Screen Issues
If you experience any of the problems below while using the product, please check the following. There may not be a problem with the product.
First of all, perform a HOME Setting icon All Settings icon Picture Picture Test for check any abnormalities in the TV.
If you are using a set-top box, turn it off, and then turn it back on.
Make sure that the set-top box is correctly connected to your TV.

It says there is no signal on the screen.
  Check whether the coaxial cable or the cable connected to the external device is properly connected to the TV.
  Go to HOME Input button to choose the connected input.
  Check if your external device, such as set-top box or Blu-ray player, is turned on.

I cannot see some channels.
  Start the HOME Setting icon All Settings icon Channels Channel Tuning Auto Tuning.
  If you are using a set-top box, consult its supplier.

The screen shakes after the momentary appearance of vertical / horizontal lines and net pattern.
  Connect wireless telephones, hairdryers, electrical drills, etc. to a different power outlet. The problem may be caused by high-frequency electronic devices such as another TV or strong electro-magnetic sources nearby.

A digitally broadcasted program stops or its screen is broken.
  This happens when a signal is weak or reception is unstable. Adjust the antenna direction or check the cable connection.
  HOME Setting icon All Settings icon Channels Channel Tuning Manual Tuning
  If the signal strength is too low in Manual Tuning, contact the broadcasting station or management office to have the signals checked.
  If you are using a set-top box, consult its supplier.

I see vertical lines in all four edges of the screen, or the colors are blurred when I try to connect to HDMI.
  HOME Setting icon All Settings icon Picture Aspect Ratio Settings Just Scan
  Set Just Scan to Off.
  Just Scan shows you the original image as it is. You may see noise in all four directions on the screen if the signal contains noise.

I don’t see anything, or the image keeps flickering when I try to connect the HDMI cable.
  Check whether your HDMI® cable is compliant with the specifications. You may experience flickering or a blank screen if the HDMI® cable is faulty (bent, broken).
  Make sure that the cable is correctly connected to the port. Bad or loose contact may cause display problems on the screen.
  If using a UHD set-top box, adjust HOME Setting icon All Settings icon Picture Additional Settings HDMI ULTRA HD Deep Color.

The screen looks too dim or dark.
  HOME Setting icon All Settings icon Picture Picture Mode Settings Picture Mode
  Switch Picture Mode to your desired picture mode. (Standard, Vivid, etc.)
  This applies to the current input mode only.
  HOME Setting icon All Settings icon Picture Picture Mode Settings Picture Options Motion Eye Care
  Switch Motion Eye Care to Off. This applies to the current input mode only.
  HOME Setting icon All Settings icon Picture Energy Saving
  Switch Energy Saving to either Off or Minimum.
  HOME Setting icon All Settings icon Picture Additional Settings Eye Comfort Mode
  Switch Eye Comfort Mode to Off.

The screen is in black and white or displaying strange colors.
  Check the input mode or cable connection.
  Go to HOME Input button to choose the connected input.
  You may get a black and white screen if you have connected to the COMPONENT IN but selected the AV.
  Go to HOME Input button and choose Component.
  When you are connecting to the AV IN or COMPONENT IN, check to ensure each cable is matched with the corresponding color connection. For component cables, make sure the video (red) cable and audio (red) cable are connected properly.
  AV IN / COMPONENT IN ports are available in certain models only.

Information on customer service for product problems is available in HOME Setting icon All Settings icon General About This TV on the TV.