To better help ascertain the root cause of a less than adequate picture quality on screen LG features a built-in Picture Test for its televisions. The test simply consists of determining, by process of elimination, whether TV or peripheral device connected to TV is at fault. It is not uncommon for a set-top-box to go on the brinks or for the wire connecting both devices to one another to break down as well.
Always check the condition of your HDMI cables being used with the TV. Some of the common issues brought about by defective HDMI cable include:
Poor picture quality such as lines across the screen, image breaking out in little square blocks (macroblocking), image ghosting, video artefacts, image or color abnormalities, etc., are often caused by the video source or a broken/damaged HDMI cable.
To access OLED CARE go to Settings > All Settings > General Settings > OLED CARE.
Within the OLED CARE is the Device Self Care. Which provides multiple features to optimize the TV’s condition.
Optimize your TV by cleaning up unused apps or unnecessary memory.
After running a test to verify that the image signal is output normally, you can select whether there is an error with the signal on the screen. If there are no problems in the test, check the connected external device or broadcast signal.
Start the Sound Test to check that the sound signal output is normal, and then select whether there is an error. If there are no problems in the test, check the connected external device or broadcast signal.
To access Self Diagnosis go to Settings > All Settings > Support > Screen Self-diagnosis. After running a test to verify whether the image signal output is being displayed normally, you can select whether there is an error with the signal on the screen.
If there are no problems in the test, check the connected external device, hookup cable connection or broadcast signal.
Settings > All Settings > Picture > Picture Test > Enter.
Take a close look at the picture shown on screen. Is the picture displayed clearly on the television screen… yes or no?
WebOS 5.0
[Prior to 2019] WebOS
➔ Try reconnecting the HDMI cable to the set-top box.
If you have determined the issue to be with the television, please Contact an LG Representative from the Customer Information Center to examine your options (warranty or not, cost of repair, nearest service center, etc.).
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