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C912 is likely some sort of "snubber cap" for the primary of the SMT transformer.. Somehow I missed seeing that. R912 is on the supply line to the chip...if it was open...you would NOT see 171 volts on the chip...but check the connections anyway..
And YES...IF that cap is not connected...the PS may NOT run at ALL.
Not sure EXACTLY what the voltage on the hot-side of the opto should be.... withoust seing a manual...BUT it WILL NOT be high...likely 12 volts or LESS...on BOTH pins..
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