Last Updated on November 4, 2023 by Jhonni Jets
LED TVs have become incredibly popular in homes around the world. Their thin profiles, energy efficiency, hi-def picture quality and affordable prices make them a top choice for home entertainment. However, one issue that can pop up on LED screens is a shadow or darkened area visible over part of the display.
This shadow is caused by an LED backlighting failure or malfunction. The LEDs provide the backlight that allows the LCD pixels to display a picture. When some of these LEDs start to fail, a dark shadow emerges on the screen. Luckily, there are a few different ways to attempt fixing an LED shadow yourself before paying for an expensive TV repair or replacement.
Table of Content
This guide will cover common causes of LED shadows and provide troubleshooting steps you can follow to remove the shadow from your LED television. We’ll explore adjustments like changing backlight settings, using a flashlight to locate dead LEDs, performing LED strip repairs and more.
By the end, you should have a better understanding of what causes LED shadows and some DIY solutions to try getting rid of those frustrating dark spots on your TV screen. Let’s dim those shadows for good and restore your LED TV’s picture back to full brightness!
What Causes Shadows on an LED TV?
Before jumping into fixes, it helps to understand exactly what causes shadows or dark areas to appear on an LED TV screen:
- Failed LED backlights – The LED strips or individual LEDs responsible for providing backlight have burned out or failed in that area. Very common.
- Disconnected LEDs – Issues with wiring or connectivity have caused some of the LEDs to disconnect and stop receiving power.
- Power supply failure – The TV’s power supply has partially failed and can’t deliver full voltage to all LEDs.
- Component failure – Problems with LED driver ICs or control boards that power the LED backlights.
- External light – Rare, but a bright light source behind the TV could project a shadow onto the screen.
By far the most common cause is simply failed or disconnected LED backlight strips or individual LED diodes. The LEDs are very thin and don’t have a long lifespan, especially with constant heat cycles. Eventually some will expire, causing visible shadows.
LED TV Backlight Repair Tips
Here are some troubleshooting steps you can follow yourself to attempt fixing shadows and dark spots on an LED TV caused by backlight failures:
1. Adjust Backlight Settings
Start simple by bumping up the backlight setting in your TV’s menu. This may help compensate for a partially failed backlight and diminish any shadows:
- Navigate to Picture Settings in the main menu.
- Increase Backlight or Backlight Intensity to maximum.
- Turn off Power Saving and Energy Saver modes which reduce backlighting.
- Enable Dynamic Contrast for adaptive backlight adjustments.
2. Locate Dead LEDs
Use a bright flashlight to pinpoint exactly which LEDs have failed in the area of the shadow:
- Carefully pry off the TV’s back panel to expose innards.
- Darken room and turn TV on displaying a white screen.
- Hold bright flashlight very close to back of LED strips.
- Failed LEDs will remain dark when lit by flashlight.
- Mark their location so you can target repairs.
3. Reflow LED Strips
Reflowing reconnects broken solder joints causing LEDs to fail. Use a heat gun:
- Heat problem area of LED strips to 360°F – 400°F for 1-2 minutes.
- Allow LED strips to naturally cool down afterwards.
- Failed LEDs may reactivate after reflowing the solder.
4. Replace LED Strips
If many LEDs are dead or reflowing doesn’t work, replace the bad LED strips:
- Purchase replacement LED strips matching TV model.
- Carefully detach bad strip and install new strip.
- Ensure proper connectivity and polarity when replacing.
5. Replace LED Driver Board
The LED driver provides power and controls dimming. Swap it if LEDs won’t turn on:
- Buy replacement driver board for TV’s specific model.
- Disconnect and remove old driver board.
- Install new driver board and reconnect cables.
These repair tips should help revive failed LED backlights causing dark shadow spots. Adjusting settings may compensate for minor issues, while flashlight inspection lets you target dead LEDs for repair or replacement.
Advanced LED Shadow Fixes
For difficult shadows that basic backlight repairs can’t eliminate, there are a few advanced fixes to try:
Specialized calibration software can digitally compensate for LED failures by boosting surrounding LED brightness. Results vary.
