TCL TV Backlight Not Working? Here’s What I Did

Yesterday at night, I was excited to watch my all-time favorite show—Money Heist.

I powered on my TCL TV and was waiting to power it on, but even after two minutes, its screen remained black.

At first, I thought “TV might be not getting power; either the power cord has been damaged or the outlet burnet out

Then I noticed that the standby light is on. You know, this means the TV is getting power. I performed some basic troubleshooting like unplugging and replugging the TV, but nothing worked.

However, being a TV technician, I always keep some basic DIY tools like screwdrivers, multimeters, and hot glue in my house.

So, I decided to test some components whether my backlight was faulty or not.

TCL TV backlight is not working (Testing the parts)

Checking the Backlight if it's Faulty

To begin with, I wanted to determine the cause of the issue. I had a hunch that it might be related to the backlight, so I decided to check it first.

I grabbed a flashlight and brought it close to the screen, shining the light directly onto the surface. I looked closely and noticed that a faint image was visible, but it was extremely dim and hard to see. This led me to conclude that my TV’s LED backlight had been damaged, possibly due to a sudden surge of electricity.

I continued to shine the flashlight on different areas of the screen and noticed that the image became clearer as I moved the light closer to the center of the screen. (My TV’s backlight was damaged)

I then replaced the backlight strip with a new one, which only took me 25-30 minutes.

However, if you can also see a faint image on your TV’s screen after following the above procedure, it’s likely that your TV’s backlight inverter has been damaged.

What causes TV’s backlight to be damaged?

What causes TCL TV's backlight to be damaged

Several reasons exist why your TCL TV’s backlight can be damaged. These include:

  • Electrical issues: If there is an issue with the electrical supply to the TV, such as a power surge or voltage fluctuation, it can damage the backlight.
  • Physical damage: If the TV is subjected to physical abuse, such as being dropped or hit, it can damage the backlight.
  • Age: As the TV ages, the backlight may wear out and become damaged.
  • Overheating: If the TV is in a poorly ventilated area or is subjected to high temperatures, it can also damage the backlight.

So, what’s the solution?

replacing tcl tv's faulty backlight

Hand it over to an experienced TV repairer!

Yes, that’s right.

Because if you try to do it yourself, you will need to disassemble both the back and TV display panels. This can be a delicate process, and if you are not careful or do not have the necessary experience, you may end up damaging your TV beyond repair.

Have enough experience to do this yourself? Excellent!

Here’s how to replace your TCL Roku TV’s backlight

You will need a screwdriver, replacement LED flexible strips, wires, and a soldering iron.

Warning: You are going to disassemble your TV. It may lead to serious damage if you make any mistake.

  • First, unplug your TV and remove it from the wall or stand it is mounted on.
  • Unscrew all the screws from the back of your TV, and then open the back panel.
  • Turn the TV around and remove the frontal housing and the LED panel.
  • Now take out the bezel that holds the backlight diffuser.
  • Check all the LEDs and identify the faulty ones. After identifying the bad LED remove it from the LED strip and replace it with a new one.
  • Finally, reassemble the TV by screwing it back into place.

Before replacing the faulty LED, make sure that the replacement LED has the same values as the faulty one. If the replacement LED has different values, it may not function properly or fail after a certain time.

Here’s a good video tutorial from youtube that might help you to better understand this process.


Q: How do I know if my TCL TV backlight is not working?

The most obvious sign that your TCL TV backlight is not working is a dark or dim picture on the screen, even when the TV is turned on.

You may also notice that the screen is flickering, or that the picture is distorted or discolored.

Q: What can cause the backlight on a TCL TV to fail?

The backlight on a TCL TV can fail for several reasons, including a faulty power supply, a damaged backlight inverter, a defective LED driver, or a broken LED strip.

Aside from these, exposure to extreme heat or cold, as well as mechanical damage, can also cause the backlight to fail.

Q: How much does it cost to repair a TCL TV backlight?

The cost of repairing a TCL TV backlight will depend on the extent of the damage and the specific components that need to be replaced.

It’s difficult to give an accurate estimate without knowing the specifics of the situation, so it’s best to visit your nearest TV repair shop for a proper quote.

In some cases, the cost of repairing a backlight may be around $30-$50, but this can vary widely depending on the issue.

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