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Old 08-20-2018, 03:09 PM   #15
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Join Date: Sep 2008
City & State: NL
My Country: Canada
Line Voltage: 120VAC 60 HZ
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Posts: 438
Default Re: Treadmill DC Circuit no motor start

Originally Posted by R_J View Post
When I look at the ic I see these marks, If the ic got hot due to being shorted internally it can discolor the top.
Does the ic get hot? you could post the voltages of that ic's pins, That may or may not help.
The speed control does seem to connect to that ic so it would have something to due with the speed control, and if it is bad, speed could either be full on or full off depending on how it failed
The IC don't get hot and here are the voltages with one probe on ground starting at the dot (VDC)
Pin 1-54.1,
Pin 2-52.1,
Pin 3-53.8,
Pin 4-42.9,
Pin 5-54.2,
Pin 6-54.2,
pin 7-53.4,
pin 8-54.1,
pin 9-54.1,
pin 10-53.7,
pin 11-54.3,
pin 12-54.0,
pin 13-53.5 and
pin 14-54.0. (Pin 1 and 14 adjacent to each other)
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