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Plasma TV Flex PCB application

Plasma TV Flex PCB application
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Plasma TV Flex PCB application

  • Plasma TV Flex PCB application
    Uses more electrical power, on average, than an LCD TV using a LED backlight. Older CCFL backlights for LCD panels used quite a bit more power, and older plasma TVs used quite a bit more power than recent models.
    Does not work as well at high altitudes above 6,500 feet (2,000 meters) due to pressure differential between the gasses inside the screen and the air pressure at altitude. It may cause a buzzing noise. Manufacturers rate their screens to indicate the altitude parameters.
    For those who wish to listen to AM radio, or are amateur radio operators (hams) or shortwave listeners (SWL), the radio frequency interference (RFI) from these devices can be irritating or disabling.

    Plasma TV Overview
    Plasma television technology is based loosely on the fluorescent light bulb. The display itself consists of cells. Within each cell two glass panels are separated by a narrow gap in that includes an insulating layer, address electrode, and display electrode, in which neon-xenon gas is injected and sealed in plasma form during the manufacturing process.

    When a Plasma TV is in use, the gas is electrically charged at specific intervals. The charged gas then strikes red, green, and blue phosphors, thus creating an image on the Plasma TV screen. Each group of red, green, and blue phosphors is called a pixel (picture element - the individual red, green, and blue phosphors are referred to as sub-pixels).

    Due to the way that Plasma technology works, it can be made very thin. However, even though need for the bulky picture tube and electron beam scanning of those older CRT TV is no longer required, Plasma TVs still employ the burning of phosphors to generate an image.

    Thus, Plasma TVs still suffer from some of the drawbacks of traditional CRT TVs, such as heat generation and possible screen-burn of static images.

    You would have to scrape the plastic outer layer away then hold down the two halves so they are butted against each other and completely flat. Using a tiny pin, glob the epoxy on the adjacent copper traces until you've joined them all. Then, after that has dried, place a layer of normal epoxy over the whole thing it give it strength. Keep in mind, you can't flex this at all.
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    Frequent Contributor
    DISADVANTAGES of LCD vs Plasma televisions include:
    Lower real contrast ratio, not as good rendering deep blacks, although the increasing incorporation of LED backlighting has narrowed this gap.
    Not as good at tracking motion (fast moving objects may exhibit lag artifacts) - However, this is improving with the recent implementation of 120Hz screen refresh rates and 240Hz processing in most LCD sets, but that can result in the "Soap Opera Effect", in which film-based content sources look more like videotape that film.
    Narrower effective side-to-side viewing angle than Plasma. On LCD TVs, it is common to notice color fading or color shifting as you move your viewing position further to either side of the center point.
    Although LCD TVs do not suffer from burn-in susceptibility, it is possible that individual pixels on LCD televisions can burn out, causing small, visible, black or white dots to appear on the screen. Individual pixels cannot be repaired, the whole screen would need to be replaced at that point if the individual pixel burnout becomes annoying to you.
    LCD TV is typically more expensive than equivalent-sized (and equivalent featured) Plasma TV, although that is no longer a factor, now that Plasma TVs have been discontinued.
    The 4K Factor
    One additional thing to point out with regards to the difference between LCD and Plasma TVs, is that when 4K Ultra HD TVs were introduced, TV manufacturers made the choice to only make 4K resolution available on LCD TVs, using LED back and edge-lighting, and, in the case of LG, also incorporating 4K into TVs using OLED technology.

    Although it is technologically possible to manufacture and incorporate 4K resolution display capability into a Plasma TV, it is more expensive to do so than on an LCD TV platform, and, with the sales of Plasma TVs continuing to decline over the years, Plasma TV made a business decision not to bring consumer-based 4K Ultra HD Plasma TVs to market. The only 4K Ultra HD Plasma TVs that were/are manufactured are strictly for commercial application use.
    Posts: 346
    At the 2010 Consumer Electronics Show in Las Vegas, Panasonic introduced their 152" 2160p 3D plasma. In 2010 Panasonic shipped 19.1 million plasma TV panels.[59]

    Plasma and LCD TVs look very similar but, as we've just seen, work in totally different ways. Plasma TVs tend to cost an awful lot more, so why not just buy an LCD? The main difference is that the cells that make up the pixels in a plasma TV can switch on and off thousands of times faster than the pixels in an LCD screen, so you get clearer pictures with less blur, especially for moving images during action movies or sports games. (The latest LCD screens switch on and off more quickly than older ones, but it's generally true that plasma screens are faster.) Plasma TVs are also typically brighter and have higher contrast, which can be important if you watch a lot of TV in the daylight. You can view plasma screens from a wider angle without seeing distortion of colors (like you get on an LCD computer screen), so they're often better for larger audiences (projection TV is another option for showing pictures to a roomful of people).

