Symptoms
- One half or section of the screen is noticeably dimmer
- Dark area has a visible straight edge or boundary
- Rest of the screen displays normally
- Problem is constant regardless of content
Likely causes
- CommonPartial LED backlight strip failureLED backlights are arranged in strips or zones; one section can fail while others keep working.
- CommonDamaged backlight driver for one zoneTVs with local dimming zones can have one zone's driver circuit fail independently.
- PossibleLoose internal connector to part of the backlight assemblyA connector serving one section can shake loose from moving or mounting the TV.
What to do
- Confirm the dark area stays in the same spot regardless of what's playing, ruling out a content or app issue.
- Power cycle the TV by unplugging for 60 seconds to rule out a temporary glitch.
- Check if the dark section has a faint image using a flashlight in a dark room, confirming the panel underneath still works.
- Note the exact size and location of the dark area, which helps a technician identify the affected backlight zone.
- Avoid pressing on the screen to try to fix it, which can cause further damage.
- Get a repair quote and compare it to the TV's age and replacement cost before deciding.
Tools and parts
- Flashlight
LED backlight stripsSearch: “TV LED backlight strip replacement for model”
When to call a pro
Partial backlight failure needs a technician to open the TV and replace the affected strip or driver; weigh this against the TV's age.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.