Quantities of the quality of glass needed for picture tubes are limited, and the emergence of large-screen sets has created a shortage in this portion of the industry. The large screens are also very heavy, so flat-panel displays using plasma-addressed liquid crystal PALC displays were developed in the s.
This gas plasma technology uses electrodes to excite layers of neon or magnesium oxide, so they release ultraviolet radiation that activates the phosphor on the back of the television screen. Because the gas is trapped in a thin layer, the screen can also be thin and lightweight. A shadow mask with , holes lies immediately behind the phosphor screen; the holes are precisely machined to align the colors emitted by three electron beams.
Today's best picture tubes have shadow masks that are manufactured from a nickel-iron alloy called Invar; lesser quality sets have masks of iron.
The alloy allows the tube to operate at a higher temperature without distorting the picture, and higher temperatures allow brighter pictures. Rare-earth elements have also been added to the phosphor coating inside the tube to improve brightness. The electrons are fired by three tubular, metal electron guns that are carefully seated in the neck, or narrow end, of the tube.
After the electron guns are placed inside the tube, the picture tube is evacuated to a near vacuum so air does not interfere with the movement of the electrons. The small opening at the rear of the tube is sealed with a fitted electrical plug that will be positioned near the back of the set. A deflection yoke, consisting of several electromagnetic coils, is fitted around the outside of the neck of the picture tube. The coils cause pulses of high voltage to direct the scanning electron beams in the proper direction and speed.
The electrons are fired by three tubular, metal electron guns seated in the neck, or narrow end, of the picture tube. A color selection filter with , holes lies immediately behind the television screen; the holes are precisely machined to align the colors emitted by three electron beams. As with all precision devices, quality control for the manufacture of the television is a rigid process. Inspections, laboratory testing, and field testing are performed during the development of prototypes and throughout manufacture so the resulting television is not only technologically sound but safe for use in homes and businesses.
There are no byproducts from the manufacture of the television, although many other devices are a part of the television "family" and are often produced by the same manufacturer.
These include the remote control, computer monitors, video recorders VCRs , laser disc players, and a host of devices that may require compatible design and components. Specialized televisions are produced for some industries, including television studios and mobile broadcast facilities, hospitals, and for surveillance applications for public safety and use in inaccessible or dangerous locations.
Wastes may include metals, plastics, glass, and chemicals. Metals, plastics, and glass are isolated and recycled unless they have been specially treated or coated. Chemicals are carefully monitored and controlled; often, they can be purified and recycled, so disposal of hazardous wastes can be minimized. Hazardous waste plans are in effect in all stages of manufacture, both to minimize quantities of waste and to protect workers.
The future of television is now. This system produces a movie-quality picture by using a 1,line picture on a "letter-box" format screen with a 16 to nine width to height ratio. High-quality, flat screens suitable for HDTV are being perfected using synthetic diamond film to emit electrons in the first application of synthetic diamonds in electronic components.
Other developments in the receiver include gold-plated jacks, an internal polarity switch on large screens that compensates for the effect of Earth's magnetic field on image reception, accessories to eliminate ghosts on the screen, the Invar shadow mask to improve brightness, and audio amplifiers. Liquid crystal display LCD technology is also advancing rapidly as an alternative to the cumbersome television screen.
Assorted computer chips add functions like channel labeling, time and data displays, swap and freeze motions, parental channel control, touch screens, and a range of channel-surfing options. Digital television of the future will allow the viewer to manipulate the angle of the camera, communicate with the sports commentator, and splice and edit movies on screen. Two-way TV will also be possible. Current screens may be used thanks to converter boxes that change the analog signal that presently energizes the phosphors on the back of your television screen to digital signals that are subject to less distortion—and are the language of computers.
Computer technology will then allow a world of manipulation of the data as well as broadcast of six times as much data. The future of television manufacture may be anywhere but in the United States. Thirty percent of all televisions manufactured by Japanese companies are made in factories in Mexico. The factories themselves will soon be producing hybrids in which the television, computer monitor, and telephone are a single unit, although this development will take further improvements in compatibility between machines that speak analog versus digital language and the creation of PC-to-video bridges.
