lcd panel failure reasons brands

I own a Philips 32" PFL 3403 LCD TV. The panel is an MVA from AOU. The TV was purchased during November, 2008. It was all the while connected through a Belkins Surge Protector to the mains. Despite the antiquated panel, I was fond of its picture quality. However, one fine evening in October, 2011, while the TV was on, the colours of the TV suddenly became pale and white, and there was ghosting / clouding of the image. The Philips Service Centre guy said it was a panel problem which cannot be repaired, and asked me to buy a new TV. To have a second opinion, I approached a reputed, independent LCD TV repair centre, to be told the same thing. When I checked online (Consumer Court), I found innumerable cases like mine, where the LCD TV has developed panel problems within three years. Most such complaints in India were related to Samsung LCD / LED TVs, may be due to purely statistical reasons such as the number of TVs sold of the brand. Some were related to Sony LCD TVs. Other brands like LG, Philips (in my case), Toshiba and Panasonic do also figure.

Not to abandon hope, I contacted "Repair & Return" of Bangalore (Repair & Return Technology India Private limited), which claims to have a state-of-art LCD panel repair facility. In turn, I was told that they are a B2B company and not B2C.

1. Why do LCD/LED panels go bad all of a sudden without any apparent reason (even when they are protected through surge suppressors and voltage stabilizers), and without any warning?

3. Repair & Return says they are a B2B firm. Since they are thriving successfully, it means there would be certainly B2C panel repair guys linked up with them. Where to find them?

There you have it, the pros and cons of different display types and some of their common failures. Remember, if you suffer a failure of any display type, we are here to help. Be sure to visit us online at gesrepair.com or call us at 1-877-249-1701 to learn more about our services. We’re proud to offer Surplus, Complete Repair and Maintenance on all types of Industrial Electronics, Servo Motors, AC and DC Motors, Hydraulics and Pneumatics. Please subscribe to our YouTube page and Like Us on Facebook! Thank you!

With quite a high initial outlay, digital signage is never cheap to install and planning a return on this initial investment is vital before embarking on any digital out of home (Dooh) campaign.One thing that can really scupper the best thought out digital signage strategy is the failure of units once they are installed. Having to replace screens can dramatically alter the running costs of a digital signage campaign and if screen failure becomes a common occurrence, any return on investment may get more and more difficult with each added failure.

Ensuring the devices do not fail and that you get the maximum from the initial investment can drastically increase the chances of getting a ROI and making the entire campaign a success. Here are some of the most common reasons LCD screens and other devices fail in a digital signage campaigns.

Over heating is perhaps the most common cause of LCD and plasma screen failure. So many different components inside a modern LCD screen are vulnerable to excessive heat. Capacitors are the main culprit in an overheating failure and are very susceptible to heat build up as are invertors and many other components.

Preventing overheating is crucial for digital signage systems both indoors and out. Ensuring airflow and somewhere for the heat to disperse such as vents or louvers is essential to prevent overheating and ensuring the unit will continue operating. All digital signage or LCD enclosures should contain fans or other air flow systems to provide this heat dispersal.

Outdoor digital signage can often fail because of a lack of protection from the elements. Waterproof LCD enclosures should be manufactured to a recognised standard such as NEMA 4 or IP54 to ensure protection against rainfall and other hostile elements such as dust.

Consideration also has to be given to cold temperatures. Whilst heat is an electronic devices main enemy, extreme cold can be just as damaging as any internal humidity or condensation can freeze in causing expansion and damage to components. Any outdoor digital signage placed in sub zero temperatures needs some sort of heater system in the signage or LCD enclosure.

LCD flat screen TVs are commonly back–lit by cold cathode fluorescent lamps (CCFL) which are often the cause of failure. Usually CCFL’s go when there is a fault with other components such as the inverter, capacitors or power supply. However, more LCD screens are being produced with back-lit LED systems that not only are far more reliable, they also use a lot less power and produce far less heat.

