Press the ASPECT button
RGB IN, COMPONENT VIDEO
(HDTV signals : 1125i (1035i/1080i), 750p)
VIDEO IN, S-VIDEO IN, COMPONENT VIDEO
(Non-HDTV signals : 525i, 525p,625i)
4:3 16:9 SMALL
That explains how to change the "aspect" or shape of the image, ie:, square, 4:3 or letterbox image, 16:9 when sending the unit different input signal sources. It may accept a 1080i signal, but it will only display that 1080i signal to the highest resolution it's capable of, which is 800x600. No matter how you connect the signal sources, rgb, etc., the projector can only produce the highest resolution it was designed for.