Here's a tip to quickly Audio inspect large number of SMD solder (j)points, take a small wooden stick approx 6" to 9" long (to fit in one hand), heat shrink wrap and a average size sewing needle. You reverse the needle when heat shrinking it to the stick, leave a reasonable length running out, ensure it's well fixed( triple shrink wrap here). You run the needle tool over the solder joints and with a solid solder joint, you can hear these 'ring'. You can hear the dud's as a dull sound and check then solder these suspect joints. I hasten to add, there is a small learning curve involved in differentiating the duds, but you soon get up to speed and this takes the guess work out of non-soldered joints and really does save you time.