Re: Mackie Thump TH-15A repair, no sound and OL LED always on, power supply, low qual

Hey. New to the forum here. Just would like to thank Chungalin with this post. I had the same issue with a Thump th-15a last week. The +15 volts would drop out after a few seconds. I upsized s8550 and the problem went away. While i had the power supply board out, I also replaced c118 and c120 with 25 volt rated caps as the 16 volt rated ones were slightly under sized.