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

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A1706, A1707 and A1708,

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these models have a common problem of dark screen failure

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When the screen is turned to a 45-degree angle, it can be displayed normally,

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and it will not be displayed when it is turned a little further

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This is usually due to the repeated stretching of its backlight cable, resulting in disconnection

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The solution is to replace the backlight cable,

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or scrape off the surface layer of the cable,

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connect the broken parts with wires, and then apply a protective layer of green oil to cure

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But this repair method is easy to cause rework

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So we suggest that when you encounter this kind of failure,

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you can directly replace the backlight cable

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A1708's Wifi and Bluetooth cannot be used

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Mostly the Wifi Bluetooth module is damaged, or its working condition is not normal

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The solution is to first check the power supply of the Wifi module,

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PCIE bus, platform reset, and PCIE bus clock

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Most of it is caused by its power supply being pulled down,

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basically the Wifi module is short-circuited, and the Wifi and Bluetooth module needs to be replaced

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A1706 A1707 flooded, hard disk cannot be recognized

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For this kind of failure, we focus on checking each power supply of the hard disk

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Generally, the power supply chip of the hard disk is damaged

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or the power supply of the hard disk is disconnected

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The problem can be found by checking each power supply of the hard disk

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When the A1707 is only using the adapter, it can be turned on normally,

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and the screen will be dark after the battery is connected

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In this case, we first check the two dormant lid close switch signals, LID

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If the signal is normal, we check the working condition of the EC, or replace the EC

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The common point of A1706 is normal, the 3.3V deep sleep standby voltage is normal,

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the PM_SLP_SUS_L signal can be generated normally,

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and the deep sleep standby power supply can be successfully converted into

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PP3V3_SUS light sleep standby power supply,

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but a small power supply PP1V8_SUS of the power chip U7800 cannot be generated,

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which is a common problem

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It is usually caused by damage to the power chip U7800

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Our solution is generally to solder the power supply chip first

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U7800 is a common power supply chip on Apple laptops

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It integrates multiple power supplies inside

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If the chip cannot be repaired after soldering, you can replace the chip

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Let's take a look at the common problems of Apple A1534

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This laptop uses a very low-power version of the CPU, there is no cooling fan inside

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If the power-on current of this machine stops at about 500 mA,

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it is mostly because the CPU is soldered falsely or the CPU is damaged

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Our solution is to try to solder the CPU first

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If the problem cannot be solved, we will replace the CPU

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The 2015 A1534 cannot recognize the hard disk when it is turned on

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This is also a common problem

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The solution is to solder the CPU first,

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and then check the main power supply of the hard disk

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Its hard disk power supply chip is also easy to break

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The 2016 A1534 adapter does not boost the voltage,

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usually because the USB controller CD3215 does not send a POWER_GATE_EN signal to the charging chip

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Basically because the D3215's external program is corrupted

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The external program exists in this Flash chip, U3090

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There is also a reason that the U3100 itself is damaged

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So the solution is to flash the U3090, or replace the U3100 and U3090