Samsung TV & Audio QN65QN90CAFXZA 65" Class QN90C Neo QLED 4K Smart TV BACKLIGHT FAILURE Error Fix: LED Backlight Strip Failure — No Picture

Error code BACKLIGHT FAILURE on the Samsung TV & Audio QN65QN90CAFXZA 65" Class QN90C Neo QLED 4K Smart TV means: LED Backlight Strip Failure — No Picture. TV has audio and backlight briefly flashes on startup, then screen goes completely dark. Flashlight against screen reveals faint picture. A single failed LED (open-circuit from thermal stress) can cause LED driver to shut down all strips. LED strip replacement is the most common Samsung LED TV repair requiring complete disassembly — removing back cover, all boards, LCD panel, and optical films. LED strip kits $25-80. Handle LCD panel with clean cotton gloves — damage during disassembly is the biggest risk.

The most successful fix is "Replace LED Backlight Strips" (hard difficulty, ~120 minutes). Estimated DIY cost: $25-$80. HomeMD has 2 community-ranked fixes for this error.

This error is rated high severity. You should address it promptly — continued use could cause damage or safety concerns.

Yes — the top-ranked community fix ("Replace LED Backlight Strips") is rated hard difficulty and takes about 120 minutes. Tools needed: T20 Torx screwdriver, Plastic pry tool, Multimeter, Cotton gloves.

DIY cost: $25-$80. Professional repair typically costs $200-$350. 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.

Error code BACKLIGHT FAILURE also appears on 3 other Samsung TV & Audio models: QN55LS03BAFXZA 55" Class The Frame QLED 4K Smart TV, QN65Q80CAFXZA 65" Class Q80C QLED 4K Smart TV, UN55CU8000FXZA 55" Class CU8000 Crystal UHD 4K Smart TV. The fix may vary by model, so check each model's specific page for tailored repair steps.