[SOLVED] SMD FET soldering issue

[Cval]

I am trying to solder a SMD FET to my PCB, this is a different fet than the PCB was originally designed for (Drain and Source switched places). When i solder it up like this the R1 on my PCB ignites. Is there a reason you cant solder SMD FETs like this?

I also tried to solder the through hole version of the original FET to the board and the same thing happened...

 

[barry]

You are obviously connecting something wrong. With no schematic, I can't tell you anything else. HOW ARE WE SUPPOSED TO KNOW WHAT R1 IS??????

 

[Cval]

I didn't think it had anything to do with the layout, i figured it had more to do with the way I soldered the SMD FET. The source, gate, and drain are all in the correct positions. Attached is the schematic.



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And here's the fet layout, I am attempting to connect the "new" fet in the "old" fet pad layout.

 

[FvM]

Do you mind to mention the MOSFET type? The switched pins thing sounds really unlikely.

 

[barry]

How about some values? Voltages? What's connected to the connector? You are making this extremely difficult.