BLU Products BLU DASH, Service Manual

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Contents
1. Summary ... ......................................................................................................................................................... . 4
1.1 Mobile Feature ... ................................................................................................................................... .. 4
1.2 Mobile Application System... ................................................................................................................. . 4
1.3 RF Part ... .............................................................................................................................................. . .. 6
1.3.1 Transmitter ... ............................................................................................................................. .. 7
1.3.2 TX Part ... ................................................................................................................................... .. 7
1.3.3 Frequency Synthesizer ... .......................................................................................................... .. 7
1.4 Baseband and Logical Control Part ... ................................................................................................. . . 7
1.4.1 Control and processing of RF part ... ......................................................................................... . 7
1.4.2 Power Management ... ............................................................................................................. . .. 7
1.4.3 Program Memory and Logical Control Part ... ......................................................................... . 8
1.4.4 Audio Interface... ....................................................................................................................... .. 8
1.4.5 Camera and LCD Interface ... ................................................................................................. .. . 8
1.4.6 SIM and T-card Interface ... .................................................................................................... .. . 9
1.4.7 USB and TP Interface ................................................................................................................10
2. Mobile Maintenance Guide ... .......................................................................................................................... 11
2.1 Baseband Common Fault ... ...................................................................................................................12
2.1.1 “Cannot download” fault check flow ... ................................................................................... 12
2.1.2 “Cannot power on” fault check flow ... ..................................................................................... 13
2.1.3 “Cannot charge” fault check flow ............................................................................................. 14
2.1.4 No Vibration ............................................................................................................................... 15
2.1.5 No Ring ... .................................................................................................................................. 15
2.1.6 No echo (The other side cannot hear the voice) ... ................................................................... 16
2.1.7 No echo (Cannot hear the other side's voice) ... ........................................................................16
2.1.8 LCD shows abnormal ... ............................................................................................................ 17
2.1.9 Camera abnormal ... ................................................................................................................... 17
2.1.10 Capacitive Touch Panel abnormal ... ...................................................................................... 18
2.1.11 “Cannot recognize T Card” fault check flow ... .................................................................... 18
2.1.12 “Cannot recognize SIM Card” fault check flow ... ................................................................ 19
2.1.13 ALS/PS Sensor abnormal ... .................................................................................................... 20
2.2 RF Common Fault ... .............................................................................................................................. 21
2.2.1 “Low receive sensitivity” fault check flow ... .......................................................................... 21
2.2.2 “Large Frequency difference” fault check flow ... ...................................................................21
2.2.3 “Cannot transmit” fault check flow ... .................................................................................. 22
2.2.4 “Cannot receive” fault check flow ... ......................................................................................... 23
2.3 MT6620 Common Fault ........................................................................................................................ 24
2.3.1 GPS Fault ... ............................................................................................................................... 24
2.3.2 WIFI/BT Fault ... ........................................................................................................................25
2.3.3 FM Fault ... ..................................................................................................................................25
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