# Ensoniq ESQ-1 : Successful repair of dead keyboard **URL:** \ **Category:** Synth Repair\ **Tags:** display-dead, no-audio\ **Created:** [April 27, 2026, 12:38am UTC](https://forums.syntaur.com/t/ensoniq-esq-1-successful-repair-of-dead-keyboard/9426 "2026-04-27T00:38:40Z")\ **Posts on this page:** 1\ **Showing post:** 6
**Author:** ![Didier](https://forums.syntaur.com/letter_avatar_proxy/v4/letter/d/41988e/32.png) [@Didier](https://forums.syntaur.com/u/Didier)\ **Post date:** [May 13, 2026, 8:08pm UTC](https://forums.syntaur.com/t/ensoniq-esq-1-successful-repair-of-dead-keyboard/9426/6 "2026-05-13T20:08:09Z")
Hello, I wasn’t as lucky as you. The unit on my workbench was stuck on the second startup screen. None of the panel buttons had any effect. However, in the Keypad/Display board’s self-test mode, they were recognized. The keyboard wasn’t working either, but my ESQ-1 was working via MIDI. After some discussions with Rainer Butchy, we strongly suspected the 6500/11 Keyboard, for which there is no clone. Fortunately, I had bought a disassembled ESQ-1 for parts some time ago. Replacing it with the 6500/11 Keyboard brought my ESQ-1 back to life. Thanks to my spare parts, I was also able to replace the CEM3379 in voice 5, of which only the left output was working. I also had to replace the volume potentiometer, which was completely inoperative. My ESQ-1 is ready for a new life ! I hope this experience is helpful to someone. Sincerely. --- _[View the full topic](https://forums.syntaur.com/t/ensoniq-esq-1-successful-repair-of-dead-keyboard/9426)._