Re: [Gumstix-users] hardware troubles - interfacing PanasonicEDMGRB8KJF

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I found one list of inverters that has output connector (BHR-03VS-1) that is
same as my Panasonic LCD:

http://www.esskabel.de/English-Site/products/lcd-cable-adapters/LCD-invertercable/LCD-Crossrefernzlist/lcd-crossrefernzlist-Main.htm

Any comments?

Thanks,
Jayesh

On 5/9/07, Jayesh Salvi <jay...@gm...> wrote:
>
> Thanks Marc. Glad that you verified the part numbers. Now I will be more
> confident soldering it.
>
> Would you be able to share which LCD inverter you have used/ you would
> recommend?
>
> Thanks,
> Jayesh
>
> On 5/9/07, Marc Humphreys <mhu...@lo...> wrote:
> >
> >  Jayesh - I saw you answred you're own issue, but for other who may want
> > the 3 or 6 inch flex here are the numbers as well at the connector P/N.
> >
> > I was able to get everything from Mouser Electronics.
> >
> > Molex FPC 3" cable: Mouser P/N 538-21020-0215  MFG part # 21020-0215
> > Molex FPC 6" cable: P/N 538-21020-0215  MFG part # 21020-0215
> >
> > FFC/FPC connector - for the other end of flex that I will hot glue to
> > breakout board and solder wires between it and the breakout pads
> >
> > Molex FFC/FPC RA SMT ZIFF bottom 20 Mouser P/N 538-52746-2070  Molex P/N
> > 52746-2070
> >
> > Marc
> >
> >  ------------------------------
> > *From:* gum...@li... [mailto:
> > gum...@li...] *On Behalf Of *Jayesh Salvi
> > *Sent:* Tuesday, May 08, 2007 11:16 PM
> > *To:* General mailing list for gumstix users.
> > *Subject:* Re: [Gumstix-users] hardware troubles - interfacing
> > PanasonicEDMGRB8KJF
> >
> > I think I have found the parts I will need so far, but now I have
> > problem buying them. They are available in quantities of 2000 only. :(
> >
> > As I mentioned in the first post, to connect to the CN1 connector
> > (#52746-2090) of the LCD display one will need a ribbon like connector. That
> > seems to be the case. Molex's website has pretty good information about
> > these kind of connectors. They are called FFC/FPC connectors. However the
> > use of the ribbon is going to make the soldering only little easier. Because
> > it is not meant for soldering at the other end. Its other end is supposed to
> > go in another molex connector. BTW the Molex part number for this ribbon is
> > #0210200212. Ideally the other end of this wire should go to the molex
> > connector which is mounted on a PCB which will space out the contacts so
> > that we mortals can solder our wires to them. But since it is not feasible
> > right now, I could spend some eye-straining hours on soldering those thin
> > strands coming out of the ribb on.
> >
> > But Alas! These parts either not available OR if available only in
> > quantities of 2000 minimum.
> > I am also checking out ebay if I get lucky there.
> >
> > On the front of CN2 connector - i.e. power supply - I found that this
> > connector should be fed by an LCD inverter circuit.  A good explanation can
> > be found here ( http://www.dnd.utwente.nl/~grit/backlight/ccft.html<http://www.dnd.utwente.nl/%7Egrit/backlight/ccft.html>).
> > It seems like LCD inverter circuits are pretty common (In fact the one I
> > mentioned in my first post that I found at HSC electronics was an LCD
> > inverter circuit) and I am hopeful more research will help. I looked inside
> > my broken Dell 600m to salvage its inverter, with Dell's diligent efforts
> > any such circuitry is hard to identify, let alone reuse.
> >
> > I didn't think it would be so hard when I heard that this touch screen
> > LCD has been used on this list couple of times before. Could somebody who
> > has contributed to those nice wiki pages, please reply on this thread? It
> > will be greatly appreciated.
> >
> > Meanwhile, I will keep digging and keep you posted.
> >
> > Thanks,
> > Jayesh
> >
> > On 5/8/07, Jayesh Salvi < jay...@gm...> wrote:
> > >
> > > Yes Otis, I have made some progress - at least in the understanding of
> > > what is needed. I am just waiting to do some more research to confirm that
> > > the parts are really what I need. I will post few components I have found by
> > > tonight.
> > >
> > > Thanks,
> > > Jayesh
> > >
> > > On 5/8/07, celestialsyzygy < cel...@ya...> wrote:
> > > >
> > > > Jayesh,
> > > >
