LG TV & Audio OLED65C4PUA 65" Class C4 4K OLED evo Smart TV OLED PSU FAIL Error Fix: OLED Power Supply Board Failure

Error code OLED PSU FAIL on the LG TV & Audio OLED65C4PUA 65" Class C4 4K OLED evo Smart TV means: OLED Power Supply Board Failure. OLED TVs have specialized power supply boards generating precise voltages for the OLED panel. Symptoms: no picture with normal audio, dim picture not responding to brightness settings, color channel dropout (reddish/greenish tint), or complete power failure. OLED PSU is high-value component ($150-300). Uses higher-quality components than LED TV power boards.

The most successful fix is "Replace the OLED Power Supply Board" (medium difficulty, ~90 minutes). This fix costs nothing. HomeMD has 2 community-ranked fixes for this error.

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

Yes — the top-ranked community fix ("Replace the OLED Power Supply Board") is rated medium difficulty and takes about 90 minutes. Tools needed: T20 Torx screwdriver, Anti-static wrist strap, Multimeter.

DIY cost: $0. Professional repair typically costs $250-$350. 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 OLED PSU FAIL also appears on 3 other LG TV & Audio models: 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.