Ensoniq Esq-1 blank screen after battery replacement

Hey everyone! I’m new here and I have an issue that I hope y’all can figure out. I’m stumped! I have an Esq1 that has been performing perfectly for years. The low battery warning has been coming on so I figured I would replace it. I’ve done this before in my other esq1 and never had a problem until now. Battery replacement went okay…but when I put it all back together I have a blank screen. Any suggestions??

Hey, welcome to the forum!

There’s a high chance it’s something to do with the connection between the mainboard and display board, it can be a bit finicky on some Ensoniqs. Check and make sure everything is as it should be and try reseating connectors. Also reseat connectors between the display board and power supply.

Does the synth still make sounds or is it totally unresponsive?

if you connect the display ribbon cable incorrectly you will pop a fuse. That fuse protects against just such a situation.
Check the fuses.