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Hello everyone, today we will learn how to repair the failure of Apple laptop not charging

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No charging fault means that after plugging in the adapter,

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the battery cannot be charged normally, and the battery power will become lower and lower

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Usually there are three phenomena

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The first one is that the battery is not detected in the system and cannot be charged

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The second type is that the battery power information can be recognized in the system,

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but the battery cannot be charged

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The third is that the system shows that it is charging, but it cannot be charged,

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and the battery power is getting lower and lower.

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These 3 are the more common faults of no charging

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Among them, there are reasons for the battery itself,

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and there are also problems with the circuit of the mainboard

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Our maintenance ideas have different processing methods for the three types of failures

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First of all, the first kind of failure,

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the battery cannot be recognized in the system,

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usually caused by the battery damage

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If the battery itself is normal and can be used normally when installed on other identical machines,

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then the cause of the battery is ruled out

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You can check whether the battery insertion identification signal on the mainboard is normal

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For the second type of failure, the battery power can be identified in the system,

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but it cannot be charged,

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usually because the wrong adapter is used or the adapter is damaged,

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or it may be that the EC cannot recognize the power information of the adapter, resulting in no charging

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For example, there is an indicator light on the power head

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Under normal circumstances, the EC can complete the communication with the adapter,

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and this light will be on

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When the green light is on, it means that the charging has been fully charged,

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and the communication between the EC and the adapter is normal

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If the light is off, it means the communication between EC and adapter is interrupted

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If the light is orange, it means it is charging

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Of course, there are also reasons for the battery itself that cannot be charged normally

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For the third type of failure, it shows that it is charging, but it has not been fully charged,

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which is usually caused by a failure of the charging circuit or an EC problem

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This problem is more complicated,

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first we have to rule out the cause of the battery

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Some batteries have been left useless for a long time,

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resulting in loss of capacity and failure to charge

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We need to replace the battery for testing

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Some batteries have not been used for a long time,

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and it will be displayed as charging after being installed

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After charging for many hours, it will gradually charge in slowly, which is also an activation process

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This is rare

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Generally, the battery is useless after a long time, and the capacity is invalid

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It is recommended that you replace the battery

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We can replace the charging chip, the upper and lower tubes of the charging circuit

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Focus on checking whether the charging current detection circuit is disconnected

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Let's take a look at this charging block diagram

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The charging chip is controlled by the EC

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This is the upper tube, this is the lower tube

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After the charging chip receives the charging command from the EC,

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it will output pulses to drive the upper and lower tubes to conduct,

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generate charging voltage and charging current,

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and charge the battery after passing through the charging current-sensing resistor

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The charging chip will detect the charging current in real time and feed back the charging current to the EC

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EC will adjust the charging current in real time according to the charging current and battery power

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If the current detection circuit is disconnected, or the resistance of the circuit changes,

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it will cause the display to be charging but not fully charged

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The charging chip is damaged, the communication between the EC and the charging chip is abnormal,

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or the communication between the EC and the battery is abnormal,

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and the battery power information cannot be obtained correctly,

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which will cause this failure

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For this kind of failure, you can replace the EC, or re-flash the EC program

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For Apple's EC, we generally have no way to flash the EC program,

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we can replace the EC directly

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Ok, this is the repair of the Apple laptop no charging fault