Fixes for the most common LG 50" UR640S UHD Signage TV problems, from the quickest checks to when to contact LG. Start at the top: most issues are a setting, a cable or firmware.
Quick checks
- Restart the device: unplug power for 30 seconds, then reconnect.
- Reconnect the cables, using the ones that came in the box.
- Update the firmware. How
No signal or wrong input
- Select the input the video bar or PC is connected to.
- Reseat the HDMI cable at both ends and try a certified high-speed cable; long runs may need an active cable or extender.
- Make sure the source is awake and outputting a resolution the display supports.
- Disable HDMI-CEC on one end if the display keeps switching inputs or turning off.
Won't turn on or status light is red/blinking
- Check the power adapter is the original one and firmly connected, and try another outlet.
- Unplug for 30 seconds and power it back on.
- Check the status light meaning in the user guide; a blinking light during startup or updates is often normal.
- If it never finishes starting, contact the manufacturer's support for a recovery.
When to contact LG
If none of this works, the device may need warranty service (LG warranty: 3-year). Bought from us? Contact us and we'll help with the claim.
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