Black boxes on the first row | Microcontroller › 8051 › black boxes on 16×2 LCD › Black boxes on the first row November 11, 2012 at 5:48 am #8734 AJISH ALFREDParticipant Black boxes on the first row means “LCD not initialized”. Only after proper initialization an LCD can display characters. Problem could be either hardware or software. First check your circuit connections and then your code. If possible post your connection diagram here.
