Measure for DC voltage from a DC common point or ground plane on the board to the drain side of the Mosfet or from Source to Drain and measure the power DC, it will be somewhere common to the terminals on the large capacitor.
Ok, it did cost $13 but it sounds like you got way more than $13 in satisfaction out of thus project! Thanks for keeping that heap out of the landfill!**** UPDATE - PROBLEM SOLVED ****
Thanks again guys. The treadmill works like new (knock on wood). Just gotta lube it now, so it's still on hold until tomorrow. And get a heavy duty extension cord just in case (was using a middle duty).
So my friend checked the board again and could not find anything on the outside using the multimeter. We suspected some burned chip which would basically be the end of it (plan B would have kicked in - the motor operated on a dimmer switch). Then he remembered something that he did to the board when soldering my transistor. He thought there was some small "jumper" at the bottom of the board that looked suspicious to him and which supposedly broke off when he was working on the transistor. So he got one from another board and soldered it back on (looked like a tiny resistor). I don't know where he got that whole idea from (maybe he was just drunk LOL) but that's what was screwing it all up! He cut it off, I reinstalled the board.... and the motor powers on like new. Everything works fine. WHEW....
So, in case you're like me and you like to get to the bottom of issues to understand the root cause... I think in my case, the diode broke off due to the constant impacts and vibrations which then blew the transistor. The 15AMP 250V fuse saved all the electronics and the motor (nice design!). The diode was salvageable but the transistor (JUST LIKE YOU GUYS SAID) was not. So it was potentially a $4 repair... something that "a certified professional" would have charged me $200 for or $200 (labour) + $200 (for a new board?). Insanity... It cost me $13 because of the shipping charge.
Thanks again. You guys rock and you've saved me a tonne of cash and stress. This was the first purchase of my 13 and 11 yr olds for their own money, it'd be a shame to have to ditch it over a $4 transistor. I've never owned a treadmill before or done anything with any electronics (I'm more on the software side). Now I just have to lube the belt and hope it lasts my kids for a few years. MANY thanks.
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by Jake Hertz
by Luke James