OpenSprinkler Forums Hardware Questions OpenSprinkler Bee (OSBee) Hardware defect, need some info

  • This topic has 3 replies, 2 voices, and was last updated 1 month ago by Ray.
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  • #67997

    Tobasco
    Participant

    Hi,
    my OSBeeWiFi 2.0 worked fine for the last 3 years. Yesterday it rained heavily and I disconnected the USB cable to skip the planned irrigation. After reconnecting the USB cable today the display stayed black and it smelled like hot electronic. I disassembled the OSBee and found a dead small spider and it’s net below the display. I cleaned it and disconnected the valve cable and tried to start the OSBee but I figured out that two SMD elements become very hot (see attached image). One of them is labeled with “XOKB 32”. I neither found any other hot elements nor other damages.

    I have two questions:
    1) What is the correct replacement for these SMD elements
    2) Does it make sense to replace them or is the causing issue somewhere else?

    Thanks in advance
    Thomas

    #68003

    Ray
    Keymaster

    The component on the left (marked QPC) is AO3407 (or CJ3407 as equivalent) — it’s a P-MOSFET.
    The one on the right (closer to COM) is AO3400 (or CJ3400 as equivalent) — it’s an N-MOSFET.

    #68014

    Tobasco
    Participant

    Hi Ray,
    thanks for the quick response!

    I found the AO3400 in the circuit diagram on GitHub but not a AO3407. Instead an AO3401 is present.

    Should I anyhow use the AO3407?

    salute
    Thomas

    #68017

    Ray
    Keymaster

    I recommend using AO3407, although AO3401 should also work. AO3407 has higher gate-source maximum voltage compared to AO3401.

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OpenSprinkler Forums Hardware Questions OpenSprinkler Bee (OSBee) Hardware defect, need some info