Dual Start Up Issue - Not Working

Discussion in 'Build Help' started by Liam Woinson, Mar 30, 2016.

  1. Liam Woinson

    Liam Woinson Member

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    Right guys when I turn my big box dual on the lcd flashes slightly but the buzzer goes off constantly. Not to sure what is wrong any suggestions? This is also on the Google group for a quick reply hopefully
     
  2. Rob Heinzonly

    Rob Heinzonly Well-Known Member

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    Usually this has something to do with the connection of your display. There are two things you should check:
    1. Did you flip your connectors on the lcd display 180 degrees ?
    2. Check your lcd connections on the Rumba board. Ext1 should be in Ext2 and vice versa.
     
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  3. Stefan

    Stefan Well-Known Member

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    May be the Guide needs here Big RED <blink> note about that 180 degree turn... it happens to a lot people.
    and.. why do we need that any way? is this a General Rumba (every time I must of my vac by that name) design error or a BB Rumba batch error?
     
  4. Dr Jeep

    Dr Jeep Well-Known Member

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    AFAIK it was a problem with a rotated silkscreen image on the back of that LCD module (which is off the shelf and not BB specific) but yeh it's pretty much the definition of counter intuitive that you have to do this so very easily missed.
     
  5. Stefan

    Stefan Well-Known Member

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    It cannot be the LCD... since I have an other one which is working with RAMPS1.4 and I had to rotate the connectors too when I tried it with thr BB Rumba
     
  6. Kick2box

    Kick2box Well-Known Member

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  7. Stefan

    Stefan Well-Known Member

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    so yes.... it's Rumbas fault :)
    Ok...thats the EXP1 and EXP2 exchange.... but the 180 degree socket turn is a Rumba error too I'm sure.
     
  8. MikeP-NZ

    MikeP-NZ Member

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    I just went through something similar with mine.
    If the LCD backlight comes on then you have plugged in EXP1 into the right connector and the right way round. (EXP1 as marked on LCD)
    If there's nothing on the display then there's a couple of possibilities.
    The contrast needs adjusting. It requires a precise setting or you see nothing on the display. It's easy to bump it off. Unfortunately you need to disassemble the display to make any adjustment.
    The other possibilities are bad or missing firmware.
    Bad connection in the cable.
    Faulty RUMBA board.
    Faulty LCD display.
     

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