I have a samsung 650R. Eventhough I rotated the contrast dial to light, the LCD screen is still too dark. What could be the problem? The LCD is still readable at an angle, but not straight on. If you look at it straight ahead, it's too dark.

P Patel, March 2010

If you can't adjust it with the contrast control, it probably has a faulty LCD display unit. I have seen a couple fail in the past. You would need to take it to a dealer for testing.
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If anyone is looking for a Samsung / Sam4s ER-650 manual:

http://the-checkout-tech.com/manuals2/cashregisters/samsung1.php

Mark, March 2010