Reviews - Seasonic X-400 Fanless 400W
Sample Provided by: (By OklahomaWolf on Mon, Sep-13-2010)

Page 4 - Disassembly

For a change, I'm not going to grace you all with a fan shot, but with this here view of the power supply open to the winds. Wait - the winds are too strong... let me turn off the desk fan.

Here's the modular connector board with the rear cover removed. As you can see, there is room for several connectors that weren't installed.

The underside of the main PCB. See those four MOSFETs in the middle? Those are for the 12V output and are heatsinked both to the case and to heatsinks on the other side of the PCB. They are IPD036N04L parts. The other gray pads you see are other thermal conduction pads for other hot and spicy parts of the unit. Wait a minute... what's going on above that one on the right? Let me zoom in here.

Hello, solder blobs. Now, to be fair, this is a complicated design. Complicated designs are always harder to put together. All the same, I asked Seasonic about this. They're going to get right on top of the issue. Not that this is a big deal - most of the other soldering in the unit is excellent.

Transient filter starts with a line filter on the back of the unit.

Remember when I said most of the other soldering is excellent? Yeah... there are other exceptions. This is on the VRM PCB, where the 12V supply comes in for the VRM. Two other wires, both grounds, also had this problem. One side of the PCB got hot enough to solder down properly, one side did not. Yes, I asked Seasonic about this too. They are getting on this one too, even though this isn't too big of a problem either. Why not? Well, take a look at this next picture.

This is the backside of the VRM, at the same 12V joint. As you can see, on this side the joint is flawless. It's just on the other side that there is an issue. Seasonic is going to drill these holes just a bit larger in the future so that the solder can get through properly and form as solid a connection as anyone could hope for. In the meantime, let me just say this - as long as one side is soldered down properly, there is no problem. This VRM is only rated to put out a hundred watts total. This connection is not going to be stressed. But all the same, I'm going to break out the iron and finish soldering up my review sample. I've already got it apart - why not?

In this shot, you can see the tall metal heatsinks that serve to conduct heat away from the PCB area underneath which the 12V parts are mounted.

This is the PFC section. A diode and three 20N60C3's. Main switchers are IPP60R190C6 parts, run by a CM6901 controller.

More transient filter can be found at bottom center. Two coils, a MOV, two Y capacitors, and one X capacitor. Bridge rectifiers are a pair of 15A parts.

Speaking of capacitors, there's room for a second primary cap. All polymer and electrolytic capacitors in the unit are Nippon Chemi-Con.

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