We'll take you through what light bars are used for, whether you can fit them yourself and whether they're legal here in the UK.

LED Backlightfor Monitor

Another cause of backlight shorts is faulty assembly procedures. During device fabrication, these solder joints are protected by piece of black tape—however, during the screen refurbishing process some manufacturers neglect to replace the tape, apply it misaligned, or fail to apply it securely. As a result, the screen initially works during testing—but once the metal LCD shield is installed, the exposed solder joints touch the grounded frame, shorting the backlight circuit.

To diagnose whether your device is “dead” or just has a malfunctioning screen, try connecting it to your computer. If the computer recognizes the device, then the problem probably resides with the LCD screen or backlight circuit.

LED BacklightStrip for TV

Water damage is a frequent source of backlight problems. Water will corrode the LCD connector pin/pad junction, which breaks the electrical path to the connector and can damage the filter.

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The most common cause of a self-induced short occurs from working on the device with the battery still connected. Even when the screen is dark, there is voltage in the backlight circuit. A slipped pair of tweezers or misalignment of the LCD connector can short the backlight circuit to ground. Avoid self-induced shorts by always disconnecting the battery before working on a device.

This content is almost entirely sourced from Reed Danis and his iPhone/iPad Backlight Troubleshooting page. Users were finding this content when searching for TV related backlight issues so we repurposed it for TV.

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LED Backlightfor TV that changes with picture

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Dead LED TV sets LED strips can be repurposed to be used as 12 volt LED lighting for backup power, in RV and campers, in a vehicle, etc. Typical each LED on a strip are 3.2 - 3.8 volts, however in some bigger TV sets (60+ inches) each LED can be 4.5 - 7.2 volts. So if you know how to use a soldering iron and how to cut & modify the traces on the strips you can repurpose the LED strips in that dead TV set.

LED BacklightStrips

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Most hardware operates at voltages between 1.8 V - 5.2 V. However, the backlight circuit operates at about 15 - 20 V. At this higher voltage, the backlight components are more prone to damage when a short circuit occurs. The high voltage backlight circuit is also prone to corrosion from water damage.

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Replace the backlight driver capacitors. These will be near where the LED strips plug into the main PCB and will be of a higher voltage value like 100uF @ 100v or something. These caps see alot of load and heat if the TV set is used alot. They go out of spec and cause the backlight power supply not to function or they cannot hold capacity to drive the LEDs. The factor stock caps tend to be cheap and low tier so you want to replace with a better quality like nichicon and get the correct uF value but you can get higher voltage just not lower voltage that what is there already.

LEDTVbacklightstrip Replacement

Actually the LED backlights operate anywhere from 12 - 72 volts with several backlight strips in series on one or more power channels with current limitation. Also some use PWM to adjust brightness with changes in the program image on screen. Each LED on a strip will have a lens over it that directs the light back onto a white backing instead of straight out in front.

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The good news is that nearly all backlight failures are repairable. Once the damaged component is identified it can simply be replaced. Follow this Samsung Television Backlight Replacement guide for more details.

Backlight circuit failure can also occur from damage to the electrical traces on the circuit board. If the electrical traces buried in the board are inadvertently severed—for example, from trying to fasten the board with too large a screw—the backlight circuit will not conduct power to the backlight LEDs.

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Backlight shorts can occur when the latch for the ZIF connector securing the LCD flex is missing. The LCD flex slides out an angle and the high voltage backlight pin contacts the ground pin, causing a short circuit.