How to Turn On The Xiaomi Cell to Turn Off Completely

Xiaomi smartphone is a successful product from China. In his native country, sales were very large. Although many other smartphone giants at the time, Xiaomi managed to steal the public's heart.
Xiaomi's sales are good, but please remember the level of damage is also high. One of them is Xiaomi, which is totally dead.

How do I turn on a Xiaomi cell phone that is totally dead?

1. Battery

if you find Xiaomi dead completely, check the battery section. There are some that can be immediately released, and some are planted.
Should it be replaced immediately? Actually, if we have a multitester, we can check whether the battery is good or not.

2. Switch

The most accurate is measured by multitester. But for the first step, try pressing the switch, if there is a mechanical reaction, as if the sound of the switch is pressed. If there is, 90 percent of the switches are good. If there is no sound, please change the switch.

3. Charger.

Try changing it with another charger. Observe the difference, is it the same? Not infrequently, chargers are the culprit of the death of a smart phone.

4. Connector

Another common damage that occurs in a totally dead Xiaomi is the charger connector is damaged. Take good care, is there anything abnormal?

The damage to this connector, often causes the cell phone xiaomi cannot be charged.

This is a snapshot of the Xiaomi Mi4 LTE scheme. There are two IC chips which may be the cause of total dead damage. The U600 is a power IC, while the U800 is a CPU IC. The replacement process is quite complicated, it needs a lot of tools.

source https://vtiga.com/

Now there is one more trendy IC now. Because it is often damaged, the IC is now the monthly month of the technical. This U802 IC is known as IC eMMC.

How can we find out which is broken? Well, all that can be learned! The beginning of the analysis of the hardware part is to measure the amount of electrical current entering the cellphone. To be able to get this data, we need a Power Supply (instead of a cellphone battery) that has been equipped with Ampere meter. From this Ampere meter reading, the direction of improvement is determined.

Often Xiaomi's damage is totally dead, the current usage is zero or there is no electric current. If this is the case, we can conclude that the Power IC does not work. However, this does not mean that the Power IC must be replaced directly with a new one. We must first confirm the input of the power IC, which is the voltage of the battery. See footage of the Power IC scheme below.

source https://vtiga.com/

In the area given the red circle of the image above, we can see that in pin No. 214, 222, 223 is connected to the VBATT line. In other words, the legs of this Power IC must be connected to a positive battery voltage. If this voltage does not arrive, the IC power will not work. If the battery voltage is positive and the switch path is not problematic, then we can take steps to replace this Power U600 IC.