After months of declining business he told me privately that the reason for his behavior was because he was burned out but felt everything could be fixed in 6 months. I didn't stay to find out and quit immediately. 6 months later those who remained ended up working 3 months without pay and found themselves out of a job while the CEO declared bankruptcy. Towards the end I heard he got more erratic and started blaming the employees, the board and everyone but himself for his situation.
It still baffles me how someone who seemed like he could turn anything to gold and had such good judgement could suddenly lose everything and become so hopeless because of burnout. Over a year later he still hasn't recovered and is being sued by several people.
Since you're an engineer - I'd say tell the board (verbally) what you think and put in a notice of resignation. If they change things for the better they might ask you to reconsider your resignation. If they take offense and side with the CEO - you're better off quitting anyway.
Does "the board is stakeholders of our service" mean your "startup like thing" was sort of acquired? As in, are you owned/controlled by other companies that use your product/service? If so, then they might not care what the CEO's vision is. They might be thinking of y'all as just a subsidiary beholden to their bottom line, not your own. They might not even be particularly interested in seeing the value of their equity increase.
I believe there's no such thing as a team without a leader. If you lose your leader you don't have a team anymore. It isn't really possible for a committee to serve as a leader. So if you want to preserve your team you need to either get your existing leader back into the right head space or get a new leader (basically what jacquesm said). Maybe ask your team which they prefer. If consensus is to fix the current CEO then schedule an intervention. if consensus is to get a new CEO then ask them to step down or go to the board.
If y'all want to try to help your current CEO you might reach out to other CEOs who have had a hard time dealing with an overreaching board. Maybe she just needs to talk to someone who's been there before.
It could also speed up the dissolution process though. You might get fired on the spot also but if things go as you describe there is probably tough times ahead.
Walking out is the easiest (work wise) option, not easy either (personally wise). Keep in mind that, in a way, "it's just a job" so don't let it eat you either. It doesn't cost much to keep some lines open and stay in contact with different companies and leaders...
I like your ideas of an intervention, and reaching out to a CEO that has experienced this kind of situation.
Jason Selk has written about a similar situation in his book, Executive Toughness. Essentially, if the CEO can control her emotions, she can control her performance-- and by extension, the effectiveness of the team.
It might be enough to pass along a copy of the book with an encouraging note > http://www.goodreads.com/book/show/13054842-executive-toughn...
Ultimately, you may have little influence on the dysfunctional relationship dynamics between the CEO & The Board.
Keep in mind that if things go pear shaped it is her head on the block, not the board, and she should act accordingly.
If you have less than a point or two of equity, it ain't your problem.
Oh, and maybe keep an eye out for new jobs.
As you move on, do so by not burning bridges and leave on a good note. Don't make it your mission to point out the obvious.