"As one of the few super large screen mobile phones on the market, Xiaomi Max three How many special designs have been made for large batteries? Without much to say, we immediately began to disassemble for everyone.
Disassembly highlights:
1、6.9 Inch giant screen
2、5500mAh High capacity battery
3. Stereo dual power amplifier design
4. Mass heat dissipation design
millet MAX three Configuration list:
SOC: Qualcomm Xiaolong six hundred and thirty-six processor 14nm Process 1.8GHz dominant frequency, Adreno509 Graphics Processing Unit
Memory: 4GB RAM + 64GB ROM ， 6GB RAM + 128GB ROM Optional
Screen: six point nine inch HD full screen
Front: eight hundred Megapixel camera, supporting soft light selfie
Post: one thousand and two hundred Megapixel + five hundred Megapixel camera double led fill-in light
Battery: 5500mAh Lithium polymer battery, support reverse charging, support QC3.0 Fast charging protocol.
Features: six point nine Inch full screen, 5500mAh Super large capacity battery, supporting reverse charging.
Preliminary disassembly:
1. Millet Max three Instead of the fixing with the hot melt adhesive, classic screws and buckles are used for fixing. take out SIM Card slot and remove the bottom two After the screws are, pry the rear housing along the gap of the rear cover.
millet Max three Equipped with a large number of evenly distributed buckles, and the rear shell is relatively thick, the edge of the rear cover passes through CNC The edges and corners are also thickened, so the closure of the rear cover is very good.
In terms of structure, Xiaomi Max three The standard three-stage structure is adopted. Because the high-capacity battery occupies a very large space, it seems that the proportion of both the main board and the auxiliary board is relatively small.
2. The cover of the main board is fixed by screws, and a cover plate for connecting the earpiece and the main board is pasted on the front of the cover plate PCB Circuit board.
Close up of motherboard.
3. The battery is fixed on the inner support through two pull glue, which is relatively convenient to disassemble. The battery capacity is 5500mAh ， support QC3.0 Charge quickly.
4. The microphone is installed on the rear cover plate and connected with the auxiliary board through contacts.
5. The antenna band is located at the top and bottom edges of the metal shell. This design not only improves the heat dissipation performance, but also reduces the thickness of the motherboard.
6. In terms of cameras, the rear dual cameras are one thousand and two hundred Megapixels and 500 Megapixel camera. The main camera sensor is SAMSUNG S5K2L7 ， aperture F1.9 ， The number of blades is six Film. The aperture of the auxiliary camera is the same F1.9 ， The number of blades is four Film. Front Camera is eight hundred Megapixel, sensor model S5K4H7 ， F2.0 Aperture, 4 blades.
Analysis of main board components:
millet Max three The motherboard design is still more conventional, and the motherboard volume is not reduced due to the placement of high-capacity batteries.
positive:
Blue: qualcomm-pm660l-power management chip
Red: qualcomm-sdr660-rf transceiver chip
Green: SK Hynix-h9hp52acpmmd-4gb memory + 64GB flash memory chip
Yellow: qualcomm-sdm636-qualcomm snapdragon 636 eight core processor
White: qualcomm-wcn3980-wireless / Bluetooth chip
Red: Qualcomm-pm660-power management chip
Yellow: ti-tas2559-audio chip+
Blue: skyworks-sky77925-21-rf analog chip
Green: skyworks-sky77643-31-power amplifier chip
six point nine Inch large screen:
As one of the biggest highlights of the whole machine, Xiaomi Max three Figure 6.9 18:9 inch screen TFT for Full screen, high pixel density 352PPI 。 The screen proportion is 80.4% ， The width of the peripheral black edge is about 4.4mm 。
The screen model is tl069fdxp01-00 ， The screen module is provided by Tianma.
The screen and the inner support are fixed by fixing glue, and a large amount of foam is pasted on the inner support to improve the stability. At the same time, the screen soft board device is protected by yellow adhesive tape, forming a stable internal structure.
The screen soft board device adopts the sink top GR917D , It applies to five point five Inch~ seven Inch screen, support ten point touch, whether it is one-way multi-point or traditional double-layer fourteen A gesture wakes up.
receiver & Stereo dual power amplifier:
As mentioned in the preliminary disassembly, in order to place the super large capacity battery, the area of the sub board is inevitably compressed, so the size of the loudspeaker on the sub board also needs to be compressed accordingly.
