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BLU Products NEO JR Service Manual

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Customer Service
Service Manual
BLU NEO JR
SERVICE MANUAL
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Summary of Contents for BLU Products NEO JR

  • Page 1 Customer Service Service Manual BLU NEO JR SERVICE MANUAL 1 / 41...
  • Page 2 Customer Service Service Manual 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.
  • Page 3 Customer Service Service Manual CHAPTER 1 INTRODUCTION Main Function Dual Card Dual Standby Full Touch Smartphone Android 4.2 CPU MT 6572A/E (1GHZ, dual-core) 3.5" HVGA320*480 P+F Camera：0.3 Mega-H /1.3 Mega-S, 0.3 Mega 512MB+256MB Dual SIM Data Segment: EDGE DL, GPRS SPEC：...
  • Page 4 Customer Service Service Manual CHAPTER 2 SERVICE TOOLS Iron Hot air gun Voltage regulator Multimeter Solder wire, soldering paste Tweezers Driver upDownlo Wrist groun ding Pick Antistatic Computer and software download cable Metal tweezers, Screw driver etc 4 / 41...
  • Page 5 Customer Service Service Manual CHAPTER 3 DISASSEMBLY AND ASSEMBLY DISASSEMBLY Remove the PET flakes…………….…………..…2 Remove the Battery cover…….……..………………... 1 unscrew the 7 screws… …….……………..………..3 Remove the back cover ………………………………4  Remove the TP FPC………………..………...………..5 Remove the LCD BY electric iron ………...…………….……...
  • Page 6 Customer Service Service Manual Stick TP and LCD protection film……………..……7 Remove the TP by sucker……………………..……..8 Finished。 。 。 。 。 。 。 6 / 41...
  • Page 7 Customer Service Service Manual ASSEMBLY Tear off protection film………………………………….2 Install the LCD BY electric iron..………………..…..…1 Install the PCBA……………..……..………….………..4 Install the TP…………………..………………..……3 Install the back cover……..…………………………..6 Install the connector…………..……….………...5 7 / 41...
  • Page 8 Customer Service Service Manual Install the RF antenna...……………..………………..…7 .Install the 7 screws.………………...…….……………8 Install the PET flakes…………... …………………... 9 Install the battery cover…….………………...……………10 Finished……… 8 / 41...
  • Page 9 Customer Service Service Manual CHAPTER 4 SYSTEM BLOCK DIAGRAM 4.1、PCBA A-Side J403 U100 U107 U800 RF PA RF IC Battery connector GPS/BT/WIFI/FM 4in1chip U201 U202 FLASH(4G) U400 Power Management J500 U203 J703 IO Earphone connector FLASH(2G) PCBA-B-Side Camera connector J510 LCD connector 9 / 41...
  • Page 10 Customer Service Service Manual 4.2:Side A layout Side B layout 10 / 41...
  • Page 11 Customer Service Service Manual CHAPTER 5 CIRCUIT INSTRUCTION 11 / 41...
  • Page 12 Customer Service Service Manual CHAPTER 6 UNIT CIRCUIT PRINCIPLE INTRODUCTION 6.1 MT6572 INTRODUCTION System Overview MT6572 is a highly integrated baseband platform incorporating both modem and application processing subsystems to enable 3G smart phone applications, with integrated Bluetooth, WILAN ○ and GPS modules.
  • Page 13 Customer Service Service Manual 6.1.1: Introduction for baseband chip CPU part circuit Base station interface RF TX Control Camera Control 13 / 41...
  • Page 14 Customer Service Service Manual 14 / 41...
  • Page 15 Customer Service Service Manual 6.2 Power management IC MT6323 General Descriptions MT6323 is a power management system chip optimized for 2G/3G handsets and smart phones, especially based on the MdeiaTek Mt6572 system solution. MT6323 contains 3 buck converters and 24 LDOs, which are optimized for specific 2G/3G/smart phone subsystems.
  • Page 16 Customer Service Service Manual 16 / 41...
  • Page 17 Customer Service Service Manual 6.3 System 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 document briefly introduces the RF macros in MT6166. 17 / 41...
  • Page 18 Customer Service Service Manual 6.4: RF -MT6166 6.5 I/O connector (5PIN) 18 / 41...
  • Page 19 Customer Service Service Manual 6.6 Four in one chip MT6627 MT6627 is a 4-in-1 connectivity chip which contains a WIFI/Bluetooth Transceiver, a GPS receiver, and a FM receiver front-ends, along with integrated passive device(IPD) in a QFN40 package. Simplified block diagram and how MT6627 connects to a companion modem is shown in Figure 1.
