WHY WON'T MY 7 SEGMENT DISPLAYS COME ON?

Discussion in 'The Projects Forum' started by dyeraaron, Nov 10, 2008.

  1. dyeraaron

    Thread Starter Active Member

    Oct 27, 2008
    57
    0
    AM I just retarded or I've just fried my brain on this thing? why won't my displays at least come on with just DC Power...I don't have an AC Frequency hooke dup just yet, but shouldn't they still come on?
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    We know even less than you. Can you post up the schematic and the part number of the displays?
     
  3. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    I guess you forgot to connect the common cathode or common anode pin to ground or V+ respectively but a schematic will be helpful. Another reason is that you may use higher values of series resistors for each led segment than needed.
     
  4. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    If they are LCD 7-segment displays, they won't work without the AC excitation.
     
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