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Table of Contents
Related Manuals for Blu VIVO 4.8
Summary of Contents for Blu VIVO 4.8
- Page 1 BLU VIVO 4.8 Service Manual Page 1 of 24...
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Page 2: Table Of Contents
Contents 1. OUTLINE ....................... 3 1.1. Mobile Introduction ..........................3 1.2. Motherboard Components Distribution ....................5 2. SIGNAL FLOW AND FAULT ANALYSIS ............5 2.1. RF Part ..............................5 2.1.1. Block Diagram of the RF Section ..................... 5 2.1.2. Signal flow of the RF Transmitting Part ................... 6 2.1.2.1. -
Page 3: Outline
1. Outline 1.1. Mobile Introduction Product Hardware Definition MT6589 MT6320 PMIC Transceiver MT6167 Camera DSP/MMP SKY77590 RFPA Base Chip Set MT6628 MT6628 Audio YD145 CODEC&PA Samsung KMK8U000VM-B410 Memory Mxt224 TP IC 4.77" SGM3141BYD10G/TR Backlight driver Peripheral 8 million pixel CAMERA Configuration Memory card monopole... -
Page 4: System Block Diagram
CAMERA SKY77590 FM、BT、 MT6167 WiFi、GPS LCD&CTP YD145 MT6589 KEYPAD single CARD MEMORY PMIC MT6320 BATTRY System Block Diagram Page 4 of 24... -
Page 5: Motherboard Components Distribution
1.2. Motherboard Components Distribution 2. Signal Flow and Fault Analysis 2.1. RF Part 2.1.1. Block Diagram of the RF Section PA & Ant Switch MT6589 SKY7759 Transceiver MT6167 RF Block Diagram Page 5 of 24... -
Page 6: Signal Flow Of The Rf Transmitting Part
2.1.2. Signal flow of the RF Transmitting Part 2.1.2.1. Transmitting Path Maintenance Flow Chart of the Transmitting Issue: Page 6 of 24... - Page 7 （NO launch） Connect the PC and the phone with maintenance line, then making the phone into the RF state with META software Check Transceiver to see Check if IQ signals exist. Check the PA output see if there is RF signal in the path.
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Page 8: Signal Flow Of The Rf Receiving Part
2.1.2. Signal Flow of the RF Receiving Part 2.1.3.1. Receiving Path Components Receiving path is shown in the following figure: Maintenance flow chart of the receiving Issues： Page 8 of 24... - Page 9 No receiving Start the META software to connect the PC and the phone，making the phone into the receiving state. Signal generator is also adjusted to the correspond CH. And signal lines connected to the phone. 的同轴开关上。 Check Transceiver has Transceiver received signal? 号？...
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Page 10: Baseband Part
2.2. Baseband part 2.2.1 Block diagram of the Baseband part CAMERA SKY77590 FM、BT、 MT6167 WiFi、GPS LCD&CTP YD145 MT6589 KEYPAD SINGLE SIM CARD MEMORY PMIC MT6320 BATTRY Page 10 of 24... -
Page 11: Power Management
2.2.2 Power Management The power management module is PMU IC：MT6320. 2.2.2.1 Mobile power supply system DC-DC: LDO: Page 11 of 24... -
Page 12: Audio Section
2.2.3 Audio Section 2.2.3.1 Audio Codec Circuit This phone applies YD145 which is a class D and non-crack noise YAMAHA amplifier to drive speaker. Block diagram of the audio system is as below: Page 12 of 24... -
Page 13: Mic& Receiver Loop
2.2.3.2 MIC& Receiver Loop Audio path is shown below：MIC must have a bias voltage in order to operate normally——2.0± 0.1V. When MIC is in good condition but loop MIC has no echo, then you need to check the basic bias voltage signal of the MICBIASP and MICBIASSP, the language signals of the RECEIVER and MIC also need to be checked. -
Page 14: Headset Loop
2.2.3.3 Headset Loop Headset loop includes two signals: Headset speaker and MIC， If the headset fitting were in good condition, when the headset plug in, it appears abnormal, such as: The Headset speaker has no sound、the MIC is invalid. All this need to check the access conditions of the circuit above. Page 14 of 24... -
Page 15: Baseband Fault Issues
2.2.4 Baseband Fault issues Maintenance process of the download failure Issues: Download Fail Exclude the reason of Check to see if it is caused by other download failure factors such as: configuration, download caused by other factors cable, power supply, software and PC Check if the system Check to see if the serial ports between connector is poor... -
Page 16: Analysis Of The Keyboard Fault
2.2.4.1 Analysis of the keyboard fault This handset has 3 side keys. All the keyboard circuits use the scanning method to detect except the power button .When a button is pressed the scanning signal will be triggered, then the corresponding row and column will be detected. The function of the key can be identified according to software definition. -
Page 17: Fm Module
2.2.4.3 FM Module FM adopts the design of MT 6628. 2.2.4.4 Camera Module This module uses the 8million pixel front camera and 5 million pixel rear camera, connecting to baseband chip through connector. The welding of the connector is the main reason for the camera malfunction. -
Page 18: Io Interface
Power supply circuit : VCAM_IOPMU_1.8V for camera I/O port, VCAMD_PMU 提供 1.5V for camera core, VCAMA_PMU _2.8V for analog power. 2.2.4.5 IO Interface IO applies 5pin standard interface，which realize the functions of USB, charging and download. 2.2.4.6 SIM Card Circuit Switch of dual SIM cards is integrated into baseband. -
Page 19: Bt/Wifi/Gps Circuit
2.2.4.7 BT/WIFI/GPS Circuit BT/WiFi/GPS are integrated into MT6628. 2.2.4.8 G-sensor Circuit Page 19 of 24... -
Page 20: M-Sensor Circuit
2.2.4.9 M-sensor Circuit Gyroscope 2.2.4.10 Circuit Page 20 of 24... - Page 21 3. Service tools/equipment list Page 21 of 24...
- Page 22 Page 22 of 24...
- Page 23 4. Disassembly Instruction Page 23 of 24...
- Page 24 Page 24 of 24...
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