good luck trying to fix the clash sounds
I have had several luke esb sabers apart tried to fix my self
if it is the lights ,no problem as you state it is most likely a solder conection
as far as the board goes ,if there is no sound (imho) there is no hope of fixing it
the biggest part of disassembly is drilling the rivets, there is no way around it. after that, take out the top screw then there is long knurl post (oval detail) that must be pulled.
both buttons must be carefully pryed off then there is a screw underneath.
you now have to remove the threaded sleeve and the battery sleeve
from the pommel end. carefully slide the blade through the back of the saber
now the electronics dissassembly........
do this simmilarly in that order........
I'll post pics sometime (I have said that for a few months now)
but really , I will