If your LG TV screen starts flickering, blinking, or going dim unexpectedly, it can turn movie night into a frustrating experience. Whether it’s a subtle brightness shift or full-on flashing, flickering is usually a sign of a deeper issue—but most of the time, it’s fixable.
At Gary’s Computer Repair Service, we help customers across Ireland resolve screen and hardware issues daily. Here’s what might be going wrong with your LG television, and what you can do next.
🔍 Common Causes of LG TV Screen Flickering
1. Loose HDMI or Power Cables
Symptom: Intermittent flickers or screen blanks out for a second
- Why it happens: Poor contact or bent pins can disrupt video signals.
- Fix: Re-seat HDMI, power, and antenna cables. Try replacing with new cables if the issue persists.
2. Energy Saving or Picture Mode Settings
Symptom: Brightness seems to pulse or shift unexpectedly
- Why it happens: LG’s Energy Saving or Auto Brightness features can cause flickering in changing lighting conditions.
- Fix:
- Go to Settings > All Settings > Picture > Energy Saving and turn it off
- Change Picture Mode to Standard or Cinema to test
3. Software Bugs or Outdated Firmware
Symptom: Flickering appears after a recent update or app crash
- Why it happens: Firmware glitches or outdated OS versions can affect screen behavior.
- Fix:
- Go to Settings > Support > Software Update and ensure your TV is up to date
- Try a factory reset if the issue began after a specific update
4. Backlight or Panel Malfunction
Symptom: Flickering gets worse with brightness increase or after warm-up
- Why it happens: Worn-out backlights, failing LED strips, or inverter issues can cause screen pulsing or blinking.
- Fix: This requires professional inspection and repair—particularly for older models or heavy-use TVs.
5. External Devices Causing Signal Conflicts
Symptom: Flickering only happens with a specific HDMI device (e.g. PlayStation, Fire Stick)
- Why it happens: Signal mismatches, HDCP handshake errors, or refresh rate conflicts.
- Fix:
- Try the device on a different HDMI port
- Adjust the output resolution from the source device
- Update firmware for the external device (e.g. Fire Stick OS)
🛠️ When to Try a Factory Reset
If you’ve ruled out cable issues and energy-saving settings, and the flicker still happens on all inputs, try resetting your TV:
Go to:
Settings > All Settings > General > Reset to Initial Settings
(Note: This will erase personal settings and installed apps.)
⚠️ When to Call a Professional
If the flickering:
- Happens even without HDMI devices connected
- Is accompanied by lines, ghosting, or color distortion
- Gets worse over time or after the TV heats up
…then you’re likely dealing with hardware failure. This could be:
- A damaged T-con board
- Malfunctioning LED backlights
- Faulty mainboard or power supply unit
In these cases, DIY fixes aren’t recommended, and it’s time to bring it in for a professional diagnosis.
💡 LG Flickering Issues We’ve Fixed Recently
At Gary’s Computer Repair Service, we’ve handled:
- 43″ LG TVs with flickering from worn-out LED strips
- LG OLEDs with dimming flickers caused by auto-brightness sensors
- HDMI handshake issues with Apple TV and Xbox
- Power supply board replacements on LG Smart TVs over 3 years old
We offer in-shop and on-site TV diagnosis, quick turnarounds, and honest repair advice—no fix, no fee.
đź“ž Ready to Fix Your LG TV?
Flickering screens are annoying—and often preventable. If your TV is underperforming or flashing, let us take a look before it gets worse.
âś… Free diagnosis available for local drop-ins
âś… Fast turnaround on common LG TV issues
âś… Serving Dublin, Galway, Limerick, Cork & surrounding areas
📞 Call Gary’s Computer Repair Service Today
📧 Or book an appointment online to get back to flicker-free viewing!