LG TV & Audio 75NANO75UQA 75" Class NanoCell 75 Series 4K Smart TV ERROR 109 Error Fix: Network Certificate Error

Error code ERROR 109 on the LG TV & Audio 75NANO75UQA 75" Class NanoCell 75 Series 4K Smart TV means: Network Certificate Error. The TV SSL/TLS certificate validation failed when connecting to a server. The TV date/time may be incorrect. Check Settings → General → Date & Time and ensure automatic date/time is enabled. If the date is wrong, set it manually. Factory reset may be needed if the certificate store is corrupted. Update firmware for latest root certificates.

The most successful fix is "Perform Firmware Update and Factory Reset to Refresh Certificate Store" (medium difficulty, ~30 minutes). Estimated DIY cost: $0-$10. 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 ("Perform Firmware Update and Factory Reset to Refresh Certificate Store") is rated medium difficulty and takes about 30 minutes. Tools needed: TV remote control.

DIY cost: $0-$10. Professional repair typically costs $120-$180. Many homeowners save money by trying the top-ranked community fix first.

The LG TV & Audio 75NANO75UQA 75" Class NanoCell 75 Series 4K Smart TV has 8 other known error codes, including: APP CRASH (App Freezes or Crashes), AUDIO SYNC (Audio Out of Sync with Video), BACKLIGHT BLEED (Backlight Bleeding / Clouding), BACKLIGHT FAILURE (LED Backlight Strip Failure — No Picture), BACKLIGHT STRIP FAIL (LED Backlight Strip Physical Failure), and 3 more.

Error code ERROR 109 also appears on 6 other LG TV & Audio models: 55UQ7570PUJ 55" Class UQ75 Series 4K UHD Smart TV, 86QNED80URA 86" Class QNED80 4K QNED MiniLED Smart TV, OLED55B3PUA 55" Class B3 4K OLED Smart TV, OLED65C3PUA 65" Class C3 4K OLED evo Smart TV, OLED65C4PUA 65" Class C4 4K OLED evo Smart TV, OLED65G3PUA 65" Class G3 4K OLED evo Gallery Edition Smart TV. The fix may vary by model, so check each model's specific page for tailored repair steps.