lcd panel failure symptoms supplier

4. #Press the LCD glass side of the panel, if the vertical lines disappear or reappear, it can be judged that the cause of poor contact, OM checking should be able to find the poor contact.

Depending on the backlight structure, there will be different results. The failure of the performance may be a point-off, or it may be a backlight with a dark band.

The above is the full text of LCD screen failure repair guide, we hope it is helpful to you. If you need to buy LCD and find a reliable LCD supplier, we suggest you to read our other great blog – How to find a reliable LCD supplier.

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Liquid crystal displays (LCDs) are the most widely used display technology. Their applications cover TV, mobile phone, appliances, automotive, smart home, industrial meters, consumer electronics, POS, marine, aerospace, military etc. LCD screen display problem can occur for several reasons.

Effect of environmental conditions on the LCD assembly. Environmental conditions include both the effects of temperature and humidity, and cyclic loading.

Effect of manufacturing process. With the development of LCD for more than 40 years and the modern manufacturing equipment, this kind if defects are getting rear.

Common failures seen in LCDs are a decrease in screen contrast, non-functioning pixels or the whole display, and broken glass. Different kinds of LCD display problem need to have different kinds of fix methods or make the decision not worthwhile to repair.

Broken glassIf you accidently drop the LCD and you find it broken on the surface but the display still works. You might just break the touch panel; you can find a repair house or find a youtube video to replace the touch panel. If you find the display not showing, especially you find the fluid leaking out. You need to reply the whole display modules.

Dim LCD displayLCD can’t emit light itself. It uses backlight. Normally, the backlight is not fully driven, you can increase the LED backlight to make a dim LCD display brighter. But if you LCD display has been used for a long time, it is possible that the LED backlight has to be the end of life (not brightness enough) if you turn on 100% backlight brightness. In that case to fix LCD screen, you have to find a way to change the backlight. For some display, it is an easy job but it can be difficult for other displays depending on the manufacturing process.

Image sticking (Ghosting)Sometimes, you will find the previous image still appearing at the background even if you change to another image. It is also called burn in. This kind of failure doesn’t need to repair by professionals. You can simply shut off the display overnight, this kind of problem will go away. Please do remember that displaying a static image for a long time should be avoided.

With the modern manufacturing process and design, this kind of failure rarely happens. Normally, it is caused by no power. Please check if the battery dead or adapter (power supply) failure or even check if you have plug in firmly or with the wrong power supply. 99% the display will be back on.

LCD has white screen – If a LCD has a white screen which means the backlight is good. Simply check your signal input sources which are the most causes. It can also be caused by the display totally damaged by ESD or excess heat, shock which make the LCD controller broken or the connection failure which has to be repaired by professionals.

Blur ImagesAs the LCD images are made of RGB pixels, the screen shouldn’t be blur like old CRT displays. If you do see blur images, they might be caused by two reasons. 1) LCD has certain response time, if you are playing games or watch fast action movies, some old LCD displays can have image delays. 2) The surface of the LCD is made of a layer of plastic film with maximum hardness of 3H. If you clean the surface often or use the wrong detergent or solvent which cause the surface damage. To fix damage on LED screen it’s need to be changed with professionals.

If you have any questions about Orient Display displays and touch panels. Please feel free to contact: Sales Inquiries, Customer Service or Technical Support.

Issues with non-conforming performance, where the product no longer meets the performance specification, may be tied to a lack of quality of the components, LCD manufacturing, or in some rarer circumstance a change on the end-product that affected the LCD display.

Additionally there can be mechanical non-conformities, where there are aspects exceeding the defined tolerance as described in the specification. And in some instances, there may be variations not designated in the specification, but quite different from the original qualification units. These non-conformances are capable of affecting the fit, form, or function of the LCD display when assembled.

If your supplier has excessive component variability or possible process variability, there is the potential for a number of LCD display performance-related issues. These issues can be one-off or related to a larger batch of products manufactured together. Good serialization and traceability will help in isolating these occurrences and get to the root cause quickly.

While out-of-the-box nonconformance is typically the responsibility of the supplier, but it becomes a little more ambiguous when the non-conformance is not covered specifically by the governing specification. In this case, common sense and reasonable expectations of variation, the concept of the TEAM is considered. But at the end of the day, the LCD displays need to work in the finished product, and both parties should take the responsibility together to help get to the most efficient solution.

