Xiaomi Mi Note 3 comes with a 5.5-inch full-HD (1080×1920 pixels) display with a pixel density of 403ppi and a 94.4 percent NTSC color gamut. The phone is powered by a Snapdragon 660 SoC clocked at up to 2.2GHz coupled with 6GB of LPDDR4x RAM. It packed a dual rear camera with a 12-megapixel sensor coupled with a wide-angle lens, f/1.8 aperture, and 4-axis optical image stabilisation, and the second 12-megapixel sensor coupled with a telephoto lens, and an f/2.6 aperture. The camera offers 2x optical zoom, and PDAF. The front camera featured a 16-megapixel sensor with 2.0 µm pixels. The Mi Note 3 comes with 64GB or 128GB of built-in storage, with no expansion via microSD card.
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There is no screw securing the back cover, so we heat up the back cover for about 2 minutes with a heat gun.
Insert a card under the back cover. Slide the card along the edge to remove the back cover.
With the back cover removed, we can see the phone using a common motherboard + battery + sub-board of the three-stage design, the motherboard and sub-board connection via a soft cable. Compared to the other L type, the three-stage design can make the battery capacity larger.
Its motherboard uses a whole plastic cover plate to fix all kinds of connectors. In order to access the motherboard, we need to remove the plastic cover first.
Remove nine screws and uncover the graphite sticker. You can remove the plastic cover.