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Display Realpiano expander
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Lammert
Posted 7/19/2007 2:52 PM (#1851 - in reply to #843)
Subject: Re: Display Realpiano expander

Member

Posts: 49
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As you can see I've filed away a few millimeters from the display print just until the diodes and the tracks. Don't damage these. Then you will have enough space to place the new display.

You also need the old display, a standard 16x2 display (as a donor), a scissor, double sided tape, some gaffa (That's what it's called over here), a glue gun, a lot of flexible thin wires, soldering station, Solder wire, a side cutter, screw drivers and a lot of patience.

First, take apart the old display, that is pull it from the black plastic holder, therefore you need to desolder the two wires of the backlight which are soldered on the print.

I did not take pictures of that because I did that a few months ago.

I dit take one when it was 'in one piece'.





(display_front.JPG)



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Lammert
Posted 7/19/2007 2:56 PM (#1852 - in reply to #843)
Subject: Re: Display Realpiano expander

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Posts: 49
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The connections of the backlight are seen on the right side. When you took it apart you will be stuck with a piece of plastic which will be used again and some rubbish. You will need to carefully take apart the backlight and the display. Rip off the flexwire to the print, we don't need that anymore.

Also get rid of the nice flatcable which runs from display print to display. We won't be needing this anymore.
The aim is to get hold of the transflective piece behind the display. The GDM is a reflective one and you can't put a backlight behind this because it won't let light pass through.
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Lammert
Posted 7/19/2007 2:58 PM (#1853 - in reply to #843)
Subject: Re: Display Realpiano expander

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Posts: 49
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Now,

Carefully pull off the foil behind the display, we will be needing this!!!!

As you can see there will be some remains. It's a pity but it can't be helped.


Edited by Lammert 7/19/2007 3:00 PM




(transflective.JPG)



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Attachments transflective.JPG (40KB - 11 downloads)
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Lammert
Posted 7/19/2007 3:03 PM (#1854 - in reply to #843)
Subject: Re: Display Realpiano expander

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Posts: 49
25
Now,

From the Xiamen display remove (with soldering iron) the connector strip, we won't be needing it. I, at first did not but it is better to do so now.
Then take apart the two parts, that is display and print with a small screwdriver, it is glued together with a sticky tape.

Then, pull away the foil from behind the display. Be carefull not to break or scratch anything........




(remove foil.JPG)



(foil removed.JPG)



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Lammert
Posted 7/19/2007 3:05 PM (#1855 - in reply to #843)
Subject: Re: Display Realpiano expander

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Posts: 49
25
Now,

Stick the old foil to the new display. It should look similar like this.





(old foil new display.JPG)



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Lammert
Posted 7/19/2007 3:09 PM (#1856 - in reply to #843)
Subject: Re: Display Realpiano expander

Member

Posts: 49
25
Now, we need to get a backlight. The old one is sticky and old so I bought a new standard 16x2 display and took away the metal casing and the display with connector strips. One of these strips will be used later!!

Tested the now transflective display. Yes, it's all green/yellow............




(backlight testing one two.JPG)



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Lammert
Posted 7/19/2007 3:12 PM (#1857 - in reply to #843)
Subject: Re: Display Realpiano expander

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Posts: 49
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Desolder the 'new' backlight from your donor display, put some glue on the old black plastic holder and stick the backlight on it. Try to get it as far to the left and down as possible. You might bend the two wires so that they will be horizontal. No problem, if you only can reach them later with your soldering iron.





(glue.JPG)



(backlight on.JPG)



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Attachments backlight on.JPG (23KB - 7 downloads)
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Lammert
Posted 7/19/2007 3:16 PM (#1858 - in reply to #843)
Subject: Re: Display Realpiano expander

Member

Posts: 49
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Now, your new display should still be sticky. Put it on your backlight as far down as possible somewhat in the middle......



Edited by Lammert 7/19/2007 3:17 PM




(display on.JPG)



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Lammert
Posted 7/19/2007 3:21 PM (#1859 - in reply to #843)
Subject: Re: Display Realpiano expander

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Posts: 49
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Put back the metal bracket. The flex from the display is to short to place the print on the back of the plastic bracket so I placed it horizontally and glued it to the metal bracket.





(metal thing.JPG)



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Lammert
Posted 7/19/2007 3:23 PM (#1860 - in reply to #843)
Subject: Re: Display Realpiano expander

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Posts: 49
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With double sided tape glue the contact strip from your donor display on the metal bracket. Put on a new tape and glue the print on it. Secure it with some gaffa tape.




(print.JPG)



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Lammert
Posted 7/19/2007 3:27 PM (#1861 - in reply to #843)
Subject: Re: Display Realpiano expander

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Posts: 49
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When I tested the backlight in this stage the display looks a bit grainy. That's because some of the transflective foil did stick on the old display. This will stay as it is but the display will be very readable. When you stick the print don't strain the flex foil but give it some space.





