Are you running that LCD in 8-wire or 4-wire mode?
Is the R/W line grounded?
BTW, these http://www.ebay.co.uk/itm/10pcs-I2C-Ser ... 2655363575
I2C back packs don't half make LCD programming easier.
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2012-18: 1B*5, 2B*2, B+, A+, Z, ZW, 3Bs*3, 3B+
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