How to Troubleshoot & Replace Ge AP3792739 / WB27T10551 Main Power Brd

I searched the net with my GE Trivection oven model # JS998SK3SS and symptoms and found this thread. http://www.applianceblog.com/mainforums/threads/37269-Profile-Oven-display-is-blank-and-oven-light-does-not-come-on Even though their oven was a different model # than my oven the part they replaced that made it work again was the same as mine. I didn't have the ability to do all the testing they did but the symptoms were exactly the same. so without delay i ordered the part from APP received it in 2 days installed it in about an hour and boom, my oven works again. The part is pretty expensive but so was this oven, so i bit the bullet and got it up and running. 

After typing with a tech from your company, they suggested that I purchase the panel control board, which I did. After plugging in and not making a difference. I returned, which is why I purchased from AppliancePartsPro. Your company is the only one that allowed me to return a part that wasn't needed. Continued to do more research and after reading a blog I tested main power board and found that to be the issue. Ordered board from AppliancePartsPro, installed and oven works perfectly. Thanks AppliancePartsPro 

A friend and I took the unit out of the wall started to troubleshoot and look for obvious signs on the circuit boards I knew I had voltage coming into the unit but could not get the display to come on or the lights in the upper oven the lower oven did have lights inside. So after inspecting all the connections checking voltage we traced it to the power board and I noticed a small electronic component that was screwed on to one of the large heat sinks was cracked and a piece of the plastic laying on the circuit board. That's when I called appliance parts in order a new power board it took about 3 days I installed it tested it everything is working again and I'm back in business now they learn to cook... thank you appliance parts pros for having the part of ailable and even though I think is expensive it was reasonable.