Sadly, vandalism is a common cause of screen failure and ensuring any public or outdoor digital signage is protected against deliberate attack is important to prevent failure. Shatterproof screens and solid steel LCD enclosures are the best method of defending against such attacks.

A defective pixel is a pixel on a liquid crystal display (LCD) that is not functioning properly. The ISO standard ISO 13406-2 distinguishes between three different types of defective pixels,

Similar defects can also occur in charge-coupled device (CCD) and CMOS image sensors in digital cameras. In these devices, defective pixels fail to sense light levels correctly, whereas defective pixels in LCDs fail to reproduce light levels correctly.

A dark dot defect is usually caused by a transistor in the transparent electrode layer that is stuck "on" for TN panels or "off" for MVA, PVA, and IPS panels. In that state, the transistor places the liquid crystal material so that no light ever passes through to the RGB layer of the display.

A bright dot defect or hot pixel is a group of three sub-pixels (one pixel) all of whose transistors are "off" for TN panels or stuck "on" for MVA and PVA panels.

A tape automated bonding fault (TAB fault) is caused by a connection failure from the TAB that connects the transparent electrode layers to the video driver board of an LCD.

TAB is one of several methods employed in the LCD-manufacturing process to electrically connect hundreds of signal paths going to the rows and columns of electrodes in layer 6 (the transparent electrode layer) in the LCD to the video integrated circuits (ICs) on the driver board that drives these electrodes.

If an LCD is subjected to physical shock, this could cause one or more TAB connections to fail inside the display. This failure is often caused by horizontally flexing the chassis (e.g., while wall-mounting or transporting a display face up/down) or simple failure of the adhesive holding the TAB against the glass. TAB faults require the replacement of the LCD module itself. If these connections were to fail, the effect would be that an entire row or column of pixels would fail to activate. This causes a horizontal or vertical black line to appear on the display while the rest of the display would appear normal. The horizontal failure runs from edge to edge; the vertical failure runs from top-to-bottom.

In LCD manufacture, it is common for a display to be manufactured with several sub-pixel defects (each pixel is composed of three primary-colored sub-pixels). The number of faulty pixels tolerated before a screen is rejected, is dependent on the class that the manufacturer has given the display (although officially described by the ISO 13406-2 standard, not all manufacturers interpret this standard the same way, or follow it at all).

Some manufacturers have a zero-tolerance policy with regard to LCD screens, rejecting all units found to have any number of (sub-)pixel defects. Displays meeting this standard are deemed Class I. Other manufacturers reject displays according to the number of total defects, the number of defects in a given group (e.g., one dead pixel or three stuck sub-pixels in a five-by-five pixel area), or other criteria.

If you ever notice multi-coloured or single-coloured vertical lines on your laptop screen, it may be a result of a hardware failure or due to damage to the screen. To try fixing it yourself, first unplug your laptop, hold the power button for 30 seconds and restart the laptop. If you continue to see coloured lines, the issue is probably with the LCD screen, which will need to be replaced from the brand’s service center. To be sure about the LCD screen problem, try connecting your laptop to another monitor and see if the issue persists. If it does, the issue is certainly in the LCD panel.

Firstly, check if your laptop’s brightness level is set to maximum. If the display is still dim, try restarting the device. This could just be a system error that can be resolved by restarting the device. Also, check if the AC adapter cord is loose and firmly connect it to the outlet and laptop. If the issue still persists, it is mostly due to a failure of the LCD. Behind the LCD, there is an inverter board and backlight bulb which control the picture.

The inverter board converts the low voltage your laptop uses, into higher voltage required by the long bulb that lights up the LCD screen. If the inverter board or bulb fail, you will experience the problem of a dimmed display. Even if one of these two components fail, the screen will need to be replaced, unless the service center can help by just replacing the bulb. We wouldn’t recommend you try resolving it yourself, as this is more complex and you could end up damaging the circuit board and the backlight lamp. So, it’s best to leave this job to an expert.

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.

