LG CineBeam HU70LS.AEU Owner's Manual page 137

Screen Problems
First of all, perform a
for any abnormalities in the projector.
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 projector.
It says there is no signal on the screen.
• Make sure that the HDMI® cable is correctly connected to your projector.
• Go to to choose the connected input.
• Check if your external device, such as set-top box or Blu-ray player, is turned on.
The screen shakes after the momentary appearance of vertical/horizontal lines
and net pattern.
• Stop using items such as wireless telephones, hairdryers, electrical drills etc.
The problem is caused by high-frequency electronic devices such as another
projector or strong electromagnetic sources.
I see vertical lines in all four directions on the screen, or Colours are blurred
when I try to connect to HDMI.
• (Q. Settings)
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.
(Q. Settings)
[Picture] [Aspect Ratio Settings]
[Picture] [Picture Test] to check
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[Just Scan]