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PostPosted: Wed Jan 12, 2005 16:04 
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Joined: Wed Jan 12, 2005 15:35
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Hi

I just got an Epson graphical display off an internet auction. The model number is EG7504C-RS and it has 320x200 pixels. I have the data sheet, but it doesent tell anything about what controller it uses (if it has any), only pinout, function specifications and adressing. I tried to connect the display directly to the lpt port guided by a schematic for a simular display from Liquid-MP3 (http://liquid-mp3.schijf.org/schematics/Hyundai_HG25504.gif). It basically had the same ports, only in a different pattern, so i conneced it to fit the data sheet of my display. I also added a supply voltage of 3,3V and a LED voltage (display) of 2V as specified in the data sheet.

The problem is that nothing really happends when i connect it to the parallell port. I didnt know what controller to use so i tried a bounch of them, and a few different programs. At one point the backlight lit up, but i havent been able to reproduce the effect. I also tried to control the ports directly to match the display on/off control, but i didnt get it to work.

So my question is, what can i try now? I'm also not sure if pin 1 on the lcd cable starts from the top or the bottom, any suggestions here? I will gladly add some pictures or info from the data sheet if that could clear things up.

Help would be greatly appreciated! Sorry about the long post :oops:

Pinout:
1:Vdd 2:LED+ 3,4:Vss(ground) 5:Reset 6:CS 7:RD 8:WR 9:A0 10:Vss 11-18:DB0-DB7


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PostPosted: Sun Jan 16, 2005 11:02 
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Joined: Sat Apr 17, 2004 17:42
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Location: The Netherlands
Well you mention it has '11-18:DB0-DB7' that means it has a controller onboard, likely a SED 133x.
How about a pic of the backside and a link to the tech specsheet?
That Hyundai_HG25504 wiring scheme is not for the SED133x, so that would not work.

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PostPosted: Tue Jan 18, 2005 0:55 
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Joined: Sun May 05, 2002 22:05
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Location: Lappeenranta, Finland
coorz wrote:
That Hyundai_HG25504 wiring scheme is not for the SED133x, so that would not work.

Hmm, sure about that ? That HG25504 wiring from Eelco looks very much like SED1330 to me.


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PostPosted: Tue Jan 18, 2005 1:33 
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:oops: my mistake, i see now in the spec sheet it's a SED1330 alright.
So that scheme *should* work!

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PostPosted: Tue Jan 18, 2005 17:23 
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Joined: Wed Jan 12, 2005 15:35
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Thanks alot for the reply, i will post a picture as soon as i get my cam back in a week or so. I only have the specs on paper, but hopefully i can get it scanned.

I hope you will check back on this post in a week or so :D


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PostPosted: Sun Jan 23, 2005 2:54 
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Location: Lappeenranta, Finland
I recently saw some information that would suggest that this display would use the SED1590 controller.

But if you get the datasheet in digital form I'd be interested having a look.


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PostPosted: Tue Jan 25, 2005 19:30 
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Hi again,

I finally got the datasheet scanned, and uploaded it here. Sorry about the *.tif-format, but i didnt have the software to change it. If you have problems seeing all the files, i also zipped it for download here.

I will also get some pictures out in a few days. Thanks for helping :D


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PostPosted: Sun Feb 06, 2005 0:10 
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Joined: Sat Oct 30, 2004 2:14
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EPSON 320X200, B/W, LCD DISPLAYS MODEL EG7504C-RS
: LCD displays model EG7504C-RS with LED backlight and onboard Epson SED1590 controller.

Not much info about this controller:

The Seiko Epson SED1590 is a 181K dual port SRAM Segment Driver with an on-chip controller. The SED1330 is a CMOS Graphic LCD driver

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PostPosted: Mon May 23, 2005 23:26 
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Any news on this LCD? Driver wanted

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PostPosted: Sat May 19, 2007 0:21 
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Joined: Fri May 18, 2007 22:43
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Updating this thread.

Maybe getting one of those in 1 or 2 days, and I wonder if its possible to connect it to my pc?

and i think i have a datasheet

http://www.stentor.no/Epson%20EG7504C-RS2.pdf


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PostPosted: Wed Sep 05, 2012 7:10 
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Joined: Wed Sep 05, 2012 7:06
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Hi, does anyone know where I can buy this part? EG7504C-RS? I need about 2000. Please email me icelbra3@yahoo.com
thanks!


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