I hope my English answer will be of use. As far as the LCD controller is concerned you can set it up to use 1-line of internal memory or 2-lines of internal memory. Virtually all LCD displays require the 2-line configuration. The first line of internal memory is used for rows 1 and 3 on the display and the second line of internal memory is used for rows 2 and 4 on the display. Follow the LCD Addressing
link at http://web.alfredstate.edu/weimandn
for a better explanation.
Unfortunately, if you do not use the lcd.begin statement the LiquidCrystal library defaults to initializing the display to use 1-line of internal memory. That is why nothing appears on rows 2 and 4 of your display.