Hi Adrian4, for what you describe it is feasible that it is the capacitor, usually of 470 uF x 400 v. Following the circuit is at the exit of the diode bridge. I uploaded a photo of the board to be able to guide you better
Sorry for the delay, I do not see any image I thought it was something because I was seeing it on the mobile but on the PC I can not see it either. It may be those of 220Uf / 400V, these should be connected to the 4-diode bridge and this diode bridge to the voltage input pins of the mains (220VAC or 110VAC)