On the other hand, you need to be aware that performance degradation is sometimes caused by a change in another component upstream of the LCD display. Sometimes, a non-display component that is malfunctioning or is incompatible and interfaces with the display may cause the display to exhibit irregular behavior or render it inoperable altogether.

To verify this, swap displays to a fully functioning assembly and see whether the problem follows the display. If the issue does not reappear, the cause is likely a non-LCD display component.

Unfortunately, it is common for some failures to make it through final testing. After the vibration and thermal effects from the shipping process, these defects can be exposed and result in an out of box failure at the assembly line.

This could be a manufacturing issue during the LCD display production or a quality issue with an upstream component that exposed a failure mode. In this case, fault may lie with the design itself, which indicates the need for a more robust design. Alternatively, a burn-in test process may be needed to expose potential defects prior to final inspection.

The final assembly process could also be a problem area. If the process is complicated, difficult to maneuver, or there are new operators involved there is a much higher probability of damage while assembling the LCD display into the end-product.

Performing a failure analysis is next. Then, linking that analysis to the customer’s field environment. You’ll need to determine (1) whether the failure is caused by the environment and (2) whether a product improvement can better support the application, or whether there’s a way to limit the environmental extremes.

There is also the potential for misusing the product. A good example of this is using the product in an unintended environment such as extreme moisture. Impact is another unmistakable failure mode as it can manifest itself as a broken touch panel or cracked LCD glass.

Unlike older cathode ray tube (CRT) displays that scan an electron beam over a phosphor screen to create light, LCD displays are composed of a fixed grid of tricolor pixels that change transparency based on a range of voltage levels provided by the monitor"s controller. Without a voltage the pixel is opaque and blocks the screen"s backlight from transferring through it, and when a full voltage is applied then the pixel allows full transmittance of the backlight. When this is done over the entire pixel grid in patterns, then you see those patterns on the screen.

This pixel-based setup for LCD monitors provides many advantages over CRT displays, but does have potential drawbacks arising from the fact that the image is dependent on millions of independent electrical components as opposed to a single scanning beam, so if faults occur in these components then the display output can be affected. The resulting problems include stuck or dead pixels, as well as a residual image effect.

One of the more common problems with LCD displays is the potential for stuck or broken pixels, where the pixel either does not receive a voltage and remains black, or does not respond to voltage changes and stays at a set luminance level. Sometimes this can happen for individual pixels, suggesting a problem with the pixel itself, or it can happen to groups of pixels, suggesting the possibility of problems with the display"s controller or a defect in a portion of the pixel grid.

LCD monitors can also be affected by another problem called "transient persistence" that is reminiscent of CRT burn-in. Classic burn-in would happen because the phosphor coating on the screen would get depleted by the persistent bombardment of electrons from the CRT, resulting in the inability of those sections of the display to convert the electron beam to visible light. This meant that if you kept a specific pattern showing on the screen then over time it could become a permanent residual image on the display that would show even when the display was turned off. This was a reason why screensavers were developed--to keep the wear on the screen"s phosphor coating as even as possible.

The physical burn-in of displays is no longer an issue now that LCD displays have taken over, but while transient image persistence is not a physical burn of the device, it is an alteration of the pixel response to voltage changes (usually temporary) that prevents pixels from getting as bright as others on the screen.

Similar to CRT burn-in, LCD image persistence generally happens after you have displayed a pattern of intense colors on screen; however, unlike CRT burn-in, LCD persistence can sometimes set in after only a few hours of displaying the image, as opposed to the weeks or even months that it can take for burn to set in on a CRT monitor. Additionally, unlike CRT burn-in, image persistence can often be reversed.

What happens with LCD monitors is the affected pixels have lost their ability to respond to the full range of voltages that the display gives them, resulting in a limited range of colors that can be output. This can happen if the pixel is acting like a capacitor and is retaining a residual charge, or if it is not able to reach the level of luminance that is desired when given a specific voltage. Either way, the pixel is not able to reach its full range of possible intensities.

Unlike stuck or dead pixels that may benefit from having the monitor turned on and off rapidly to produce rapid voltage changes, image persistence will benefit from a lengthy stretching of the pixel"s range. Therefore, instead of using tools like JScreenFix to run random patterns over the affected screen area, you might instead place a pure white window (such as an empty TextEdit window, or what you get using the "White" option in the LCD Repair tool listed above) over the affected area for a few hours or even a few days if necessary. Doing this will force those pixels to be fully on, and over time their intensities may increase to be the same as the surrounding pixels.