(little grainy.JPG)



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Lammert
Posted 7/19/2007 3:31 PM (#1862 - in reply to #843)
Subject: Re: Display Realpiano expander

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Posts: 49
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Now comes the technical tricky part.
First solder wires on the print of the display. Be careful not to damage the display. Cut off the wires very short. Don't do this when you don't have a lot of soldering experience. Place the wires as in the picture. Choose any color you want but on pin 1 and pin 14 use black and red (power supply) as shown in the pic.





(wires.JPG)



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Lammert
Posted 7/19/2007 3:36 PM (#1863 - in reply to #843)
Subject: Re: Display Realpiano expander

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Posts: 49
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Bend the wires which go away from your display back so they also go over the display. In my case it's the green and white wires which had to be bended and placed over the yellow and blue wires. Take care you remember which wire is which pin!!!!!!!

Tape it so it won't damage the print. At a later stage we will glue them on the print with a hot glue gun. You could do that now if you want....

Now comes the tricky part. Place the display print and the display in the front of the realpiano and cut off the wires at the correct length. Not too long but definitely not to short because you will have to solder them on the print connector.





(connector.JPG)



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Lammert
Posted 7/19/2007 3:44 PM (#1864 - in reply to #843)
Subject: Re: Display Realpiano expander

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Posts: 49
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Here are the pins of the connector and the description.
Beneath that the same connector and pin number of the display. Notice that wire nr 14 (Negative voltage supply) is near to wire nr 1 (Positive voltage supply)

You look at this with the rear of the print facing up and the connector on the right hand. Look at the above picture where the red and the black wire are clearly visible on top. (+ and -)

Edited by Lammert 7/19/2007 3:48 PM




(connector print.JPG)



(Wires on print.JPG)



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Attachments Wires on print.JPG (4KB - 7 downloads)
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Lammert
Posted 7/19/2007 3:52 PM (#1865 - in reply to #843)
Subject: Re: Display Realpiano expander

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Posts: 49
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You also have to connect the backlight to the - and +. In between the positive line of the backlight (or negative) put in a series resistor of 10 ohms.
Then Check everything carefully. You can check + and - by the 4 pin connector on the left side. Black wire is negative and red wire is positive. Check if you didn't solder any shorts on the display and check that all wires are connected right.

Wrong connection of + and - will instantly kill you lcd. Some changes will be harmless but if you checked it very closely, CHECK it again. You don't want smoke but a nice display.

After checking at least three times give it a testrun. Mine looked like this.



(testrun.JPG)



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Lammert
Posted 7/19/2007 3:54 PM (#1866 - in reply to #843)
Subject: Re: Display Realpiano expander

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Posts: 49
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Bundle the cable bunch with a tie rap..........





(closelook.JPG)



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Lammert
Posted 7/19/2007 3:58 PM (#1867 - in reply to #843)
Subject: Re: Display Realpiano expander

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Posts: 49
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Now put it all together. Make sure that the wires are as high as possible because of the casing screw in the middle which could damage them.
Then clean up the wiremess. Give it another testrun. Mine needed a little mechanical adjustment. Be creative and glue everything in its place with a hot glue gun.





(display works again.JPG)



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Lammert
Posted 7/19/2007 4:04 PM (#1868 - in reply to #843)
Subject: Re: Display Realpiano expander

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Posts: 49
25
Replace the front. Tidy up inside and replace the lid. Quite a lot of screws (7) for the small lid.
If you need any help just send me a PM or place it here of email me at lammert 67 (at, you know that strange sign which hasn't been used for decades) and then the mail which doesn't get cold. Don't use spaces or underscores.

Have fun playing.......



(back where it belongs.JPG)



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Oliver Sheen
Posted 7/20/2007 12:14 AM (#1869 - in reply to #843)
Subject: Re: Display Realpiano expander

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Posts: 6

...........wow!
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Lammert
Posted 7/20/2007 1:07 PM (#1871 - in reply to #843)
Subject: Re: Display Realpiano expander

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Posts: 49
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impressed?

I have been a TV repair guy......


The kind with a screwdriver and a soldering iron, a little stuffed place, a PC and loads of junk waiting to be repaired........
Now I own a more decent job.
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Lammert
Posted 7/21/2007 3:21 AM (#1873 - in reply to #843)
Subject: Re: Display Realpiano expander

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Posts: 49
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I was just thinking when I surfed over the internet finding a more decent solution for the grain on the display and I found something quite interesting.
This guy placed an EL-foil behind a LCD module: http://www.compsys1.com/support/docs/...

That isn't so strange as I've repaired my Roland D70 by fitting a new EL-foil but it made me wonder. If I would remove the backlight and the foil from the old display maybe I could fit an EL foil (and an inverter).

Mr Dunczewski already helped me twice (roland MKS20 and D70) so in the near future I will order an EL foil and try to put it into the realpiano. That's for later, now it works as it is. Oh, here's his website: http://www.midi-rakete.de/eng/elfolie... The main website is in german and (except for andreas) hard to read/understand.

Regards, Lammert.
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uboot
Posted 8/4/2007 6:40 PM (#1913 - in reply to #843)
Subject: Re: Display Realpiano expander

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Posts: 91
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Congrats! Lammert, you'ra da man! Great :D
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