Pascal

Hello, I don't know if I can find help here .. and sorry for some "wording" (I'm posting from France). I've bought a Klipsch SW ~30 month ago (ref: R-100W), and and it doesn't work anymore .. (30 months !!). The green led lights up, the speaker is ok (I've tested) .. but no amplification .. After dismantling the card .. you can see (why this white paste ??). I'm able to change a component but I've no idea of which could be the cause of the problem. I know it's not a "top of the line" SW, but It would hurt me if I couldn't fix it. Sorry if I'm not in the correct forum. Many thanks, Pascal