Likewise, try turning off the pixels fully by shutting down the display for a long period of time or placing a pure black texture over the affected area (see the LCD Repair tool listed above for this option as well). This will turn the pixels completely off and allow residual voltage in them to drain slowly over time.

So far we have discussed pixel-based problems with LCD displays, but the system"s backlight can also suffer some common problems that include the backlight randomly blinking off, not turning on, or only illuminating part of the screen.

If only the backlight is malfunctioning, then the LCD panel itself should still be working just fine and should be rendering the text and images of your computer"s output. To test for this, use a bright flashlight and shine it on your screen at an angle in an area where you expect images and text to be (such as the Dock or menu bar). On Apple"s laptop systems, you can shine the flashlight through the Apple logo on the back to illuminate the screen on the front and better detect text and images that way.

Televisions are an expensive purchase and they come with a maximum manufacturer’s warranty of 3 years, which is not enough. Plus, they are delicate and can start to show signs of failure if not properly maintained.

This is a common problem in TVs and is a sign that your TV panel is failing. But before you call an expert to check the TV, you could try following these steps and check if they work:

If it continues to show lines, you may mostly have to get the panel replaced and replacing the panel can be a costly affair, depending on the TV and its model. LED panels range anywhere between Rs 8,000 to Rs 85,000, while LCD panels range between Rs 6,000 to Rs 25,000.

When the TV has speakers that work perfectly fine but it has no picture, there is mostly an issue with the back-lighting system or the power supply board, which will need to be replaced. In the case of an LCD TV, it works with the help of a backlight that is used to illuminate the picture on the screen. When the backlight begins to have problems, the screen turns blank.

To fix this issue, the backlight will have to be replaced by a TV expert. Another possible reason is that the backlight on the LCD TV which has a power inverter has failed. When this happens, you may need to replace the inverter or the capacitor.

Be it a panel issue or a major technical issue with the TV, resolving these problems is a costly affair. It’s best not to ignore any of these signs and call an authorized TV expert before the problem worsens.

LCD’s do have many replaceable parts and have higher probably of repair than the old CRT box monitors. In Most cases a failed or broken Laptop Screen is worth the repair.

The AC Adapter can be easily tested with a multi-meter. This test is usually 90% conclusive if the AC adapter is good or bad. Also if the LCD has absolutely no power, no power light, no faint display, no reaction at all, the AC Adapter is a likely culprit. A quick multi-meter test can usually be done for free at most repair centers.

This is an internal part that inverts power to the needed amount for the backlight and panel. Inverters fail, and can be easily replaced. Failing inverter symptoms:

The backlight usually is simply a miniature compact Florescent light bulb. Just like what’s in office ceilings but very thin and small. This can fail like any light bulb and can be easily replaced.  Newer screens are LED and work differently.  Failing Backlight symptoms:

The panel itself can fail. The panel contains thousands of tiny pixels all connected by a mesh of thin signal cables. When a panel discolors or fails, the entire panel needs to be removed and replaced. This is less common, and is only sometimes worth the repair. Failing Panel Symptoms:

What if I break my panel? This is rather common on a laptop. Almost always its worth fixing. Usually can purchase a new panel or pull from a parted out laptop.

Other Failures. This can be anything from bad controller board or bad internal cable. These items should be diagnosed by a professional. A simple cable issue can be $5 part. Bad board might be a time to buy a new screen.

In all cases, it might be worthwhile to fix your LCD, especially on a laptop. Although with a few year old desktop LCD, you may consider a replacement, especially if you’re thinking of an upgrade.

Unfortunately, most of that stuff requires either a certified repair or a complete replacement to fix. Unless you’re especially handy with electronics and you just happen to have access to cheap replacement parts, it’s usually better to either return a monitor to the manufacturer (if it’s under warranty) or simply buy a new one. Even so, here are the most common ailments for modern LCD monitors, and what can be done to fix them…or not.

An incorrect refresh rate setting can also cause flickering. The refresh rate is the number of times the computer sends an image to the monitor per second, expressed in hertz. Most LCD monitors use either 59 or 60 hertz, though 75Hz, 120Hz, and 144Hz are also found on premium monitors. Go into your operating system’s display settings (right-click desktop and head to Display settings > Display adapter properties > Monitor in Windows 10) to make sure the right hertz setting is applied—you may need to update your video drivers as well.

