3/17/2024 0 Comments Dell 2405fpw monitor driver![]() As soon as the 0.22Ohm resistor is blown, the gate of the FET is connected to the unloaded full-wave rectified mains input. The 0.22Ohm resistor is a fusible resistor (which doubles as low-side current shunt), which blows and opens the circuit to, err, not really prevent any damage. The MOSFET fails by shorting all terminals, thus shorting the primary side. If the capacitor is suddenly disconnected from the circuit, the PFC coil discharges into, well, there is nothing to discharge into, so it kills the primary switching mosfet. The supply has PFC, which is a step-up converter outputting 400V into that cap. ![]() The failure mode is that the primary cap goes bad (leaking electrolyte etches one of the connections away).
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