screen is very dim on led backlit lcd panel for sale

I have researched this problem and found that it does indeed indicate that some hardware components may be bad. The following solution seems to be effective in most cases, but it requires very fine soldering skills:

They sell the components mentioned as a kit on their website which consists of the coil, an "IC" (really this is just a diode), and 3 "filters" (capacitors). They have an excruciatingly detailed video showing how to change these parts, but the right soldering equipment is essential. They also list this kit on Ebay - search for "iPhone 5 backlight coil".

I had this problem too... and fixed it in about 10 min. I searched the internet for this problem and found many forums with pretty much the same resolution... REPLACE TV. I find it interesting that in almost every single case I read over the last 24 hours... no one... absolutely no one recommended a simple Problem Determination (PD) procedure to quickly determine if the issue was in the TV or outside the TV.

Supposedly people spoke to techs on the phone, which in most cases are reading from a tech manual... or try to dial in and update TV firmware remotely... what I didn"t see or read is where someone actually had a repairman look at it.. or did actual PD to eliminate issues with cables or devices connected to the TV.

My Curved Samsung UN55JU6700 among several other devices... is connected to an Xfinity HDR and through HDMI cables. So.... the first thing I wanted to do was to see if the problem went away if I changed channels... it did not. Then, would the issue move when using another HDMI source...

I turned on my APPLE TV and switched to that as the source. I immediately noticed that the issue appeared to go away... so for grins, I tried my DVD player... and still the problem did not return...

Now I know its either the HDMI cable feeding the signal or the xFinity box itself... so I tried a different cable and the problem did NOT go away this time... Now I"m highly suspecting the Xfinity DVR device. I powered off the HDR but the problem still remained ... No I"m thinking Im going to have to spend an hour on the phone with a tech that knows less then I do... or spend an hour or two at the Comcast store waiting for a replacement DVR. SO BEFORE I did that, I tried one last PD step ... I decided to UNPLUG the DVR and let it do a complete POWER ON RESET ... in case something got hosed during the last firmware update.... 10 minutes later... my SAMSUNG is working flawlessly once again. DONE, FIXED (at least in my case).

So ... if your having this issue... BEFORE panicking from all these doomsayers on the net... that in many cases sell or repair TV ... try some simple PD ... hopefully you"ll be lucky like I was.

Desktop and laptop computer LCD monitors sport a long light bulb to display the video. When this bulb burns out, the screen dims to almost black. Failing backlights can also cause the picture to flicker, blink on and off or offer an odd color cast to the screen.

Troubleshooting Before assuming the backlight bulb is the issue, check to make sure the monitor is connected properly and receiving power. Watch for the power light near the On/Off switch when you plug in the monitor, and verify all cables are connected tightly and appear undamaged. If possible, connect a different monitor to your computer using the same cables to verify the computer"s video card is sending a picture. If everything else seems in good working order, the monitor could have suffered a backlight failure.

Testing, Testing Various things can cause your monitor to go dark, ranging from a burned-out backlight bulb to a monitor-killing short circuit. In most cases, a monitor with a burned-out bulb still has an image on the screen, it"s just very dim. Look closely at your screen; if you see absolutely no picture at all, the monitor itself may have gone belly up. A bad bulb can be tested, but only if you have a working replacement bulb and are comfortable opening your monitor and doing some checking.

Some Disassembly Required As you would guess, checking the backlight bulb on your monitor requires actually getting into the screen and pulling out the suspect light. Monitor disassembly varies by model; check your monitor"s manufacturer"s website for instructions. Once you have the bulb out, disconnect it from the inverter board that powers it and connect your working bulb. If the new one lights, your old one was dead. If the new one is as dark as the first, your inverter board may have failed and will need replacement.

Seek Professional Help Because cracking open your laptop or desktop monitor can leave other parts vulnerable to unintentional damage, you have to be confident in your abilities to attempt backlight testing. One wrong move could fry another component, leaving you worse off than befire. If the idea of opening up a monitor and fiddling with the insides makes you nervous, seek out the help of an experienced technician. Replacing a bad bulb or inverter board is a relatively inexpensive fix to extend the life of your equipment.

One of the top buzzterms in LED LCD marketing is "local dimming." Ostensibly, local dimming can dim the area of the screen that needs it, while keeping the bright parts of the screen bright. This technology can really increase the contrast ratio to make a better image. It"s also vital to get the intense highlights possible with High Dynamic Range (HDR) content.

LED LCDs don"t have the OLED (or plasma, may it RIP). As such, their images don"t have quite the depth and three-dimensionality that"s possible with other technologies.

This is the full monty. The name refers to an array of individual LEDs behind the LCD panel, all pointing out through the screen toward your eyeballs. A mock-up example is shown at right, if the front LCD layer was removed and the LED backlight exposed.

