Category Smartphone & Pad Repair Guide

What causes a Redmi k40 not to turn on? Let's see how to repair it!

IPhone 11, the fault is that the whole board is silent. After receiving the machine, we tested it first, and found that the volume key didn't respond when pressed, the recording function didn't work, and there was no response when the setting was turned on to adjust the volume. We first checked the volume key after disassembling the machine, and found that the volume key had moldy traces. How to operate and maintain it? The following is a detailed introduction!

Glory 8X doesn't charge. First, the charging IC is replanted and installed, and then it is turned on for testing. It is found that there is a charging icon when the charger is plugged in, but there is no current. How can we get back to normal work? See the detailed explanation below.      

An iPhone13 doesn't turn on, which is caused by a short circuit of 2.6V hard disk. What about short circuit? It's usually a common fault of hard disk with current, isn't it?mobile phoneWhat about the common fault of current? Let's take a look at the detailed maintenance process of the maintenance master below.

OPPO R9S Plus, the fault is black screen plus touch failure. Take the motherboard out for testing. Since it is a touch failure of the black screen, let's first check whether the appearance and resistance of the seat display seat are normal. After testing, we found that there is no missing piece near the seat, and the resistance values are also normal. We also measured the display power supply and backlight power supply, which shows that it is not a display problem. At this time, we need to think differently ......See below for details:

IPhone 7Plus does not turn on (short circuit of power supply of power amplifier) [Fault model] iPhone 7Plus [Fault phenomenon] No boot. [Maintenance process] I received a machine sent by a customer for repair, the model is iPhone 7Plus, and…

IPhone 7, the fault is that the white apple can't restart into the system. When the single board of the machine was powered on, the current triggered the take-off to be normal, and it was restarted at 300mA. I immediately thought of the common fault of the seventh generation, and the bad audio led to the restart of the white apple. However, the specific reasons have to be analyzed in detail, so as to solve the problem, then learn more about it!

A second-repaired iPhone 11 failed to turn on. The second repair machine means that the last one was not repaired, and then it was sent to us for quick repair, which proves that our maintenance master is quite hard-core, so let's see how hard the professional maintenance technology of the maintenance master is!