Got 18v @ the cap for br3 and holds 18v all the way to the dmd. Don't I need 24v at the dmd?

No - 18volts on mine




was able to get some readings and photos so check wire placement just in case

photo 1 - BW display plugs
lhs plug is the dmd board which is a 5 volt supply
rhs plug is the dmd - red and black with red strip is 5 volt, black and blue is 18volt

photo 2 - BW Display lead
is the lead coming from the display rhs plug (note one wire changes colour - blue becomes a purple)

photo 3 - BW Display lead to BR3
other side of plug from photo 2, note the purple change

Note both black and black with red stripe are earths

photo 4 - BW BR3 and capacitor ?
a red and black from the display through the lead goes to the power supply board
a purple and black from the display through the leads goes to the BR3 and then another set of wires the same colour from the same connections go to the rhs blue capacitor - which measures 18volts