April 15, 2019 by keikeilaiy
First, if there is a problem with the original power adapter, it can't be repaired or it can't be repaired, you can use other adapters instead, as long as the output voltage and power are roughly equal. There is also a voltage regulator circuit inside the laptop, don't worry too much about the output voltage mismatch. In the repair, the first step is to prepare the tool. We need a multimeter, a screwdriver, and a welding tool.
Second, there are four plastic caps on the power adapter. Do not damage the adapter casing as much as possible. After the shell is damaged, electromagnetic radiation will be strengthened and the machine will be stable. If the shell is damaged, try to fix it. During the disassembly process, if the external power supply is not powered, you can try plugging in the battery. If the machine can start normally, there may be a problem with the power cord or the adapter. Open the appearance, open the shielding layer, it is best to first check the soldering feet, the naked eye can be observed, the circuit is intermittent, usually poor contact. Then use a multimeter to check if there is any problem with the power cord to simplify the maintenance.
Third, during the test, if the resistance pin is found to be soldered, and then soldered with a soldering tool, the power adapter is installed again, and the test is started. The problem is solved. It should be noted that if there is a problem with a certain capacitor during the detection process, you can purchase a capacitor with a model and capacity (price is about 5 yuan), then solder the defective capacitor and solder the new capacitor. Just fine. If you find that there is a problem with the IC power chip, you can solve it in the same way. Of course, since the IC chip is definitely one of the most important electronic components in the power adapter, the capacitor is too complicated.
Fourth, the optional power adapter in the repair process, because the current power adapter has a large number of patch components, once the component is out of order, the maintenance is more difficult. The power of the power adapter is also increasing day by day, so that the test of electronic components is getting bigger and bigger. If the quality of the electronic components used in the power adapter is not good and the PCB is improperly wired, it is likely to increase the probability of failure. Therefore, the purchase of a good quality power adapter is very helpful for the stability of the notebook.
Fifth, check the capacitor resistance and inductance for any problems. If the capacitor has a bulge, it is best to replace it in time to avoid potential hazards.
April 9, 2019 by keikeilaiy
March 26, 2019 by keikeilaiy
owadays, the car charger has been widely used in most car owners. However, the quality of car chargers is uneven, and many car owners do not know how to use them correctly. However, if there is a problem with a small car charger, it will also bring A huge loss. The car charger converts the 12V voltage of the car cigarette lighter socket into a 5V USB voltage, which is used to charge the mobile phone and other devices. Its characteristics are small power consumption, simple and convenient, and low price. Although this configuration is simple and easy to use, it can cause damage or even danger if it is not properly operated.
Precautions for use
Matter 1: It is best not to insert the car charger or connect the power supply to the mobile phone before starting the vehicle, so as to avoid the unstable voltage generated by the vehicle starting to damage the charger and the mobile phone.
Matter 2: When the car charger has been used for a long time, do not use harsh chemicals, cleaning agents or strong detergents to clean the charger. Wipe it with a wet tissue and dry it to avoid damage.
Matter 3: Pay special attention to not throwing, landing, knocking or vibrating the charger at random during use. When the summer vehicle is exposed to the sun and the temperature inside the car exceeds 45 degrees Celsius, do not use the charger for a while, otherwise the circuit board inside the car charger will be seriously damaged.
Matter 4: The car charger is an electronic device. During the use of the car owner, do not put it in a humid environment for a long time to avoid different degrees of corrosion or oxidation of its internal electronic components. If you accidentally spill water on the charger while driving, remove it immediately and wipe it dry to avoid damage to the board.
Matter 5: After the vehicle is turned off, the car charger should be unplugged. If it is plugged into the power connector for a long time, the contact between the two may be corrupted and difficult to remove. Although 80% of the vehicles are powered by the cigarette lighter after the vehicle is unplugged, some of the car's cigarette lighters are continuously powered. Therefore, it is necessary to pay attention to purchase a car charger with overload protection function, because when the output current is too large and exceeds its normal output value, the life of the charger component will be shortened or the temperature will be too high to cause damage or even combustion.
Select products with output currents above 1A
The input voltage of the car charger on the market is basically 12V~24V, the output voltage is 5V, and the output current is about 1A~4A. However, some "three no" or "cottage" products generally have a phenomenon of charging current imaginary. If you are charging while navigating with your mobile phone, the inferior charger will not only provide normal charging but will also cause the battery to continue to drop.
Choose regular licensed
To buy products that have been certified by regular manufacturers, do not buy or use three products, otherwise there will be no complaints about quality problems. In particular, you can't buy cheap brands. At present, the price of car chargers for domestic mainstream brands is around 20-100 yuan. When buying, remember to buy licensed products marked with Chinese characters.