BLU STUDIO 5.

0 HD
Service Manual

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 CAUTIONS

Please refer to the phone’s user’s guide for instructions relating to operation, care, and maintenance, which include
important safety information.
Servicing and alignment must be undertaken by qualified personnel only.
Ensure all work is carried out at an anti-static workstation and that an anti-static wrist strap is worn.
Use only approved components as specified in the parts list.
Ensure all components, modules, screws, and insulators are correctly re-fitted after servicing and alignment
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.

CONTENTS
Content

1. Brief Introduction….……………………………………………………………………………….….3

2. Tools……………………………………………………………………………………………………..5

3. Assemble & Dissemble

Dissembly..................…………………………………………………………………………...6-11

Assembly………………………………………………………………………………………...12-17

6. Picture of main board

A&B side of PCBA .…………….…………………………………………………….…………..18

A&B of PCBA Layout………….….………….…………………………….………………….…....19

7. System Block Chart…………………………………………………………………………………...20

8. Unit Circuit Map ..…......................................................................................................... 21-27

9. Trouble Shooting Guide …..…………………………………………………………………….28-39

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 CHAPTER 1 INTRODUCTION

S5501 Main Function

Full Touch Smartphone

Android 4.2

CPU MT 6582 1.3G Quad core

5“HD 1280*720

Camera：8 AF Mega , Front camera： 2 Mega

BT 4.0 , WIFI : 802.11b, 802.11g, 802.11n

Flash Memory:8GB+1GB

Dual SIM

SPEC：

Network：

2G: 850MHz/900MHz/1800MHz/1900MHz

3G: 2100MHz/900MHz

Size：146*74*9.3mm

Bluetooth：Support BT 4.0

Wi-Fi: 802.11b, 802.11g, 802.11n

Lithium Battery: 2000mAh Battery

USB: Micro USB 2.0

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 CHAPTER 2 SERVICE TOOLS

Iron Hot air gun

Voltage regulator Multimeter Solder wire, soldering paste

Tweezers Driver

SW
upDownlo
Wrist
groun
ding

Pick
Antistatic

Computer and software download cable Metal tweezers, Screw driver etc

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 CHAPTER 3 DISASSEMBLY AND ASSEMBLY

3.1 DISASSEMBLY

Remove the battery cover……... 1 Unfasten the 10 screws…………………2

Prize up the back cover…….………..………..3 Remove the TP connector……….4

………4

Take out the camera…………...………..5 Remove the FPC connector………..…...………….……... 6

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 Unfasten the screws..…………...……7 Remove the FR coaxial line connector……...……..8

Remove the antenna PCBA……………..……….9 Remove the FPC connector………10

Remove the LED FPC……...…11 Remove the speaker…………….....12

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 Remove the speaker PCBA…………………..13 Remove the vibrator…………………..14

Use haet gun to heat aound the TP 200°C……..15 Remove the TP………..16

stick the protection film onto LCD…………..17 Stick the protection film onto TP……..18

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 Remove the LCD…………..19

Finished。。。。。。。

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 3.2 ASSEMBLY

Install the LCD……….…..………..…1 Remove the protection film………….2

Remove the protection film……….3 Install the TP………………………..4

Install the speaker PCBA…….……….....5 Solder the LED FPC…………...... 6

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 Install the FPC………………7 Install the vibrator…………..8

Install the antenna PCBA……..…………9 Install the RF coaxial line……………………….…10

Install the PCBA…..…………………11 Fasten the screws………….…..…12

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 Install the TP connector…..……13 Install the camera……..……14

Install the FPC connector..……15 Install the RF coaxial line.……16

Finished………
Install the speaker ……..……17 Solder the back cover…..……18

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 Fasten the 10 screws………...……19 Install the battery cover……………..…20

Finished

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 CHAPTER 4 SYSTEM BLOCK DIAGRAM

5.1 PCBA A-Side

U701 BT/WIFI/FM/GPS IC. J1003 Earphone connector. J1203 I/O connector. bug
Buy by damaged. bug by damaged. by damaged.
BT/WIFI/FM/GPS Not work Earphone no sound No charge. Can’t software.

U101 CPU Bug by damaged

Cannot power on. No RF
U501 RF IC Bug by
signal. No display or display
damaged. No signal
abnormality
Can’t power on.
U301 Flash Bug by damaged
U602/U603 Cannot power on, cannot
WCDMA PA upgrade software.
Bug by damage.
No signal.

U605 GSM PA
Bug by damaged.
No signal. Large current

J1202 Battery connector U401 Power IC Buy U801 LED Driver IC

Bug by damaged.Not by damaged, Buy by damaged,
power on. Cannot power on. LCD don’t light
Not charge in No charge in.
Speaker no sound.

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 PCBA B-Side

J901 Camera connector U901 Flashlight driver IC

Bug by damaged. Bug by damaged.
Can’t take photos. Flashlight don’t light.

J802 TP Connector
J903 Camera connector
Bug by damaged.
Bug by damaged.
TP not work.
Can’t take photos.

