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Customer Service

Service Manual

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5.1.10 System
Overview

The  SKY775XX  is  a  dual-band  transmit  and  receive  front-end  module(FEM)  with  lntegrated
power  Amplifier  control(iPAC)  for  cellular  handsets  comprising  GSM900  and  DCS1800
operation.  The  FEM  has  capability  in  applications  of  U  S  and  euro  dual-band
platforms.Designed  in  a  low  profile,  compact  form  factor,  the  SKY775XX  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.

SKY775XX

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Содержание Studio 5.0 II

Страница 1: ...Customer Service Service Manual 1 44 BLU STUDIO 5 0 II SERVICE MANUAL...

Страница 2: ...n 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...

Страница 3: ...tooth Support BT 4 0 Wi Fi 802 11b 802 11g 802 11n Lithium Battery 2000mAh Lipolymer battery USB Micro USB 2 0 Studio5 0II Main Function Full Touch Smartphone Android 4 2 CPU MT 6572W 1 3GHZ dual core...

Страница 4: ...4 44 CHAPTER 2 SERVICE TOOLS Voltage regulator Multimeter Iron Hot air gun Solder wire soldering paste Computer and software download cable Metal tweezers Screw driver etc Pick Driver Tweezers Wrist g...

Страница 5: ...e Manual 5 44 CHAPTER 3 DISASSEMBLY AND ASSEMBLY 3 1 DISASSEMBLY Remove the Battery cover 1 Remove the Middle cover 2 Remove the RF coaxial Line 4 Remove the LCD FPC 5 Remove the Power key Plastic 3 R...

Страница 6: ...Customer Service Service Manual 6 44 Remove the screw 7 Remove the PCBA 8 Remove the speaker PCBA 10 Remove the TP by sucker 11 Remove the TP 12 Remove the induction gum cover 9...

Страница 7: ...Customer Service Service Manual 7 44 Finished Remove the LCD by tweezers 13 Stick TP and LCD protection film 14 Remove the LCD 15...

Страница 8: ...Customer Service Service Manual 8 44 3 2 ASSEMBLY Install the PCBA 4 Install the TP 3 Install the LCD 1 Tear off protection film 2 Install the speaker PCBA 5 Install the RF coaxial Line 6...

Страница 9: ...Customer Service Service Manual 9 44 Install t he power key 11 Install the back cover 12 Install the RF Line 10 Install the Main camera 9 Install the LCD FPC 7 Install the 1 screws 8...

Страница 10: ...Customer Service Service Manual 10 44 Finished Install the Battery cover 14...

Страница 11: ...ge IC Bug by damaged Does not charge no charge in U101 CPU Bug by damaged Cannot power on No RF signal No display or display abnormality U401 Power IC Buy by damaged Cannot power on No charge in Speak...

Страница 12: ...t take photos J903 FPC connector Bug by damaged Front camera not work J802 TP Connector Bug by damaged TP not work U901 LED driver IC Bug by damaged LED no lights J801 LCD Connector Bug by damaged LC...

Страница 13: ...Customer Service Service Manual 13 44 Side A layout Side B layout...

Страница 14: ...d GPS modules The chip integrates a Dual core ARM R cortex A7 MPcoreTM operating up to 1 2Ghz an ARM Cortx R4 MCU and a powerful multi Standard Video accelerator MT6572 supports various interfaces inc...

Страница 15: ...rvice Manual 15 44 5 1 1 Introduction for baseband chip CPU part circuit Base station interface RF TX Control GPS Control RF RX Control WIFI BT Control Camera Control LCD Control Key Control SIM Contr...

Страница 16: ...Customer Service Service Manual 16 44 5 1 2 Baseband CPU circuit introduction for Modem...

Страница 17: ...tem solution MT6323 contains 3 buck converters and 24 LDOs which are optimized for specific 2G 3G smart phone subsystems MT6323 provides mono 0 7W into 8 high efficiency Class AB D audio amplifiers an...

Страница 18: ...Customer Service Service Manual 18 44 5 2 4 PM IC MT6323 SIM CONTROL CHARGER VBAT INPUT CONTROL SIGNAL AUDIO ALDO OUTPUT DLDO OUTPUT...

Страница 19: ...Overview The MT6166 is a RF transceiver targeted at high speed 2G 3G FDD TDD multi mode smart phone and tablet computers implanted in 40nm CMOS The RF transceiver function is fully integrated This do...

Страница 20: ...Customer Service Service Manual 20 44 5 1 6 RF MT6166 5 1 7 I O connector 5PIN Data Input Data Transition Power supply Power supply Signal in Crystal 26MHz...

