Last updated September 27, 2026.
Many TV symptoms come from an input, cable, setting, or source device. These checks can narrow the cause without opening the set.
1. The screen is blue, green, black, or says no signal
Make sure the connected device is on and the TV is set to the matching input. Reseat the cable, try another input, and test a known-good cable if possible. If the TV menu works, focus on the source device and connection before assuming the panel has failed.
2. Lines or odd colors appear on the screen
Check the TV menu or built-in picture test. If the defect appears there too, follow the manufacturer's restart and diagnostic steps for the exact model. If the menu looks normal, test a different source and cable.
3. The picture works but sound is missing
Check mute, volume, and audio output. A TV may be sending sound to Bluetooth headphones, a receiver, or a soundbar. Test the internal speakers and a second source before arranging service.
4. The remote does not work
Replace both batteries with new batteries of the same type and confirm their direction. For an infrared remote, a phone camera may show the transmitter flashing while a button is pressed. A visible flash means the remote is sending a signal; it does not prove that the TV itself has failed. LG's remote-control guide explains this test.
5. Movies look unnaturally smooth
Motion smoothing may be enabled. Look for a setting with a name such as motion interpolation, motion clarity, or smooth motion. Names vary by brand and model, so use the TV manual before changing advanced picture settings.
Do not open the TV
Stop and unplug the set if there is smoke, a burning smell, liquid exposure, a damaged cord, or unusual heat. Internal repair is not a safe household troubleshooting step because components can retain hazardous electrical energy.
For symptoms that remain after these checks, request a repair quote with the model number and a clear description of what happens.