Unfortunately, most other flickering symptoms are caused by a power deficiency somewhere in the monitor itself. It’s possible you could be drawing too much power from one of your home’s electrical circuits or overloading your surge protector—just move the power adapter to another plug to test this. But it’s more likely that there’s a loose or malfunctioning component in the screen assembly itself. If that’s the case, repair or replacement are the answers.

Black or single-colored lines on LCD screens are caused by a lot of different issues, but if the standard fixes outlined in the flickering section above don’t fix them (check your video and power cables for problems, install new drivers), it’s probably a physical defect in the screen itself. Try your monitor on another computer or laptop to see if the problem persists; if it does, you’re probably looking at a replacement, since the error is almost certainly in the LCD panel (the most expensive component of the monitor).

A “dead” pixel is a single dot on your LCD screen that doesn’t illuminate, showing up as one or more black squares. “Stuck” pixels are similar, but instead of showing black they’re stuck on a single color that doesn’t match the computer screen’s image, typically either red, green, or blue.

There isn’t much you can do for a dead pixel—it’s a physical malfunction of the screen panel. Luckily one or two dead pixels usually doesn’t mean you have to throw the whole monitor away; it’s certainly possible to work around it or ignore it. You can also look into a warranty replacement, though many monitor manufacturers won’t replace a screen until multiple pixels have gone out.

A stuck pixel may be a different matter. Depending on exactly how the problem is manifesting, it might be possible to get the pixel back into working order. There are various techniques for this, ranging from physically “massaging” the screen panel itself to running programs that rapidly cycle a portion of the screen through the color spectrum. You can try out some of these solutions as outlined in our guide to stuck pixels, but be warned, in my personal experience, it’s exceedingly rare to find a lasting solution to a stuck pixel.

If your monitor has a visible crack, a large discolored area, or a black/multicolored spot that doesn’t align with the pixel grid, it’s been subjected to physical trauma and the LCD panel is damaged. There’s nothing you can do here: even if your monitor is within its warranty period, it almost certainly won’t cover physical damage. You could try to replace the LCD panel itself, but since the replacement part will be almost as expensive as a new monitor anyway, you might as well start shopping.

Most of the above problems can happen to the LCD screens used in laptop PCs and tablets, too…but because of the compact build, they’re much harder to repair. That being said, the extra expense of a laptop versus a monitor might make it a much better candidate for a repair rather than a replacement. At the very least (assuming you’re out of the warranty period), it’s probably worth a diagnosis and quote at a repair shop, if you’re not comfortable replacing the screen assembly yourself.

There’re more than 300 procedures to produce TFT LCD. The most advanced LCD, in which the array and cell process are highly automatic. Technically, every step in the process can lead to defects, and most of the defects have been eliminated through the development of TFT LCD technology.

Unlike point defect, this larger scale defect is caused by the failure of external FPC or PCBA, or a bad connection between FPC and cell. Therefore, a bunch of pixels connected to these IC are out of control, and we see those defects.

In LCD, newton’s rings may occur on screen when two glass substrate haven’t been sealed well, so that one of the glass may form a convex lens and lead to light interference.

1Case 6-Abnormal Display. Bad components in power section of t-con.Case 7-Noise. Solder defect or shorted components on t-con.Case 8-Abnormal Display. Bad components in power section of t-con.Case 9-Noise. Solder defect or shorted components on t-con.Case 10-Abnormal Display. Bad components in power section of t-con.Case 11-Abnormal Display. Bad components in power section of t-con.Case 12-Noise. Bad solder connections, shorted or open components on t-con.Case 13-Noise. Bad solder connections, shorted or open components on t-con.Case 14-No display and back lights are lit. T-con Fuse Open or Bad components in power section of t-con. No voltage to t-con from main board or power supply(main board or power supply failure).Case 15-No back light. Inverter failure or power supply failure.Case 16-Dim back light. Inverter failure.Case 17-Dim back light. Inverter failure.Case 18-Dim back light. Inverter failure.

