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Charger repair and maintenance

source:Charger     Popular:adapter     release time:2021-04-12 09:53:13     Article author:sznbone    

  Charger repair and maintenance

  1. Repair

  (1) The power indicator light is on, and the charging light is off, so there is no way to charge. Most of the problems of this kind of failure are caused by abnormal operation or failure of the charger switch to oscillate and block the road. After the charger is disassembled and overhauled, it can be found that the switch tube VT2 and resistor R6 are damaged, and the fault problem can be solved by only replacing the damaged switch tube and resistor. In general, because the mobile phone lithium battery charging circuit has a low operating voltage, the probability of component damage is low, that is, the probability of damage to the circuit after the secondary of the switching transformer is low, and it is generally not damaged, and it is not the key to fault detection.

Charger repair and maintenance(图1)

  (2) The indicator shows under normal conditions, but there is no way to charge or the charging efficiency is low. The occurrence of this kind of failure problem is generally that the triode is damaged, and the failure can be eliminated by replacing the new triode. If the transistor does not fail, the voltage across the capacitor (100μF/16V) must be measured. Under normal circumstances, the DC current is roughly equal to the parameter standard (about 8.5V). If the voltage is normal, check the resistance or integrated block, and analyze whether the integrated block data meets the parameters under normal conditions. If the voltage is low, measure the secondary output voltage of the switching transformer (normally around 5.5V AC). If the voltage is normal, it means that the capacitor and rectifier diode are damaged; if the voltage is low, the switching transformer and the previous components may be damaged.

  2. Maintenance

  (1) Cleaning. Because the charging port is likely to accumulate dirt, some users have the habit of regular cleaning. At this time, you should use a damp cloth or an anti-static cloth instead of a normal dry cloth, otherwise static electricity is likely to break down some circuits.

  (2) Waterproof and moisture-proof. Although many mobile phones support IP68 and IP6X dust and water resistance, the charger is not waterproof. Accidental water intake or prolonged exposure to humid air will cause different degrees of oxidation and corrosion problems in the electronic components in the charger.

  (3) Anti-drop and anti-vibration. The charger is very fragile, and the internal components are very delicate, so avoid dropping or violent vibration, or it will damage the internal circuit board.

  (4) Anti-cold and anti-heat. During the charging process of the charger, some of the electrical energy will be converted into heat (loss). At this time, the charger will heat up. If the charging environment temperature is too high, it will further shorten the life of the charger and cause serious damage. Do not place the charger in a cold area, because the temperature rises during the charging process and the surrounding air is too cold to generate moisture, which may cause corrosion or short circuit of the circuit board.

  (5) It is strictly forbidden to contact with strong chemicals. Do not clean the charger with only strong chemicals and detergents. If you want to clean the surface, you must carefully wipe it with cotton dipped in a small amount of absolute alcohol.


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