Display / LCD 240x64

[jocamaneca]

Hello

I really need help.
I have a Roland G1000 piano, and it has a LCD 240x64 with 14 pins.
The delaer dosen´t has it to sell
Can you help me, telling me wich one I should buy, and how I can make the connections? Because I only see with 20 or 22 pins

Best regards
Jorge

[electr_peter]

Hi,

Where are you from? Fill a flag in user profile so it would be easier to help.

I suppose you have a problem with damaged display on digital piano. Can you describe symptoms of bad screen?
If screen has gone bad, just find a replacement and install it. LCD in question seems to be of very standard type with typical interface (8 parallel data pins and few pins for control signals/power). Not all pins are used, don't worry about it.
Similar to http://www.ebay.com/itm/321534780419 or www.ebay.com/itm/301017374539. You can choose a colour of LCD as well.

If you have skills, it is advisable to open up a piano and check exact dimensions and pin count on the old LCD so you can get proper display. Some pianos/keyboards get damaged from battery leaks and rust. I have saved one keyboard from battery leak inflicted rust, it is still going strong

Good luck with repair.

[jocamaneca]

Hello

Many thanks, I am from Portugal , a bit farway from Lytuania .

I attached my old Lcd
The screen has disappear an blue área, and has a lot of lines, that not allowed read.

Can you help me ?

Best regards
Jorge

[electr_peter]

I do not immediately find schematic of this part. I would suggest to either get a better quality schematic and determine LCD pin out from that or track down LCD pinout by checking with multimeter/oscilloscope (directly on LCD cable). Then you could easily buy 20 pin LCD and rewire it to fit existing 14 pin layout. 20 pin LCD should fit electrically and logic wise.

Old LCD seems to have CCFL type backlight. New LCD will be with LED backlight, so there is no need for that 3 pin connector.

[SL4P]

This site seems to have a reference to the ROHM 6018 LCD
No data - but they may be able to help with old stock or more info on a source

http://www.anglia.com/product_search/product_search/basicSrch/prdgrp_results.asp?prdgrp=SL1681&manufacturer=ROHM+SEMICONDUCTOR&orderby=&results=10&rohs=%25&offset=20

[jocamaneca]

Hi Electr_peter

 I hope you can see better in the attached files



Hi LS4P

That doesn´t work

[macboy]

Make sure that whatever LCD you buy to replace it uses the same set of chips, that is, one LC7942 and a trio of LC7941 (or LC7940 which is exactly the same, but different). These are very basic LCD drivers, not controllers. Most graphic LCD modules have a controller built in. You would then send commands that specify some text to display at a certain location, or a line to draw from here the there, etc. and the controller does it. Your display however is dumb. No offense, it just is. The controller is off-board, and that controller constantly sends data to the dumb LCD panel, one 240-pixel line at a time, 64 lines per screen, to refresh the display. It does this constantly, multiple times per second, to maintain the display. I guarantee that you will have a very hard time finding a replacement, because no hobbyist wants to use such a display. Good luck.

Hint: when searching, try dropping the suffix from the part number, so try LC7942 in addition to LC7942N.

[macboy]

What is wrong with the original display? Backlight died (easy fix)? Missing some lines or columns? cracked panel? No display at all?
Referring to your pictures, I see the problem now. The lcd glass is screwed up, cracked or leaking. You might have more luck finding a display with similar glass that you can swap out. But probably definitely not.

Try to figure out what the controller IC is. It is the one marked "LCD BLOCK" in the schematic attached in the earlier post. It should be near the LCD connector and will be directly wired to most of the connector pins. You might find a module with the same controller, and then might be able to somehow wire it in place of the existing controller. Or maybe you can find a LCD module with a (any) controller but with LC7942/41/40 chips on it, remove the controller, and wire the thing up to the piano's controller. One of those two may be your only hope. Dumb LCD modules without controllers are quite hard to find.

[jocamaneca]

I really need a new display or screen, because it has a few lines that doesn´t work and an area withou any colour

[wraper]

Seems that you will have very hard time to find a replacement for this display. What i see is that there are some displays in a wild with T6963C controller IC but otherwise the same chipset. Therefore they could be usable if ripping off T6963C controller and rewire the thing to be compatible with your one. But that likely will be not be trivial to do at all. As an other option, isn't there some LCD controller IC on the board it display is connected to? If there is, you could try to find LCD based on that controller. Then rip off original controller from the PCB and connect the display to the right pins according to controller IC datasheet. Not easy solution too, though.

[electr_peter]

Looking at LCD IC datasheets, I agree with other posters that it is very difficult to replace this LCD. Either exact match has to be found or significant modifications has to be made to make other LCDs work.

[MaiMei]

Hello everyone, I am from Spain and I have the same problem with the Roland G1000 keyboard, the screen leaks, I have tried to find a replacement screen, but without success and I have also tried to find a compatible one, but I am totally confused, and I have not found nothing, I hope someone can help me, I have seen that colleagues have tried to help their partner, but without success, but since the issue has been a long time ago, I would like to know if there is someone who already has a solution. Thank you
Thank you

[tunk]

English please - maybe you could use google translate?

[acaselli]

Hi all,
if sombody can help me.

In the  ROLAND E-500 I have the RCM6018 with IC6, an HC390.
Can I use an RCM6018 without it?
The difference?

Thanks so much,
Andrea
 ROHM RCM6018_si_HC390.jpeg (245.64 kB. 1200x1600 - viewed 185 times.)
 ROHM RCM6018_no__HC390.jpeg (280.21 kB. 1600x1200 - viewed 161 times.)