Wharfedale Sub not working

[driftanz1]

Hi all! I have a Wharfedale SW100 powered sub that wont go. I have replaced 2 blown fuses on the amp board and i have power lights and the green light on the front going. Sometimes the Auto power turns the green light off after a while and sometimes it just stays on with no sound coming out at all. No obvious over heating on the boards or popped capacitors etc. It all looks very clean. Anybody had this issue before? Any help would be appreciated as i am pulling my hair out now!

 

[audioguru]

Blown fuses indicate that an output transistor or power amplifier IC is shorted.
A fuse blows because it is overheated with current that is much too high.