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Hello engineers I’m a newbie with a simple question for you. I am trying to learn how to micro-solder and was practicing on an i-phone 7 logic board, attempting to remove the audio i.c. Probably too complicated for training, but after i finally got the i.c. off I noticed several of the balls on what I guess would be the base were missing. They looked silver as opposed to the copper colored ones on the i.c. I tried to apply solder thinking the solder would be attracted to the spot where it should go but no luck
The iPhone 7 audio IC has a few NC pads that usually come off with the chip. These are not required and are not connected to any circuit that is why they come off. Check the ones that came off are not NC pads.
Blue pads are NC
that is called ripped pads on the motherboard, and its bad, if you have schematics, you can check what the damaged pads are for. maybe you can bridge them. you have to practice more, since this happens when you don’t use the correct amount of air/heat/flux. this all depends on the calibration and brand of your hot air station. keep practicing
