LG OLED TVs use F-series error codes such as F21–F40 to flag abnormal operating conditions, from power irregularities and board communication faults to firmware issues and panel protection events. These codes are triggered when on-board diagnostics detect something outside safe limits, and they are designed to protect the TV from further damage. This hub brings all of the most common F-codes together so you can quickly identify what the message means, decide what you can safely try yourself, and know when it is time to call LG support or a professional technician.
LG OLED TV F21–F40 Error Code Summary
| Code | Meaning (at a glance) |
|---|---|
| F21 | General start-up, power, or main board fault |
| F22 | Protection triggered during the power-on sequence |
| F23 | Internal communication or control-board error |
| F24 | Power supply irregularity detected by self-check |
| F25 | Panel drive or back-end video circuit issue |
| F26 | Potential main board or signal-processing fault |
| F27 | Error during panel initialization or control |
| F28 | Possible firmware, software, or configuration conflict |
| F29 | Input, video, or HDMI handshake problem |
| F30 | Persistent internal error requiring service check |
| F31 | Overcurrent or protection on an internal power rail |
| F32 | Thermal or ventilation-related protection event |
| F33 | Advanced panel or power-distribution fault |
| F34 | Fault that may need board or panel repair |
| F35 | Intermittent fault detected in internal circuits |
| F36 | Self-test error, often after restart or update |
| F37 | Signal, timing, or panel-drive mismatch |
| F38 | Serious internal error; protection shutdown |
| F39 | Persistent communication error between boards |
| F40 | Critical hardware fault flagged by diagnostics |
Detailed LG OLED TV F-Code Explanations
F21: LG OLED TV F21 Error Code Fix (No-Nonsense Guide)
F21 on an LG OLED TV usually appears when the set detects a fault during start-up, often related to the power supply, main board, or a brief power disturbance. You might see the TV power-cycle, fail to start, or shut down shortly after the LG logo appears. Basic checks include power-cycling, verifying the outlet and surge protection, and disconnecting external devices before moving on to deeper diagnostics.
F22: LG OLED TV F22 Error Code Fix
The F22 error code is typically linked to the TV’s internal protection circuits stepping in during power-on, often after an unstable power event or an internal component fault. Symptoms can include the TV attempting to start and then switching back to standby with F22 shown on-screen or via diagnostics. Home users should rule out power issues and test with all accessories disconnected before assuming that a board replacement is required.
F23: LG OLED TV F23 Error Code Fix
F23 generally indicates that the TV has detected an internal communication or control-board error, which can stop the set from completing its normal start-up sequence. In practice, you may experience freezing at the logo, repeated restarts, or the TV remaining stuck with no picture. Because the underlying cause can range from corrupted settings to failing circuitry, the full guide walks through safe resets first and then structured hardware checks.
F24: LG OLED TV Error F24 – Fast Fix Guide
LG OLED error F24 is often associated with the power supply detecting an irregular voltage or current condition and forcing the TV into a protective shutdown. The screen may flash, click, or attempt to come on before shutting down and showing F24. Addressing it starts with verifying stable mains power, removing high-draw USB or HDMI devices, and then evaluating the power board if the fault persists.
F25: LG OLED TV Error F25 – Fast Fix Guide
F25 usually points to a problem in the panel drive or back-end video circuitry, where the electronics that control the OLED panel are not behaving as expected. This can present as no picture, distorted video, or the TV shutting down soon after a picture appears. The guide explains how to differentiate between a simple firmware or cable issue and a likely panel or board-level failure.
F26: LG OLED TV F26 Error Code Guide (Real-World Fix)
An F26 error is commonly linked to faults on the main board or signal-processing path, where the TV handles video and audio data. You might notice loss of picture or sound, lockups when launching apps, or immediate shutdowns accompanied by the code. Careful elimination of software glitches, external device conflicts, and overheating is essential before considering main board repair or replacement.
F27: LG OLED TV F27 Error Code Fix Guide
F27 typically appears when there is a problem during panel initialization or control, meaning the TV struggles to bring the OLED panel online cleanly. Users may see flickering, lines, or a brief glow before the TV switches itself off. The detailed guide covers safe power resets, input isolation, and the point at which panel-drive related work should be left to a professional.
F28: LG OLED TV F28 Error Code Fix Guide
F28 on LG OLED sets is often associated with firmware, software, or configuration conflicts, especially after updates, power cuts during an update, or major setting changes. The TV may boot to a black screen, crash while loading webOS, or become unresponsive to the remote. Structured steps such as soft resets, cache clearing, and carefully executed firmware reloads are covered in the full article.
F29: LG OLED TV F29 Error Code Fix Guide
Error F29 frequently coincides with input or HDMI handshake problems, where the TV and connected devices fail to negotiate a stable signal. You may see the code when switching inputs, using a game console, or trying to play HDR content, sometimes along with intermittent black screens. The guide walks through testing with different cables, ports, and devices, adjusting HDMI settings, and identifying when the fault is inside the TV rather than the source device.
