The power adapter cannot be used normally due to the virtual welding of the power interface of the l


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The power adapter cannot be used normally due to the virtual welding of the power interface of the l

The fault phenomenon
A laptop can be started up normally with its rechargeable battery, but cannot be started up normally with the power adapter. After plugging in and out the power adapter, it can be turned on occasionally, but sometimes the power will be suddenly cut off.
Fault judgment
The rechargeable battery can be started up normally, which means that each functional circuit on the motherboard is normal. When using the power adapter, it cannot start up normally, which indicates that the reason for the failure is mainly in the power interface circuit of the host computer and the protection and isolation circuit. After the plug and pull out of the power adapter, the power can be switched on occasionally, but sometimes there will be a sudden power failure phenomenon, which indicates that the host power interface may have virtual welding, damage or problems with the electronic components in the circuit.
troubleshooting
Step 1: for the fault that the rechargeable battery is able to start up normally, but the power adapter is not able to start up normally when using the power adapter, the power adapter used by the defective laptop should be determined first to be ok.
The test shows that the output power supply of the power adapter used by the faulty laptop is normal.
Step 2: in view of fault judgment, the machine should be dismantled for inspection.
Even if the scope of the cause of the failure of the laptop is confirmed, the first maintenance step after disassembly is to clean and observe the failure of the laptop.
Clean up and observe the maintenance steps, usually in the case of no power to check the main chip on the motherboard of the faulty notebook computer, electronic components and hardware equipment appearance there is no obvious physical damage. If the chip charred, crack, virtual welding, capacitor drum, leakage, circuit board burned out or deposit excessive dust, various interface equipment without obvious welding. When more obvious physical damage or virtual welding or open welding problems are detected, these problems can be directly welded or replaced.
In view of the fault laptop, should focus on cleaning and checking the host power interface circuit whether there are problems.
Step 3: no obvious problems are found after cleaning and checking. According to the failure of the laptop, power should be added to check whether the output power supply of the power interface circuit of the host computer is normal.
Step 4: take apart and weld the power interface of the host computer and re-weld it. Add power again for test. VIN power supply can be output normally and the fault can be eliminated.
Summary of experience in troubleshooting: low-end positioning or laptop with long service time and poor service environment is more likely to fail due to virtual welding or damage of hardware equipment or electronic components. Some virtual welding or damage can be directly observed by visual inspection, but most of the virtual welding or damage requires the analysis of the fault phenomenon and related circuits to be known. Therefore, it is very important to analyze the fault phenomenon and related circuit of the faulty notebook computer.

| release time：2019.09.24 Source：

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The power adapter cannot be used normally due to the virtual welding of the power interface of the l