Inverter Board Replacement
The inverter delivers high-voltage power. If LEDs flicker or won’t light, a new inverter may be needed.
As a last resort, a damaged mainboard could be preventing LEDs from lighting properly. Replace it.
Worst case, the LED panel itself has too many failed LEDs to repair. Swapping the panel will eliminate shadows.
While involved, these advanced fixes can be performed at home with some technical skill. Component-level fixes may be needed for severe backlight issues causing stubborn shadows on the screen.
Troubleshooting Tips for LED TV Shadows
Follow these troubleshooting tips when attempting any LED backlight repair for shadow fix:
- Check existing LED functionality by displaying a white screen in a dark room. Bad LEDs will be obvious.
- Use an LED backlight tester tool to identify exact LEDs that have failed. Makes repairs more targeted.
- Don’t apply too much heat during any reflow attempts to avoid damaging the fragile LED strips.
- Check cables, connectors and voltage levels to ensure LEDs are receiving adequate power.
- Try an LED inverter or driver board replacement before doing a more invasive panel replacement.
- Research repair guides for your exact TV model number before attempting any fixes.
- Always use proper ESD (electrostatic discharge) measures like wrist straps when working on sensitive components.
Following basic troubleshooting practices like these will give you the best chance of success removing pesky LED shadows from your TV with DIY backlight repairs.
When to Call a TV Repair Service
While the LED backlight fixes covered in this guide are reasonably safe for home DIY repairs, more extensive issues may require professional repair services:
- For very large shadows spanning over 30% of the screen or multiple areas.
- If you don’t feel comfortable working with exposed electrical components inside the TV.
- Advanced troubleshooting with voltmeters, oscilloscopes, etc is needed to diagnose issue.
- The specific replacement part for your TV model is unavailable or discontinued.
- If repairs attempt cause further damage or don’t resolve the LED shadow.
- For older TVs where replacement parts are difficult to source.
TV repair technicians have experience fixing all types of LED backlight issues causing shadows and dark areas on the screen. They can source difficult-to-find parts and have proper tools to safely perform advanced repairs.
The cost is usually reasonable – between $100 to $300 depending on repair complexity. Get a free quote before approving repairs.
Preventing LED TV Shadows
While not always possible to prevent LEDs from eventually failing, you can proactively care for your TV to extend backlight life:
- Don’t leave TV powered on for long periods when not watching. Frequent on/off cycles wear out LEDs faster.
- Use a surge protector to avoid power spikes that can damage LED components.
- Ensure adequate ventilation around the TV to prevent overheating which accelerates LED degradation.
- Limit direct sunlight shining onto the TV when possible. Intense UV rays weaken LEDs.
- Adjust brightness conservatively and avoid maxing it out constantly. Running LEDs at lower brightness extends their lifespan.
- Use dust covers and gently clean outside of TV to prevent dust buildup which can hold in heat.
- Handle TV carefully when moving to avoid shaking and damaging delicate LED strips.
While following TV care best practices can maximize LED backlight lifespan, shadows and dark spots will eventually occur for most TVs as LEDs fail over time. Using the troubleshooting steps outlined in this guide will hopefully allow you to repair those irritating shadows yourself and maintain a bright, high-quality picture.
Shadows and dark areas ruining your LED TV’s picture can often be repaired at home without needing expensive professional repairs or an outright replacement. Inspecting and reflowing or replacing failed LED backlight strips is an affordable fix in many cases.
Advanced troubleshooting of components like inverter boards and mainboards may be necessary for more complex issues causing severe shadows. Proper preventative care can also prolong the lifespan of delicate LEDs.
Hopefully this LED shadow troubleshooting guide gives you a better understanding of what causes dark areas on the screen along with actionable repair tips. With some patience and care, you can likely banish those annoying shadows for good and restore your LED TV’s picture. Enjoy clear, brightly lit viewing for many years to come thanks to reliable LED backlight maintenance and repair.