Symptoms
- Screen brightness pulses or flashes
- Flickering worsens with certain content or brightness
- Flickering happens on all inputs
- Screen briefly goes black then returns
Likely causes
- CommonLoose HDMI or power cableA partially seated cable can cause an intermittent signal that looks like flicker.
- CommonFailing power supply boardAging capacitors in the power board are a classic cause of flicker that worsens over weeks.
- PossibleBacklight dimming/driver issueLED driver problems can cause pulsing brightness rather than a steady image.
- PossibleIncompatible refresh rate or HDR setting from sourceSome source devices send a signal the TV briefly can't lock onto, causing flicker only on that input.
What to do
- Unplug the TV from the wall for two minutes, then plug it directly into a different outlet.
- Reseat every HDMI and power cable firmly at both ends.
- Check if flickering happens on every input, including a channel with no source connected.
- Lower the source device's resolution or turn off HDR to see if a specific signal is triggering it.
- Turn off local dimming or motion smoothing features in the picture settings menu.
- Note whether flicker gets worse as the TV warms up over 20–30 minutes, which points to a power supply issue.
- If flicker persists on every input and setting, plan for a technician visit.
Tools and parts
TV power supply boardSearch: “TV power supply board replacement for model”
When to call a pro
If flicker persists across all inputs and after a cable/outlet swap, have a technician test the power supply board.
Safety
Use caution
Never open the TV case while it's plugged in; power supply capacitors can hold a dangerous charge.