Here is an interesting article on the complete disassembly of the device in question.
Xiaomi Redmi Note 3 was launched in November 2015. It is a 5.5-inch touchscreen device with a 1080x 1920 pixel resolution and a 403 PPI display. The Redmi Note 3 is powered by an eight-core Helio X10 MediaTek processor with 2GB of RAM. The phone's 16GB of internal storage is not expandable. As for the cameras, the Note 3 has a 13-megapixel primary camera at the back and a 5-megapixel camera at the front.
Features
5.5-inch (1920 x 1080 pixels) Full HD IPS display, 178-degree viewing angle
Octa-Core MediaTek Helio X10 (MT6795) processor and PowerVR G6200 GPU
2GB RAM and 16GB internal storage, or 3GB RAM and 32GB internal storage
Android Lollipop based MIUI 7
Dual SIM
13MP f/2.2, rear camera with PDAF autofocus, dual-tone dual-LED es flash aperture, 1080p video, 120fps slow motion
As always, when a new phone comes on the market, people are curious about the internal components. Since the Note 3 is no exception, here's a teardown/disassembly to show you the inside and the parts inside. Here we can see which manufacturers have contributed to the production of each part, for example the fingerprint sensor comes from FPC (1022), while the camera comes from Samsung (S5K3M2 ISOCELL Sensor). The individual components have been better packed together, as we saw with the Note 2, so a heat conductive paste has been used in some places to avoid overheating.
Here are the pictures
The Redmi Note 3 is the first Xiaomi device to feature a unibody design in the Redmi Note series. We start the disassembly from the back. We started by opening the small slot next to the micro USB socket on the back.
At the back, the plastic parts at the top and bottom of the device are actually part of the back cover. When you take off the back cover, you will find a ribbon connector cable through which the fingerprint sensor connects to the motherboard.
The fingerprint sensor mechanism is glued to the backplate to prevent it from moving or rattling. The next step is to remove the 5 screws that hold the speaker unit in place. Before proceeding, disconnect the battery to prevent any possible short circuit or malfunction.
As the battery is glued down we used a heat gun to remove it. A 4000 mAh battery is included which is not user replaceable, unlike previous Redmi Notes.
We then removed the speaker unit, the ribbon cable, and the ribbon cable connecting the micro USB port and the speaker to the motherboard. The micro USB port is glued to the display.
We then proceeded to remove the motherboard, removing the removable socket ribbon cable and the fixing screws. This allows the removal of the top part.
The back cover can be removed by removing the ribbon cable. The front camera can also be removed at the same time. Above, you can see the 13MP f/2.2 primary camera with PDAF autofocus and dual-tone dual-LED flash and the 5-megapixel f/2.0 front camera.
Finally, the MediaTek MT6795 Helio X10 eight-core SoC, PowerVR G6200 GPU and MediaTek controller are revealed under the metal shield. Below you'll also find the full disassembly in video form. source: http://en.miui.com/thread-213150-1-1.html
