Impossible to say without knowing a lot more detail.
It looks like a simple SMPS and I'm guessing the cap and resistor are in series and are across a high speed rectifier diode which feeds into an electrolytic cap, So a simple half wave rectifier type supply.
Given the frequency will be very high the cap is likely to be a lot less than 100nF, perhaps something like 2nF. The voltage rating depends on the output voltage and if the configuration is as I describe then the cap needs to be around 3 times the rail voltage to give a safety margin.
It looks like a simple SMPS and I'm guessing the cap and resistor are in series and are across a high speed rectifier diode which feeds into an electrolytic cap, So a simple half wave rectifier type supply.
Given the frequency will be very high the cap is likely to be a lot less than 100nF, perhaps something like 2nF. The voltage rating depends on the output voltage and if the configuration is as I describe then the cap needs to be around 3 times the rail voltage to give a safety margin.
Yes you are right Molly upper side is the diode and output cap.Thank you for answer I try the 2-3 nf cap and see what happen.