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
thanks for the guide, I did the test with the following results:
no plugs to the dmd - white resistor
lhs = 4.83v , rhs = 5.05v
with just the dmd lead in - white resistor
lhs = 0.39v , rhs = 0.55v
with just the dmd board lead in - white resistor
lhs = 0.06v , rhs = 0.19v
with both dmd & dmd board leads in - white resistor
lhs = 0.06v , rhs = 0.18v
so based on that it looks like a power supply issue
does that mean the power board ????
