I joined just to post I was able to fix my Cinema 600 using the Amazon sourced power supply listed earlier in this thread. I reused the stock PCB standoffs, then drilled and countersunk a new hole at the reduced spacing. It all came apart and went together pretty easily and is self explanatory once you’re inside.
The hex driver sizes are 3mm for the housing fasteners, and 2.5mm for the PCB stand-off fasteners.
The 120V wires are not polarity specific, and the 24V lines go into the new power supply as labeled (red to +, black to -; left side of the new board’s wire block as shown in photos earlier in this thread).
On the 5V wires I joined the red and white wires into the 5V “+” output of the power supply’s wire block, and the black wire into ground.
Seems to work just the same as before. I also did a factory reset of the soundbar for good measure (hold down power and source buttons for 10+ seconds).
Thanks to the posters who came out with this info!
