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Customer Service

Service Manual

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41

CHAPTER 3 DISASSEMBLY AND ASSEMBLY

3.1 DISASSEMBLY

Remove the Battery cover…….……..………………... 1

Remove the PET

flakes

…………….…………..…2

Remove the back cover ………………………………4

Remove the TP FPC………………..………...………..5

unscrew the 7 screws…

…….……………..………..3



Remove the LCD BY electric iron

………...…………….……... 6

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Summary of Contents for NEO JR

Page 1: ...Customer Service Service Manual 1 41 BLU NEO JR SERVICE MANUAL...

Page 2: ...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...

Page 3: ...mm Camera 0 3 Mega H 1 3 Mega S 0 3 Mega Image 1280 960 Lithium Battery 1300mAh Bluetooth Version BT 4 0 Main Function Dual Card Dual Standby Full Touch Smartphone Android 4 2 CPU MT 6572A E 1GHZ dual...

Page 4: ...4 41 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...

Page 5: ...vice Manual 5 41 CHAPTER 3 DISASSEMBLY AND ASSEMBLY 3 1 DISASSEMBLY Remove the Battery cover 1 Remove the PET flakes 2 Remove the back cover 4 Remove the TP FPC 5 unscrew the 7 screws 3 Remove the LCD...

Page 6: ...Customer Service Service Manual 6 41 Finished Stick TP and LCD protection film 7 Remove the TP by sucker 8...

Page 7: ...Customer Service Service Manual 7 41 3 2 ASSEMBLY Install the PCBA 4 Install the TP 3 Install the LCD BY electric iron 1 Tear off protection film 2 Install the TP connector 5 Install the back cover 6...

Page 8: ...Customer Service Service Manual 8 41 Finished Install the battery cover 10 Install the PET flakes 9 Install the RF antenna 7 Install the 7 screws 8...

Page 9: ...EM BLOCK DIAGRAM 4 1 PCBA A Side PCBA B Side J403 Battery connector U100 RF PA U800 GPS BT WIFI FM 4in1chip U201 CPU U202 FLASH 4G J500 Earphone connector U203 FLASH 2G U400 Power Management Ic J510 L...

Page 10: ...Customer Service Service Manual 10 41 4 2 Side A layout Side B layout...

Page 11: ...Customer Service Service Manual 11 41 CHAPTER 5 CIRCUIT INSTRUCTION...

Page 12: ...band platform incorporating both modem and application processing subsystems to enable 3G smart phone applications with integrated Bluetooth WILAN and GPS modules The chip integrates a Dual core ARM R...

Page 13: ...Customer Service Service Manual 13 41 6 1 1 Introduction for baseband chip CPU part circuit Base station interface RF TX Control Camera Control...

Page 14: ...Customer Service Service Manual 14 41...

Page 15: ...aTek Mt6572 system 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 audi...

Page 16: ...Customer Service Service Manual 16 41...

Page 17: ...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 doc...

Page 18: ...Customer Service Service Manual 18 41 6 4 RF MT6166 6 5 I O connector 5PIN...

Page 19: ...7 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 W...

Page 20: ...Customer Service Service Manual 20 41 6 7 Four in one MT6627...

Page 21: ...or 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 offer...

Page 22: ...Customer Service Service Manual 22 41 6 9 power amplifier 6 10 SIM circuit...

Page 23: ...HZ 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 soft...

Page 24: ...rmal 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 tubeleakage Use the touch method to check and replace the heat spa...

Page 25: ...h 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 Che...

Page 26: ...abnormality after power on Check LCD connector is OK or not Change LCD connector can settle the defect issue Change or re weld CPU MT6572 Check LCD if damage or liquid flow out Change LCD Yes Clean or...

Page 27: ...defective Insert SIM Clean or replace SIM connector Clean or re weld 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 F...

Page 28: ...tive 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 Repl...

Page 29: ...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...

Page 30: ...ure the signal with oscillograph under calling mode Receiver is low Check if receiver connector is Re weld clean the receiver connector Replace CPU MT6572 Check if the receiver is broken or damaged Ye...

Page 31: ...MIC cover Install the MIC cover Press power on and side buttonto 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 Replac...

Page 32: ...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...

Page 33: ...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...

Page 34: ...ate 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 C901 have VBATT V supply voltage or not Replace U901 Check U903 3pin have 37 4MH...

Page 35: ...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...

Page 36: ...Customer Service Service Manual 36 41 3 USB driver is installing 4 click finished as below Click here...

Page 37: ...Customer Service Service Manual 37 41 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...

Page 38: ...Customer Service Service Manual 38 41 3 choose Scatter loading File 4 5 Click Scatter loading to choose file MT6577_Android_scatter emmc txt Choose Scatter loading Choose this...

Page 39: ...wer on also upgrade software fail Root cause red scroll 100 run completely when upgrade software the detail as figure 1 also it prove power supply clock is normal and defective typical issue is focus...

Page 40: ...Customer Service Service Manual 40 41 Corrective action 1 My mobile phone electric 2 Run the tool 3 press Ctrl Alt t Tool Title Hint Runtime Trace Mode 4 Mene help submenu Open logs folder...

Page 41: ...ode for CIT test 2 Choose Full test menu to do full test 3 Test relative items one by one a Version check b LCD test c Vibrator d LED test e Main loopback test f Headset loopback g Speaker h Receiver...

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