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This lesson is about how to repair the no charging fault

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The first step is to rule out the problem of the tail plug interface

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Of course, things like chargers, charging cables, tail cables and small boards must be excluded

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The charger and charging cable are easy to deal with

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Find a normal charger and charging cable to insert this faulty phone to eliminate it

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Damage to the jumper cable that connects the tail plug board and the motherboard will also cause no charging

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There is another kind, the tail plug connector is directly welded to the cable,

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this kind should also be ruled out

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The method of exclusion is to directly replace it

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After replacement, go to test whether the charging is normal

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If the charging is normal, it means that there is something wrong with these accessories, just replace these accessories

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If the fault persists after replacement, proceed to the second step

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The second step is to deal with the components corroded by water

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After the mobile phone is disassembled,

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observe the connector on the tail plug board and the tail plug board,

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the connector on the motherboard where the 5V power supply passes,

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and the overvoltage protection chip on the motherboard,

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because the 5V power supply needs to pass through the overvoltage protection chip

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We also need to observe whether there is obvious water corrosion around the charging chip

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If these connectors are corroded, they need to be replaced or re-soldered

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If the overvoltage protection chip and the charging chip are corroded by water, resoldering is required

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Test whether the charging is normal after re-soldering

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If it is still abnormal after re-soldering, you need to replace the chip

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If there is no abnormality in the above, and the components are not corroded by water,

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it is necessary to proceed to the third step

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The third step is to plug in the charging cable

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and measure whether there is a voltage of 5 volts around the charging chip

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If 5 volts can be measured on these capacitors around the charging chip,

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replace the charging chip directly

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If the voltage of 5 volts cannot be measured, it means that the overvoltage protection circuit is faulty,

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and the overvoltage protection circuit must be repaired

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That's all for this lesson