Understand mobile phone charger maintenance methods and troubleshooting
Apr 07, 2018| Static electricity when cleaning. Clean the charger and charging port regularly. When cleaning, use a damp cloth or an antistatic cloth. Do not use a dry cloth (static charge)!
Waterproof and moistureproof. As an electronic product, water inadvertently or exposed to moist air for a long time without use will cause various degrees of corrosion or oxidation of its internal electronic components.
Fall and shock. The mobile phone charger is actually a fragile part, and the internal components cannot withstand the beat. In particular, prevent accidental landing during use. Do not throw, beat or shake the charger. Rough treatment of the charger will destroy the internal circuit board.
Cold and heat-proof. Do not place the charger in an area where the temperature is too high. High temperatures can shorten the life of electronic devices, destroy the charger, and deform or melt some plastic parts. Do not store the charger in too cold places. When the charger is working in a cold environment, when the internal temperature rises, moisture will form inside the charger and damage the circuit board.
Strong chemical. Do not use strong chemicals, cleaning agents or strong detergents to clean the charger. Remove the appearance of the charger stains can use a small amount of alcohol to wipe with a small amount of alcohol.
1. After the battery and power supply are connected, the power indicator and test indicator light, and the charging and full indicator light is not on, no voltage output, and the battery cannot be charged.
Analysis and maintenance: This type of failure is mostly caused by the charger switching oscillation circuit not working. In the actual repair process, it was found that the switch tube VT2 and the resistor R6 were damaged most. Under normal circumstances, the operating voltage of the charging circuit of the battery E is relatively low, and the probability of damage of its components is not large, that is, the probability of damage of the circuit after the secondary of the switching transformer T1 is not very large.
2. After the battery and power supply are connected, the status indicators show normal, but they are not charged or charge for a long time.
Analysis and maintenance: This type of fault is caused by damage to the transistor VT3 (8550). After replacing it with a normal pipe, the fault can be eliminated. If the triode VT3 is normal, then use a meter to measure the voltage across the capacitor C3 (100μF/16V), which is about 8.5V DC. If the voltage is normal, check resistor R7 or IC1. The normal parameters of each pin of IC1 are shown in the attached table. If the voltage is low, then measure the secondary output voltage of the switching transformer T1, normally about 5.5V AC. If the voltage is normal, the capacitor C3 or the rectifier diode VD3 is damaged; if the voltage is low, the transformer T1 and its preceding components should be checked.