Teardown and Reassemble Redmi Note 4G (Dual Sim)! Device from 2014! - General - Xiaomi Community

Hi Xiaomi Fans!
In this article I want to show you the disassembly and assembly of the smartphone Xiaomi Redmi Note 4G Dual Sim. The smartphone is very old, one of the first Redmi Note series.

Specifications:

General

Manufacturer	Xiaomi
Model	Redmi Note 4G
Other names	Hongmi Note 4G, Red Rice Note 4G
Year	2014 August
Operating system	Android 4.4
Accum Capacity (mAh)	3.200

Dimensions

Dimensions (WxHxT, mm)	78.7 x 154 x 9.44
Weight (g)	187

CPU/GPU

Processor Type	Qualcomm Snapdragon 400 MSM8928
Clock Frequency (MHz)	1.200
Video accelerator	Adreno 305

Memory

RAM (MB)	2048
ROM (GB)	8

Communications

Phone	(850, 900, 1800, 1900), LTE (1800, 2100, 2600), UMTS (850, 900, 1900, 2100)
Bluetooth	4.0
Wi-Fi	802.11a, b, g, n, ac. 2.4/5Ghz
Other	2G (GPRS, EDGE), 3.5G (HSDPA, HSDPA +, HSUPA, HSPA), 3G UMTS / WCDMA, GPS, GLONASS

Display

Screen size	5.5
Screen resolution (px)	720 x 1280
Screen Type	IPS

Camera

Camera rear (MP)	13
Autofocus, Photo flash	+
Camera front (MP)	5

A few photos and descriptions of what you can see:

All device parts)

Logical bord

Power controller Qualcomm PM8916 -The PM8916 device integrates all wireless handset power management, general housekeeping, and user interface support functions into a single mixed-signal IC. Its versatile design is suitable for multimode, multiband phones, and other wireless products such as data cards and PDAs.

High-level PM8916 functional block diagram

Since the PM8916 device includes many diverse functions, its operation can be understood better by studying the major functional blocks individually. Therefore, the PM8916 document set is organized by the device functionality as follows:

Input power management
Output power management
General housekeeping
User interfaces
IC interfaces
Configurable pads – either multipurpose pads (MPPs) or general-purpose input/output (GPIOs) – that can be configured to function within some of the other categories.

PM8916 device features

Wi-Fi, Bluetooth - WiFi 802.11b/g/n, Bluetooth 4.0, HSPA+.

Hynix Chip - RAM memory 2Gb.

Qualcomm Snapdragon 400 MSM8928 - high-performance SoC for smartphones, the maximum frequency of which reaches 1200 MHz. The chip has four ARM Cortex-A7 processor cores, making it much more efficient for multitasking than dual-core solutions. It is based on the architecture of Harvard, the second-level cache is 1 MB for each core. Made according to the standards 28-nm process technology. The chip includes an integrated video card Qualcomm Adreno 305. It is ideally optimized for video acceleration, image creation, works with 1080p video. There is support for OpenCL and OpenGL ES 3.0, a 13.5 megapixel video camera, Bluetooth 4.0 and LPDDR2 or LPDDR3 memory.

Bottom fee

Touch Screen Controller MXT336S-A 336. Provides the ultimate interface for automotive touchscreens withsizes up to 7”.

Key Features	Benefits
Automotive qualified	AEC-Q100 qualified Temperature range of up to -40° to +105°C
High level of analog filtering	Support of Single layer shield less sensors
Unlimited, unambiguous touch	Multi-touch support up to 16 simultaneous touches
High SNR through high voltage drive	Enables gloved hand operation
Smart processing with integrated 32-bit	Embedded single and dual-touch gestures. Rejection of unintended touches such as a resting hand
Embedded post processing	Noise filtering. Improved EMI and ESD behavior
High scan speed	Up to 280Hz scan speed to support character recognition for in-host processing