LG OLED TV Error F25 – Fast Fix Guide

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What This Error Means

F25 on an LG OLED TV usually means a panel / main-board communication or power protection fault.

The TV sees bad feedback from the panel or power board, then shuts itself down to avoid frying expensive parts.

Typical symptoms:

  • TV clicks on, maybe flashes logo, then F25 pops up and it shuts off.
  • Standby light blinks, screen stays black, F25 shows briefly.
  • Sometimes you get sound for a second, but the picture never fully comes up before it errors.

Bottom line: the brain of the TV (main board) and the power/panel don’t agree on what’s happening, so the set throws F25 and bails.

Official Fix

This is the safe, manual-style path. Do this first.

  • Step 1 – Hard power reset
    – Turn the TV off.
    – Unplug it from the wall.
    – Hold the TV’s power button (on the set, not just the remote) for 15 seconds.
    – Leave it unplugged for at least 5 minutes.
    – Plug it directly into a wall outlet (no surge strip or power bar).
    – Turn it on and see if F25 still shows.
  • Step 2 – Strip everything off the TV
    – Unplug every HDMI and USB device (cable box, game console, streaming stick, external drive).
    – Disconnect sound bar / AVR (use TV speakers only).
    – Try powering on again with just the power cord connected.
    – A bad HDMI device or cable can sometimes trip protection errors.
  • Step 3 – Check power source
    – Test a different wall outlet on a different circuit if you can.
    – Avoid cheap extension cords and old power strips.
    – If the outlet is loose or you hear crackling, stop and get the outlet fixed first.
  • Step 4 – Software update (if the TV stays on long enough)
    – With the TV on (even if F25 pops up after a while), hit Settings > All Settings > Support > Software Update (or similar, varies by model).
    – Run an update if one is available.
    – After the update and reboot, test again.
  • Step 5 – Full factory reset
    – If you can get into menus: Settings > All Settings > General > Reset to Initial Settings.
    – Confirm and let it wipe everything.
    – Set the TV up again from scratch and see if F25 returns.
  • Step 6 – Official line from LG
    – If F25 keeps coming back after all that, the official answer is: internal hardware fault.
    – Manual solution: contact LG or an authorized service center for board-level diagnosis and repair.
    – If you’re still under warranty or extended coverage, do NOT open the TV. Let LG handle it so you don’t kill the warranty.

The Technician’s Trick

Out of warranty and not scared of a screwdriver? This is what field techs actually do before calling it dead.

Warning: Unplug the TV. If opening electronics makes you nervous, stop here.

  • Step 1 – Get the back off safely
    – Unplug the power cord from the wall.
    – Take the TV off the wall mount and lay it face down on a clean, soft surface (blanket, foam, no grit).
    – Remove the stand if it’s in the way.
    – Pull all the screws around the back panel and lift the rear cover off.
  • Step 2 – Reseat the panel ribbons
    – Find the thin flat ribbon cables going from the main board to the panel edge boards.
    – One side at a time: flip the little latch, slide the ribbon out, inspect for burns or kinks, then slide it back in straight and fully, and lock the latch.
    – Crooked or half‑seated ribbons can absolutely trigger F‑type panel errors.
  • Step 3 – Reseat power and signal harnesses
    – Follow the thick multi‑wire plugs between the power supply board and main board.
    – Unplug each connector, then plug it back in firmly until it clicks or feels fully seated.
    – Do the same for any other harnesses going to smaller boards (IR / button board, Wi‑Fi module, etc.).
  • Step 4 – Quick visual check
    – Look for burnt spots, cracked components, or leaking / bulged capacitors, especially on the power board.
    – If you see obvious burn damage, that board is almost certainly bad.
  • Step 5 – Rebuild and test
    – Put the back cover on loosely with a few screws, stand the TV up, and plug it in.
    – Power on and see if F25 is gone.
    – If the TV now boots normally, it was likely a flaky connection; fully reassemble.
    – If F25 is still there, pros usually try a replacement main board first. If that doesn’t fix it, it’s often the panel or power board, and the set may not be worth saving.

Is It Worth Fixing? (The Financial Verdict)

  • ✅ Fix: TV is under warranty or under ~5–6 years old, no burn‑in, and a shop quotes you for one board swap that’s clearly cheaper than a new OLED.
  • ⚠️ Debatable: TV is 6–8 years old, out of warranty, estimate involves both main and power boards, or the repair cost lands around 40–60% of a new set.
  • ❌ Replace: Panel shows burn‑in or lines plus F25, or you’re told the panel itself is bad, or the repair quote is more than ~60% of a new comparable LG OLED.

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