1
BLU Aria
Service Manual
2
ATTENTION
Boards, which contain Electrostatic Sensitive Device(ESD), art indicated. Following information
is ESD handling:
- Service personnel should ground themselves by using a 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 sensitive parts in these protective packages until these are used.
- When returning system boards or parts like EEPROM to the factory, use the protective packages as describe
3
CAUTIONS
1、 Please read this service manual carefully and make sure all elements of anti-static are in place before the
repair work is carried out.
2、 Servicing and alignment MUST be undertaken by qualified personnel only.
3、 Please use specified tools and equipments for servicing, in which the parameters need to be calibrated with
specified criteria.
WARNING： This document can only be used internally by BLU or BLU’s business partners, without the
approval of BLU management team any copying or distribution to third party are not allowed. Without the
approval of BLU, publishing, distribution, copy, save or transfer of this or part of this document are not
allowed. BLU reserves the right of modifying or updating for this document without notification and BLU
has the final power of interpretation.
Content
1. Brief Introduction….…………………………………………………………………………………...3
2. Exploded View………………………………………………………………………………………….4
3. Tools……………………………………………………………………………………………………..5
4. Assemble & Dissemble
Dissembly..................………………………………………………………………………….........6
Assembly………………………………………………………………………………………….…..7
5. Picture of main board
A&B side of PCBA .…………….…………………………………………………….…………….8
A&B of PCBA Layout………….….………….…………………………….………………….……..9
6. System Block Chart…………………………………………………………………………………...10
7. Unit Circuit Map ………………………………………………………………………..….......11-18
8. Trouble Shooting Guide ……..…………………………………………………………….... 19-36
9. Upgrading & IMEI writing………………………………………………………………...……...38-46
10. CIT testing…………………………………………………………………………………… ……...47
4
Chapter 1 Specification
Specification :
Network: 850MHz/1900MHz or 900MHz/1800MHz
Display: 1.77“TFT 128*160
Camera: 0.08Mega with sw upgrade 0.3M;
Travel Charger AC Adaptor: 5V 350mah
Lithium Battery: Standard (900mAh)
USB Data cable: USB 1.0
Aria(B1080B) Features & Functions
Dual SIM
Fashion bar phone
Wireless FM
Moner detector flash
Multi-Media application
0.08M sw upgarde to 0.3M by sw (option)
T-Flash（Support 8G T Card）
1.77“TFT 128*160
MP3、MP4、3GP、AVI
Micro USB
3.5 Audio Jack
BT 3.0
5
Chapter 2 Exploded View
1. Lens
3. Receiver
4. Front cover
5. FM antenna
7. LCD
9. PCBA
11. Speaker
13 Back cover
18 Battery
19 Camera
21 DOME
22 Keypad
6
Chapter 3 Tools
Power Supply
Multimeter
Solder iron
Hot Air Gun
Solder wire, Flux
PC, Download cable
Others
Pick
Screw
Driver
Tweezer
Wrist
grounding
strap
Antistatic
gloves
Cable
7
Chapter 4 Disassembly & Assembly
1. Disassembly Process
Finished.
1. Remove the battery cover
2. Unfasten the 4 screws by screw driver
4. Remove the PCBA ..
5. Stick protection film for front cover.
3. Prize up the back cover by pick
6. Stick protection film for LCM
8
2. Assembly Process
Finished.
4. Install the rear cover module.
3. Install the PCBA on the front cover..
1. Remove the protection film.
2. Remove the protection film..
6. Install the back cover.
5. Fasten the 4 screws.
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Chapter 5 Picture of PCBA
5.1 Side A
PCBA (Side A) Location of components
Side B
5.2 Side B
PCBA (Side B) Location of Components
J201 battery
conector
J302 I/O
connector
J502 SIM
connector
U101 CPU
MT6250
U502 RF
PA IC
SKY77542
Mic
D601 Light
Emitting diodes
Keypad
Connector
LCD connector
J301
T-flash connector
Side A
U501
26MHZ
Camera connector
J303 Earphone
connector
J503 SIM
connector
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5.3 PCBA Layout side A
5.4 PCB Layout Side B
11
Chapter 6 System Block Chart
12
Chapter 7 Unit Circuit
7.1.1 System Overview
MT6250 is a GSM/GPRS handset chip solution which integrates RF,analog baseband,digital
baseband as well as Power Management Unit(PMU) and can greatly reduce the component count
and make a smaller PCB size MT6250 including Bluetooch and FM. Besides,MT6250 is capable of
Single Antenna Interference Cancellation (SAIC) and AMR speech. Based on a 32-bit ARM7EJ-S
RISC
Processor,MT6250 provides an unprecedented platform with high quality modem performance. The
typical application diagram is shown as Figure 1.
TM
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Chapter 7 Unit Circuit
7.1.2 Baseband & CPU
Audio circuit
Keypad
connector circuit
Data
transportation
circuit
CAMERA Data
transportation
control side
BT Data
transportation
control side
MT6250
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7.1.2 Baseband – Keypad
7.1.3 Clock 32.768KHZ Circuit
Clock signal
transportation side
32.768 khz Clock
crystal
MT6250
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7.1.4 CPU to Flash
7.1.5 SIM data output
SIM 2 Clock
SIM 2 reset
SIM 2 Data
SIM 1 Clock
SIM 1 reset
SIM 1 Data
FLASH data transportation side
MT6250
16
item
voitage
current
Vcore
1.2v
200ma
Vio
2.8v
100ma
Vadd
2.8v
150ma
Vtcxo
2.8v
20ma
Vrtc
1.2v
200ma
Vmem
2.8v
150ma
Vsim
2.8v
20ma
Vcs
2.8v
200ma
vcs
1.8v
150ma
7.2 MT6250 CPU Power output
CPU 电压与电流输出对照表
7.3 Battery connector
Temperature
detection
Positive
pole
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7.4 I/O Interface (5PIN)
Data
transpo
rtation
Charge
input
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7.4 System Overview
The SKY77542 is a dual-band transmit and receive front-end module(FEM) with lntegrated
power Amplifier control(iPAC) for cellular handsets comprising GSM850 and DCS1900
operation. The FEM has capability in applications of US and euro dual-band platforms.Designed
in a low profile, compact form factor, the SKY77542 offers a complete Transmit VCO-to-Antenna
and Antenna-to-receive SAW filter solution. The FEM also supports Class 12 General Packet
Radio Service(GPRS)multi-slot operation.
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7.5 SIM circuit
SIM 1Clock
SIM 1 reset
SIM 1 power
SIM 1 Data
SIM 2 power
SIM 2 Clock, reset
SIM 2 Data
7.4 power amplifier
frequency
Power input
RF DC
Signal AC
antennal
SKY77542
Start
20
Chapter 8 Trouble shooting guide
Can’t Download
NO
Replace or
re-solder the I/O
connector
Check power management and
LDO, whether have normal
voltage output or open circuit
Cannot download
Check if it is caused by the
PC, cable, tools etc.
Power on
NO
NO
NO
NO
YES
YES
YES
No
YES
OK
Replace or re-config.
Check I/O Connector
Connect the cable, check if
the current is normal (about
30 mA)
Disconnect the cable
and check if the chipset
is over heat.
Check VCORE、VDD、
VADD、VTCXO、VRTC、
VMEM、26MHZ、
32KHcrystal
Replace U101 MT6250
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