A: It is very likely that it is dirty. The cable is not easy to break, but it often breaks due to sweat and water.
Q: It is considered to be splashed with water, not a lot, and the water is all at the tail. If there is no water, what is the problem?
A: If the tail is flooded with water, it usually does not affect the display cable on the upper part of the phone. It is very likely that your screen is broken. . . Go to the repair shop and ask him to take a new screen to try
Q: When the phone is turned on, there will be a bad point that lights up, and the position is different every time. Hardware problem
A: Hardware problem! Try changing the display screen. If the problem persists, it is usually a problem with the CPU to display J4 cable holder, which is difficult to repair.
Q: If the battery is removed, can the screw with the volume "-" be screwed? I dare not remove it more, at most I can remove the battery.
A: Yes, you can see the screws that fix the volume button cable after removing the battery.
Q: I bought a second-hand 4s. In addition to removing the back cover, is there any other way to check whether it is original?
A: Whether it is original depends on many details. Other things are not a big problem as long as the motherboard has not been moved.
Q: Sometimes it automatically turns down the volume to the minimum. It has been dropped. Is it a cable problem?
A: Automatically adjust the volume. This is a cable problem.