Samsung TV & Audio QN65QN90CAFXZA 65" Class QN90C Neo QLED 4K Smart TV LOCAL DIMMING FAIL Error Fix: Mini LED Local Dimming Zone Malfunction

Error code LOCAL DIMMING FAIL on the Samsung TV & Audio QN65QN90CAFXZA 65" Class QN90C Neo QLED 4K Smart TV means: Mini LED Local Dimming Zone Malfunction. One or more local dimming zones fail to dim properly or remain permanently bright/dark. Samsung Neo QLED TVs use hundreds to thousands of Mini LED zones. A failed zone controller, driver IC, or Mini LED cluster causes a persistent bright spot, dark patch, or out-of-sync dimming area. Disable local dimming to verify: Settings → Picture → Expert Settings → Local Dimming → Off. If artifact disappears with local dimming off, the dimming system has a fault. Hardware repair requires local dimming driver board or panel assembly replacement. Contact Samsung for warranty evaluation.

The most successful fix is "Replace Local Dimming Driver Board or Panel Assembly" (hard difficulty, ~120 minutes). Estimated DIY cost: $100-$400. HomeMD has 2 community-ranked fixes for this error.

This error is rated medium severity. It should be addressed soon, but your appliance may still function in a limited capacity.

Yes — the top-ranked community fix ("Replace Local Dimming Driver Board or Panel Assembly") is rated hard difficulty and takes about 120 minutes. Tools needed: T20 Torx screwdriver, Plastic pry tool, Anti-static wrist strap.

DIY cost: $100-$400. Professional repair typically costs $300-$600. Many homeowners save money by trying the top-ranked community fix first.

The Samsung TV & Audio QN65QN90CAFXZA 65" Class QN90C Neo QLED 4K Smart TV has 8 other known error codes, including: 2 BLINKS (Power Supply Board Fault), 5 BLINKS (LED Backlight / Driver Protection Shutdown), 6 BLINKS (Main Board / T-CON Communication Failure), ANYNET FAIL (Anynet+ (HDMI-CEC) Not Working), APP CRASH (App Freezes or Crashes), and 3 more.