbs have a life of about 2,000 hours. Epson claims its PowerLite projector's lamp lasts 5,000 hours and Delta makes an LED-based projector with a projected life span of about 20,000 hours.
How do you fix a projection TV?
Use a strong magnetic coil and make circular motions around your projection TV screen starting on the upper left corner. Increase the size of the circles you're making until you've covered the entire screen. Slowly move away from the screen; continuing to make circular motions with the magnet.
What is the difference between a projection TV and a regular TV?
Summary: 1. Plasma TV's use plasma gas to light up phosphors and display images, while Projection TV's use beams of light to display images on the screen.
Are projection TVs still made?
KEY TAKEAWAYS: Rear projections systems are no longer in production but still available for purchase used. LCD televisions use CRT backlighting to display an image. They are much thinner and lighter than RPTVs.
What is a liquid crystal TV?
LCD TV is a television display technology based on a liquid crystal display. LCD TVs consume much less power than plasma displays because they work on the principle of blocking light rather than emitting it. An LCD display uses either a passive matrix or an active matrix display grid.
Can a water damaged TV be fixed?
A water-damaged LCD screen is usually not repairable, as water can settle between the layers of the liquid crystal display and can be very difficult to dry.
Can an LCD leak?
Scientists have discovered that LCD screens leak chemicals into just about every environment where they are found, according to a new study, and these particles have the potential to be toxic over time.
What is the difference between a projection TV and a regular TV?
Summary: 1. Plasma TV's use plasma gas to light up phosphors and display images, while Projection TV's use beams of light to display images on the screen.
Do they still make rear projection TVs?
Rear projections systems are no longer in production but still available for purchase used. LCD televisions use CRT backlighting to display an image.
Is a rear projection TV a CRT?
Registered. rear projection crt's use three crt guns (for the primary colors). They are just like the CRT FRONT projector tubes but in a rear projection a mirror/and/or prism is used to bounce the image to a front mounted screen. These tubes are usually seven or nine inches diagonal.
Do rear projection TVs have HDMI?
Examine the back of your rear projection TV to see what input options you have. Most sets manufactured recently will have an HDMI input. If not, look for component cable inputs (these are the green, blue and red-colored cables inputs).
Why do we tear down a TV?
Today we are tearing down a rear projection TV to see what kind of components we can salvage, and to determine whether recycling these appliances yourself is a viable option.
Can CRT tubes retain power?
CRT tubes can retain power after the TV has been unplugged. None of the old TVs and monitors I have dismantled in these articles have retained power, but I always discharge them anyway.
How did the cathode ray tube work?
Cathode ray tube technology was very limited in the early days of television. It relied on conventional glass blowing methods largely unchanged in centuries. Since the tube had to contain a very high vacuum, the glass was under considerable stress, together with the low deflection angle of CRTs of the era, the practical size of CRTs without increasing their depth was limited. The largest practical tube that could be made that was capable of being mounted horizontally in a television cabinet of acceptable depth was around nine inches. Twelve inch tubes could be manufactured, but these were so long that they had to be mounted vertically and viewed via an angled mirror in the top of the cabinet. In 1936, the British government persuaded the British Broadcasting Corporation to launch a public high definition (for the era) television broadcasting service. The principal driver for the British government's move was to establish cathode ray tube production facilities which it believed would be vital if the anticipated World War 2 was to materialise.
How does a CRT projector work?
CRT projector: Small cathode ray tubes create the image in the same manner that a traditional CRT television does, which is by firing a beam of electrons onto a phosphor-coated screen and then the image is projected to a large screen. This is done to overcome the limit of size of cathode ray tube which is about 40 inches. Normally 3 CRTs are used, one red, one green and one blue, aligned so the colors mix correctly on the projected image.
What is a RPTV projector?
Early RPTVs were essentially CRT projectors with a mirror to project onto a built-in screen. They were heavy, weighing up to 500 pounds. The first RPTVs to not use CRTs were launched in 2002, using DLP, LCD and LcOS technologies, requiring a UHP lamp. UHP lamps used in projectors and RPTVs require periodic replacement, as they dim with use. The first wall-mountable RPTV was launched in 2003 by RCA. The first DLP 1080p RPTV was launched in 2005 by Mitsubishi. The first RPTV to use LEDs instead of an UHP lamp as its light source was released by Samsung in 2006. RPTVs that used a plasma lamp were released by Panasonic in 2007. The first RPTV to use lasers instead of an UHP lamp or an LED was released by Mitsubishi as the LaserVue in 2008. Samsung exited the market by 2008, leaving Mitsubishi as the sole remaining manufacturer of RPTVs until it stopped in 2012 due to low profit margins and popularity.
What were the major advances in cathode ray technology in the 1950s?
As the decade of the 1950s unfolded, there were several major advances in cathode ray tube technology. Pre stressing the bulb of the tube with steel bands around the outside of the screen for implosion protection allowed larger tube diameters to be produced. Improvements in correcting for deflection aberrations on those screens allowed larger deflection angles and consequently shorter tubes for a given screen size. Further: much simpler deflection systems had been developed that could generate the large currents required without consuming the power of earlier circuits. By 1956 the ability to produce near rectangular faced tubes was developed. This was facilitated by the pre stressing, but still required the walls to have a convex shape to withstand the atmospheric pressure. Although 17 inches in size was the largest size at this time, it was large enough to render rear projection technology obsolete for the immediate future. Using the superior white phosphor of the post war period and higher accelerating voltages, televisions were larger and brighter.
What are the different types of projection systems?
Three types of projection systems are used in projection TVs. CRT rear-projection TVs were the earliest, and while they were the first to exceed 40", they were also bulky and the picture was unclear at close range. Newer technologies include: DLP (reflective micromirror chip), LCD projectors, Laser TV and LCoS . They are capable of 1080p resolution, and examples include Sony 's SXRD (Silicon X-tal Reflective Display), JVC 's D-ILA (Digital Direct Drive Image Light Amplifier) and MicroDisplay Corporation's Liquid Fidelity.
What companies dropped rear projection TVs?
While popular in the early 2000s as an alternative to more expensive LCD and plasma flat panels despite increased bulk, the falling price and improvements to LCDs led to Sony, Philips, Toshiba and Hitachi dropping rear-projection TVs from their lineup.
How many replacement tubes are needed for a rear projection set?
A rear projection set would require at least one or two replacement tubes during its lifetime.
