LG RL-JT10 Owner's Manual page 21

Do not obstruct the vents of the projector. It may cause overheating.
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Turn off the projector or switch the projector to standby mode to connect the AV box.
The LCD projector is manufactured using high-precision technology.
You may, however, see tiny black or coloured dots continuously appear on the LCD
projector image. This is a normal result of the manufacturing process and does not
indicate a malfunction.
To receive D-TV programmes, it is necessary to purchase a D-TV receiver (Set-Top Box) and
connect it to the projector.
If there is no input signal, the Menu will not display on screen.
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