[Jmitchell3]

I am a newbie to DIY audio! I purchased these monoblocks that were already built 5+ years ago and theyve operated flawlessly until now. A few days ago in my home theater the left monoblock’s blue status light in the front was slowly pulsing, and the connected speaker produced no sound. The right channel block had a solid blue status light and appeared to be ok.

Fast forward i let each block sit disconnected from power and source and speakers overnight then opened them up and swapped the psu boards (smps600v3) and plugged everything in again and now neither blue light illuminates on either device.

I do have a background in building my own computers so im used to and comfortable with working with circuit boards and etc.

Any ideas what could be wrong or what next steps i should take to continue troubleshooting? Please see attached images.

[Doublej]

I would put the PSU boards back in their original positions and see if the right channel block comes back to life. If it does, it would seem to me that you have a failure in the left PSU board and a second failure in the left amplifier board.