The left side is an Intellitec 750 distribution panel for 120V (
Intellitec Service Manual) and the right side is the 12V fuse panel but I can't make out any name on it to know which one it is. Nothing in the service manual addresses the location of anything since that is determined by the builder o the coach. I would agree with Martian that the converter is located behind those panel if there is space for it. For both ease of construction and the expense of materials, it only makes sense that it is located behind those two distribution items.
I'm not so sure that I would think that the flickering lights are due to a bad converter. It is a pretty good indication of varying voltage on your 12V system and that could be caused by the converter but in my experience, it is more likely to be a battery problem. How old are your batteries, and who long has it been since you last serviced them?