TECHNICIAN SOLUTION

 The motherboard power supply circuit of the laptop computer is an indispensable part of the laptop and its problems usually lead to various failure phenomena such as failure to boot, automatic restart, and crash etc. To learn the diagnosis and elimination of the fault of the power supply circuit of the laptop motherboard: Firstly, the basic working principle should be mastered. Secondly, the common fault phenomena caused by the problem of the power supply circuit of the motherboard should be understood. Finally, the maintenance experience of the power supply circuit of the motherboard should be continuously summarized and learned. method. 1- Laptop motherboard power supply circuit basics There are two ways to supply power to the laptop motherboard. One is the dedicated rechargeable battery for laptop computers and the other is to convert 220V mains to 19,5 or 20 volts. Powered by the power adapter. The laptop's dedicated rechargeable battery typically provides a lower supply volta

    Letter that symbolizes the Integrated circuits (IC) on the motherboard is U and may have another letters PU. EEPROM An EEPROM short for (electrically erasable programmable ROM) it is an integrated circuit (IC). In terms of applications, stores information that can only be read. Modifying it is either very difficult, EEPROM is also a type of non-volatile storage, which means that the information is maintained even if the component loses power. In the picture below, is an example of what a EEPROM chip may look like on your laptop motherboard. It contains the basic instructions for what needs to happen when a laptop is powered on. This is typically referred to as the firmware of a laptop. The firmware represents the basic code to get the laptop started. Firmware is also referred to as BIOS or basic input/output system. The BIOS also includes a test referred to as a POST (Power on Self-Test) which will ensure that the laptop meets requirements to boot up properly. If the laptop does no