Samsung TV & Audio QN65QN90CAFXZA 65" Class QN90C Neo QLED 4K Smart TV POWER CYCLE Error Fix: TV Turns Off and Restarts Repeatedly

Error code POWER CYCLE on the Samsung TV & Audio QN65QN90CAFXZA 65" Class QN90C Neo QLED 4K Smart TV means: TV Turns Off and Restarts Repeatedly. The TV spontaneously powers off and reboots, or enters a continuous boot loop. Common causes: overheating (ensure 4 inches clearance around vents), firmware bug (update via USB), failing power supply capacitors, main board instability from BGA solder joint failure, or auto-off settings. Check Settings → General → System Manager → Time → Sleep Timer — ensure no timer is set. Disable Eco Solution features. If the TV boot-loops without reaching the menu, a firmware reflash via USB may be required — place firmware on a FAT32 USB drive and hold the power button during boot.

The most successful fix is "Firmware Reflash and Power Supply Board Replacement" (hard difficulty, ~90 minutes). Estimated DIY cost: $10-$20. 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 ("Firmware Reflash and Power Supply Board Replacement") is rated hard difficulty and takes about 90 minutes. Tools needed: T20 Torx screwdriver, Multimeter, USB flash drive.

DIY cost: $10-$20. Professional repair typically costs $250-$450. 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 POWER CYCLE also appears on 7 other Samsung TV & Audio models: HW-B650 3.0 Channel 330 Watt Soundbar with DTS Virtual:X and Bluetooth, HW-Q990C 11.1.4 Channel 546 Watt Soundbar with Dolby Atmos, DTS:X, and Wireless Subwoofer, HW-S800B Ultra Slim 3.0 Channel 360 Watt Soundbar with Dolby Atmos and Bluetooth, QN55LS03BAFXZA 55" Class The Frame QLED 4K Smart TV, QN65Q80CAFXZA 65" Class Q80C QLED 4K Smart TV, QN65S90CAFXZA 65" Class S90C OLED 4K Smart TV, and 1 more. The fix may vary by model, so check each model's specific page for tailored repair steps.