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Basic LCD driver question

Discussion in 'Microcontrollers, Programming and IoT' started by DanG, Jun 6, 2013.

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  1. DanG


    Feb 2, 2010
    I am working on some older marine equipment that use either the Hitachi HD44780 or a NEC UPD16434 LCD driver. I believe that the drivers are bad as the two units work with the exception of a "fluttering" partial display. I get the outline of the 5x7 blocks, but nothing else and these flutter.

    My question is: can I simply replace these drivers or do they contain programing that is specific to the LCD / equipment.

    If they contain programing, can then be copied and then replaced?


  2. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

    Nov 28, 2011
    As far as I can tell from the data sheet, the only "programming" the HD44780U contains is the character ROM and there appears to be only one version of that. There is no code, as such. Its behaviour is controlled by registers that are programmed by the host.

    I hope you have the tools to replace an 80-pin SMT device!
  3. DanG


    Feb 2, 2010
    Thank you for the reply!!!! I am going to try to change the driver out and will let you know how it goes.

    Thanks again,
  4. gorgon


    Jun 6, 2011
    The only thing you could experience is that they contain a different character set.

    If the display only flutters on a part it could also be the driver chips if you've got any, or a bad zebra strip.
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