LG 55CT5WJ Owner's Manual page 28

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Issues Related to Screen (Colour)
• Screen has poor colour resolution (16 colours).
- Use PC settings to set the colour to 24 bits (True Colour) or above.
• Screen colour is unstable or mono-coloured.
- Check the connection status of the signal cable. Or, re-insert the PC graphics card.
• Black spots or bright spots appear on the screen.
- Some pixels (red, green, blue, black) are visible on the screen due to the unique characteristics of the display panel.
This is not a malfunction of the product.
• The screen's brightness seems dark.
- Adjust brightness and contrast again.
- Backlight may need repair.
Issues Related to Sound
• There is no sound output.
- See if the audio cable is connected properly.
- Adjust the volume of the product or external device.
- See if the sound is set properly.
• Sound is too dull.
- Select the appropriate equalizer sound.
• Sound is too low.
- Adjust the volume of the product or external device.
• For some models, you will need to purchase external speakers separately since they do not have speakers built-in.
Other Issues
• The power suddenly turned off.
- Check if the auto-off function is activated on the settings related time.
- Power source has not being supplied properly. See if the product power cord is connected properly.
- Check the power control settings.