> > > > I am also planning to purchase the panasonic lcd. I think I'm in the
> > > > same boat as you; I have a lot more software experience than
> > > > hardware,
> > > > so I was wondering if you had made any progress.
> > > >
> > > > Thanks!
> > > >
> > > > Otis
> > > >
> > > > Jayesh Salvi wrote:
> > > > > Hi all!
> > > > >
> > > > > I knew that it would be tough to glue the various hardware
> > > > components
> > > > > together before I can start working on the software. But it's
> > > > getting
> > > > > harder.
> > > > >
> > > > > I bought the Panasonic EDMGRB8KJF LCD and it arrived on friday. As
> > > > I
> > > > > mentioned elsewhere on the list, I found it easy to find all the
> > > > > pinouts from gumstix wiki and other places and thought it would be
> > > >
> > > > > just a matter of soldering one point to another.
> > > > >
> > > > > What I realized was the interface connectors on this LCD are lot
> > > > more
> > > > > sophisticated (hence hard to solder) than what I had done few
> > > > years
> > > > > back in school. I spent most of my saturday morning scouring the
> > > > > surplus electronics stores - Weirdstuff, HSC electronics. But no
> > > > one
> > > > > could answer my questions about what part to look for. So I spent
> > > > rest
> > > > > of the day on internet googling. But not much help. Now that I
> > > > know
> > > > > some people on this list have interfaced this particular LCD with
> > > > > gumstix board, I hope someone will be able to advise me on my
> > > > problems.
> > > > >
> > > > > The Panasonic EDMGRB8KJF LCD has three connectors: CN1, CN1 and a
> > > > 4
> > > > > wire ribbon coming from touchscreen.
> > > > >
> > > > > CN1 - Molex P/N 52746-2090 - This is the connector that exposes
> > > > the
> > > > > pins that drive the LCD functionality (Specs:
> > > > > http://www.mouser.com/search/ProductDetail.aspx?R=52746-2090_BULKvirtualkey53810000virtualkey538-52746-2090
> > > >
> > > > > <http://www.mouser.com/search/ProductDetail.aspx?R=52746-2090_BULKvirtualkey53810000virtualkey538-52746-2090
> > > > >)
> > > > > I will have to connect the audiostix2 connectors to this molex
> > > > pins.
> > > > > This seems to be an advanced one in the series of connectors that
> > > > > Molex manufactures, because I found some bigger versions that
> > > > looked
> > > > > like it at the above mentioned stores that would have been easier
> > > > to
> > > > > solder. The technicians at the stores could tell me that, there
> > > > will
> > > > > be a ribbon like strip that will go into these connectors and you
> > > > can
> > > > > solder at the far end of the ribbon. Now I don't know where to
> > > > find
> > > > > that ribbon-like connector. Or is there altogether different
> > > > method to
> > > > > connect my audiostix2 pinouts to this molex connector. What
> > > > methods
> > > > > were tried by other users to make this connection?
> > > > >
> > > > > CN2 - JST P/N BHR-03VS-1 - This is a power supply connector - The
> > > > > description I found for it from digikey catalogue is "2-3 Pos.,
> > > > 8mm,
> > > > > Crimp Connector Style BH Housing". I wonder how am I going to find
> > > > a
> > > > > bridge between a regular wall-socket-power-adapter to this 3 pin
> > > > power
> > > > > supply input. At the HSC electronics however, I think I saw a
> > > > circuit
> > > > > board that was converting the power into this three pin interface.
> > > > > Right now designing another circuit board just to give power seems
> > > > > infeasible for me. But I looked at many LCD displays at the HSC
> > > > store,
> > > > > and found that they all have similar kind of power inputs. So I am
> > > > > hopeful someone on this list will suggest me a simple and quick
> > > > way to
> > > > > do this.
> > > > >
> > > > > Touchscreen interface - I think this seems the simplest one. I can
> > > >
> > > > > just solder the ends of this ribbon connector to audiostix2's
> > > > UCB1400
> > > > > pins.
> > > > >
> > > > > Indeed, hardware interfaces are not as simple as #include <
> > > > > interface.h> :(
> > > > >
> > > > > Thanks in advance for your help!
> > > > >
> > > > > Jayesh
> > > > >
> > > > >
> > > > >
> > > > ------------------------------------------------------------------------
> > > > >
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