Страница 21: ...27 does not have its dedicated crystal oscillator It either uses an extremely maybe temperature compensated oscillator or uses the clock source from companion chips in the platform such as MT6166 For...

Страница 22: ...Customer Service Service Manual 22 44 5 1 9 Four in one MT6627...

Страница 23: ...for cellular handsets comprising GSM900 and DCS1800 operation The FEM has capability in applications of U S and euro dual band platforms Designed in a low profile compact form factor the SKY775XX offe...

Страница 24: ...ce Service Manual 24 44 5 1 12SIM circuit SIM 1Clock SIM 1 reset SIM 1 power SIM 1 Data SIM 2 power SIM 2 Clock reset SIM 2 Data 5 1 11 power amplifier frequency Power input RF DC Signal AC antennal S...

Страница 25: ...KHZ Check and replace system clock 26MHz 32 768KHz Cannot power on Check the power manage supply output VCCRE 1 8V VDD 2 8V AVDD 2 8V VTCXO 2 8V VMEM 2 8V VRTC 1 2V Replace U101 MT6572 Upgrade the sof...

Страница 26: ...mal Check and replace RF IC BT IC WiFi IC FM IC CPU END Check and replace RF PA Audio PA PM IC Check if the capacitance varistor LDO tube leakage Use the touch method to check and replace the heat spa...

Страница 27: ...ch panel Check battery connector and battery touch point if is dropped or dirty Check the keypad if stuck or touch panel do not work to make the phone dead Check the CPU if is rosin joint or damage Ch...

Страница 28: ...abnormality after power on Check LCD connector is OK or not Change LCD connector can settle the defect issue Change or reweld CPU MT6572 Check LCD if damage or liquid flow out Change LCD Yes Clean or...

Страница 29: ...defective Insert SIM Clean or replace SIM connector Clean or reweld the SIM connector Check SIM connector is OK or not Resolder or replace CPU MT6572 OK Check if all the SIM pins are clean NO Check FP...

Страница 30: ...fective components Put a false antenna at RF PA IC to see if there s any signal Replace RF coaxial line Make a false antenna at RF filter check if there s any signal Saw filter is damaged replace it R...

Страница 31: ...mode Turn on the speaker measure the wave signal by oscillograph No sound or noise Remove the speaker and measure with multimeter to see if there s any sound Replace speaker The phone is in Silent mod...

Страница 32: ...he signal with oscillograph under calling mode Receiver is low Check if receiver connector is Resolder or clean the receiver connector Replace CPU U101 MT6572 Check if the receiver is broken or damage...

Страница 33: ...IC cover 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 Replace the MIC Replace FPC to check if the problem is solved Replace...

Страница 34: ...e the charge IC is ok or not No charge DOES NOT CHARGE NO CHARGE IN NO NO NO NO NO NO Change battery Check if I O connector works normal Check and replace FPC is ok or not NO Replace or re solder powe...

Страница 35: ...easure if T Flash slot pin 4 VMC was 2 8V Re solder or replace Power IC NO 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...

Страница 36: ...te and check the function is OK or not Software update Check 4 in 1 IC L12 pin have 3 7V B supply voltage or not Check C701 have VBATT V supply voltage or not Replace U701 Check U703 3pin have 37 4MHZ...

Страница 37: ...be up to 921600bit s when using USB Serial cable The driver needs to be installed before using the USB cable 1 computer eject hardware installation instruction and choose following item and then click...

Страница 38: ...Customer Service Service Manual 38 44 3 USB driver is installing 4 click finished as below Click here...

Страница 39: ...Customer Service Service Manual 39 44 2 Software upgrade 1 Open software upgrading platform SP_Flash_Tool_v3 1304 0 119 2 Choose USB mode 3 choose speed Do Not Switch speed...

Страница 40: ...Customer Service Service Manual 40 44 4 choose Scatter loading File 5 Click Scatter loading to choose file MT6577_Android_scatter emmc txt Choose Scatter loading Choose this...

Страница 41: ...Customer Service Service Manual 41 44 6 the software is upgrading 7 Finished Choose Download...

Страница 42: ...software the detail as figure 1 also it prove power supply clock is normal and defective typical issue is focus on CPU or FLASH poor soldering or damage and maybe software do not fit for hardware Cor...

Страница 43: ...Customer Service Service Manual 43 44 CHAPTER 8 TEST...

Страница 44: ...Customer Service Service Manual 44 44...

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