2Case 19-Uneven display. cell defect.Case 20-Uneven display. cell defect.Case 21-Damage from applied pressure to panel. Bad panelCase 22-Crosstalk. cell defect.Case 23-Crosstalk. cell defect.Case 24-Panel cracked.Case 25-Vertical block. Failed driver IC, TCP/COF failed ACF bonding to panel bad connectionfrom driver IC to TCP/COF.Case 26-Vertical line. Failed driver IC, TCP/COF failed ACF bonding to panel, bad connectionfrom driver IC to TCP/COF.Case 27-Vertical block. Failed driver IC, TCP/COF failed ACF bonding to panel, bad connectionfrom driver IC to TCP/COF.Case 28-Vertical block. Failed driver IC, TCP/COF failed ACF bonding to panel, bad connectionfrom driver IC to TCP/COF.Case 29-Horizontal block. Failed driver IC, TCP/COF failed ACF bonding to panel, bad connectionfrom driver IC to TCP/COF.Case 30-Horizontal block. Failed driver IC, TCP/COF failed ACF bonding to panel, bad connectionfrom driver IC to TCP/COF.Case 31-Horizontal line. Driver IC abnormal output. Failed driver IC, TCP/COF failed ACF bonding topanel, bad connection from driver IC to TCP/COF.

3Case 32-Horizontal block. Failed driver IC, TCP/COF failed ACF bonding to panel bad connectionfrom driver IC to TCP/COF.Case 33-Horizontal block. Failed driver IC, TCP/COF failed ACF bonding to panel bad connectionfrom driver IC to TCP/COF.

COF= Chip on film/flexTCP= Tape carrier packageIC= Integrated circuitT-con= Timing controller(board)LCD= Liquid crystal displayACF= Anisotropic conductive film

Recently, the LCD screen started to show some artifacts, like flickering, screen freeze in dark image and corner starts to get brighter. Most of the flickering happens in a horizontal pattern (horizontal lines, parts)

Searching in the web, I concluded this could be a screen inverter failure, but I have no idea if another piece of hardware could be responsible of this.

This is a general Wiki to describe the most commonly found boards inside a LCD TV. The boards are common to most TV’s but there are manufacturers and models that may either have a variation of the boards or added additional boards for further function. Those would have to be assessed and evaluated by utilizing the service manual for the specific model.

When the Main Board receives the 5V standby voltage from teh power supply board, it will be routed through a voltage regulator IC or DC-DC circuit to generate a 3.3V voltage. The 3.3V will be supplied to the MCU (microcontroller unit) IC, CPU and the Front Panel board. Now we can see the standby LED light is lit and the TV is in the Standby Mode now.

Once the back panel is removed from the TV now, each type of flat panel TV will have a distinct set of parts. LCD TV’s typically contain these circuit boards:

define what a power supply is and you will most likely get a response such as ‘that box plugged into the mains that powers my equipment’. That’s the function but what it’s doing is very complex. It’s taking raw AC from the mains, normally compatible with any supply voltage in the world (with its tolerances, dips and spikes) and converting it to a stable lower DC voltage. It will incorporate a feedback loop to keep the output voltage constant with changes in input voltage and output load current. Fast load steps will be reacted to within a designed control loop response time with minimal consequential output voltage transients. It will provide safety isolation to the highest statutory level for the highest standard mains voltage and will remain safe to a minimum level, even with a single component failure. It will have controlled radiated and conducted noise emissions to statutory levels and be immune to noise from other sources. A good design will have various levels of protection against single internal faults that might potentially cause output over- voltage, chains of multiple component failures, excessive temperatures, electric shock or even fire.

1. Through the CPU and MCU (microcontroller unit) processors it controls the system via multiple signals. For example it is the main board that tells the power board to turn on the backlight; it tells the panel when to turn on/off etc.

These steps are as generic as possible, since most LCD displays use a similar design. However, you will need to think carefully about how to take the display apart so you can put it back together, and have it still work!

The images are from Repair ViewSonic VX924 LCD Monitor Blinking Green power Button (youtube). You should watch it through once to get an idea for what it"s like.

The difference between a LED TV and a LCD TV is that they are both LCD TV’s except one has LED stripes and the other has CCFL Backlights- (Florescent Tubes). I used a Philips Magnavox Emerson LG TV when testing these repaird, but they should work on other TV brands that are similar. Before you do any Repair, check to see if you are still under warranty, or are covered by a recall of your TV!!

If your Plasma or LCD/LED or CCFL/LCD TV or monitor has stopped working, or is displaying one of the following symptoms, then it *may* need some new capacitors in the power supply board or a replacement board

If the TV is still locked and will not respond to any commands from the front panel control buttons or the remote control unit, it is apparently locked in a failure or diagnostic mode, and would probably have to be diagnosed and repaired by a reputable TV repair facility. Good luck.

If it is a thin vertical line that appears on certain video resolution/image then it is normal and is indicated in the users manual under troubleshooting. If the line is almost half the screen, it could be a problem with the cable connection between the LCD panel and logic board, or the LCD panel itself. Try reseating the cable first if it’ll solve the problem. I’ve done similar issue in the past. Reseating the cable worked for a couple of months till eventually the LCD panel is the problem. Replacing the LCD panel is quite costly and impractical.