    But there are drawbacks with plasma too. They're more power hungry than LCDs and the screens are heavier and more fragile, so you have to be very careful when you transport them. Plasma TVs also have problems with "burn in" (where images that are displayed for too long can permanently damage the screen) and they tend to "burn out" (stop working through too much use) more quickly than LCDs, though most people are likely to replace a TV for something newer before this happens.

    Generally speaking, plasma TVs are much cheaper than they used to be, while LCD TVs are much faster than they used to be, and the two technologies are now very broadly comparable for ordinary household viewing—just pick whichever you like best!

    In 2010, the shipments of plasma TVs reached 18.2 million units globally.[60] Since that time, shipments of plasma TVs have declined substantially. This decline has been attributed to the competition from liquid crystal (LCD) televisions, whose prices have fallen more rapidly than those of the plasma TVs.[61] In late 2013, Panasonic announced that they would stop producing plasma TVs from March 2014 onwards.[62] In 2014, LG and Samsung discontinued plasma TV production as well,[63][64] effectively killing the technology, probably because of lowering demand.

    Inverter Transformer
    Application : PS for LC Cold Cathode Tube Displays, etc.
    Output Voltage : 2800V(10W) MAX.
    Drive Circuit : Inverter Circuit for lighting Backlight.
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    Although it is technologically possible to manufacture and incorporate 4K resolution display capability into a Plasma TV, it is more expensive to do so than on an LCD TV platform, and, with the sales of Plasma TVs continuing to decline over the years, Plasma TV made a business decision not to bring consumer-based 4K Ultra HD Plasma TVs to market. The only 4K Ultra HD Plasma TVs that were/are manufactured are strictly for commercial application use.

    Switching Transformer
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    Application : Power supply of lamps for Liquid Crystal Projector, a boiler, a GAS-range, etc.
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    Smaller press-fit (or "pop") connectors may require a simple flick with a plastic opening tool, spudger, or fingernail.

    If you've read our articles on energy-saving fluorescent lamps (also known as CFLs) and neon lamps (the lamps that make brightly colored displays in our streets), you'll know how they make light by buzzing electricity through a gas. Imagine if you built a TV screen out of millions of microscopically tiny CFLs or neon lamps, each of which could be switched on or off very quickly, as necessary, by an electronic circuit, to control all the separate pixels (lit-up, colored squares) on the screen. That's pretty much how a plasma TV works and it's very different to other kinds of television technology: in a conventional (cathode-ray) television, the picture is built up by scanning an electron beam back and forth over a screen treated with chemicals called phosphors; in an LCD TV (liquid-crystal display television), polarizing crystals make light rays bend to switch the pixels on and off.

    The pixel cells in a plasma TV have things in common with both neon lamps and CFLs. Like a neon lamp, each cell is filled with tiny amounts of neon or xenon gas. Like a CFL, each cell is coated inside with phosphor chemicals. In a CFL, the phosphor is the chalky white coating on the inside of the glass tube and it works like a filter. When electricity flows into the tube, gas atoms crash about inside it and generate invisible ultraviolet light. The white phosphor coating turns this invisible light into visible white light. In a plasma TV, the cells are a bit like tiny CFLs only coated with phosphors that are red, blue, or green. Their job is to take the invisible ultraviolet light produced by the neon or xenon gas in the cell and turn it into red, blue, or green light we can actually see.
    About a million tiny screws later, I had the back of the Maxent TV off, and could see the four main boards inside. A power board, a processor board, and the Y and Z sustain boards. Nothing looked out of place. No connections were unplugged, and there wasn't a dead mouse trapped inside shorting anything out (hey, you never know). The fuses on the board were the opaque ceramic kind, so I couldn't tell if any had blown by visually examining them. The smart thing to do here would have been to get a multimeter and check the fuses, but I wasn't intellectually invested enough in the project to do that yet.

