Here is the bridge board that helped save my Dolphin tonight!!

http://www.rotordesign.com/s10/fusepcbproto.jpg

My Dolphin Main board is now officially working!! I figured out how to
rework the bridge circuitry with minimum trauma to the Dolphin PCB.
Now the bridge is located on the new prototype fuse board as seen in
the above link.

Can there even be better news? So I turn on the ignition key and
everything boots up. Stable and fine. So I decide to try plugging into
120vac for some charging. Everything boots up again and then
pppppffffssstttttttkkkkkssstt!!……pppppffffssstttttttkkkkkssstt!!

What was that? So After the 3rd verification that something was wrong
I turned off all of the lights and fired her up in pitch darkness. Ya
know how polished the aluminum Dolphin case is on the inside? It was
acting like a mirror and reflecting back to me some high frequency,
low amperage intermittent arcing from under the charger!!

So I guess the charger needs to come out. I’m wondering if this was
the demon that trashed my main board! I’ll find out soon.

Feeling like I’ve conquered a small army of gremlins, I tried to fire
up another board that had the same sort of damage. The board is
buzzing back at me when power is applied on the bench. All 4 of the
regulators and the chopper fet are working fine. The pwm to the
chopper fet is clean and pretty. Not sure where the buzzing is coming
from but it’s keeping the board from talking to the laptop.

I’m not much of a drinker and it’s time for a beer!

1 down, 3 to go.