If it was the lcd display, the lines would still be present regardless of the tcon i suppose. if it is a voltage issue blowing the tcon, the display is just a feedback loop through tcon to main board as opposed to the main board being the output to the tcon. is my thinking in the ball park on this?

So this image is from the new board ordered, after power cycling a few times while getting readings. it would turn on and then shut itself down. like the original board, now the tv stays powered on with the lines. once i disconnect the tcon, the lines disappear and the tv stays powered on with backlight. Off of what you had posted in your reply @oldturkey03 , it appears that the driver boards are connected to the powerboard and the lcd panel. the tcon board is connected to the lcd panel and the main board. if the driver boards and tcon are connected on this unit, it is internal and through the lcd it appears. it looks weird haha. but to trouble shoot the driver boards, i have disconnected each side of the lcd boards one at a time and the the tv will go through post and shut down.

LCDs used in outdoor situations have many concerns to deal with in addition to any that they might normally encounter during indoor use. Initially some concerns are weather related such as moisture in the air or extreme temperatures. Another concern that is often not understood or just not known about at all is sunlight damage.

Liquid crystal displays use organic components that are susceptible to UV (<400 nm) and IR (>750 nm). These bandwidths of radiation have an observable impact on the organic components in LCDs. Extended exposure has been known to cause a color shift and a washed out look to images displayed with the LCD.

In any case it is important to protect your display from the elements, especially if it is going to be exposed to harsh environments not intended by the manufacturer. One way to do this would be to utilize a Hot Mirror with a UV blocker. This will significantly reduce the amount of IR radiation between 750 nm and 1200 nm, as well as the UV radiation below 400 nm. If the LCD is going to be used outdoors for extended periods then an extended hot mirror may be necessary, which extends the bandwidth protection out to 1600 nm and will help reduce some of the longer wavelength IR damage.

Another concern with liquid crystal displays are their susceptibility to overheating due to excess IR radiation. The LCD is intended to operate within a certain range of temperatures according to the manufacturer’s instructions and outdoor use can lead to higher than normal temperatures. The display being exposed to excessive heat can cause the crystal to become isotropic and fail to perform properly. A hot mirror can help alleviate these concerns as well by reducing the amount of infrared radiation that heats the display.

Accidental Damage is any damage due to an unintentional act that is not the direct result of a manufacturing defect or failure, and is therefore not covered under the standard warranty of the LCD-Monitor. Such damage is most often the result of a drop or an impact to the LCD screen or any other part of the product which may render the device.

one is a hardware fault, the other is a software problem. Although only these two big aspects but involved in the details of the aspect is very much, the following details about the display color abnormal possible reasons and solutions.

Monitor color is not normal, we recommend the first use of the elimination method, as far as possible to eliminate some simple problems. There are many reasons leading to the abnormal display of the display color, such as checking whether the display data line is normal, the display color control panelis not set well, poor contact, or rust of the display wire may lead to such problems.

A kinescope-tube failure can cause this problem, but it is not irreparable – minor electric shocks, serious rewound filament power supply windings, and sometimes the visual discharge power supply resistance of a particular electron gun is miswelded or broken or the resistance value is increased.

In addition, there is easier to let people detour the cause of failure – screen dust caused by too much screen white when red! This kind of fault often happens in the monitor that color temperature slants warm (a lot of monitors can set color temperature by oneself), say so, encounter white (and similar color) slants red when the fault you had better be cleaned the first screen later undertake other checks, if the fault disappears, mean you won’t because of this and “unlucky” detour. Of course, too low brightness values on some models can also cause this “fault” phenomenon.

Some half professionals see the two faults as a tube in life, some of the maintenance personnel to see will say adjust the contrast and the focusing extremely potentiometer and accelerate the potentiometer on the ignition coil will be good, others say it’s caused by a hardware failure or graphics driver damage of graphics, these point of failure judgment is wrong.

The aging of the kinescope and the decline, in contrast, will not cause such failure phenomenon, as for the adjustment of the collector and the acceleration of the electrode potentiometer is not correct, this is palliative, and it is difficult to adjust to a satisfactory degree, the most troublesome is that the fault will soon return, even accelerate the aging of the kinescope.

