make sure all solder joints are complete and not 'shaky'
make sure there are no shorts on any output wiring. also might want to give the output chips (the 5532's) a bit of a wiggle to ensure that the problem isnt a bad connection from chip to socket, or from socket to pcb.
super quintuple check, it MIGHT be a chip, and you may want to replace them.. i finally just ordered a decent amount of 5532's and 5534's just because its nice to have extras.
but almost every time its a short, a bad solder joint, a miswire or an incorrect component (usually resistors)
i would check in that order:
bad joints (you can always just go through and give them a touch up),
shorts.... check very close pads for shorts with the DMM looking for 0 resistance, and have a printout of the circuit layout handy to check if they should or shouldnt be shorted.. sometimes its hard to know, because for some they are supposed to be making contact.
check wiring... *everybody* does silly stuff.... just double check
try the Chip Wiggle ;]
and if there are still probs, print out a resistor color code chart (they're all over the web) and check all the resistors ;] sucks, but thats what it comes down to sometimes.... it'll def teach you to measure every R before you put it in a board.
and once, testing a g1176, i realized that i had a bad cable on the output, and i had torn ALL my hair out trying to get it going..... it seriously *is* usually simple, just tedious....
it'll come through ;]
billy