A repair case of iPhone 8 main power supply grounding and not turning on

Category：movie

2020-10-14

Good afternoon, everyone, I’m the editor star brother Lan Rui.

Thank you for your continued support to our Lan Rui drawing team. We have been committed to creating more complete electronic maintenance drawings, in order to let everyone better understand the Lan Rui team. , We will share some actual combat experience with you from time to time, hope that when encountering the same failure problem later, colleagues in the same industry can avoid some detours, and more effectively improve the maintenance efficiency.

Lan Ruixing brother

today with you What I shared is: a repair case where the main power supply of iPhone8 does not turn on.

First of all, after the machine got the hand, according to the description of the mobile phone clip table short circuit by the peers, the motherboard was not obviously hot after testing by ourselves, and it could not be detected with rosin. Then we tested the fault and the peers described the same after we got it.

The following is our simple repair process, brothers who are interested may wish to read it.

Lan Ruixing brother

according to peers described that the motherboard has no obvious heat. After measuring the temperature with the lips method, we found that the lower part of the motherboard has a slight heat, and then touched it further and found that the IC temperature is higher. The rosin has been used at the beginning. But it is not easy to troubleshoot, so you can use the freezing method, because the gas temperature is extremely low, as long as the chip is slightly hot, it can appear instantly.

Lan Ruixing

To use this method, you first need to roughly lock the fault range, and then pay attention to it, as long as the component load is abnormal, it will appear for the first time, because the gas liquefaction time is very short, so when you use it , Be sure to observe, as shown in the picture: ↑↑↑

Lan Rui star brother

After using the freezing method, we find that the capacitor C5690 is damaged, so we can directly deduct it! Re-clamping the meter to start the current is normal, the fault is solved, and the repair is actually that simple, but in many cases you can't find the fault point, then you will spend a lot of time on it. The repair time of the peer is the efficiency.

Lan Rui Xingge

The machine maintenance is simply over here, and the case also needs to be handled by the colleagues in blue regardless of the high or low technology. Get a member of Rui. I am the star brother of the Lan Rui team. See you next time!

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