Help with Motor Control Board - ProForm treadmill

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  • Crrose
    Senior Member
    • Dec 2013
    • 165
    • Usa

    #61
    Re: Help with Motor Control Board

    I also just tested the red and black wires that go from board to motor and not getting any reading at all but I do have 121.9v on AC1 and AC2.

    Comment

    • stj
      Great Sage 齊天大聖
      • Dec 2009
      • 30932
      • Albion

      #62
      Re: Help with Motor Control Board

      you may find that the 2 terminals that connect to the motor look like they are shorted together on the meter.
      that's called "static braking"

      Comment

      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA

        #63
        Re: Help with Motor Control Board

        What DC voltage do you get on the two legs of each Zener Diode you just put in.
        The DCV on those two filter caps should be around 160VDC (measured right at the two legs).
        Never stop learning
        Basic LCD TV and Monitor troubleshooting guides.
        http://www.badcaps.net/forum/showthr...956#post305956

        Voltage Regulator (LDO) testing:
        http://www.badcaps.net/forum/showthr...999#post300999

        Inverter testing using old CFL:
        http://www.badcaps.net/forum/showthr...er+testing+cfl

        Tear down pictures : Hit the ">" Show Albums and stories" on the left side
        http://s807.photobucket.com/user/budm/library/

        TV Factory reset codes listing:
        http://www.badcaps.net/forum/showthread.php?t=24809

        Comment

        • selldoor
          Slow Learner
          • Dec 2010
          • 7870

          #64
          Re: Help with Motor Control Board

          Originally posted by Crrose
          How would I apply 24v externally to the relay?
          I was thinking you had applied 24v to the motor to test it - I see it was 18v but
          that might also be enough to test the relay. Or perhaps a 24v printer adapter?
          Please upload pictures using attachment function when ask for help on the repair
          http://www.badcaps.net/forum/showthread.php?t=39740

          Comment

          • Crrose
            Senior Member
            • Dec 2013
            • 165
            • Usa

            #65
            Re: Help with Motor Control Board

            I get 6.6 and DZ1 and 24.2 on DZ4. I can't test the filter caps with it hooked up to the board due to the mounting frame being in the way and if I remove it then the heat sink will not work.
            Last edited by Crrose; 01-06-2015, 03:51 PM.

            Comment

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA

              #66
              Re: Help with Motor Control Board

              DZ1 15V Zener and you are getting 6.6V
              Never stop learning
              Basic LCD TV and Monitor troubleshooting guides.
              http://www.badcaps.net/forum/showthr...956#post305956

              Voltage Regulator (LDO) testing:
              http://www.badcaps.net/forum/showthr...999#post300999

              Inverter testing using old CFL:
              http://www.badcaps.net/forum/showthr...er+testing+cfl

              Tear down pictures : Hit the ">" Show Albums and stories" on the left side
              http://s807.photobucket.com/user/budm/library/

              TV Factory reset codes listing:
              http://www.badcaps.net/forum/showthread.php?t=24809

              Comment

              • selldoor
                Slow Learner
                • Dec 2010
                • 7870

                #67
                Re: Help with Motor Control Board

                Originally posted by Crrose
                I also just tested the red and black wires that go from board to motor and not getting any reading at all but I do have 121.9v on AC1 and AC2.
                From the AC it goes to the rectifier - BR1 comes out of there at around 160v
                and on to the Big Caps so if no voltage at the Caps it could be a problem with the BR1.
                Last edited by selldoor; 01-06-2015, 03:54 PM.
                Please upload pictures using attachment function when ask for help on the repair
                http://www.badcaps.net/forum/showthread.php?t=39740

                Comment

                • Crrose
                  Senior Member
                  • Dec 2013
                  • 165
                  • Usa

                  #68
                  Re: Help with Motor Control Board

                  Yes, 6.6 on the 15v now.

                  Comment

                  • Crrose
                    Senior Member
                    • Dec 2013
                    • 165
                    • Usa

                    #69
                    Re: Help with Motor Control Board

                    How can I test the Bridge rectifier and the big caps with the board removed?

                    Comment

                    • budm
                      Badcaps Legend
                      • Feb 2010
                      • 40746
                      • USA

                      #70
                      Re: Help with Motor Control Board

                      So what resistance do you get on that resistor sitting above those two Zeners, and the other one next to it?
                      Never stop learning
                      Basic LCD TV and Monitor troubleshooting guides.
                      http://www.badcaps.net/forum/showthr...956#post305956

                      Voltage Regulator (LDO) testing:
                      http://www.badcaps.net/forum/showthr...999#post300999

                      Inverter testing using old CFL:
                      http://www.badcaps.net/forum/showthr...er+testing+cfl

                      Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                      http://s807.photobucket.com/user/budm/library/

                      TV Factory reset codes listing:
                      http://www.badcaps.net/forum/showthread.php?t=24809

                      Comment

                      • Crrose
                        Senior Member
                        • Dec 2013
                        • 165
                        • Usa

                        #71
                        Re: Help with Motor Control Board

                        I haven't tested them yet because there is a mounting place under the board that I have to remove to get to them.

