I have a few stored away displays and found the SC1224 has stuck knobs. Otherwise it still works but volume a tad loud. Went to lower it and knob will not budge. All 3 knobs in fact are stuck.
From looking at various pictures, I believe what I have is the Hitachi model. Square design and these 3 knobs are on left side bottom as you look at the display.
Looks like this:
Any advice on how to unstick and get them moving again?