As one of the best-selling smartphones in the market, the Xiaomi Mi MIX 2 has made many improvements on its internal design and material. The teardown of the phone is not difficult. Now, let’s start the teardown on the Mi MIX 2.
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The phone’s SIM card tray design is in a quite tight layout, and no particles can be found in the SIM card tray.
Utilize the pick and suction cup to expand the seam between back case and body.
The newly added sealant doesn’t have good viscosity.
Then open the back case. But the back case can’t be completely separated from the phone because the ribbon wire of fingerprint reader is still connected to the motherboard.
The main cover has been removed successfully. It adopts metal injection molding process, and the gold printed antenna has been designed into the plastic layer.
The antenna’s number has been increased owing to the enhancement of communication capability. Xiaomi Mi MIX’s surface is covered with NFC antenna, while the Xiaomi Mi MIX 2’s NFC antenna has been removed to the back case. The LED flash the Xiaomi Mi MIX adopts on the back has been designed on the Mi MIX 2’s main cover. In this way, LED flash’s failure resolute from poor contact can be avoided.
The Xiaomi Mi MIX 2’s connection method to the motherboard is different from its predecessor’s because of vibrating earphone. It connects to the motherboard via bridge circuit on the main cover. The metal material the MIX 2’s main cover adopts is thinner than the plastic material MIX features. With such design, the phone can bring better electrostatic shielding.
Compared with its last generation, the MIX 2 has made some adjustments on motherboard connector’s layout. The main changes include that the phone has replaced piezoelectric ceramics components with vibrate earphone and liner vibrator has superseded rotor vibrator. Compared with rotor vibrator, the linear vibrator acts with the swifter response and creates lower noise. The phone has canceled earphone port, which can improve sealing effect.
After removing the back case, the MIX 2’s internal design can be seen. It is obvious that the phone continues the MIX’s design and adopts three-stage layout. It has a new design on loudspeaker structure. Its battery doesn’t occupy much space since its motherboard has occupied much.
The MIX 2 has continued the MIX’s design on the back. But it adds double-sided tap around the phone not only to avoid the MIX’s loose problem but improve sealing effect. Personally speaking, it will have great improvements both on ergonomics and appearance if the phone’s back adopts curved surface design like the Note series.
The analysis on the back case is over. Power the system off first before continuing the teardown.
Then remove the motherboard.
The motherboard has low utilization of space on its front part, which continues the MIX’s feature, top part in particular. The component density, as a whole, is low. That’s the reason for two phones’ large motherboard.
The MIX’s utilization of motherboard’s space is a mess, while the MIX 2 has slightly improved on it. Material for cooling on the shielding case is covered with metal cooling paste. The MIX adopts S-shaped thermal silica on the thermal conductive paste, while the MIX 2 uses thermal silica gel. With such change, the MIX 2 has certain improvement on heat dissipation effect.
Here is the whole device without the motherboard.
Take out earphone on the top. The earphone looks the same with the Mate 10’s.
This vibrator is not big, but it is thicker than common rotor vibrator.
The teardown of the top components is basically over. Now, remove the fixed screws at the bottom.
Although two phones’ loudspeakers are from AAC, the MIX 2’s loudspeaker has made some changes in its structure. But there is no big difference between their sound qualities.
Remove the deputy board. We can find that data port has adopted sealing design, and its front part is covered with a thick rubber ring, which aims to enhance sealing effect.
The LED indicator is on the right, and the ambient light sensor is supposed to be on the left.
The front camera is mini, and its parameter is 500W. This camera is estimated to be the MIX’s camera model.
Then remove the battery. The battery is fixed by two easy-to-pull stickers. The sticker is easy to break. After we take the picture, the sticker gets broken, and it drops under the battery, I suggest pulling out the sticker slowly at slant 60 degree upward.
The MIX 2’s battery is provided by SCUD. The battery’s capacity is 3,400mAh, while the MIX’s battery capacity is 4,00mAh. It supports 18W fast charging, which is far from reaching the standard that terminal device’ fast charging reaches. After all, current flagships sport the battery which supports over 20W fast charging. Of course, I refer to Android phones exclude iPhone.
Easy-to-pull sticker still remains on the back.
There are the main camera and front camera. The main camera is much bigger than the front camera since it supports OIS function.
After removing the metal heat dissipation paste from the motherboard’s back, the Hynix memory chip can be seen. It can be inferred that the Snapdragon 835 chip is placed under it.
The other small one with thermal silica is PM8998 power management chip.
What left on the back is welding shielding case, so I stop the teardown on the back. Now, let’s look at its front part, I can only remove a shielding case.
Close up the picture of the front of the motherboard.