Hi team!
After many years of collecting dust, I fired up my original ADA MP-1 Classic, but to my horror, the front panel display never lights up. When power cycling the unit, occasionally, I can catch the main LED area (above the MP-1 text) show a program number for a millisecond, but then it goes out. Because of this, nothing happens when I press any of the front buttons. Therefore, I cannot adjust the tone. When plugging a guitar in the front panel jack, I can get the small EQ clip to light up, but that's it. I can hear by guitar through the Left and Right rear output jacks, and the headphone jack. The tubes are nice and amber. I removed the top cover and cleaned it all with air pressure. I discovered it has the original battery soldered to the board (I saw the posts on how to resolve that, which I will). Any ideas why the display won't work, and how I can resolve? Thank you!