The real failure point of the type 1 fault phenomenon is usually due to the aging of the focusing knob of the FBT. You can try to replace an FBT first. Of course, if the monitor has been in use for more than six years, then we need to take into account the possibility of tube aging. In addition, it may be the tube seat of the picture tube and the large area of the negative copper foil leakage phenomenon caused by the displacer (after analysis like design problems), so sometimes into a maintenance dilemma after the replacement of a genuine tube seat try.

The poor contact of the video card usually causes the failure of starting up and there is an alarm sound or the system is unstable resulting in a crash and other failures. The reason for the poor contact of the graphics card is that the gold finger of the graphics card is oxidized, dust, the quality of the graphics card is poor or the baffle of the case has a problem. For the golden finger oxidation caused by poor contact, can use an eraser to wipe the golden finger to solve; For dust caused by poor contact, general removal of dust can be solved; For the hardware quality caused by poor contact, usually through the replacement method to detect, generally replace the video card to solve; For the case baffle problem caused by poor contact, usually the video card can not be fully inserted into the video card slot, can be replaced by the case to eliminate.

Compatibility failure will usually cause the computer can not to start up and alarm sound, the system is not stable crash or screen abnormal miscellaneous phenomenon. Display card compatibility fault generally occurs in the computer just installed or upgrade, more in the motherboard and display card is not compatible or motherboard slot and display card gold finger can not completely contact. The video card compatibility fault usually USES the replacement method to detect, generally USES the replacement video card to troubleshoot the fault.

The failure of the components of the graphics card will usually cause the failure of the computer can not startup, the system is not stable crash, flower screen, and other fault phenomena. The damage of graphics components generally includes the damage of graphics chip, BIOS, memory, capacitance, or field-effect tube. For the damage and failure of graphics card components, it is generally necessary to carefully measure the signals in the graphics card circuit to judge the damaged components. After finding the damaged components, replace them.

The failure of the graphics driver usually causes the system unstable crash, flower screen, text image graphics card is not complete, and other fault phenomena. The video driver’s fault mainly includes the loss of the video driver, the video driver is incompatible with the system, the video driver is damaged, and the video driver cannot be installed. For the video card, driver failure generally first enter the “device manager” to see whether there is a video card driver, if not, re-install. If so, but the graphics driver has a “!”, the video card driver is not installed, the driver version is not correct, the driver and the system are not compatible. Generally, remove the video card driver reinstall, if installed after there are “!”, you can download the new version of the driver installation. If you cannot install a graphics driver, there is usually a problem with the driver or with the registry.

CMOS setup failure is caused by the error of displaying related options in CMOS. Common CMOS setup failures mainly include: integrated graphics card motherboard, CMOS graphics card shielding options setting error; For example, the “AGP Driving Control” option is incorrectly set (usually “AUTO”), “AGP Aperture Size” option is incorrectly set, and “FAST Write Supported” option is incorrectly set.CMOS error is generally modified by loading the default BIOS value.

Video card over frequency problem refers to the time spent to improve the video card speed, improve the video card’s working frequency, and lead to computer failure. When a problem occurs, the frequency can be restored to the factory default.

STONE provides a full range of 3.5 inches to 15.1 inches of small and medium-size standard quasi TFT LCD module, LCD display, TFT display module, display industry, industrial LCD screen, under the sunlight visually highlight TFT LCD display, industrial custom TFT screen, TFT LCD screen-wide temperature, industrial TFT LCD screen, touch screen industry. The TFT LCD module is very suitable for industrial control equipment, medical instruments, POS system, electronic consumer products, vehicles, and other products.

To help businesses transition from LCD to longer-lasting LED signage, Samsung has launched a trade-in program. Samsung will come on site to remove your existing display and provide a discount on a new LED bundle kit.

Traded-in LCD displays that are still operating will be refurbished and resold, and your business will receive a cash rebate. Nonworking displays will be recycled and their parts reused.