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Hello everyone, today we will learn about the common problems of these models of Apple laptops

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Apple's A1502, A1398, A1425 models

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You can hear a "boom" sound when you turn it on, but there is no display,

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the screen is dark, and the external display is normal

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In this case, generally check the screen cable first,

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it may be that the screen cable is not plugged in properly,

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or the contact is poor, you can re-plug the screen cable,

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or clean the screen cable interface

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It is also possible that the screen cable is damaged and needs to be replaced

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The screen lines of these three models are common

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The faults of screen line damage occur the most

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Generally, re-plug the screen cable,

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if not, replace the screen cable

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The A1398 model has two version numbers,

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and their drawings are exactly the same

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They have a common failure phenomenon,

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the power is turned off when the system is turned on, the power is not lost when the system is not turned on,

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and the machine cannot be turned on with the battery alone

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Like this kind of failure, generally repair the battery mode first, so that it can be turned on

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The model of the battery is A1618

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After entering the system, if there is an exclamation mark on the battery,

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it should be that the battery itself is damaged

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This machine will power off without a battery installed

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The video card power supply chip ISL62882C of this machine is also a common problem,

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which is easy to be damaged and will cause power failure

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A1502 freezes, fan spins wildly

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For this kind of problem, generally check the peripherals first.

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Such as small power boards, cameras, touchpads, keyboards, batteries, etc.

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Then check the device connected to the I2C bus, or replace the EC

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For laptops before 2017, after directly plugging in the adjustable power supply,

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if the standby current is around 200mA and there is no standby power supply

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This is usually a short circuit at the common point.

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We only need to find the short-circuited components,

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or find the fault point and fix it