Blu Dash c music User manual

DASH C MUSIC

SERVICE MANUAL

INTRODUCTION

The purpose of this document is to help service workshop technicians to service products. This service manual

must be used only by authorized service suppliers. The content of it is confidential. Please note that provides

other guidance documents for service suppliers. Follow these regularly and comply with the given instructions.

While every effort has been made to ensure the accuracy of this document, some errors may exist. Please keep in

mind also that this documentation is continuously being updated and modified, so always watch out for the newest

version.

CAUTIONS

Please refer to the phone’s user’s guide for instructions relating to operation, care, and maintenance, which

include important safety information.

1 Servicing and alignment must be undertaken by qualified personnel only.

2 Ensure all work is carried out at an anti-static workstation and that an anti-static wrist strap is worn.

3 Use only approved components as specified in the parts list.

4 Ensure all components, modules, screws, and insulators are correctly re-fitted after servicing and

alignment

5 Ensure all cables and wires are repositioned correctly Electrostatic discharge can easily damage the

sensitive components of electronic products. Therefore, every service supplier must observe the precautions

which mentioned above.

GENERAL REPAIR INFORMATION

1 Make sure your testing equipment is functioning properly before beginning repair work.

2 Before starting repairs you must observe ESD precautions such as being in your ESD protected area and

connecting your wristband.

3 Use gloves to avoid corrosion and fingerprints.

4 Cover windows and displays with a protective film to avoid dust and scratches.

5 Use a lint-free cloth to clean the LCD.

6 When cleaning the pads use a soft cloth\ESD brush and isopropanol. Do not use a glass fiber pencil: this

scratches the surface and will corrosion.

7 Non-faulty mechanical parts(except shielding lids and bent parts or soldered components).May be reused

if they are not soldered.

8 When removing the shielding lids make sure to replace them with new ones, otherwise the high-frequency

leakage can affect the device.

9 Always use the original spare parts.

10 Check the soldering joints of the parts concerned with regard to the fault symptom. And resolder them if

necessary.

11 Remove excess soldering flux after repair.

12 Observe the torque requirements when assembling the unit.

13 please aware that some malfunctions may be software related and solved by an update

Contents

INTRODUCTION....................................................................................................................................... 2

CHAPTER 1 - OVERVIEW .......................................................................................................................... 4

EXPLODED VIEW AND COMPONENT DISPOSAL EXPLODED....................................................................................................4

DISASSEMBLY AND ASSEMBLY SERVICE TOOLS .....................................................................................................................5

CHAPTER 2 –SYSTEM BLOCK DIAGRAM ................................................................................................... 7

CHAPTER 3 –UNIT CIRCUITRY.................................................................................................................. 8

CPU CIRCUIT............................................................................................................................................................................8

CPU - KEYPAD INPUT............................................................................................................................................................10

SIM 1, SIM 2, T-FLASH JOINT CIRCUIT..................................................................................................................................10

EMMC - MCP ........................................................................................................................................................................11

BLUETOOTH/WIFI/GPS/FM..................................................................................................................................................12

MT6323 CPU POWER SUPPLY PORT.....................................................................................................................................14

BATTERY CONNECTOR ..........................................................................................................................................................16

CHARGER CIRCUIT ................................................................................................................................................................16

I/O CONNECTOR (5PIN).........................................................................................................................................................17

RF IC MT6166........................................................................................................................................................................17

WCDMA RF ...........................................................................................................................................................................19

AUDIO...................................................................................................................................................................................20

LCD INTERFACE .....................................................................................................................................................................23

LCD BACKLIGHT ....................................................................................................................................................................24

CAMERA INTERFACE.............................................................................................................................................................24

G-SENSOR .............................................................................................................................................................................25

ALS & PS SENSOR .................................................................................................................................................................25

TOUCH PANEL .......................................................................................................................................................................26

CHAPTER 4 - PCBA................................................................................................................................. 26

PCB LAYOUT CHART ..............................................................................................................................................................26

PCB SIDE A ............................................................................................................................................................................26

PCB SIDE B.............................................................................................................................................................................27

CHAPTER 5 - TROUBLESHOOTING .......................................................................................................... 31

TEST FLOW CHART OF TEST SIM CARD .................................................................................................................................31

TEST FLOW CHART NO POWER ON (MAIN).........................................................................................................................32

TEST FLOW CHART HEADPHONES........................................................................................................................................33

TEST FLOW CHART LCD.........................................................................................................................................................34

TEST FLOW CHART DOWNLOAD FAILED ..............................................................................................................................35

CHAPTER 6 –SOFTWARE UPDATE .......................................................................................................... 36

INSTRUCTION OF SW UPDATE..............................................................................................................................................36

CHAPTER 7 –FUNCTION TEST ................................................................................................................ 41

FUNCTION TEST ....................................................................................................................................................................41

CHAPTER 8 –PARAMETER SETTINGS...................................................................................................... 42