BLU Products BLU DASH Service Manual Download Page 13 | Manualshive

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Notice

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MTK continuously updated FlashTool, please use the latest Flash Tool.

2.1.2 “Cannot power on” fault check flow

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Summary of Contents for BLU DASH

Page 1: ...SERVICE MANUAL BLU DASH...

Page 2: ...ower 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 sid...

Page 3: ...wrist strap when exchange system boards When repairs are made to a system board they should spread the floor with anti static mat which is also grounded Use a suitable grounded soldering iron Keep se...

Page 4: ...rs build high performance 3 75G smart phone with PC like browser 3D gaming and cinema class hone entertainment experience 1 1 Mobile Feature 1 App Processor ARM1176JZF S 650MHz 2 Modem Processor ARM11...

Page 5: ...1 2 1 chip block diagram MT6573 baseband chip application as Image 1 2 2 1...

Page 6: ...nd sending data signal modulation and power enlargement cause outburst pulse signal that correspond with GSM or UMTS standard demand and transmit the signal to BTS through antenna RF circuit performan...

Page 7: ...ntrol including RF part battery management and charger part and I O port include keypad scan display audio I O SIM card COM download port and so on control and management 1 4 1 Control and processing...

Page 8: ...interface access MCP stores important communication protocol software and mobile control program and MMI software MCU run relative FLASH software to coordinate mobile operation include RF and I O int...

Page 9: ...1 4 3 LCD and Camera interface 1 4 6 SIM and T card Interface The circuit of audio interface is shown as Image 1 4 4 1...

Page 10: ...4 4 T card and SIM Interface 1 4 7 USB and TP Interface DASH support USB2 0 High Speed Data transmission support Capacitive Touch Panel the interface is shown as Image 1 4 5 1 4 5 USB and TP Interface...

Page 11: ...ice we can check power supply line first and then check control line at last check signal line expel fault step by step During maintenance if you encounter failure probability of 100 please contact th...

Page 12: ...2 2 PCBA negative diagram The following project will introduce the troubleshooting process of mobile phone of motherboard 2 1 Baseband Common Fault 2 1 1 Cannot download fault check flow 1...

Page 13: ...Notice MTK continuously updated FlashTool please use the latest Flash Tool 2 1 2 Cannot power on fault check flow...

Page 14: ...save the final calibration measure information of the cell phone formatting and re written into the mobile phone after formatting Or make the final measurement calibration again after formatted 2 1 3...

Page 15: ...2 1 4 No Vibration 2 1 5 No Ring 1...

Page 16: ...2 1 6 No echo The other side cannot hear the voice 2 1 7 No echo Cannot hear the other side s voice 1...

Page 17: ...2 1 8 LCD shows abnormal 2 1 9 Camera abnormal 1...

Page 18: ...2 1 10 Capacitive Touch Panel abnormal 2 1 11 Can not recognize T Card fault check flow 1...

Page 19: ...2 1 12 Can not recognize SIM Card fault check flow 1...

Page 20: ...2 1 13 ALS PS Sensor abnormal 1...

Page 21: ...2 2 RF Common Fault 2 2 1 Low receive sensitivity fault check flow 2 2 2 Large Frequency difference fault check flow 1...

Page 22: ...2 2 3 Cannot transmit fault check flow 1...

Page 23: ...2 2 4 Cannot receive fault check flow 1...

Page 24: ...n Fault MT6620 is a 4 in 1 wireless communication device which includes a WLAN b Bluetooth c GPS d FM Transmitter and Receiver The MT6620 module on the board as shown in Figure 2 3 2 3 MT6620 module 2...

Page 25: ...2 3 2 WIFI BT Fault 2 3 3 FM Fault 1...

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