As we all know, the size of speakers will directly affect the sound quality. On this premise, Xiaomi adopts the design of stereo dual power amplifier, which not only makes up for the defect that the volume of the speaker is compressed, but also brings a better listening experience.
The secret of stereo dual power amplifier is hidden in the earpiece on the top of the mobile phone, which also has speaker function, so that Xiaomi Max three It can realize the stereo effect of dual power amplifier.
In order to make the earpiece have the function of speaker, the design of this earpiece is relatively thicker and larger than the general earpiece, so this earpiece adopts PCB Embedded design of board hollowing out.
Large area heat dissipation material:
six point nine Inch 2K In terms of screen power consumption, it is bound to be larger than that of small screen mobile phones, and high power consumption will inevitably lead to higher calorific value than ordinary mobile phones. So Xiaomi Max three In addition to being equipped with super large batteries to solve the endurance problem, a lot of efforts have been made on the heat dissipation of the fuselage.
When the back cover is disassembled, it can be seen that a very large area of graphite sheet extends from the main board to the battery. In addition, the whole main board is covered with a metal plate attached with copper foil. This series of measures provide a good guarantee for heat dissipation.
There is a blue heat dissipation silica gel at the flash position of the rear cover corresponding to the main board cover, which should be used to heat the camera module.
In addition, the positions of the internal support corresponding to the motherboard processor and flash memory chip are also coated with heat dissipation silicone grease.
Group photo of complete machine parts:
We give Xiaomi Max three Disassembly score:
millet Max three Bom Table:
millet Max three The selling price is RMB one thousand six hundred and ninety-nine Yuan.
from Bom As can be seen from the table, Xiaomi Max three The highlight of this phone is undoubtedly the large screen and high-capacity battery. Because of this, the cost price proportion of screen and battery has also increased accordingly, so that the price proportion of main control chip will be slightly lower than that of other models.
Based on the consideration of positioning, Xiaomi Max three It is produced by Tianma TFT Screen. Tianma Microelectronics Co., Ltd. is a screen manufacturer with many years of R & D and production experience in China one thousand nine hundred and eighty-three It has been established in one thousand nine hundred and ninety-five It was listed on Shenzhen Stock Exchange in.
In terms of technology, Tianma has experienced many years of development and has many production lines of panels of different materials for many days. Compared with Samsung, sharp LG For such international first-line screen manufacturers, there is indeed a gap in the production and R & D technology of Tianma, but with high cost performance and stable supply capacity, the screens produced by Tianma have long been widely used in medium and low-end smartphones of major brands.
This time Xiaomi Max three Chose Qualcomm Xiaolong six hundred and thirty-six Processor instead of Qualcomm snapdragon, the most popular midrange model six hundred and sixty ， It has also been subject to a lot of controversy.
It is understood that Qualcomm Xiaolong six hundred and sixty The estimated price of processor components is twenty-five point four three Dollars, that is, if you replace the processor with Qualcomm snapdragon six hundred and sixty The cost of components will increase by about three point four three Dollars. Coupled with other factors that need to be coordinated in all aspects, if you want to keep the profit unchanged, the retail price of the whole machine is likely to increase to a higher level, which is obviously contrary to Xiaomi's consistent concept.
So this time Xiaomi Max three Xiaolong with slightly lower performance was selected six hundred and thirty-six ， It's a decision to balance the price.
The reason why the rear camera module adopts Samsung instead of Sony is not only the cost factor, but also Xiaomi Max three Own product positioning. Look at several mobile phones currently sold by Xiaomi, except Xiaomi eight Except for the youth version, Sony is used for the rest IMX363 The models of camera modules are all in two thousand and five hundred A mobile phone with a location of more than yuan.
Compared with Xiaomi eight Youth Version, due to Xiaomi Max three The release time of Xiaomi is earlier, and its main target is the group dominated by large screen entertainment, so Xiaomi chose the Samsung camera module with relatively lower cost.
Summary:
millet Max three The standard three-stage structure is adopted, and it is not fixed with hot-melt adhesive, so it is not difficult to disassemble as a whole.
The large screen mobile phone is difficult to "control" with one hand, which will increase the probability of falling to some extent. Therefore, Xiaomi Max three Some targeted treatments are carried out at the edges and corners of the rear cover to enhance its ability to prevent falling and impact.
There are not many innovative designs inside the mobile phone, but the design direction is very clear, which is to accommodate that piece 5500mAh Therefore, the area of other components can only be relatively compressed. At the same time, the heat dissipation measures of various materials and large-area coverage are also millet Max three A very special place inside.
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