First time poster. I have a PSW10 that is not functioning and blowing the fuse. Upon further visual inspection I found the electrical component at position U5 to be charred, as some of the numbers are unreadable. The designation I can read is TDA72 and maybe a 9 and the last number is gone. If I had the complete component number I could order it from the electronics store and see if I have any luck as the part is only $10. it should be TDAxxxx. I emailed Polk last week and did not get a response. As these are only $90 new at Amazon, I am reluctant to put a bunch of money into the repair. Thank you for your advice and time. It was made in 2005.