Hi Jayesh,

I got my fingers crossed for you.  Let us know how this goes.

Best regards,

On 5/16/07, Jayesh Salvi < jayeshsalvi@gmail.com> wrote:
Hi,

I have received the ribbon cable and it fits into the CN1 connector (#52746-2090) of my EDMGRB8KJF
I will solder the other ends of this ribbon cable to audiostix2 holes.

I am getting the CXA-L0512-NLJ inverter from earthlcd. I found one manual for this inverter (www.tdk.com.tw/ctl_pdf/ctl_6.2.2.pdf). But it might as well be dated. This manual lists CN1 (Molex 53261-0510) as its input connector and gives the pin connections for the same. This connector is outdated according to Molex website. So I will take Marc's advice of getting 538-51021-0700 from mouser.

Marc, could you let me know at what pins of this connector do you apply Vin and which one is GND? Also how much voltage do you apply? From the manual I found above it can be 0-14.4 V. How much should be sufficient to get EDMGRB8KJF working? I can buy the power adapter accordingly.

The person at HSC electronics today helped me understand how I can convert the output of regular power adapter to two terminals. The regular power adapters (AC to DC converters) have a female connector at the output (similar to the ones that go to portable CD players or old walkmans). He showed me a male connector which fits into the output of adapter and exposes two terminals Vcc and GND. Then I can wire them to the molex connectors like one mentioned above that gives input to the LCD inverter. I will post the exact name of the component when I go there next time to buy it.

Jayesh



On 5/10/07, Marc Humphreys < mhumphreys@logiclinkdesign.com> wrote:
BTW the TDK inverter from earthLCD uses a 7 pin 1.25mm connector for input power.
 
Molex Receptacle: Mouser P/N 538-51021-0700 
Molex Socket pins: Mouser 538-50057-8000
 
Marc


From: gumstix-users-bounces@lists.sourceforge.net [mailto:gumstix-users-bounces@lists.sourceforge.net] On Behalf Of Marc Humphreys
Sent: Thursday, May 10, 2007 7:52 AM

To: 'General mailing list for gumstix users.'
Subject: Re: [Gumstix-users] hardware troubles -interfacingPanasonicEDMGRB8KJF

I got the inverter from EarthLCD at the time I bought the LCD. P/N CXA-L0512-NLJ. I think its made by TDK. I haven't powered it up yet, but it did have the right connector and was the inverter earthLCD recommended.
 
Marc

From: gumstix-users-bounces@lists.sourceforge.net [mailto:gumstix-users-bounces@lists.sourceforge.net] On Behalf Of Jayesh Salvi
Sent: Thursday, May 10, 2007 12:44 AM
To: General mailing list for gumstix users.
Subject: Re: [Gumstix-users] hardware troubles - interfacingPanasonicEDMGRB8KJF

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 <jayeshsalvi@gmail.com> 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 <mhumphreys@logiclinkdesign.com > 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: gumstix-users-bounces@lists.sourceforge.net [mailto:gumstix-users-bounces@lists.sourceforge.net] 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). 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 < jayeshsalvi@gmail.com> 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 < celestialsyzygy@yahoo.com> 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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