F30: LG OLED TV F30 Error Code Fix Guide
F30 generally signals a persistent internal error that the TV cannot clear with a normal restart, potentially involving multiple boards or power rails. In day-to-day use, this can look like repeated failed start-ups, erratic behaviour in webOS, or sudden shutdowns under load. Because causes vary, the full guide outlines a step-by-step process from non-invasive resets to when it is safer to stop and seek professional diagnosis.
F31: LG OLED TV Error F31 – Quick Fix Guide
LG OLED error F31 is commonly associated with overcurrent or protection trips on one of the TV’s internal power rails. The set may click on and off, dim abruptly, or shut down under bright scenes or high volume. After eliminating external shorts from connected devices, further investigation usually centres on the power or main board and is best approached with proper tools and safety precautions.
F32: LG OLED TV Error F32 – Fast Fix Guide
F32 often shows up when the TV’s thermal or ventilation safeguards detect conditions that could lead to overheating. Real-world signs include the TV running for some time and then shutting down, especially during bright, HDR, or gaming content, sometimes accompanied by unusually warm cabinet temperatures. Improving airflow, checking for blocked vents, and reviewing picture settings for excessive brightness are the first-line steps before suspecting failing cooling or power components.
F33: LG OLED TV F33 Error Code Guide (Real-World Fix Breakdown)
F33 typically points to more advanced panel or power-distribution issues, where the voltages feeding the OLED panel are outside their expected ranges. This can produce banding, flashing, partial images, or immediate safety shutdowns. Because of the risk of panel damage, the detailed guide focuses on non-invasive checks you can do yourself and how to document symptoms clearly for a technician.
F34: LG OLED TV F34 Error Code Guide: Fast Fix & Repair Options
Error F34 suggests a fault that may ultimately require board or panel repair, but it can sometimes be triggered by borderline power or firmware conditions. Users might notice the TV becoming unstable, with random restarts or the code appearing after long viewing sessions. The guide covers ruling out simple causes, backing up settings, and understanding typical repair paths and costs if hardware work is needed.
F35: LG OLED TV F35 Error Code Guide (Real-World Fixes)
F35 is often associated with intermittent faults in the TV’s internal circuits, such as marginal components that only misbehave when the set is warm or under load. The symptom pattern may be inconsistent: the TV can work normally for a while, then suddenly throw F35 or shut down. Thorough observation of when the error appears, combined with standard reset and isolation steps, is vital before engaging a repair service.
F36: LG OLED TV Error F36 Fix Guide
LG OLED error F36 commonly appears after a restart, power loss, or software update when the TV’s self-test detects something unexpected. You might see it immediately after an update, or when trying to boot from a complete power-off. The full guide explains how to perform safe power drains, attempt system repairs, and recognise when repeated F36 errors indicate a deeper hardware issue.
F37: LG OLED TV Error F37 – Fast Fix Guide
F37 usually relates to signal, timing, or panel-drive mismatches, where the TV struggles to synchronise properly with incoming video or to drive the panel at the requested mode. Typical triggers include unusual resolutions or refresh rates from PCs or consoles, or rapid input switching. The article details supported formats, recommended settings, and when persistent F37 errors may point to failing drive electronics instead.
F38: LG OLED TV F38 Error Code – No-Nonsense Fix Guide
F38 is treated as a serious internal error, often causing the TV to shut down quickly to protect its electronics. In some cases the TV may not reach the home screen at all, or it may power off within seconds of turning on. Beyond basic isolation and reset procedures, continuing to force the set on is discouraged, and the guide stresses when to stop DIY efforts and contact LG or a qualified repair centre.
F39: LG OLED TV Error F39 – Quick Fix Guide
Error F39 generally indicates persistent communication problems between internal boards, such as the main board and panel or power modules. The TV might freeze, show artefacts, or shut down as soon as more demanding content is played. The full article walks through checking external sources first, then explains how technicians approach internal cabling, connector, and board-level inspections.
F40: LG OLED TV F40 Error Code Fix Guide
F40 is often associated with a critical hardware fault identified by the TV’s diagnostics, and is one of the codes most likely to require professional intervention. You may experience complete failure to start, repeated immediate shutdowns, or the inability to clear the code with standard resets. The guide helps you capture all relevant information, avoid actions that could worsen damage, and prepare for warranty or out-of-warranty service.
Maintenance Tips to Prevent LG OLED TV Error Codes
- Use a high-quality surge protector or uninterruptible power supply (UPS) to protect the TV from voltage spikes, brownouts, and brief outages that can trigger F-series power and protection errors.
- Ensure the TV has ample ventilation by keeping vents clear, avoiding enclosed cabinets without airflow, and not mounting the set directly above heat sources such as fireplaces or radiators.
- Keep your LG OLED TV’s firmware up to date using the built-in update tools, and avoid interrupting the set during updates to reduce the risk of software-related codes.
- Disconnect unused HDMI, USB, and other external devices when troubleshooting, and periodically inspect cables and connectors for damage or poor fit that can cause intermittent faults.
- Shut the TV down via the remote rather than pulling the plug, and wait several seconds between power cycles so internal circuits can stabilise.
- Use reasonable picture settings instead of running at maximum brightness for long periods, which can increase heat and stress on the panel and power circuitry.
- If you see recurring error codes, document the exact code, conditions, and any patterns, and contact LG support or a qualified technician rather than continuing to force the TV on.