I appear to have blown something on the MK133 quiz table when I accidentally tried to connect a battery the wrong way round when the switch was in the On position - the board is now completely dead.
I am assuming I have blown one of the components close to where the power wires join the board - I suspect it’s one of the diodes or transistors. Before I try unsoldering the components one by one to test them, can anyone suggest which one might have blown?