LG TV & Audio OLED65C4PUA 65" Class C4 4K OLED evo Smart TV NO SIGNAL Error Fix: HDMI No Signal Detected

Error code NO SIGNAL on the LG TV & Audio OLED65C4PUA 65" Class C4 4K OLED evo Smart TV means: HDMI No Signal Detected. The TV displays "No Signal" on the selected HDMI input. Check that the external device is powered on. Try a different HDMI cable (use Ultra High Speed HDMI for 4K/120Hz). Try a different HDMI port. Check HDMI port settings: Settings → General → Devices → HDMI Settings → ensure correct HDMI mode (Standard vs Enhanced/4K).

The most successful fix is "Inspect and Repair HDMI Port or Replace Main Board" (hard difficulty, ~120 minutes). Estimated DIY cost: $0-$30. 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 ("Inspect and Repair HDMI Port or Replace Main Board") is rated hard difficulty and takes about 120 minutes. Tools needed: T20 Torx screwdriver, Compressed air can, Tweezers, Anti-static wrist strap.

DIY cost: $0-$30. Professional repair typically costs $200-$400. Many homeowners save money by trying the top-ranked community fix first.

The LG TV & Audio OLED65C4PUA 65" Class C4 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 NO SIGNAL 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, OLED65C3PUA 65" Class C3 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.