  • Page 20 Customer Service Service Manual 6.7: Four in one MT6627 20 / 41...
  • Page 21 Customer Service Service Manual 6.8: System 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.
  • Page 22 Customer Service Service Manual 6.9: power amplifier 6.10: SIM circuit 22 / 41...
  • Page 23 Customer Service Service Manual CHAPTER 7 TROUBLESHOOTING CANNOT POWER ON-CURRENT SWING INSTABILITY Cannot power on Upgrade the software Check the power manage supply output： Replace or VCCRE 1.8V Check and re-weld VDD 2.8V replace the I/O power AVDD 2.8V connector manage IC VTCXO 2.8V VMEM 2.8V...
  • Page 24 Customer Service Service Manual 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...
  • Page 25 Customer Service Service Manual 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? 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...
  • Page 26 Customer Service Service Manual NO DISPLAY OR DISPLAY ABNORMALITY No display or display abnormality after power on Check LCD if damage or liquid flow out Change LCD Check LCD connector is OK or not Clean or re-weld the LCD connector Change LCD connector can settle the defect issue?
  • Page 27 Customer Service Service Manual INSERT SIM REPAIR PROCESS Insert SIM Check if all the SIM pins are clean Clean or replace SIM connector. Check SIM connector is OK or not Clean or re-weld the SIM connector Check FPC on SIM connector is OK or not Replace FPC Replace SIM card...
  • Page 28 Customer Service Service Manual N0/WEAK SIGNAL TROUBLE SHOOING No or weak signal Inspect the antenna and antenna connector to see if there’s any distortion Replace the defective components. Check and replace RF coaxial line to see if there’s any signal . Replace RF coaxial line Put a false antenna at RF PA...
  • Page 29 Customer Service Service Manual NO/LOW SOUND FROM SPEAKER No sound or noise Remove the speaker and measure with multimeter to see if there’s any sound. The phone is in Silent mode. Replace speaker. Set the phone as normal mode Check and replace FPC is ok or not.
  • Page 30 Customer Service Service Manual RECEIVER LOW VOICE OR NO VOICE Receiver is low. Check if the receiver is broken or damaged Replace the receiver. Check if receiver connector is Re-weld clean the receiver connector. Measure the signal with oscillograph under calling mode Re-weld or replace power IC is ok or not.
  • Page 31 Customer Service Service Manual NO/LOW SOUND FROM MIC No/Low sound from Check if there’s 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 Replace the...
  • Page 32 Customer Service Service Manual DOES NOT CHARGE – NO CHARGE IN No charge Change battery Check charger and cable without problem, or change good one Upgrade the Check if I/O connector works normal Re-solder or replace the I/O connector Check and replace FPC is ok or not? Replace the FPC Replace the charge IC...
  • Page 33 Customer Service Service Manual CAN’T READ T-FLASH CARD Can’t read T-Flash card Check if T-Flash slot appearance was ok? Replaced the T-Flash slot Measure if T-Flash slot pin 4 VMC was 2.8V. Re-solder or replace Power IC Check if the voltage of T-Flash pin3/pin5/pin7 to the ground was around 0.7V with multimeter diode column...
  • Page 34 Customer Service Service Manual 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 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...
  • Page 35 Customer Service Service Manual Chapter 9 Firmware Upgrading Guide Firmware Upgrading 1. Install USB driver The maximum downloading speed can 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’’next step’’ Choose next step 2>...
  • Page 36 Customer Service Service Manual 3> USB driver is installing. 4> click’’ finished’’ as below. Click here 36 / 41...
  • Page 37 Customer Service Service Manual 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’’ 37 / 41...
  • Page 38 Customer Service Service Manual 3> choose’’Scatter-loading File’’ 4> Choose Scatter loading 5>Click ‘Scatter-loading’’ to choose file’’MT6577_Android_scatter.emmc.txt’’ Choose this 38 / 41...
  • Page 39 Customer Service Service Manual 6> the software is upgrading. Choose Download 7> Finished. 8>:Description: can’t power 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 on CPU or FLASH poor soldering or damage, and maybe software do not fit for hardware.
  • Page 40 Customer Service Service Manual 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 40 / 41...
  • Page 41 Customer Service Service Manual CHAPTER 9 CIT TEST 1. Insert T-Flash card and SIM card Press power on and by side button at the meantime to enter factory mode for CIT test.. 2. Choose Full test menu. to do full test. 3.