J1201 T-Flash Connector

J801 LCD Connector
Bug by damaged
Bug by damaged.
Can’t T-Flash card.
LCD No display or display
abnormality

J1001 FPC Connector J1204、J1205 SIM Connector

Bug by damaged.speaker、 Bug by damaged
vibrator and micphone Can’t Access SIM card.
Flashlight not work.

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 Side A layout

Side B layout

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 CHAPTER 5 UNIT CIRCUIT PRINCIPLE INTRODUCTION
5.1 MT6582 INTRODUCTION
System Overview
Media Tek MT6582 is a highly integrated 3G System-on-chip(SoC) which incorporates advanced
features e.g. HSPA R8 modem, Quad-core ARM Cortex-A7 MPCore TM operating at 1.2 GHz, 3D graphics
(Open GLJES 2.O),8M camera ISP , LPDDR2/3 533 MHz and high-Definition 1080p video decoder.
MT6582 helps phone manufacturers build high-performance 3G smart phones with PC-like browser,
3D gaming and cinema class home entertainment experiences.
WILAN and GPS modules.

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 5.2 Baseband CPU circuit introduction for power supply

CPU power
supply part

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 5.3 Introduction for baseband chip CPU signal output part circuit

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 5.4 Four in one MT6627

MT6627 is a 4-in-1 wireless communication device which includes

. WLAN
. Bluetooth
. GPS
. FM Transmitter and receiver
With four advanced radio technologies integrated into a single chip, MT6627 provides the best and most
convenient Connectivity functions. MT6627 implements advanced and sophisticated Radio antenna for Bluetooth
and WLAN,5GHz for WLAN and 1.575GHz for GPS).Enhanced overall quality for simultaneous voice data, and
audio/video Transmission on mobile phone and Tablet PC can be achieved. The small size with low power
consumption reduces PCB layout area the software package “Symphony” enables all advanced wireless features
on Android OS.

Power supply

Antenna

16.369MHZ Clock

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 5.5 Power management IC MT6323

General Descriptions
MT6323 is a fully integrated PMIC target for smart phone power provider. See Figure 3-1 the block
diagram for the whole picture of MT6323 PMIC

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 5.6 WCDMA PA IC

Description
The SKY7776XX Power Amplifier Module (PAM) is a fully matched 10-pad surface mount module developed for
Wideband Code Division Multiple Access (WCDMA) applications, This small and efficient module packs full
1920-1980 MHz bandwidth coverage into a single compact package. Because of high efficiencies stained
throughout the entire power range, the SKY7776X delivers unsurpassed talk-time advantages. The SKY7776X
meets the stringent spectral linearity requirements of High Speed Downlink Packet Access(HSDPA).High Speed
Uplink Access (HSUPA),and long Term Evolution (LTE)data transmission with high power added efficiency. An
integrated directional coupler eliminates the need for any external coupler.

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 SKY7775XX POWER AMPLIFIER MODULE FOR

CDMA/WCDMA/HSDPA/HSUPA/HSPA+/LTE- DAND

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 CHAPTER 6 TROUBLESHOOTING

CANNOT POWER ON-CURRENT SWING

INSTABILITY

Cannot power on

Upgrade the software

NO

Check the power manage

supply output：
VIO 18 NO Replace or
Check and
DVDD 2.8V NO re-weld
replace the I/O
VIO 28 power
connector
VTCXO 2.8V manage IC
VEMC 3.3V
VRTC 1.2V

NO

26MHZ&32.768KHZ
Check and replace
system clock：26MHz
&32.768KHz
NO

Replace or re-weld
Flash
NO

Replace U101
MT6582

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 MT6323 power manage supply output：

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 CANNOT POWER ON-LARGE CURRENT

Make the phone connect the power

supply and then press power key
find large current make the phone
heat

Check if the phone

leakage (current 0mA is
normal)

Use the touch

method to check and
replace the heat
spare parts
Check and replace Check and
RF IC, BT IC, WiFi replace RF PA,
IC, FM IC, CPU Audio PA, PM IC
Check if the
capacitance,
varistor, LDO tube
leakage

END

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 REPAIR FLOW FOR PHONE DEAD

Phone dead

Upgrade the software can

settle the defect issue?

Check battery connector

and battery touch point if
is dropped or dirty?
YES Clean or replace
the battery or
battery connector.
Check the keypad if stuck
or touch panel do not work
to make the phone “dead”?

Check and reinstall YES

the keypad or replace
the touch panel.
Check the flash if is rosin
joint or damage?

YES Re-weld or replace

Flash.

Check the CPU if is

rosin joint or damage?

YES
Re-weld or replace
CPU.

Upgrade the software

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 NO DISPLAY OR DISPLAY ABNORMALITY

No display or display
abnormality after power on

Check LCD if damage or

liquid flow out

Yes
Change LCD

Check LCD connector

is OK or not

Clean or re-weld Yes

the LCD connector

Change LCD connector

can settle the defect
issue?
No
Upgrade software

Change the LCD can

settle the defect
issue?

Change or re-weld CPU

MT6582

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 INSERT SIM REPAIR PROCESS

Insert SIM

Check if all the SIM

pins are clean

NO Clean or replace
SIM connector.

