Table Of Contents - Blu Dash 4.5 Service Manual

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 ......................................................................................... 7
3. Trouble Shooting ............................................................................................. 8
3.1 Fail to startup/power on ................................................................................ 8
3.2 Fail to charge .............................................................................................. 9
3.3 Fail to display ........................................................................................... 10
3.4 Fail to call ................................................................................................. 11
3.5 Speaker no sound....................................................................................... 12
3.6 Earphone fail............................................................................................. 13
3.7 Vibrator fail .............................................................................................. 14
3.8 Side key fail .............................................................................................. 15
3.9 Failure to identify SIM card ........................................................................ 16
3.10 Camera fail ............................................................................................. 17
3.11 Failure to read T-flash card ........................................................................ 18
4. BGA related GND or no function pad ............................................................... 19
4.1 CPU and memory pin map .......................................................................... 19
4.2 PMU pin map ............................................................................................ 19
4.3 WIFI ....................................................................................................................... 20
4.4 TRANSEIVER ....................................................................................................... 20
Contents