Product testing is very important, you can run a battery of electrical testing on your PCB but a visual inspection is also very important to spot failures that are waiting to happen in the future. Our friend Bob Davis has been busy repairing all sorts of random electronic items. The Bad solder joints seen above are from a Crown XTi 1000 power amplifier which is an amp that retails at over $1,000. You would think there would have been enough profit in there to allow for a quick visual inspection.