Check SIM connector OK

is OK or not

Clean or re-weld the NO

SIM connector

Check FPC on SIM

connector is OK or not

NO NO Replace FPC
Replace SIM card

Upgrade software can

settle the defect issue?

NO

MT6582 may be
defective

Re-weld or replace
CPU MT6582

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 SIM CIRCUIT SIM1&SIM2

From power IC

From power IC

From power IC
From power IC

Power IC SIMLVS

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 N0/WEAK SIGNAL TROUBLE SHOOING

No or weak
signal

Inspect the antenna and

antenna connector to see
if there’s any distortion
YES Replace the
defective
components.
Check and replace RF
coaxial line to see if there’s
any signal .
Replace RF YES
coaxial line

Put a false antenna at RF PA

IC to see if there’s any signal

YES Replace RF
PA

Make a false antenna

at RF filter, check if
there’s any signal
Saw filter is Yes
damaged,
replace it.
Replace 26M oscillator
to check if the problem
is solved.
No

Re-weld or replace
CPU MT6582

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 RF Circuit RF-PA Circuit

2G PA SKY77590
Antenna

2G TX 3G TX/RX

2G RX

3G TX To RF switch

3G PA SKY775XX

3G TX from RF IC
power detector

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 NO/LOW SOUND FROM SPEAKER

No sound or noise

Remove the speaker and

measure with multimeter
to see if there’s any
sound.
NO

The phone is in
Silent mode.
Yes
Set the phone as Replace speaker.
normal mode
Check and replace
FPC is ok or not.
NO
Replace FPC.

Turn on the speaker,

measure the wave
signal by oscillograph

NO

Replace power IC or
MT6582

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 Speaker circuit

Audio PA IC

From power IC To speaker

Audio detector

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 RECEIVER LOW VOICE OR NO VOICE

Receiver is low.

Check if the receiver is

broken or damaged
Yes Replace the
receiver .

Check if receiver
connector is
Resolder or clean the YES
receiver connector.

Measure the signal

with oscillograph
under calling mode
NO

Resolder or replace
power IC is ok or not.

NO

Replace CPU
U101 MT6582

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 Receiver circuit

Main related component: BBIC(U101),power IC(U401),receiver

From power IC
Receiver

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 NO/LOW SOUND FROM MIC

No/Low sound from

MIC

Check if there’s
MIC cover
No Install the MIC
cover.

Press power on and side

button to test mode and
activate echo loop,
measure MIC voltage is
1.5V、0.7V

Yes Replace the MIC

Replace FPC to check if

the problem is solved

Replace the YES

FPC

Measure C1124、C1125
with multimeter to see if
there’s 0.5V offset voltage

NO

Resolder or replace
CPU MT6582

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 Microphone circuit

Main related component: BBIC(U101),power IC(U401),microphone

From power IC To microphone

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 DOES NOT CHARGE – NO CHARGE IN

No charge

Change battery

NO

Check charger and cable without

problem, or change good one

NO NO
Upgrade the

Check if I/O connector

works normal
NO Re-solder or replace
the I/O connector

Check and replace

FPC is ok or not?

Replace the FPC NO

Replace the charge IC

is ok or not?

NO

Replace or re-solder
power IC

NO

Replace or re-solder
CPU MT6582

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 Charge circuit
Main related component: BBIC(U101),power IC(U401),charge IC(U402) I/O connector(J1203)

From I/O connector

To battery connector

Charge IC

Charge detector

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 CAN’T READ T-FLASH CARD

Can’t read
T-Flash card

Check if T-Flash slot

appearance was ok?
YES Replaced the
T-Flash slot

Measure if T-Flash
slot pin 4 VMC was
2.8V.
Re-solder or NO
replace
Power IC
Check if the voltage of T-Flash
pin3/pin5/pin7 to the ground was
around 0.7V with multimeter
diode column
Measure if there is pin
NO YES
short for the T-flash
adjacent pins
CPU MT6582
YES
solder poor or
damaged
Check if replace
T-Flash slot can
fix this
Re-solder or
replace CPU
MT6582 NO

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 T-Flash connector circuit
Main related component: BBIC(U101),T-Flash connector(J1203)

T-Flash connector
From BBIC

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 WIFI、BT、FM 、GPS DEFECT REPAIR FLOW CHART

WIFI can’t open，

Can’t work normal

Software update and check

the function is OK or not

YES Software update

Check 4 in 1 IC 29#.33#.36#40#
pin have 1.8V, 3.3BVsupply
voltage or not

Check power IC have

VBATT V supply voltage or
not
YES Replace U701

Check U701 10pin have

32KHZ clock signal
output or not by
oscilloscope (OSC)
NO

Replace Y701 NO

Resoldering or Replace
U701 4 in 1 IC

Resoldering or Replace
CPU MT6582

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 WIFI BT FM GPS 4 in 1 circuit
Main related component: BBIC(U101),power IC(U401),4 in 1 IC(U701), antenna.

WIFI&BT& control line

From BBIC
WIFI&BT IQ RX/TX
(From BBIC)
WIFI&BT

MF control line
From BBIC
GPS IQ RX
From BBIC GPS ANT

FM ANT From
Earphone connector

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