Understanding the Power-Up Cycle of a Smartphone: A Simple Guide for Everyone

In this video, we will explore the power-up cycle of a no-brand smartphone to demonstrate that the process is similar across all phone brands. Grasping the power-up cycle will enable you to identify faults more efficiently and provide quick estimates to customers.

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Step 1: Pressing the Power Button
To begin, press the power button three or four times for half a second each. If there is low current consumption, it indicates that this step is functioning correctly. Keep in mind that various processes occur in milliseconds, with some happening simultaneously.

Step 2: Observing the Power Management Integrated Circuit (PMIC)
When you press the power button for more than a second, the PMIC becomes active. The PMIC is responsible for managing the device's power supply, regulating voltages, protecting it from overloads, and controlling battery charging. There can be a primary and secondary PMIC, but for simplicity, we won't delve into those details here.

Step 3: Monitoring CPU, RAM, and Memory Consumption
For Samsung, Xiaomi, Realme, Oppo, Huawei, and Pocophone devices, there will be varying levels of consumption. For example, Samsung devices may consume between 140 and 210 milliamps, while other brands may range from 0.050 to 80 milliamps. At this stage, the CPU, RAM, and memory are all functioning.

Step 4: Activation of Integrated Circuits on the Motherboard
As the device powers up, there is an exchange of information between the CPU, RAM, and memory to activate other integrated circuits on the motherboard. You'll observe a maximum peak in power consumption that should not exceed 10 seconds. If it does, there may be an issue with the motherboard.

Step 5: Stabilization and Power Saving Mode
After the peak, the current drops, and the device stabilizes. If the phone is in use, the current consumption will increase, but when idle, it will enter power-saving mode. In this mode, the current consumption should ideally be between 3 and 10 milliamps.

Step 6: Navigating the Device Menu
When using the device menu, power consumption can vary between 500 and 700 milliamps, depending on the phone's model and range.

In conclusion, understanding the power-up cycle is crucial for diagnosing issues in smartphones. The primary components to consider are the PMIC, eFPMIC, and CPU, as these are the pillars of any mobile device. With practice and experience, you will be able to identify and fix faults in various devices, including changing integrated circuits up to the CPU and memory.

To further improve your skills, watch tutorials on our YouTube channel, where we provide step-by-step guides on changing integrated circuits, reballing, and soldering. Our content is designed to be accessible and easy to understand, even for a 15-year-old. So, don't wait any longer, and dive into the world of smartphone repair with confidence.

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