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Fault detection steps of the power adapter!

source:power adapter     Popular:adapter     release time:2021-07-17 09:54:22     Article author:sznbone    

  The power adapter is a small and medium-sized electronic product that is easy to carry in daily life. This kind of machinery and equipment shows the same main parameters for products that must be charged by the battery. The transformer and its inverter circuit are formed, and the power adapter has two output methods. Generally speaking, it means the method of communicating AC output and DC output. Naturally, there will be different interface methods when there are different output releases. , Generally there will be plug-in wall and desktop type.

Fault detection steps of the power adapter!(图1)

  The types of power adapters can be roughly divided into two types:

  1. A simple transformer, some of which have the function of a voltage regulator tube, and the output is communication. This home appliance has an inverter circuit inside.

  2. Transformation regulator tube plus rectifier, the output is direct current. Such household appliances do not have an inverter circuit. Do not use one type of power adapter. Regarding the basic principles, it is nothing more than the two types of transformers and power switching power supplies. Naturally, it is also super cost-effective for capacitor divider circuits.

  Classified according to the interface: it can be divided into desktop type and plug-in wall; according to the type of output current: it can be divided into communication AC output type and DC output type. The general supporting facilities are in machines and equipment such as laptops, electronic computers, mobile phones, and home-installed IT machines and equipment.

  Power adapter failure test process

  First, you can check whether the power adapter or laptop battery is in good contact by flicking the power connector or battery. If it is abnormal, try to reinstall the power adapter or battery. Common fault conditions that will occur are deformation of the power connector or reduced ductility of the battery contact point.

  If the power supply or battery connector is good, you can use a digital multimeter to measure the output voltage of the power adapter or battery. The key is to check whether the output voltage is stable and whether the specific output voltage value is consistent with the power supply tolerance voltage. If the output is not stable or specific If the output voltage is too different from the product tolerance, the damaged power adapter or battery needs to be replaced.

  If the laptop power board, power adapter, and battery are all in good contact, then use the common disassembly and replacement methods to check whether the laptop power board is normal. If it is abnormal, it can be removed or repaired.

  If the inspection process shows that everything is normal, the notebook case must be opened at this time to check whether the power board and the motherboard are in good contact. If the power board and the motherboard are in good contact, it can be inferred that the common fault is on the notebook computer motherboard.

  If it is determined that the power board, main board, power adapter and battery are all normal, and other key components can be presumed to be damaged (common failures of the above power supply circuit), the key components should be replaced or repaired.


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