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That power supply is garbage, it needs to go in the trash, it's a fire hazard. There's a reason those resistors failed, it's a trash design.
- It uses diodes instead of a bridge rectifier, making it likely a half wave design.
- It has no X2 or Y capacitors (has positions for Y but no X2 caps on the PCB.)
- There's no input filter choke (despite having a position for it on the PCB.)
- The transistor and mosfet heatsinks are a joke, they're paper thin and won't properly cool anything.
- The output filtering is also a joke with a tiny combined toroidal choke that makes independent voltage rail regulation impossible in cross loading.
- It appears to use Teapo or some Chineseium junk capacitors, and far too few of them, making output regulation even worse.
Buy a quality power supply from a reputable manufacturer like EVGA, Corsair, Cooler Master, Antec or Thermaltake.
Your point about the bridge rectifier is wrong. Four diode makes for a FWBR.
A single component FWBR is just four diodes in a package for convenience and cost.
Four diodes does not automatically mean full wave rectification in SMPS.
View attachment 236210
In old SMPS designs without PFC, only two of the diodes are used as a voltage doubler circuit in 115v mode, meaning it's a half wave design. The PSU the OP has apparently runs at 230v, which would technically run in full wave mode, but it doesn't make it any less of a garbage design.
The only reason four diodes are used is because of cost cutting, it is in no way convenient to mount four individual components and have the extra traces and pads for them. It also means that you will get nowhere near the rated current of the supply. In 115v mode, common garbage designs like this only use 2 or 3 amp rated diodes, meaning a maximum current of 230W / 460W (115/230 for 2A) or 345W / 690W (115/230 for 3A) diodes. This stage alone already means the label of it being a "650W" PSU is a lie, because these diodes will fry long before you get even close to the rated wattage of the supply. PSUs like these are almost always in the 50-70% efficiency range, meaning at 650W, you'd be pulling 1.1kW+ from the primary.
But we already know this supply would explode long before that because of the paper thin heatsinks.
A 2w rated diode operating 50% of the time can safely handle 4a. So they could handle 460W/920W safely. A 3w diode would be safe up to 690W/1380W.