Pictures of the top side of the board? Did you replace the MOSFET? It looks like it has been repaired by someone else before.
What DC voltage do you get on each pin of the IC using the negative leg of the main filter cap as the primary circuit ground ref. point.
3R3 is referring to the SMD resistor with 3R3 printed on top.
"Which check with 3R3 i had to do?" measure the resistance between its two legs. I am not sure what the function of that resistor in the circuit yet.
Did you check the ESR of the start up cap C054?
Did you also check the resistance on the DC output cable to make sure the output is not shorted out?
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