Redmi K20 and Redmi K20 Pro are probably and understandably the most talked-about smartphones in recent days: the “2.0 flagship killer” of the new Xiaomi sub-brand stands out for a number of good reasons, including the full-screen front with the retractable front camera, whose mechanism, it seems, is made to last for quite a long time.
Like what was done by some other brands in unsuspected times, with its new flagship smartphone Redmi decided to put aside notch of any shape and size and various holes favored by a pop-up camera.
While on the one hand solutions of this type meet the favor of many users who want uninterrupted displays of sorts, on the other, since they are more mechanical parts, they bring as many users to wonder about their ability to last over time. In order to dispel any doubts of this kind. Recently, Xiaomi official released the disassembly of Redmi K20 Pro, so, let’s take a look.
Firstly, disassemble the back cover to see the obvious 3-segment structure. The upper part of the body is placed in the middle of the rear, and the front metal cover is a pop-up front lens. A heat-dissipating graphite sheet is at the bottom and an NFC antenna on the top are stacked above the middle battery compartment. The Redmi K20 Pro uses NXP’s latest generation SN100T NFC chip, which increases transaction speed by 30%.
Remove the screws and open the upper cover, you can see the internal structure of the main board, the left side of the chip is densely covered with heat-dissipating copper foil graphite, the middle triple camera module, laser focus, dual flash, on the right side, a pop-up front camera Lifting mechanism and spiral stepper motor.
The laser focus module can assist the rear camera to quickly focus, and the millisecond laser focus makes night shooting easier. Laser-assisted focusing also detects human faces, allowing the Redmi K20 Pro to focus quickly and accurately when shooting portraits; it also detects the intensity of ambient infrared light in real time, making the white balance of the photos more realistic.
The Redmi K20 Pro has a triple rear camera, the top 8MP telephoto lens enables 2x lossless optical zoom. The central 48MP Sony IMX586 lens, through the pixel four-in-one technology synthesis 1.6μm large pixels for casual shooting, effectively improve the amount of light in the night scene, dark light environment, greatly improving the quality of night landscape photos. At the bottom of the 13MP super wide-angle lens, 124.8 ° large viewing angle.
The battery compartment is designed with a quick release, teardown the upper and lower parts, you can slowly pull up the battery, easy to replace and reduce the violent disassembly to cause safety hazards. The battery capacity is 4000mAh, 15.4Wh. The manufacturer is Guanyu and Xinwangda. Even if it is used heavily, the Redmi K20 Pro can be used properly for one day. With 27W high-speed fast charge, it can be charged to 100% in 73 minutes.
The lower part of the body lifts the secondary PCB cover, and the upper side integrates a 0.9cc large external sound chamber, which is connected to the secondary PCB through 2 adjacent contacts. The physical 0.9cc large cavity is very rare on the flagship phone, which makes the Redmi K20 Pro louder.
It is worth noting that a small piece of PCB on the lower left side is connected to the main PCB through the RF coaxial line so that the middle frame becomes an antenna amplifier.
The RF coaxial cable connecting the main and sub PCBs on both sides of the fuselage is broken, and the screen fingerprint connector can lift the sub PCB. It can be seen that since the mechanism of the pop-up camera occupies a lot of internal space, the card slot of the phone is not designed on the side of the body, but on the sub-PCB, and the bottom of the fuselage is open. The SIM card tray supports dual Nano-SIM cards with a sealed that is dust and splash resistant.
In addition, the bottom place the USB Type-C interface is treated with a sealing rubber ring at the edge, which can protect from splash and dust. The contact position of the Type-C interface with the motherboard is glued, dustproof and corrosion resistant.
By removing the secondary PCB, you can see the latest gene of screen fingerprint module from Huiding Technology. The photosensitive area is increased by 100% compared with the previous gene and the single sampling signal is increased by 40 %. In addition, Redmi K20 Pro has been specifically tuned in software algorithms and unlocking experience.
Through the parallel computing of DSP, dynamic adjustment of fingerprint area brightness, cyan gradient spot and many other optimizations, the unlocking speed and detection accuracy of Redmi K20 series have been obtained. Significantly improved the unlock success rate in extreme environments such as low temperature, dry fingers, and strong light environments.
In the main board, the front camera connector, the under-screen optical connector, and the RF coaxial cable are sequentially cut off to open the main board. The bottom of the main board is covered with a large area of irregular copper foil, and the back side is stacked with 8 layers of the graphite heat sink. The 8-layer graphite can greatly improve the horizontal soaking capacity, allowing the CPU’s single point of heat to quickly spread to the entire motherboard for heat exchange with the outside world. Compared with the traditional single-layer graphite, heat dissipation efficiency is increased by 650%.
The metal shield on the front and back of the main board is open-ended, the regular thermal silica gel is attached to the front side, and the irregular thermal conductive gel on the back side facilitates the rapid discharge of heat from the components inside the shield. The front layer of 8 layers of graphite, thermal silica gel, backside thermal gel, copper foil graphite together constitute the stereoscopic heat dissipation structure of Redmi K20 Pro.
The reverse side of the motherboard is Qualcomm PM855 power management chip, pop-up lens driver chip, Qualcomm WCD9340 high-quality decoding chip, and AKM Hall sensor. The Hall sensor and the positioning magnet on the front camera can accurately sense the spatial position during the camera’s lifting process, making the lifting stroke control more precise.
The front panel of the motherboard is Qualcomm Snapdragon 855 platform and LPDDR4x memory stack, below is UFS 2.1 flash chip. The large-voltage Smart PA on the right side is equipped with a 1217 ultra-linear speaker and a 0.9cc large-volume sound chamber for a full-bodied volume.
Below the motherboard is a down-screen light sensor that senses ambient light through the AMOLED screen.
The pop-up mechanism of the front camera, the spiral stepping motor is connected with the front camera through the transmission rod, and the sliding guides of the front camera are integrally formed on the middle frame by CNC, which is better than the assembled guide rail used by other pop-up camera phones. Higher processes are more complicated.
Regarding the issue concerning the resistance and the ability to last in time of the retractable camera of Redmi K20 Pro, the Chinese manufacturer has also provided specific measures to protect it from falls and pressures. As for the protection in case of accidental fall of the smartphone, the mechanism, and the software intervene to make the camera retract quickly and prevent it from being damaged. In particular, the three-axis gyroscope takes care of detecting the fall, the closure takes place within 100 ms and internally there is a spring protection device.
In the same way, in the case in which the user exerts pressure on the camera while it is open, spring devices, magnets and a hall calibration chip (a Hall effect sensor, which takes care of detecting the flow variations) come into play. of the magnetic field) to detect these movements and protect the mechanism. The two magnets mentioned move when the camera is raised and retracted, the Hall effect sensor practically records the strength of the magnetic field corresponding to the two positions of the magnets and in this way makes it possible to detect any distortions so that the camera is returned for protection.
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