LETARTARE:
********************* by GOOGLE ****************************
With the library DFRobot v1.1 your code:LiquidCrystal_I2C LCD (lcdAdrr, 2,1,0,4,5,6,7, 3 POSITIVE)work properly.
That constructor is for fm's library not the DFRrobot library:
https://bitbucket.org/fmalpartida/new-liquidcrystal/downloads
--- bill