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I’ll need to use hot air. What temp?
I say start 330C and work up. 4 layer is a pain to solder. Be careful with any connectors near it.
It was brutal!!! My board has a few scars and I lost an LED but I think everything is okay. The FETs were easy. But I didn’t give the diode enough thought and forgot to trim the leads causing cold joints etc. Any I got it on.missing/deleted image from Google+
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Suggest you resolder the Diode, and check for shorts etc before you power up the board.
Prilimary power test was successful. I’ll add the fets Monday and test again. Fingers crossed!!!
Good to hear 
Well looks like I ruined a perfect new 4x…this is really depressing! both mosfets fail the diode test…the VBB led actually comes on! (barely). Heres my solder job…feedback welcomed! Gotta figure out what do do next…
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Can you highlight the components you added and can you take a photo sideways showing the orientation of the diode you added behind the green connector
Is the through hole diode the correct orientation so the white band is closest to the “+” on the connector?
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They look OK, if you put a multimeter set across the terminals (green ones) who happens when you turn the MOSFET ON/OFF via g-code commands? (does it go from 0V to 24V and back to 0V?
Also, did you use the MOSFETs per the Smoothie BOM, which Diodes did you use?
I tested each fet with my meter. Source and drain stay connected. I cannot get the gate to open/close. Meter shows 24v as soon as I turn on the PSU… I ordered from the BOM. I will post a picture of my digikey invoice
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The bright red trace shows the pin P2.4 is available at, that should nominally be LOW so the FET is off, can you check that, also note the two red pads which route this via R73 (22R) to the Gate, can you check both sides of that resistor and make sure it is not shorted to a nearby trace, same with R74 (10k) which holds the Gate low (to GND). You should be able to use a 1k resistor and short that pin to 3V3 and the MOSFET should turn on (1k to limit the current).
(Yep the MOSFET part looks correct)
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