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  • LCD running very hot

    Ive just cabled my 40x2 lcd screen and its works fine but the screen seems to be very hot.
    On the backlight i cabled a +5v and ground, do i need a -5 instead of ground?

    Also how can i dim the backlight?


    Thanks


    Stoney

  • #2
    try wiring in a 27 ohm resistor to reduce heat/brightness, running a lcdat 5v = bad

    Comment


    • #3
      Originally posted by bgoodman
      try wiring in a 27 ohm resistor to reduce heat/brightness, running a lcdat 5v = bad
      true but i would depend on the backlight.... I have run my backlight at 5V for about 2 years and it gets warm, but I would not say hot.....
      Project - GAME OVER :(

      Comment


      • #4
        can someone have a look at this plz, its the pinout for my lcd.

        http://www.powertipusa.com/pdf/pc2004a.pdf

        what do i need for pin16? at the moment ive got it going to the power supply ground, is this correct?


        Thanks


        Stoney

        Comment


        • #5
          yeah id say so

          the black wire next to the red one on a molex connector

          Comment


          • #6
            i still dont get why its getting hot though?

            sorry bout this but can someone goto http://www.maplin.co.uk and tell me exactly what resistor i need cos i dont have a clue when it comes to electronics.


            Thanks

            Stoney

            Comment


            • #7
              Usually manufacturer specifications will tell you what size resistor u should have on the backlight to obtain maximum brightness and minimal heat buildup. For my 40x4 densitron, this value was approximately 2.3 ohms. Many lcd backlights are not designed to run without some type of current limiting device between it and ground.

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