Very seriously doubt if the primary side large 820ufd @250Vdc caps will cause you any grief. They should be rated 200Vdc or higher since the peak value of the 120Vac RMS voltage is what is applied to them which is typically 170Vdc.
Many of the units have 450Vdc rating to accompany the 240Vac market.
I have had well over a hundred converters apart for repairs and only found the primary side filter caps bad in less than 5 units. They are used in a simple filtration application where ESR is of limited concern.
Suggest you get your ESR/Cap Value meter out and test the 10ufd and 22ufd caps in the feedback loop of the switching circuit they are the typical failure items.
