Help with repair of treadmill controller - greenmaster

Discussion in 'Technical Repair' started by freaktoucha, Jan 8, 2019.

  1. freaktoucha

    Thread Starter New Member

    Jul 21, 2011
    I hope somebody can support to repair my treadmill controller board.
    I have this old treadmill that I have fixed before replacing main fuse and mosfet on controller board.
    Lately, again it strarted to run in full speed immediately, so when I checked the board, I found mosfet short, so I replaced it and now it is not moving at all.
    I checked on board around 300VDC is available at mosfet side, but no voltage going to motor terminals, transformer output and regulator 12V output is available and fine, main fuse is replaced with a link just for testing, no component looks faulty, saftety switch working fine and even replaced with short.
    I suspect this big block with metal part, but I don't know what is inside.
    Can anybody give any guidance on that?
    Any help would be much appreciated.
    Attached is a picture of controller board.