LG CineBeam 4K Owner's Manual page 138

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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.
The screen looks too dim or dark.
• (Q. Settings)
Mode]
Switch [Picture Mode] to your desired picture mode. ([Standard], [Vivid], etc.)
This applies to the current input mode only.
• (Q. Settings)
Switch [Energy Saving] to [Minimum].
The screen is in black and white or displaying strange Colours.
• Check the input mode or cable connection.
• Go to to choose the connected input.
[Picture] [Picture Mode Settings]
[Picture] [Energy Saving]
[Picture