LG OLED TV F34 Error Code Guide: Fast Fix & Repair Options

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What This Error Means

F34 on an LG OLED TV means the set has detected an internal power or voltage fault.

The TV tries to start up, sees bad readings in the power or panel-drive circuits, and shuts itself down to protect the electronics.

Official Fix

What LG basically wants you to do before a tech touches it:

  • Hard power reset the TV:
    • Turn the TV off.
    • Unplug it from the wall completely.
    • Press and hold the physical power button on the TV (not the remote) for 15–20 seconds.
    • Leave it unplugged for at least 5–10 minutes.
    • Plug it directly into a wall outlet, no surge strip or extension cord.
    • Turn it back on and see if F34 is gone.
  • Rule out bad power coming into the TV:
    • Try a different wall outlet on a different circuit if you can.
    • Skip the power strip; go wall-to-TV only.
    • If F34 started right after a storm or outage, assume the power board might have taken a hit.
  • Disconnect everything external:
    • Unplug all HDMI, USB, antenna, soundbar, gaming consoles, everything.
    • Leave only the power cord connected.
    • Power on and check if F34 still shows up.
    • If the error disappears, one of the connected devices or cables is dragging the TV down.
  • Try a settings reset (if you can reach menus before it errors):
    • Go to Settings > General > Reset to Initial Settings (path can vary by model).
    • Run the full reset and let the TV reboot.
    • If F34 hits even before you can do this, skip this step.
  • LG’s official next step:
    • If F34 comes back after a full power reset and clean power source, LG considers it a hardware fault.
    • That usually means service center time: they test and swap the power supply board, main board, or panel-related boards as needed.
    • If you are under warranty or have store/credit-card protection, this is the route they will push you into.

The Technician’s Trick

Here is the kind of stuff field techs try before ordering expensive boards.

  • Strip the TV down to bare power:
    • Unplug every cable: HDMI, USB, antenna, optical, LAN, everything.
    • Leave the TV unplugged for 5–10 minutes.
    • Plug power back in and try to turn it on with the button on the TV, not the remote.
    • If it boots clean with no F34, add devices back one by one until the error returns. That tells you which device or cable is causing trouble.
  • Eliminate the sketchy power strip:
    • Tech secret: half the “TV is dead” calls are actually cooked surge protectors.
    • Go straight into the wall, on a different outlet than you normally use.
    • If the TV behaves fine there, your strip or extension cord is junk. Replace that, not the TV.
  • Quick visual check inside (only if you are comfortable opening it):
    • Unplug the TV and let it sit at least 10 minutes. No power. No games.
    • Remove the stand and back cover carefully. The OLED panel is thin and fragile, do not flex it.
    • Find the power supply board (where the AC cord connects) and the main board (HDMI ports).
    • Look and smell for damage: burn marks, dark spots, cracked components, or bulged capacitors (tops puffed up instead of flat).
    • Gently press on all multi-pin connectors and ribbon cables to make sure they are fully seated, especially between power board and main board.
    • If a connector was clearly half-out and the TV works after you reseat it, you may have just dodged a board replacement.
  • Heat-related clue:
    • If the TV turns on from cold, runs a few minutes, then throws F34 and shuts down, that screams failing board.
    • Techs use this pattern to pick the most likely culprit: often the power supply board first, then the main board.
    • No amount of resetting will permanently fix a board that trips F34 when warm – it will need replacement.

Is It Worth Fixing? (The Financial Verdict)

  • ✅ Fix: High-end LG OLED under ~5 years old, no screen damage or burn-in, and only throwing F34 – board swap is usually cheaper than a new OLED.
  • ⚠️ Debatable: Mid-range OLED around 5–7 years old or already out of warranty; get a labor + parts quote for power/main board and compare to a new set on sale.
  • ❌ Replace: Older than ~7 years, or the panel has burn-in, lines, or cracks plus F34 – do not sink money into it; put that cash toward a new TV.

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