BadBoo_22

Not sure if thread still has life but, I've got an R-115SW NA, S/N: 106070115500297 that recently went out. Was working fine with a Pioneer Elite receiver, then I swapped receivers and when I plugged it in I got minimal sound then nothing. Now it rhythmically beats like it is trying to power on and off. It sounds like a heartbeat. The longer it is plugged in the quicker the power cycle rhythm. Afraid to do any more damage at this point. Not sure where to start and am hesitant to crack it up as I am average at best with an iron. Wondering what my options might be? Happy to compensate for time and experience into this. Cheers.