LG ProBeam BU70QGA 7000-Lumen 4K Laser SmProjector - Manual (Page 137)

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Troubleshooting Screen Issues
Please check the list below when you experience the following symptoms during use of the product. It may not be a
failure.
It says there is no signal on the screen.
• Check if the cable connected to the external device is properly connected to the projector.
• Go to INPUT button to choose the connected input.
• The signal from the PC (Graphics card) is out of the vertical or horizontal frequency range of the product. Adjust the
frequency range by referring to the specifications in this manual.
Part of the projected image is cut out.
• Check if the graphics card resolution and frequency are supported by the product. If the frequency exceeds the
supported range, use PC settings to set the resolution to the recommended value.
The screen shakes after the momentary appearance of vertical/horizontal lines and net pattern.
• Use a different wall outlet than where you plug wireless telephones, hairdryers, electrical drills etc. The problem is
caused by high-frequency electronic devices such as another projector or strong electromagnetic sources.
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.
• Turn off the Deep Color function for each input (HDMI1, HDMI2, DISPLAYPORT) at [Display]
[Advanced Setting] [UHD Deep Color].
The screen looks too dim or dark.
• Change to the desired video mode at [Display] [Picture Mode].
• Change the brightness to Minimum Energy-Saving at [Display] [Advanced Setting] [Energy
Saving].
The screen is in black and white or displaying strange colors.
• Check the input mode or cable connection.
• Go to INPUT button to choose the connected input.