Proof of the possibility of this integrated future exists now in Internet access that is now available through television cable converters and the living room TV screen. Barker, Dennis P. Braithwaite, Lancelot. Doherty, Brian. Fisher, David E. The charge stored in the CRT can last a very long time, usually a few months, sometimes for a few years So it is important to safely discharge the CRT before you do anything else - otherwise you might end up in the grave To discharge the CRT: Connect one alligator connector clip to a flat-head screwdriver, and the other clip to another any screwdriver.
Push one screwdriver into the earth ground and take the other flat-head screwdriver and gently put the end under the suction-like cap. Keep pushing it in until you here a loud or faint "SNAP", the CRT is discharged, but push in the screw driver until you feel a little bump, the screwdriver had touched the metal clips Now the CRT is completely discharged.
Now, simply cut the HV wire off near the suction-like cap. I took the suction-like cap off completely because I know how to do it.
Taking the suction-like cap off the CRT can be tricky and dangerous. So we can take the electronics out. One last thing to do Put the back cover back on the TV or monitor to make it safe from an implosion. And can you do me a favor? Please take the CRT to a recycle facility. Please don't dump the CRT to the landfill. Because of this, the phosphor and other chemicals that make the CRT screen glow is extremely toxic and it is very harmful for the environment, so can you take it to a recycle facility?
And you are done! There are the instructions on how to take apart a TV or monitor! The main reason why I wanted to take apart a TV or monitor is I am after one part: The flyback transformer. You can make many great high voltage projects with the flybacks. Make your own Lightning Globe! And most of the other parts inside the TV or a monitor can be quite useful too. Before you throw out all your unwanted TV parts, be sure to check out this instructable on how to get tons of enameled wire!
How to get tons of free enameled copper wire I hope you found this instructable useful! If you have any questions, or need help, or found an error, or anything, make a comment! Question 6 months ago. Do these packs look like the items that contain the poison part of television sets? I collect scrap wire to peel and recycle the copper. I found this on the street but don't know what it came off of.
Lots of nice looking wire to peel but I scare myself it may be from a television and don't want to mess with it if it will leak something when I cut the wires loose. I looked around and couldn't find a specific picture of the dangerous item on televisions. Thank you for your time! Question 1 year ago on Step 3. My new thriftstore TV looks burned inside, a few elektrics explode. I don't have a suction cap like you do, there is a hole.
I already cut the wires of because there was no voltage. Can I remove it safely now? I am not sure it's save. I have an old digital CRT set that hasn't worked for years. It's extremely big , bulky and heavy the two delivery guys who brought it in looked near to collapse after carrying it six feet All Posts.
For Drywall TV Mounting The majority of people install their televisions on standard drywall, so the TV mounting tools they need are pretty unremarkable.
Stud finder. This will help you identify where the wood studs are for more secure mounting. Power drill and bits. A variable speed drill will keep you from stripping the screws. Socket wrench and various sockets. The mount connects to the TV with bolts. Standard and Phillips head screwdrivers Tape measure Safety goggles. You'll also need a wall mount kit that will fit your television's proper configuration, as well as these other items: Drywall screws Pencil and paper Snap toggles, in the event there are no studs where you need them.
Extra hardware and bolts, in case you're missing something from the mounting kit. Hammer drill. You'll need some extra power to get through the brick wall. For Hiding Cables Once your television is mounted to the wall, you'll want to complete the job by hiding that unsightly pile of wires and cables. Sound Too Complex? Debbie D. Debbie Dey is a professional writer with over three decades of experience in residential construction.
Her background gives her a wealth of knowledge about all kinds of home improvement projects, which she enjoys sharing through her writing. She has been a Puls staff writer since In her free time, you can find her relaxing by the water or cruising with her husband in their sports car.
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