LG OLED TV Error F37 – Fast Fix Guide

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What This Error Means

F37 on an LG OLED TV usually means an internal temperature / cooling fault is being detected.

In plain terms: the TV thinks it’s overheating or getting a bad reading from a temperature sensor or cooling fan, so it either shuts down or refuses to start to protect the panel.

Official Fix

What LG wants you to do before a service call:

  • Power it down properly
    Turn the TV off. Unplug it from the wall for at least 5 minutes.
  • Give it breathing room
    Make sure the back and bottom vents aren’t smothered by the wall, cabinet, or soundbar. You want at least 4 inches (10 cm) of clearance all around the back and the bottom edge.
  • Clear obvious dust
    Use a vacuum with a brush or a can of compressed air around the vent slots. Do not poke anything inside the holes or remove the back cover.
  • Bypass the junk power
    Unplug from any power strip or surge protector. Plug the TV directly into a known-good wall outlet.
  • Cold start
    Plug back in. Turn it on. Watch for the F37 message or shutdown within a few minutes.
  • If F37 comes back
    LG’s official next step: stop there and contact LG support or an authorized service center. The manual treats this as an internal fault that needs a board, fan, or sensor check and replacement. They do not expect the user to open the TV.

If the set is in warranty, don’t open it. Let LG handle it. Opening the case will likely void coverage.

The Technician’s Trick

Here’s what people who fix these every day actually try before calling it a dead board.

  • Hard discharge reset
    • Unplug the TV from the wall.
    • On the TV itself (not the remote), press and hold the power button for 15–20 seconds.
    • Let it sit unplugged another 5 minutes.
    • Plug back in and power on.

    This drains residual charge from the power board and can clear a stuck protection flag that throws F37.

  • Force-cooling test (cheap sanity check)
    • Set a small desk fan to blow across the back of the TV (aim at the middle / upper area).
    • Turn the TV on and run it as usual.
    • If F37 disappears or it stops shutting down while the external fan is running, you’re likely dealing with real heat buildup or a weak internal fan, not just a random glitch.
    • If F37 still shows instantly, it’s probably a bad sensor or main board misreading temperature.
  • Kill the always-on modes
    • On the remote, go to Settings > All Settings > General.
    • Disable things like Quick Start+ or Always Ready / similar standby features.
    • Power the TV fully off with the remote and leave it off for a minute, then turn back on.

    Those modes keep circuits warm in standby. On borderline hardware, that’s enough to tip it into F37.

  • Update the firmware
    • Go to Settings > All Settings > Support > Software Update.
    • Check for updates and install if available.

    On some LG sets, weird sensor / protection codes calm down after a firmware update.

What a shop tech does behind the scenes (only if you’re experienced and out of warranty): open the back, verify the cooling fan actually spins, check for clogged dust felt, meter the temperature sensor (thermistor) for sane resistance, and if that all looks good, swap the main board or power board. For a regular homeowner, that’s “take it to a pro” territory.

Is It Worth Fixing? (The Financial Verdict)

  • ✅ Fix: TV is under 5–6 years old, panel looks perfect, and a shop quotes you roughly $150–$350 for a cooling fan / sensor / main board repair.
  • ⚠️ Debatable: TV is 6–8 years old, repair quote is around half the price of a new OLED, or you already had one major repair done on this set.
  • ❌ Replace: TV is 8+ years old, F37 comes with other issues (burn-in, lines, random reboots), or the repair involves the OLED panel itself or a $400+ board job.

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