While individual control of all these LEDs would be ideal (though rarely implemented), the most common method is a set number of "zones." Depending on the TV, these could number in the dozens or more. Unfortunately, most LED TV makers don"t disclose the number.

Each zone is responsible for a certain area of the screen. Objects smaller than the zone (stars in the night sky, for example), don"t benefit from the local dimming, and can look muted as a result. Also, if a zone is lit, and an adjacent zone isn"t lit, you could see a halo/bloom as that part of the screen becomes brighter than its neighboring zone. This artifact is commonly known as "blooming."

At its best, full-array backlit local dimming produces the best images you can get with LCD. It"s also always more expensive than TVs from the same company with one of the other backlighting methods discussed below.

The downside is size and cost. The LEDs have to be set back from the screen a little (the farther away, the fewer you need to cover the same area), so there"s additional depth compared to the edge-lit models.

Local dimming, in this case, becomes a bit looser of a term. Yes, the TV can still dim areas of the screen, but those areas are much larger than they are with full array, as you can see in the image above.

Worst-case, the "local dimming" could be nearly invisible, or dim huge swaths of the screen at a time, neither offering any benefit. In some cases, it could result in a worse picture.

Best-case, there"s a noticeable improvement in the picture quality, though not as much as there would be with full array. The pin-point highlights of HDR aren"t possible here, though some models might still offer Wide Color Gamut (which is related to HDR, but separate).

Depending where the LEDs are (along all four sides of the screen, just the right and left, just the top and bottom, or just the bottom or the top), edge-lit local dimming can have widely different performance.

One last trick isn"t really "local" dimming as much as it"s just "dimming," or maybe "global dimming." The entire image will get darker with dark scenes, and stay bright with bright scenes. As in, the entire backlight functions as one single light. This is common among the least expensive LCD TVs.

It"s common on these models, for example, that when given a full black image (like the fade-out at the end of a movie, but before the credits start) the LEDs will shut off completely, making the TV seem like it has a really good black level.

This is fake, of course. If anything should appear, the LEDs kick back on, and the black level jumps up, revealing the TV"s true (and far more muted) contrast ratio. There are some tiny energy-saving benefits to turning off the LEDs, but visually this is can be distracting.

Another variation of this theme senses the average brightness of the scene and, during darker scenes, ratchets down the whole backlight. Again black levels improve because the whole screen is darker, but this is at the the expense of bright highlights. Sometimes this causes visible fluctuations in overall brightness.

It all comes down to "don"t believe the marketing hype," at least not at face value. Local dimming can be a way to get near-OLED levels of picture quality. Or, it can offer some improvement compared with basic TVs, creating a pleasing, if not class-leading, image. Or, it could be a marketing label for something that"s not really much benefit at all. As usual, the best way to know is to check the reviews, where TVs with good local dimming do really well.

Got a question for Geoff? First, check out all the other articles he"s written on topics like why all HDMI cables are the same, TV resolutions explained, LED LCD vs. OLED, and more. Still have a question? Tweet at him @TechWriterGeoff then check out his travel photography on Instagram. He also thinks you should check out his bestselling sci-fi novel and its sequel.

LED-backlit LCD TVs typically come in one of two sub-types of panels: Vertical Alignment (VA) or In-Plane Switching (IPS). VA panels tend to have much high contrast ratios, and therefore better black uniformity. IPS panels, on the other hand, have worse contrast ratios and suffer from more backlight issues that can affect black uniformity, including "IPS glow", which is a kind of "glow" effect that can be seen in the corners of IPS screens.

LED-backlit LCD TVs are prone to black uniformity issues, but OLED TVs can produce virtually perfect blacks because their pixels are self-emitting, and therefore don"t have the same limitations caused by improper backlight implementation. That means they don"t suffer from clouding or flashlighting as LED TVs do.

Poorly designed backlight placement. The type of backlight and its position directly affects the uniformity of the screen. The worst uniformity can be found on edge-lit LED TVs, because the LEDs are only on the edge of the screen. Full-array LED TVs have good uniformity because their LEDs are spread out across the whole screen. Some edge-lit TVs have great uniformity. You can learn more about different backlights here.

Non-uniform frame pressure. Both the LCD screen and the diffuser layers are somewhat flexible. A slight difference in pressure on the frame of the television can change the uniformity of the picture. On some televisions, this can be fixed (see below).

Uneven lighting intensity. Sometimes, the intensity between two lighting components can vary in a set (for example, one LED could be slightly brighter than an LED next to it). This is less likely to happen with a brand new TV but can start appearing over time if some components age and degrade faster than others.

