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Hello everyone, today we are going to learn about the mainbaords A1990, A2289

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A1990 mainboard configuration is relatively high,

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using Intel Core processor

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There is a PCH here, which is a custom PCH made by Apple

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It comes with an independent graphics card, known as a GPU

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This is the video memory,

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and this right next to the CPU is the memory

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There are 16 memory chips, 8 on this side,

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8 on the back, 16 memory chips

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This is the T2 chip, which is integrated with the EC

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There is no BIOS on the mainboard with the T2 chip

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The chip next to T2 is called the power chip, also known as PMIC,

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which outputs PWM or LDO power supply and so on

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It's basically to provide conditions to work on this T2 right here

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The power supply inductors surrounding the CPU and graphics card

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power supply to the CPU and graphics card

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It has four hard drives

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This is a hard drive, this is a hard drive,

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and two hard drives on the back,

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so there are four hard drives

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It doesn't have a master chip,

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it's integrated inside the T2 chip, so it's very powerful

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There are 4 empty pads, which are also used for hard disks, but they are not installed here,

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because there are several versions, only the version with higher configuration will be installed

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This is a Lightning chip that manages the Type-C interface

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This is also a Lightning chip

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Over here is the power supply chip for its independent graphics card, which is a PWM controller

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Here is a PWM controller powered by the CPU

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This kind of graphics card and CPU power consumption is relatively large,

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there is no way by the small power chips to provide them with working conditions,

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can only use this high-power PWM circuit

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Here is a Wifi/ Bluetooth module, and on the back of it is its antenna

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On the back of the Type-C interface are two CD3217 and CD3215

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We also have a CD3215 on this side, one on the front, one on the back

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These chips break a lot

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Usually adapter does not boost,

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plug in adapter can not open the machine and other faults, mostly with this chip damage

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Take a look at the mainboard A2289

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In fact, the mainboard configuration and function are similar with the mainboards A2159, A2251

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It uses Intel processor

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Inside the shield next to the CPU are its memory chips,

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two on the front and two on the back

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These two white ones are solid-state drives,

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and this is also a solid-state drive

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There are four solid-state drives

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The main control chip of the hard disk is integrated inside the T2 chip

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The working conditions of the T2 chip are provided by the power chip next to it

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This is a PMIC, power management chip, integrated with multiple power supplies,

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which are needed by the CPU

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Memory power is usually this

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There's a Wifi/ Bluetooth module with an antenna port on the back

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There is a lightning chip here in the Type-C interface,

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and next to the lightning chip is the CD3215

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This is CD3217, we have one on this side,

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so we have one on the front, and one on the backc

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It has only two Type-C interfaces, which are wired into this position

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This is the screen cable port

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Ok, this is the introduction of the mainboards A2289 and A2159