That being said, if too much voltage is applied to an LED or if too much current flows through it, then that will kill an LED.īut this is highly unlikely to happen in a TV unless something happens in the LED driver circuit to cause an increase in voltage/current to the LEDs. This can reduce their lifespan and the amount of light that they produce will reduce over time. Increasing the brightness of the LED backlight won’t cause the LEDs to burn out.īut increasing the brightness of LEDs in general increases the temperature of the LED. Does increasing the backlight brightness cause LEDs to burn out? Power supplyĪ power supply failure will also prevent the LEDs from turning on. If the driver circuit fails to supply the correct voltage and current to the LEDs, then this can kill the LEDs. LED driving circuitĪnother reason for backlight failure is the failure of the LED driving circuit. This can result in dark spots on the screen. Sometimes, LEDs that are damaged can still conduct electricity, even though they don’t produce any light. The result is a very dim screen that can only be viewed in a dark room. This means that a single defective LED can cause an open circuit causing all the other LEDs to be extinguished. The LED strips in an LED backlight are wired in series. This can prevent power getting to the LCD panel. Power surges can cause damage to electronic components in the regulator circuit such as rectifier diodes and electrolytic capacitors. Here are some of the main causes of LED backlight failure: Power surges In this scenario, the light is not distributed evenly on the screen and is caused by one or more of the LED strips moving out of place. This causes similar symptoms to the half bright screen symptoms mentioned above.
If your screen turns blue then this is a result of the LEDs producing blue light instead of white light. This can happen either left to right or top to bottom depending on the location of the LEDs. This causes the screen to be bright on one side and dark on the other. This happens in edge-lit displays when the LEDs fail on one side. It’s sometimes possible to see the lens at the bottom of the screen and you can often hear them rattling around if you move the TV. Light spots on the screen can occur when the lens falls down from the LED strips. This usually happens when LEDs are still conducting electricity despite not producing any light. This can happen when some of the LEDs are broken whilst the others are working normally. It’s also worth checking the power cable and/or other cables attached to your TV to see if a break in any one of these cables is causing the issue. Flickering screenĪ dying backlight can cause the screen to flicker on and off. But equally, it could be a result of one or more defective LEDs. Dim screenĪ dim screen could be the result of the brightness and/or contrast settings being turned down on your TV. Instead you will see darkness but you may still hear the audio.
In this case the TV is on and is producing images, but because the backlight is broken and not illuminating the screen, you won’t actually see them. If an LED backlight fails or partially fails, then it’s likely that you will notice one or more of the following symptoms: Black screen Here are some things to look out for: LED TV backlight failure symptoms The LEDs in the TVs backlight are instead made out of semiconductors which produce light when a voltage is applied and as an electrical current flows through them.Īlthough LEDs can’t burn out as such, they can become defective severely affecting the quality of the picture. LED TVs do however have strips of LEDs that can sometimes become defective resulting in either a black screen, a flickering screen or a screen that shows black or light spots. LED TVs do not “burn out” because they don’t contain incandescent bulbs that contain metal filaments. They need an LED backlight because the pixels in an LCD TV are transmissive and are unable to light up by themselves.īut, how reliable are they, and do they burn out? Here’s what you need to know about LED TV burn out: LED TVs are simply LCD TVs with LED backlights. The LEDs in a TV should last for at least 50,000 hours at maximum brightness with continuous usage.The LEDs in the TVs backlight can become defective which can severely affect the picture.LED TVs do not contain incandescent bulbs and do not “burn out”.When you purchase through links on our site, we may earn an affiliate commission. Disclosure: Tech Parasol is supported by its readers.
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