italian job dot matrix stopped working

[leaky90]

hi there

i have an italian job fruit machine was working fine brought it out of storage today

plugged it in working fine but i disconnected the speaker before putting into storage because of the noise and the new born

opened it up to re connect the speaker and all of a sudden the dot matrix display has gone it was working fine before i opened the cabinet

i have tried restarting the machine

disconnecting the wires both on the board and the matrix but still no joy

any ideas many thanks sam