Using the wrong screws can be costly
If you’ve ever had to repair an iPhone you’ll know they have a ridiculous number of screws. Most companies standardize screws in their products, but since Apple doesn’t expect or want you to service your iPhone yourself, they use different length screws. Using the wrong screws can be costly.
You see, each of these screws is different. The red ones are 1.7mm long, the yellow one, 1.3mm, and the orange one, 1.2mm.
Guess what happens if you install either red or yellow screws into the orange spot, since your eyesight isn’t good enough to notice a 0.1mm difference? The screw will cut into the PCB and break several 50 micron traces, as shown in the picture above, causing a blue screen error on the phone. The only way to repair this is by micro-soldering wires to make the connection again. What started off as a simple screen repair ends up being a costly logic board repair. Make sure to keep all screws organized and know where to put them once they’re off.