Blu Dash 4.5 Service Manual
Hide thumbs
Also See for Dash 4.5:
- User manual (21 pages) ,
- User manual (31 pages) ,
- User manual (34 pages)
Table of Contents
Advertisement
Quick Links
Download this manual
See also:
User Manual
Advertisement
Table of Contents
Related Manuals for Blu Dash 4.5
Summary of Contents for Blu Dash 4.5
- Page 1 BLU Dash 4.5 Service Manual...
-
Page 2: Table Of Contents
Contents 1. Introduction ..................... 3 1.1 Objective ....................3 1.2 General Safety notice ................... 3 1.3 Use Instruction .................... 3 2. Technology summarize ..................4 2.1 Description of main board component map ............. 4 2.2 MT6589 circuit system ................. 6 2.3 Base band circuit .................. -
Page 3: Introduction
1. Introduction 1.1 Objective The manual is not a general publication but only edited for experienced technicians. The main purpose is to provide the basic foundation for the electrical & mechanical maintenance. 1.2 General Safety notice 1) Only an experienced technician can use this guide to repair the product while powered on. Any maintenance by other non-technicians will cause serious damage of the handset. -
Page 4: Technology Summarize
2. Technology summarize 2.1 Description of main board component map... -
Page 6: Mt6589 Circuit System
2.2 MT6589 circuit system MT6589M functional block diagram as following: MD501 functional system is made of three parts as below: Digital baseband function: Memory, LCM, GPIO interface, Keypad interface etc. Analog baseband function: AUDIO（including MIC, Receiver, Speaker）,Camera, Video, Ambient light and Proximity sensor, Power management, RTC, Charge control, etc. RF function: RF front-end module, Antenna, RF transceiver, GSM/WCDMA communication system, etc. -
Page 7: Base Band Circuit
2.3 Base band circuit MT6589M baseband System Architecture as following: Processing features: ◆ High-performance ARM CORTEX A7 1.2GHz application processor : 1） ARM architecture v7 2） 32 KB instruction and 32 KB data cache 3） 8-stage In-order pipeline with dynamic branch prediction 4）... -
Page 8: Trouble Shooting
3. Trouble Shooting 3.1 Fail to startup/power on The following conditions may cause boot fail: battery low, battery connector is damaged or bad welding, components bad weld/short-circuit or damaged First, change a fully charged battery test, still startup fail, check battery connector ok or not, if connector damaged change a new one;... -
Page 9: Fail To Charge
3.2 Fail to charge Check charging circuit related component, check below information in sequence: First, checks whether boot normal use the battery, if not check battery connector solder ok or not; Second, check USB connector on board solder ok or not; Third, check T1110 whether reverse, check C1321resistance is very big or not, check B1110，B1111 solder ok or not;... -
Page 10: Fail To Display
3.3 Fail to display The screen dose not shines or shows white: First, use DC power supply to start-up, check the board whether power on normal, ensure main board can power on normal Second, check LCD module, change a new module, check whether can display normal, Third, check L1090, D1510 solder ok or not Fourth, use oscilloscope to test LCD_BACKLIGHT_EN, check it whether high, if not, check R1210 resistance, U300solder ok or not, re-hot U300or check a new one. -
Page 11: Fail To Call
3.4 Fail to call When call with somebody, we cannot hear what he says or he cannot hear what we say: This fail may cause by receiver or microphone fail, it can test in factory mode, type“*#*#9375#*#*” enter factory mode, Transmitter/Receiver test, if ok, it may RF fail, if fail, we need to make sure is receiver or microphone fail. -
Page 12: Speaker No Sound
3.5 Speaker no sound First, check speaker ok or not, change a new one; Second, check B1330、B1333、C1780、C1781、C1782, solder ok or not; Third, check U2, re-hot or change a new one. No sound Is speaker OK? Replace Speaker Are B1910, B1911 ADD B1910,B1911 NC or not? Check T1912,... -
Page 13: Earphone Fail
3.6 Earphone fail No sound in earphone Is earphone Replace connector OK? earphone Is J601 soldering Re-solder J601 well? Re-solder uncorrected Are All TVS right direction? Re-solder Related R, uncorrected R C C right? Hot or change U300... -
Page 14: Vibrator Fail
3.7 Vibrator fail Motor doesn’t work Change a Supply 3.3V for motor, test motor can work or new Motor Check related R, C OK Change uncorrected or NOT, Check D1401 component reverses or not Hot U2 or Change a new one... -
Page 15: Side Key Fail
3.8 Side key fail Side key no function Re-solder or Is key switch soldering change new R1775, R1776 Solder 1K resistance R1777, NC or not? Check U2 Re-sold or change U2... -
Page 16: Failure To Identify Sim Card
3.9 Failure to identify SIM card SIM is not identified Touch Pin is Clean SIM socket clean? SIM is damaged. Change a new Replace it SIM to try Change a new one. Is SIM socket good? Change U2 Check if VSIM1/ VSIM2 are OK? Check each signal Hot U2r change a... -
Page 17: Camera Fail
3.10 Camera fail First, change a new camera module, check camera connector ok or not; Second, check AVDD, DOVDD, if fail check J1400 Third, use oscilloscope to test I2C, CAM_RST, CAM_MCLK, CAM_PCLK, MIPI_DATA, and MIPI_CLK. If signals abnormal check U300, re-hot or change a new one. Camera fail Is camera connector Re-solder or... -
Page 18: Failure To Read T-Flash Card
3.11 Failure to read T-flash card First, change another T flash card, check whether T flash card bad or not Second, check card connector solder ok or not, if fail, re-solder or change a new one Third, check TVS reserved or not, check VDD whether normal Fourth, test related signals, such as MCCK, MCCM0, MCDA0, MCDA1…MCDA3, if abnormal, check U300, re-hot or change a new one. -
Page 19: Bga Related Gnd Or No Function Pad
4. BGA related GND or no function pad Red--------no function pad White------GND pad 4.1 CPU and memory pin map 4.2 PMU pin map... -
Page 20: Wifi
4.3 WIFI 4.4 TRANSEIVER...