Flashlighting can sometimes be fixed on some televisions. If the flashlighting is caused by pressure from the TV"s frame, you can adjust it by slightly loosening or tightening the screws behind the edge of the screen. Some TVs don"t expose the screws, however, so this won"t always be possible. You should also keep in mind that a small change in the tightness of a screw can have a big impact on the uniformity of the screen, so be careful if ever you do try this step. While this can fix the issue, we don"t recommend it unless you know exactly what you"re doing, as it may cause more problems than it solves.

For clouding, there"s a pretty simple fix that—while not guaranteed—can have good results. Power on the TV and display a black image. This will allow you to see the lighter spots on the screen. Next, take a soft cloth and massage those brighter spots to improve the uniformity. You should only apply very gentle pressure, just barely touching the screen. You can also try a few different stroking patterns. If you are patient enough, this works surprisingly often, especially on edge-lit TVs, although you should be very careful to avoid damaging your screen.

Alternatively, you might consider returning or exchanging your television. Some models are more prone than others to having issues. Even within the same model, some units can have more uniformity issues than others because of slight variation in the manufacturing or shipping process. It can be worth trying to exchange it for the same model before going with an entirely different TV. Extreme cases of clouding are also covered under a TV"s warranty.

Backlight uniformity issues don"t increase over time unless a large amount of stress is put upon the panel (in the case of a big temperature swing, for instance, or if the TV is moved).

Sometimes, just letting the TV settle for a few days after unpacking it can solve the issue. This is especially true if the TV is laid on the side during shipping/moving.

Black uniformity refers to how evenly a TV can display black across the screen, especially when displaying a bright object over a dark background. It’s important when watching dark scenes in a dark room, and while most people shouldn’t notice black uniformity issues like flashlighting and clouding, they can become more apparent when the issues are especially bad. You won’t need to worry about these problems in rooms with lights on, though. For each TV, we take a photo of a black frame to capture the black uniformity, and then we calculate the color values of the pixels to find the standard deviation of the uniformity. We then do the same with local dimming enabled.

You may be able to remove flashlighting (to some degree) by tightening the screws of the TV’s frame. This can have pretty dramatic effects on the picture, though, so you should be very careful when attempting this. For clouding, gently massaging problem areas with a soft cloth often does a good job of fixing bad uniformity. In the end, the safest bet may be to simply return or exchange your TV if you can, since uniformity varies between individual units.

LCD panels are backlit by LED lights, so they rely on a backlight behind the panel to make the picture visible, and the LCD layer can"t prevent all light from escaping out of the screen. This means that even in a black scene, the backlight is still on, and some light escapes, causing blacks to appear gray.

In an attempt to mask this shortcoming, some LED TVs employ local dimming to target dark portions of the screen and dim the backlight in those areas. The intended result is that dark portions become darker, but everything else is left as bright as it should be, increasing the contrast between dark and light objects.

OLEDs use self-emitting pixels and don"t have a backlight, and because of this, they don"t have local dimming features. However, we score OLEDs as a perfect 10 for local dimming, because they do everything that a local dimming feature on an LED TV should do. Dark areas are completely off, leaving bright areas to stand out without any blooming.

Some TVs offer different local dimming settings. Low settings will usually dim the backlight less, but then the local dimming will also be less effective at improving the contrast. Higher settings will dim more, but may also make blooming, or other related issues, more visible. Local dimming preferences are subjective, so if you have multiple options, try out the different settings and choose the one you like best. Apart from that, there"s no way to get better results from local dimming. If this is a feature that matters to you, be sure to get a TV that scores highly in this test.

Contrast/Brightness: These settings aim to improve the contrast ratio by tinkering with the white and black levels. It doesn"t have a direct effect on the local dimming but can improve the picture quality. The contrast setting increases the luminosity of the brightest whites, while brightness (sometimes called black level), makes blacks darker. Keep in mind the brightness setting on some TVs controls the backlight, which doesn"t affect picture quality.

Samsung"s UHD Dimming: This processes the video in an attempt to mimic local dimming. It doesn’t dim the backlight but instead changes the contrast of different areas of the picture. Video purists usually dislike it, because it messes with the video settings of the TV, changing contrast from frame to frame. We don’t recommend using it.

Frame dimming: Frame dimming, or CE dimming on Samsung TVs, is a basic version of local dimming, but it dims the entire backlight instead of zones. Usually found on edge-lit TVs, it causes small highlights to become dim as well. It may improve the contrast a bit, but it"s not very useful for most scenes.

Local dimming features on LED TVs are a way to improve the contrast ratio. Since these TVs consist of LED backlights behind an LCD panel, local dimming aims to turn off, or dim, certain zones of the LED backlight, making blacks look darker and highlights brighter. However, there may be some issues with local dimming on some TVs as it could cause blooming around bright objects or for entire zones to light up when there"s a small object. Overall, most local dimming features on modern TV do an effective job at improving the picture quality in dark scenes, and only some lower-end models will have glaring problems.