If the lines are there all the time or intermittent but in the same location it is an indication of a bad panel. The panel driver can also be the cause of this symptom.

If the lines/bars are across the OSD Menu, and all the video signal inputs also same result, that means the TV LCD Panel is defective Most of the time this symptom is caused by a bad LCD Panel 95%. You can try refitting LVDS Cable or replacing Main Board capacitors or replacing Main Board—5%

Bad news unfortunately, their are two possible causes for what you have described, one would be a fault with the picture drive pcb ( Power Control Board ), and the other is physical damage to the LCD cell matrix, (screen).

There’s videos on how to fix this. It has to do with putting foam, in between panel frame and screen, which applies pressure to solder joints, which then completes the circuit- Contact my10cents, for better explanation.

Is the OSD menu affected as well? If yes then possibility could be the LCD Panel or the t-con board. Since you have replaced the t-con board then possibility is the LCD panel. There could be also a possibility of mainboard where upgrading the firmware could restore the picture. If the OSD menu is not affected then the LCD panel is good.

If the lines are across the OSD menu then chances is very high the LCD panel is the cause of the problem otherwise it can be due to bad T-con board or even Mainboard. Have you tested on the OSD menu to see if the lines are really across the menu?

White Lines– There are several possibilities that can cause white lines on an lcd screen. One would be high temperature on the logic board. Logic board drives the LCD panel and when it overheats can cause this display problem. One solution would be to clean the vent holes around the TV. One possibility that I have experienced myself servicing is a bloated capacitor on the power supply board. The worst possibility is a defective LCD panel, which is costly to repair, and sometime more practical to buy a new TV set.

There are several problems that could cause this problem. It could be the connection from the T-Con board to the panel, try wiggling these cables around and see if the picture comes up even for a second. The Mainboard or it’s cables are not the issue in my opinion. The isdsue is either going to be a bad capacitor, faulty output from the power supply to the T-Con board, a bad connection from T-Con to panel, or the T Con or the panel itself are faulty.

It could be the connection from the T-Con board to the panel, try wiggling these cables around and see if the picture comes up even for a second. The Mainboard or it’s cables are not the issue in my opinion. This is due to either a bad capacitor, faulty output from the power supply to the T-Con board, a bad connection from T-Con to panel, or the T Con or the panel itself are fault. Also, it’s possible the A/V receiver’s Video On feature was turned off by an electrical surge or something else.Turn the Video feature back to On and suddenly that bad blue screen was gone.

Now we need to know if PSU Board has all the correct output voltages. This means checking the secondary side output voltages of Power Board. Probable causes are the Power Supply, the T-Con board, Main Board or the LCD panel itself has failed.

You will have to go into the TV and check for capacitors or burn marks or cracked solder around the pins–Main board could be IC’s, or regulators–Panel–Disconnect panel and see if your TV stay’s on—

The flashing green light indicates a fault on the power board inside your TV. This will be due to a faulty component like a capacitor or voltage regulator. Faulty electrolytic capacitors on the power board are the most common cause of this problem. These capacitors will often leak and stop working as the TV set gets older,but could also be caused by the Main Board or the inverter board. (LCD TV ONLY) So we will have to take a look inside and maybe do some circuit testing and a visual of your boards-

In a dark room take a flashlight and at an angle shine it on the screen and see if you can see any movement. If you can see movement or see your menu then its backlight failure. If totally black screen with sound then its T-Con board. So if you see movement on a led screen, then it’s your LEDs inside the panel. If on a LCD TV you see movement and lamps are not turning on, replace inverter. If with a LCD TV your lamps turn on, with no picture replace T-Con Board.

Plasma is the most durable in terms of panel failure. LED/LCD is terrible for panel failure. (But every model gets bad apples. Samsung LED/LCD panels die frequently. LG panels are a lot more reliable.) Overall I’d say plasma is more reliable, and even if it fails, in most cases plasma is repairable, LED/LCD is expensive to repair and often difficult to troubleshoot.

A blurry image on a high-definition LCD TV is typically the result of a mismatch between the TVs resolution capabilities and the resolution of the signal that is coming from connected devices, such as a DVD player or satellite TV receiver. Typically, blurry pictures result when a peripheral device connects to the TV through non HD cables and jacks.