Magic smoke released here (on attached image), or just dust? What voltage do you measure at these bulk input caps? For the SOT23-6 IC on the primary side (IC9101), can you get a datasheet on it? If so, measure VDD/VCC and see if it's within the specified limits (probably around 9-16v if I were to guess). Also measure the voltages on those SMD caps on the primary side and see whether any are shorted or 0v. Based on the blown primary side FET (but it not blowing after replacement), I do wonder whether the faulty component has now gone open-circuit.
This is a pretty simply power supply with only a single optocoupler and everything on the PCB labelled. I think it should be fixable.