TVs

TV backlight has failed

A dead backlight shows as a black or very dim screen with sound still working. It's a common failure on LED/LCD TVs and usually needs professional part replacement.

Difficulty
Professional only
Time
20–30 minutes to diagnose, 1–2 hours to repair
DIY cost
$20–$60 for a kit if comfortable with electronics
Pro cost
$150–$350

Symptoms

  • Screen is black or extremely dim
  • Faint image visible with a flashlight in a dark room
  • Sound plays normally
  • Some sections of the screen are dim while others work (partial backlight failure)

Likely causes

  • CommonOne or more LED backlight strips have failedLED strips behind the panel burn out individually or in sections over years of use.
  • CommonBacklight driver circuit on the power board failedThe board that supplies power to the LED strips can fail even if the strips themselves are fine.
  • PossibleLoose backlight connectorA connector can shake loose from moving or wall-mounting the TV.

What to do

  1. In a dark room, shine a flashlight close to the screen and look for a faint image, confirming the panel works but the backlight doesn't.
  2. Check if the dimness is uniform or only in patches, which helps identify how many LED strips have failed.
  3. Power cycle the TV by unplugging it for a minute to rule out a temporary glitch.
  4. Note the TV's age and model; backlight repair kits exist for many common LED/LCD models.
  5. Decide whether replacement labor cost makes sense compared to the TV's age and replacement cost.
  6. Have a technician open the panel to test and replace the specific failed strips or driver board.

Tools and parts

  • Flashlight
LED backlight strip replacement kitSearch: “TV LED backlight strip repair kit for model”

When to call a pro

Backlight replacement is a common and often worthwhile repair on newer LED TVs; for TVs older than 7–8 years, compare the repair cost to a new TV first.

Safety

Use caution

Never open the back panel while the TV is plugged in; capacitors inside can hold a dangerous charge for minutes after unplugging.

Related guides

Operator provides AI-generated troubleshooting information. It can be wrong. For safety-critical, electrical, gas, structural, medical, automotive safety, or other high-risk problems, consult a qualified professional.