Hi Coulomb, thanks for the reply .
I have 2 different models of inverter the 4kv with cooling fins on top (old model i think ) and 5kv i brought on the real cheap that blew up at a work place many year ago (smaller newer model).
It appears only the SCC is different between them , (firmware and extra mosfets aside that is,... i guess ) the 5kva is the scrapper for parts as it is corroded away it sections . i have no history of the 4kv given to me dead . many smd parts were shorted / suspect so i am in the process of ordering new components ( pwm controllers ect) im going in deep this thing won't beat me just yet.
I have no boot (lights, lcd ,beeps at all ) SMPS 'ish area is my guess .
Just trying to get my head around the inner workings .
cheers.