Is there anyone in this group and in the states familiar with replacing MOSFETs and willing to replace a few on my board? I am going to attempt to do it myself but I need a backup plan incase things do not go well…
Why has happened and which MOSFETs (etc) are the problem, or are you trying to increase the current for the MOSFETs (in which case it is better to externalise these or perhaps us SSRs for this purpose)
I burned up the fet on P2.4 using a regulator to drop the voltage to 12v for a high speed fan. I have a 24v PSU. I confirmed it’s shorted with a meter
Interesting, is that an early Smoothie board (or are you using a C3D) as the later revisions have a protection diode soldered to the board. Easiest way is to use a hot-air soldering iron with a very focussed nozzle to heat up the part and then to pull off with tweezers, then use solder braid and a soldering iron to remove (wick up) the solder from the pads and then hand solder in the new part. When you have removed the MOSFET, also check the protection diode, D7.
Also, get a 24V fan!!!
Yes it has the protection diode. How do I test the diode? Resistance? I found a high speed fan from dig-key that is 24v.
If you have a multimeter, the continuity tester function is usually marked with a diode symbol indicating it is also a diode test function too. Basically the test function should allow current one way and if you swap the probes around it won’t allow voltage to pass, does that make sense?
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It’s the diode test function
My multimeter does not have a diode test function. Just volts ohms and amps
Ok, measure the resistance ( ohms ) across the diode. One way should give you a low reading and the opposite way should give an extremely high or even off the scale reading.
I have a hot air station if you want them reflowed. I don’t have FETS on hand but if you send me a couple through digikey and the boards I’ll definitely replace them for you
@Griffin_Paquette Thanks for responding! The MOSFETs I ordered should arrive Monday. Ill remove the MOSFET tonight and post pictures here as I work through the process. Any and all feedback is welcomed. If things dont go well I will send you a PM. I am in Fort Mill SC.
Sounds good! I’ve done that size with a normal iron and they weren’t too much trouble. Let us know if you need any help/advice
Cut legs, clean pad, tack solder new one on.
Thanks guys! I found this in the troubleshooting sections - http://www.smoothieware.org/troubleshooting#i-burnt-one-of-my-mosfets...posting here for the next newbie! 
http://www.smoothieware.org/troubleshooting#i-burnt-one-of-my-mosfets
@Griffin_Paquette testing the diode shows that is is bad…I get same reading in both directions…compared to the reading of P2.6! Which is working! I do have some through hole diodes (Same used on my 5x smoothieboard). Can I install the through-hole diode on the P2.4 circuit? If I can should I remove the SMC diode on P2.4? Thanks in advance for the help!
Yes, remove D7 and immediately behind the X7 connector (where you have plugged the fan into) are two pins designed for a through hole diode. Check out http://smoothieware.org/spindle-mosfet-control?s[]=diode and more importantly here http://smoothieware.org/3d-printer-guide?s[]=diode#fans which shows you how to install the diode and its correct orientation.
Agreed with douglas.