On iPad, you can make your screen dimmer or brighter (dimming the screen extends battery life). You can also adjust the screen color and brightness manually or automatically with Dark Mode, True Tone, and Night Shift.

Dark Mode gives the entire iPad experience a dark color scheme that’s perfect for low-light environments. With Dark Mode on, you can use your iPad while, for example, reading in bed, without disturbing the person next to you.

Schedule Night Shift to shift the colors in your display to the warmer end of the spectrum at night and make viewing the screen easier on your eyes.Go to Settings

To identify your computer"s model and to see if it is eligible for this program, choose Apple () menu > About This Mac. Eligible models are listed below.

Please choose one of the options below for service. Your MacBook Pro will be examined prior to any service to verify that it is eligible for this program.

Note: If your MacBook Pro has any damage which impairs the service, that issue will need to be repaired first. In some cases, there may be a cost associated with the repair.

The program covers eligible MacBook Pro models for 5 years after the first retail sale of the unit or 3 years from the start date of this program, whichever is longer.

If you"re having difficult reading the information on your machine"s display, try changing the contrast setting. Adjusting the contrast will give the information a sharper and more vivid appearance.

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I tried that too, no luck. It says "Auto Adjust in process" when you turn it on. The power button light stays amber. When you turn off and turn it back on, it is fine for a fraction of a second then shows the message and turns dark. Same with other computers. HELP !!!!!

The television is one of the most common electronic in any household. Even in the age of digital media, people choose to spend their free time at home with their families watching television.

Some people are hooked to watching show after show, putting their eyes at risk. But screen type is not the only factor in eye-healthy screen time. It really depends on the TV brightness, room lighting, distance from the screen, and view time. How? Let’s break it down:

Whatever type of television you have, it emits light with most TVs emitting at least 50% of blue light. Because blue light is closer to UV rays on the light spectrum, it may have similar qualities to how it affects people. Blue light exposure has long been linked to health issues such as eye damage, vision loss, and insomnia. So, as the brightness of your TV is increases, the color, and contrast of the image decrease, causing eye strain.

Ambient lighting should be present in the room when watching TV. It’s not a good idea to watch TV in complete darkness -- yes we’re talking to you late-night viewers. The room’s brightness should be adequate and comparable to the television. Even in theaters, the lights are never completely off, just dimmed; that same rule should apply to your home.

The closer you go to the television, the more your eyes begin to strain. For both kids and adults, it is not necessary nor healthy to sit close to the screen. The basic rule is to sit at least five times as far away from the screen as it is wide. So, if your television is 32 inches wide, for example, the ideal viewing distance is 160 inches or around 13 feet.

The recommended viewing distance for televisions with 4K resolution is one and a half times the screen size. The recommended distance for HDTVs is three times the screen size of the TV. These guidelines also go for children, who may be the biggest culprits in non-safe viewing practices. If you must, rearrange your living room to space out the good seats away from the TV.

How does that translate into TV screen types? And what screen type should people use to better protect their eyes when watching various shows on television?

The most common display technologies are LED and LCD. The latest TV display technology is OLED, which is only available on high-end TVs. The pixels used to provide the display are the difference between LCD, LED, and OLED. When compared to LED backlight, OLED has a far higher resolution and delivers cleaner, better graphics.

An OLED (Organic Light-Emitting Diodes) screen consists of numerous pixels that emit its own light. Each pixel is made up of three separate RBG – red, blue, and green – OLEDs. OLEDs are true emissive components that produce light on their own and do not require a light source. Meaning they produce a light that’s more natural and less harsh on your eyes.

OLED TVs also provide excellent color and contrast because they do not use light from other sources to display colors, as LCD/LED TVs do. They also, on average, produce around 20% less blue light than LCD displays.

Both LCD and LED TVs work in similar ways to each other. The only difference between the two is the type of backlighting. A TV labeled as an LED utilizes LED illumination for the white backlighting instead of fluorescent (CFL) lamps.

While LED LCD TVs are more appealing than CFL LCDs, they cannot compete with OLED panels since the LCD/LED front panel is a liquid color display that is not self-emissive. Which is the biggest disadvantage of LCD/LEDs in terms of eyesight. Although they produce quality images, the color and contrast from these displays are due to their light sources, so they give off more brightness that can cause eye strain if not moderated.

To sum it up, OLED displays are better for your eyesight. They have more natural lighting, better color contrast, and a wider color range. However, no matter what type of display you have, you will hurt your eyesight if you don’t practice safe TV viewing.