the little black things are resistors. you'll need a good magnifying glass or jewelers loop to see what the numbers are/were. hopefully they were right at the breakage but they probably were and are now unreadable. the next thing to do is see what pin of the decoder chip the broken resistor went to. if it was a data line (for the columns or rows) then read a resistor from another of the same type of line (column for column, row for row) and replace it with a resistor with that same number. In this case, close won't be good enough. it has to be exact.
if you don't have a resistor then try a computer repair shop. they sometimes throw out bad mother boards and I use those boards all the time for scavenging for parts. especially the header pins.