                        Comment

                        • Crrose
                          Senior Member
                          • Dec 2013
                          • 165
                          • Usa

                          #72
                          Re: Help with Motor Control Board

                          Never mind, I thought you were talking about the large caps.

                          Comment

                          • Crrose
                            Senior Member
                            • Dec 2013
                            • 165
                            • Usa

                            #73
                            Re: Help with Motor Control Board

                            I get 50v on inside and 35.6v on outside one.

                            Comment

                            • selldoor
                              Slow Learner
                              • Dec 2010
                              • 7870

                              #74
                              Re: Help with Motor Control Board

                              Originally posted by Crrose
                              How can I test the Bridge rectifier and the big caps with the board removed?
                              You can test the bridge like a double diode should have 4 pins 2 AC and 2 DC.


                              Bridge rectifier test when pins are in a straight line +....~ ~....-

                              a) put your multimeter in diode test mode
                              b) put your red lead on plus + DCpin side and the Black lead on adjacent ~ AC pin - record reading
                              c) reverse the leads - recording reading


                              Then repeat the test on the other two pins

                              b) put your black lead on negative -DC pin side and the red lead on adjacent ~ ACpin - record reading
                              c) reverse the leads - recording reading

                              Then for good measure change meter to ohmsq200 test the two middle pins
                              (AC pins) for shorts


                              You cant test the big caps with the board removed if the heatsink has to be detached to remove the board. Is it possible to securely solder insulated wires to the cap legs (joints) then reassemble and carefully test to the end of the wires

                              I am off to bed now - early start tomorrow!!
                              Please upload pictures using attachment function when ask for help on the repair
                              http://www.badcaps.net/forum/showthread.php?t=39740

                              Comment

                              • budm
                                Badcaps Legend
                                • Feb 2010
                                • 40746
                                • USA

                                #75
                                Re: Help with Motor Control Board

                                I am looking for resistance not of the resistors, but the Voltages sure look kind of low.
                                BTW, you can also check the DC Voltage of the MCU ST62Txx between PIN 9 (Vdd) and pin 10 (Vss) to see if it has running Voltage (around 5VDC).
                                Attached Files
                                Last edited by budm; 01-06-2015, 05:16 PM.
                                Never stop learning
                                Basic LCD TV and Monitor troubleshooting guides.
                                http://www.badcaps.net/forum/showthr...956#post305956

                                Voltage Regulator (LDO) testing:
                                http://www.badcaps.net/forum/showthr...999#post300999

                                Inverter testing using old CFL:
                                http://www.badcaps.net/forum/showthr...er+testing+cfl

                                Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                                http://s807.photobucket.com/user/budm/library/

                                TV Factory reset codes listing:
                                http://www.badcaps.net/forum/showthread.php?t=24809

                                Comment

                                • Crrose
                                  Senior Member
                                  • Dec 2013
                                  • 165
                                  • Usa

                                  #76
                                  Re: Help with Motor Control Board

                                  I will get back to this tomorrow, been fiddling with it since 7:30 this morning.

                                  Comment

                                  • keeney123
                                    Lauren
                                    • Sep 2014
                                    • 2536
                                    • United States

                                    #77
                                    Re: Help with Motor Control Board

                                    You will still need to check that the black, white and red wire connections. making sure you are getting the +5 and -5 volts speed control coming into the SCR board that is really a Mosfet board. I would think that these voltages turn on the gate of the Mosfet. If the mosfet is driving the motor there should be at least either the source or drain with the high DC voltage on it.

                                    Comment

                                    • Agent24
                                      I see dead caps
                                      • Oct 2007
                                      • 4913
                                      • New Zealand

                                      #78
                                      Re: Help with Motor Control Board

                                      Originally posted by Crrose
                                      The black one broke in half when I tried to remove it from the board
                                      That's a sure-fire way to know it's bad
                                      "Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
                                      -David VanHorn

                                      Comment

                                      • Crrose
                                        Senior Member
                                        • Dec 2013
                                        • 165
                                        • Usa

                                        #79
                                        Re: Help with Motor Control Board

                                        When I checked the black, white and red wires I get 7v red/black and 2v white/black.

                                        Comment

                                        • Crrose
                                          Senior Member
                                          • Dec 2013
                                          • 165
                                          • Usa

                                          #80
                                          Re: Help with Motor Control Board

                                          Originally posted by budm
                                          I am looking for resistance not of the resistors, but the Voltages sure look kind of low.
                                          BTW, you can also check the DC Voltage of the MCU ST62Txx between PIN 9 (Vdd) and pin 10 (Vss) to see if it has running Voltage (around 5VDC).
                                          I get 8.3v on pins 9 and 10, if I checked the right pins, last 2 on the left side if looking down on it.

                                          Comment

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