your +5 volt rail is low even with out the dmd connected "+5v = 4.83 v"
It could that the large transistor on the heat sink is faulty or a faulty capacitor on the power supply.

the +5 volts gets its supply from the +12 volts so i doubt its the bridge.

there is one more test you can try. with the dmd and controller connected
Black lead to gnd
Red lead to the left side of R6 (the big white resistor under the heat sink)
Then Red lead to the right side of R6

if both tests show 0.** volts then the fault is in the power supply
if one test shows +5v and the other shows 0.** volts then the fault is on the dmd driver board

But going back to what i said at the top of this post 4.83V is to low at the power supply so you need to sort that out