LG TV & Audio OLED65C3PUA 65" Class C3 4K OLED evo Smart TV SIMPLINK FAIL Error Fix: HDMI-CEC Device Control Failure

Error code SIMPLINK FAIL on the LG TV & Audio OLED65C3PUA 65" Class C3 4K OLED evo Smart TV means: HDMI-CEC Device Control Failure. SimpLink (LG HDMI-CEC) fails to detect or control a connected device. Ensure SimpLink is enabled: Settings → General → Devices → SimpLink → On. Power cycle all CEC-connected devices. Unplug HDMI cable and reconnect. Some third-party devices have limited CEC compatibility. Limit to 2-3 CEC devices to avoid conflicts.

The most successful fix is "Replace HDMI Cable and Update Firmware" (medium difficulty, ~30 minutes). Estimated DIY cost: $10-$25. HomeMD has 2 community-ranked fixes for this error.

This error is rated low severity. It is generally not urgent and can often be resolved with a simple DIY fix.

Yes — the top-ranked community fix ("Replace HDMI Cable and Update Firmware") is rated medium difficulty and takes about 30 minutes. Tools needed: TV remote control.

DIY cost: $10-$25. Professional repair typically costs $100-$180. Many homeowners save money by trying the top-ranked community fix first.

The LG TV & Audio OLED65C3PUA 65" Class C3 4K OLED evo Smart TV has 8 other known error codes, including: ABNORMAL TEMP (OLED Panel Over-Temperature), APP CRASH (App Freezes or Crashes), AUDIO SYNC (Audio Out of Sync with Video), BANDING (Horizontal or Vertical Banding), BLINK 2X (Power Supply Overcurrent / Short), and 3 more.

Error code SIMPLINK FAIL also appears on 6 other LG TV & Audio models: 55UQ7570PUJ 55" Class UQ75 Series 4K UHD Smart TV, 75NANO75UQA 75" Class NanoCell 75 Series 4K Smart TV, 86QNED80URA 86" Class QNED80 4K QNED MiniLED Smart TV, OLED55B3PUA 55" Class B3 4K OLED 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.