Samsung TV & Audio QN65QN90CAFXZA 65" Class QN90C Neo QLED 4K Smart TV LED DRIVER FAIL Error Fix: LED Backlight Driver Circuit Failure

Error code LED DRIVER FAIL on the Samsung TV & Audio QN65QN90CAFXZA 65" Class QN90C Neo QLED 4K Smart TV means: LED Backlight Driver Circuit Failure. LED driver circuit (constant-current driver on power supply board) has failed. Same symptoms as strip failure: screen dark, audio present, faint image with flashlight. But LED strips are functional — driver is not supplying power. Differentiate: disconnect LED strip connector, measure driver output voltage with multimeter. Zero voltage = driver failed (strips likely fine). Full voltage but TV dark = LED strip has open circuit pulling driver into protection. Replacing power supply board (includes LED driver) restores function. Samsung power boards $50-150.

The most successful fix is "Test and Replace Power Supply Board with LED Driver" (hard difficulty, ~90 minutes). Estimated DIY cost: $50-$150. 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 ("Test and Replace Power Supply Board with LED Driver") is rated hard difficulty and takes about 90 minutes. Tools needed: T20 Torx screwdriver, Multimeter, Plastic pry tool.

DIY cost: $50-$150. Professional repair typically costs $150-$300. 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 LED DRIVER FAIL 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.