Roland D-550 LCD upgrade

The goal of this little project was to upgrade the LCD on a Roland D-550 Linear Synthesizer with a recent, LED-backlit model. The D-550 comes with a HD44780-controlled, EL-backlit LCD. EL has a relatively “short” lifespan, and will usually die out after a dozen years or so, which is what happened on this unit. Replacing with a modern LCD was not entirely straightforward, and since I couldn’t find a HOWTO on the internet, I decided to publish my method, which is probably as good as any. Enjoy! It’s all documented after the usual:

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