BLU Products NEO JR Скачать руководство пользователя страница 23 | Manualshive

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Customer Service

Service Manual

23

/

41

CHAPTER 7 TROUBLESHOOTING

CANNOT POWER ON-CURRENT SWING

INSTABILITY

26MHZ&32.768KHZ
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 software

Check and

replace the I/O

connector

Replace or re-weld

flash

Replace or
re-weld
power
manage IC

NO

NO

NO

NO

NO

NO

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Содержание NEO JR

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

Страница 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...

Страница 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...

Страница 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...

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

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

Страница 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...

Страница 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...

Страница 14: ...Customer Service Service Manual 14 41...

Страница 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...

Страница 16: ...Customer Service Service Manual 16 41...

Страница 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...

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

Страница 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...

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

Страница 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...

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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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