[YamahaDX] DX5 lcd replacement

[Edward Schultheis [e-mail] [YamahaDX]]

Hey all, looking for a list member from analog heaven...
He’s trying to find a replacement for his dx 5, anyone have any ideas?

[danforcz [e-mail] [YamahaDX]]

I have repaired backlight in my DX5, so I know something about.

Any standard display 40 x 2 compatible with HD44780 controller will work. Just check the size and thickness. I forgot if there’s a space for thicker display with LED backlight...

Yamaha dialect in the schematics:

- Pin 4 is described as MA0 - but it is standard RS (Register Select)

- Data pins 7 - 14 are described as PD

- +5 V is pin 2

There are also mistakes:

- Pin number under C1-4 should be C1-2, not C1-7

- Pin number C1-8 is there two times, one is connected to the ground.

- There’s another pin without number connected to the ground


Daniel Forro

Post by Edward Schultheis ***@gmail.com [YamahaDX]
Hey all, looking for a list member from analog heaven...
He’s trying to find a replacement for his dx 5, anyone have any ideas?
_

[Edward Schultheis [e-mail] [YamahaDX]]

Thanks!!

Post by danforcz ***@yahoo.com [YamahaDX]
I have repaired backlight in my DX5, so I know something about.
Any standard display 40 x 2 compatible with HD44780 controller will work. Just check the size and thickness. I forgot if there’s a space for thicker display with LED backlight...
- Pin 4 is described as MA0 - but it is standard RS (Register Select)
- Data pins 7 - 14 are described as PD
- +5 V is pin 2
- Pin number under C1-4 should be C1-2, not C1-7
- Pin number C1-8 is there two times, one is connected to the ground.
- There’s another pin without number connected to the ground

Daniel Forro

Post by Edward Schultheis ***@gmail.com [YamahaDX]
Hey all, looking for a list member from analog heaven...
He’s trying to find a replacement for his dx 5, anyone have any ideas?
_

['Dave Dillabough' [e-mail] [YamahaDX]]

Edward,

There are a couple of issues with replacing the DX-5 LCD display.

The first is that the original display uses an electroluminescent
backlight which has a high voltage drive. The EL panel dims with age.
These displays are rare now. If the problem with the display is a dead
backlight then it is possible to just replace the EL panel. This is pretty
simple to do and you can find replacement EL panels for sale online.

If the entire display needs to be replaced modern LCD displays use an LED
backlight with a much longer life. The main problem here is that the LED
backlights are thicker so the overall display has more depth. The signals,
controller chip and pinout are compatible though.

With the DX5 there is not really enough depth to mount an LED BL display.
Some physical modifications would be needed.

The other thing that you would need to do is to remove the high voltage EL
circuitry and wire in the LED backlight.

Not an impossible task but it will take some skill so you would have to
judge how practical it would be to do this yourself.

I have done this upgrade to several of my synths. The main issue with the
DX-5 is lack of space to mount a modern display. You can just cram it in
but the circuit board behind the display bulges out and is under stress.
Not great.

HTH,

Dave

Post by Edward Schultheis ***@gmail.com [YamahaDX]
Hey all, looking for a list member from analog heaven...
He’s trying to find a replacement for his dx 5, anyone have any ideas?

***@deepgreen.ca

[[e-mail] [YamahaDX]]

Omg, I have boxes of 2 x 40 LCDs (one specific model). Perhaps if you could show a photo of the LCD I can see if it's the same. Does it use LED or EL backlight?

[Edward Schultheis [e-mail] [YamahaDX]]

I’m posting for someone from the analog heaven list, so, im not quite sure!
I believe from previous posts here, it is originally el back.

Post by ***@jps.net [YamahaDX]
Omg, I have boxes of 2 x 40 LCDs (one specific model). Perhaps if you could show a photo of the LCD I can see if it's the same. Does it use LED or EL backlight?

['Dave Dillabough' [e-mail] [YamahaDX]]

Here is an example of where you can get replacement EL panels.

https://elpanelandtape.co.uk/el-backlights/

Post by Edward Schultheis ***@gmail.com [YamahaDX]
I’m posting for someone from the analog heaven list, so, im not quite sure!
I believe from previous posts here, it is originally el back.

Post by ***@jps.net [YamahaDX]
Omg, I have boxes of 2 x 40 LCDs (one specific model). Perhaps if you
could show a photo of the LCD I can see if it's the same. Does it use
LED or EL backlight?

***@deepgreen.ca

[danforcz [e-mail] [YamahaDX]]

There is EL foil.

Daniel Forro

Post by ***@jps.net [YamahaDX]
Omg, I have boxes of 2 x 40 LCDs (one specific model). Perhaps if you could show a photo of the LCD I can see if it's the same. Does it use LED or EL backlight?
.