My TCL TV Backlight Not Working (Here’s What I Did)

Yesterday 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 was on. You know, what the flashing standby light means! Right?

So, 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.

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

Testing the Backlight

testing tcl tv backlight using smartphone flashlight

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, grabbed a flashlight and brought it close to the TV screen, shining the light directly onto the surface. Then 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 to the center of the screen.

This indicated that, the backlight was damaged.

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 is faulty.

What causes the TV’s backlight to be damaged?

identifying the bad tcl tv led backlight

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 LED 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.

TCL TV Backlight Replacement Guide

ways to repair tcl roku tv backlight

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

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

Here’s how:

  • First, unscrew all the screws from the back of the TV, and then open the back panel.unscrewing the back panel of the tcl tv
  • Turn the TV around and remove the frontal housing and the LED panel.removing tcl v lcd panel housing
  • Now take out the bezel that holds the backlight diffuser.taking out the bezel that hold tcl tv backlight
  • Check all the LEDs and identify the faulty ones.testing the tcl tv faulty backlight strip
  • After identifying the bad LED remove it from the LED strip and replace it with a new one.replacing the tcl roku tv led backlight

That’s it…

Tip: I have written a step-by-step guide with a bunch of images and infographics on how to repair a TV LED backlight. If you want to try repairing your TV backlight yourself, check out this article.


But if you are a novice in the DIY field and don’t have enough courage to disassemble and then reassemble the TV,  Hand it over to an experienced TV repairer!

Because if you try to do it yourself, you will end up damaging the entire LCD panel.

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: Is a faulty backlight the only reason for a blank screen on my TCL TV?

No, there are other potential causes of a blank screen.

It could be a problem with the mainboard, the power supply, or even the display panel itself. Troubleshooting would help narrow down the issue.

Q: How can I determine if the backlight inverter is the problem?

One way is to shine a flashlight on the screen while the TV is on.

If you can see faint images or the TV’s menu, the backlight might be the issue. This suggests that the backlight is not illuminating the screen properly.

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 $60-$110, but this can vary widely depending on the issue.

Leave a Comment