could you post a pic of both sides of your board? Double check the polarities of your components. The test you were doing before wouldn't be a bad test to check and make sure the copper track isnt broken. It's possible you got the board too hot and the copper pulled away from the board. Also, start from the speaker and work it back until you have voltage potential. Just leave one of your multimeter leads on the - and jump from point to point starting with the speakers +