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Re: [Electronics_101] Re: 2line 16segment lcd

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  • mark hubrich
    Yep thats what they are. Hopefully theres an image attached below... [image: Inline image 1] Now I just have to figure out what this means. ... [Non-text
    Message 1 of 7 , Jan 28, 2013
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      Yep thats what they are. Hopefully theres an image attached below...

      [image: Inline image 1]

      Now I just have to figure out what this means.


      On Mon, Jan 28, 2013 at 12:15 PM, mark hubrich <meistro57@...> wrote:

      > Yes this is exactly what i was thinking. 5 or 6 of them are ganged
      > closely, one off by itself i suspect is for the backlkght.
      >
      > I do have one really old one with a larger chip on it not covered in the
      > black crap. It's a HD4477... or whatever the typ. one is on most of these.
      > I'm going to check the datasheet since i can trace what pins they go to.
      > On Jan 28, 2013 8:44 AM, "Eddie Stassen" <estassen@...> wrote:
      >
      > I suspect the resistors you are referring to are used to generate the LCD
      > bias voltages (usually 5 or 6, grouped together)
      >
      >
      > On Mon, Jan 28, 2013 at 1:42 PM, Stefan Trethan <stefan_trethan@...
      > >wrote:
      >
      > > **
      > >
      > >
      > > One or more of the resistors might be to limit current to the backlight,
      > > yes.
      > > The pinouts typically conform to one of a handful of standards, do a
      > > google image search for "lcd pinout" to see some examples.
      > > Unless there are markings it's detective work from there.
      > >
      > > ST
      > >
      > >
      > > On Mon, Jan 28, 2013 at 12:32 PM, mark hubrich meistro57@...>
      > wrote:
      > > > Every single one of them is typical on the back. Different layout
      > > placement
      > > > of the resistors. Different brands, sizes, etc. No part markings
      > though.
      > > >
      > > > It appeared to me that all 2 line lcd's had this in common, regardless
      > of
      > > > their age or size.
      > > >
      > > > This is why I asked such a generic question without the extra info. I
      > was
      > > > having a feeling my question was going to come across as 'one of those
      > > typ.
      > > > We need more info posts'
      > > >
      > > > I'll try to get some pics posted, you'll see what I mean.
      > > >
      > > > I have some assumptions ...
      > > > One seems to be for the backlight, the rest for logic?
      > > >
      > > > I just thought of a test I could do. Remove the resistors from one that
      > > > works with 5v and put them on one that doesn't. However the 16 pin
      > > > arrangement may be different.
      > > > On Jan 27, 2013 9:59 PM, "AlienRelics" alienrelics@...> wrote:
      > > >
      > > >> **
      > > >>
      > > >>
      > > >> We need a lot more than that - a model number? Picture of the front
      > and
      > > >> back?
      > > >>
      > > >> Still might not be able to tell you.
      > > >>
      > > >> Steve Greenfield AE7HD
      > > >>
      > > >> --- In Electronics_101@yahoogroups.com, "meistro150" wrote:
      > > >> >
      > > >> > Does anyone happen to know what the resistor values are for these
      > that
      > > >> are found on the back? And what they are for? I have some from various
      > > >> things and I think that some are setup to use 12v. I'd like to use
      > them
      > > >> with 5 volts. I think the labels are R1 through R7. The ones I like
      > are
      > > >> hard to find data for. Most were pulled from security alarm control
      > > panels.
      > > >> >
      > > >> > Thanks
      > > >> >
      > > >>
      > > >>
      > > >>
      > > >
      > > >
      > > > [Non-text portions of this message have been removed]
      > > >
      > > >
      > > >
      > > > ------------------------------------
      > > >
      > > > Please trim excess when replyingYahoo! Groups Links
      > > >
      > > >
      > > >
      > >
      > >
      > >
      >
      >
      > [Non-text portions of this message have been removed]
      >
      >
      >
      > ------------------------------------
      >
      > Please trim excess when replyingYahoo! Groups Links
      >
      >
      >
      >


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