roland juno g lcd screen replacement factory

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This item is fully tested and in great working condition.  Beware buying these used.  It is a common problem that the original display of the Juno-G malfunctions and needs to be replaced with the new Roland factory display that requires the 2.01 firmware upgrade.  If you search around online you will see how common the original display goes out.  I just replaced the original display because it was scrolling in different quadrants and characters were starting to be scrambled.  I replaced it with a new Roland Factory Display and Updated the firmware to 2.01 (necessary for the new display to work).   The new display looks and functions great.  The contrast is super clean and there are no more problems.  It looks great!

This item is fully tested and in great working condition.All the buttons, knobs, keys and jacks are working.  It has some minor scratches and a very little scuff by the pitch bender.  The “Juno” and “Roland” writing on the rear of the unit has some very minor scratches. There is a very little scratch on the “Rec” writing on the front of the unit.  It does not come with any expansions.

It comes with a non OEM power supply that is rated to meet its power needs.   The power supply has a shorter cord and is a little loose when connected to the back of the keyboard.  There is nothing wrong with the jack on the keyboard, it is just that the power supply jack doesn’t fit it tightly.  It would work for a studio but in a live situation you might want to separately purchase a Roland PSB-1U orPSB-120(not included).

Great SoundsRoland’s Fantom-X series is a grand-slam hit around the globe. The Fantom’s high-quality sound engine is a key factor in its success. The JUNO-G shares the same processor as the Fantom-X, and thus delivers the finest sound quality on the market — including an 88-note multisampled grand piano, and a wide range of sounds that span from classical to cutting-edge. You can further expand your JUNO-G with one of Roland’s SRX expansion boards (expansion boards not included).Audio/MIDI Recorder OnboardFor songwriters and performers, the JUNO-G’s 16-part MIDI sequencer is a must. But the addition of four companion stereo audio tracks is a huge bonus, and an unexpected surprise for an instrument in this price range! Now players can lay down the perfect backing tracks plus vocals, live guitar parts, and the like. The JUNO-G’s dedicated front-panel transport controls and mixer make the recording experience all the more friendly.Inviting InterfaceFor an instrument packed with so many features, the JUNO-G offers unprecedented ease of use. The aforementioned mixer and transport controls are only part of the friendly “hands-on” work surface. It has clearly labeled buttons, six knobs to modify sounds, five sliders for the audio section, a data wheel, a D Beam, and a pitch/mod lever. In the center of it all is the largest backlit LCD of any synth in this price range.Computer FriendlyThe beauty of the JUNO-G is that it can be used to by itself create complete songs from start to finish, but for those who want to take it one step further and incorporate a computer into the setup, the JUNO-G can be linked to a PC or Mac via its USB port. All MIDI communications can be handled over USB, which can also be used to send and receive WAV/AIF files and patch data.

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Any earlier version, and the keyboard *may* have the original version of the display (although why someone would install the fixed version of the display and then not install firmware 2.01 I don’t know).

If you have or buy a Juno G with the original display part, you now have no pathway to get your keyboard to acceptable reliability as the redesigned display part is sold out.

If I could find a source of the redesigned displays, I’d have no issues fitting it (i did a degree that included Electronic Engineering modules so I’ve fixes a few gadgets over the years), and could resurrect one of those “beer money” Juno Gs.

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Repairing electronic devices isn’t as hard as it used to be. Thanks to the internet, it’s easy to find datasheets and application notes for any standard component inside your gadget, and once you’ve found the faulty one, you simply buy a replacement from one of a million web shops — assuming you don’t end up with a fake, of course. When it comes to non-standard components, however, things get more difficult, as [dpeddi] found out when a friend asked him for help in repairing a Roland Juno-G synthesizer with a broken display.

The main issue here was the fact that the display in question was a custom design, with no replacement or documentation available. The only thing [dpeddi] could figure out from the service manual was the basic pinout, which showed a parallel interface with two lines labelled “chip select” — an indication that the display contained two separate controllers. But the exact protocol and data format was not documented, so [dpeddi] brought out his logic analyzer to try and decode the signals generated by the synthesizer.

After a bit of trial and error, he was able to figure out the protocol: it looked like the display contained two KS0713-type LCD controllers, each controlling one half of the screen. Finding a compatible replacement was still proving difficult, so [dpeddi] decided instead to decode the original signals using a microcontroller and show the picture on a modern LCD driven by SPI. After some intial experiments with an ESP32, it turned out that the task of reading two reasonably fast parallel buses and driving an even faster serial one was a bit too much for the ESP, so [dpeddi] upgraded to a Raspberry Pi Pico. This worked a treat, and thanks to a 3D-printed mounting bracket, the new display also fit snugly inside the Roland’s case.

The Pico’s code is available on [dpeddi]’s GitHub page, so if you’ve also got a dodgy display in your Juno-G you can simply download it and use it to plug in a brand-new display. However, the method of reverse-engineering an existing display protocol and translating it to that of a new one is pretty universal and should come in handy when working with any type of electronic device: say, a vintage calculator or multimeter, or even another synthesizer.