OpenSprinkler Forums Hardware Questions OpenSprinkler I burnt it, I want to fix it

This topic contains 3 replies, has 2 voices, and was last updated by  Ray 1 month, 3 weeks ago.

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  • #47060

    Marco83
    Participant

    Hello, I did damage my 2.3 unit which is now not working.
    To make a long story short, I mistakenly allowed the COM cable (the one running through the valves) to touch one of the two sensor wires (looking at the unit, the one on the right). It made a noise and shut down, no chances of powering it up again. I clearly burnt something.
    Any idea of what I should replace to bring the unit back in business?

    Thanks!

    #47244

    Ray
    Keymaster

    There are a few things to check:
    – Unplug the main power connector. Instead, use a USB cable connected to a USB power source to check if the controller can power on. If so, that means the microcontroller is still alive.
    – Check your transformer to see if the transformer is still alive (if this is a 24VAC transformer, measure the AC voltage output; if this is a DC transformer, measure DC voltage). It could be that the transformer is burnt.
    – Visually check the TVS diode right above the sensor port. That TVS diode is there for high voltage protection. It could be that the TVS diode is burnt. If there is no visual damage, use a multimeter to measure the resistance across the TVS diode.
    The circuit actually has internal protection against accidentally plugged in COM wire to the sensor port, so I doubt is the microcontroller itself is damaged. It’s probably some peripheral element that’s burned.

    #47262

    Marco83
    Participant

    Thanks a lot! What is the resistence I am supposed to find on a working TVS diode?

    #47318

    Ray
    Keymaster

    It should be very large, at least several mega-ohms, if not infinity.

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OpenSprinkler Forums Hardware Questions OpenSprinkler I burnt it, I want to fix it