    Опубликовано: 3 года назад
    42" Philips Plasma TV, model PFP5332/10.

    I got this TV for cheap since it was sold as defective. It was claimed by the seller to be clicking when trying to turn it on, which it indeed was. This was easily solved by just replacing a capacitor in the power supply. However, once I got it to power up, I noticed that there were colored vertical lines going across the whole screen to the left.
    In this video, I start out doing some basic troubleshooting in an attempt at tracking down the problem.

    Depending on the input signal, your Samsung Plasma TV will either up-convert or down-convert the signal. For example, if your Plasma TV displays at 720p, then it will up-convert a 480i or 480p signal to 720p and down-convert a 1080i or 1080p signal to 720p.

    Note: Your Samsung Plasma TV will let you change the size of the picture (from 16:9 to 4:3, for example, for standard cable broadcasts), but the signal format (the displayed resolution, for example, 720p) will remain unchanged. The TV will compensate for the smaller, non-HD size by adding bars to the sides or top and bottom of the screen.

    Older Plasma TVs
    All older Samsung Plasma TVs accept 1080i signals through at least one Component Video input. However, none display in 1080i, but instead, in 720p, 480p, or 480i, depending on the TV.

    When I disconnect the two flat flex cables going to the two address buffer boards, I get a white noisy picture on screen. This is not strange considering the logic board is disconnected from the address buffers, however, I still get those vertical lines going across the screen at exactly the same place as before. The only difference is that the lines are now more blackish than when the logic board is connected to the address buffer boards.
    This most probably means that there is nothing wrong with the logic board in terms of signals going out to the address buffer boards.
    I am more and more starting to conclude that there is something wrong with the address buffer board that is handling the left part of the screen, seen from the front of the TV. Either that, or maybe even more likely, there is something wrong with the X-address driver IC that is mounted on the plastic ribbon carrier (the flat flex cable) that is going between the X-address board and the plasma panel. There is a COF (Chip On Film) on this ribbon carrier going between the X-address board and the plasma panel display. This COF is the X-address driver IC. It might have failed, or there might be some other kind of fault with the flat flex cable itself. I have yet to investigate this.

    This is Part 1. A part 2 is coming as soon as I have any updates on this repair.

    I dug around online looking for people who had had problems with the same model. There were a lot of questions being asked online, but not a lot of answers. In many cases, people with similar problems reported that one of the four boards, the Y-sustain (or Y-SUS) board, was usually to blame. I also discovered that my specific Maxent was internally identical to sets from LG, Vizio, Toshiba, Zenith, and others, which I thought might make finding replacement parts easier.

    One useful link I found was a blog entry from someone who had stumbled across the same model TV, a Maxent MX-42HPM20, sitting by a Dumpster. Being more electronically savvy than I am, he described how he tested the fuses on the Y-SUS board, and eventually got the set working by replacing first, a blown fuse and capacitor, then eventually the entire Y-SUS board. This was especially useful information for two reasons. First, someone had successfully repaired the same model plasma with what sounded like the same problem; and second, the blog post included specific part numbers for a compatible Y-SUS board I could use to search on eBay (those being EBR31872801 and 6871QYH053B).

    Armed with that information, I decided to simply order a replacement board and try swapping it in. It seemed to be the part that failed most often in this family of TVs, so if it worked, great. If not, I hadn't invested too much time, money, or energy in the project. There was a handful of parts available on eBay, mostly from established electronics parts vendors with good feedback records. Prices ranged from around $100 to $160, and the stock fluctuated every few days, so when I was ready to buy, I got one for around $130.

    Place the flat edge of your tool under the edge of the connector, and pry the connector straight up from its socket.

    Be very careful to pry only under the flat edge of the connector, and not under the socket itself. If you pry under the socket, you will separate it from the logic board, causing permanent damage.

    To reconnect, align the connector carefully over its socket and press down with your fingertip—first at one side, then the other—until it clicks into place.

    Do not press down on the middle until the connector is fully seated—if it's misaligned, the connector can bend, causing permanent damage.

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