Friend of mine asked me if I could take a look at his Tangent Evo E8 8" subwoofer which had gone silent. Found that both main filter caps (6800uF 50V "Chang" brand) had spewed their guts and the PCB had been burned to a crisp, with the heat seemingly coming from two zeners (ZD4 and ZD3 vertically below it in photo). Even if I was able to figure out the values of burnt resistors and diodes, the FR4 itself has been carbonised to the point where it falls to pieces when you poke at it.
So not really possible to repair, as such - but I could install a new amplifier in the enclosure. He's got no need for the low-pass filter since he's feeding it from an AV amplifier with a dedicated subwoofer line output. There's a beefy 27-0-27V transformer and a nice switched mains input socket that could be reused, by adding a new rectifier board with a couple of filter caps. I'm just not sure if it's worth the cost & effort!
What say the forum? Bin it - or McGyver it?