Blu LIFE 8 Service Manual
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Blu LIFE 8 Service Manual

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BLU LIFE 8
SERVICE MANUAL

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Summary of Contents for Blu LIFE 8

  • Page 1 BLU LIFE 8 SERVICE MANUAL...

  • Page 2: Table Of Contents

    Compile Objective ..........................4 Project Background ........................... 4 LIFE 8 SUMMARIZE ......................... 5 LIFE 8 product description ....................... 7 Assembly components on TOP layer as follow................. 8 Assembly components on Bottom layer as follow： ................ 9 LIFE 8 Hardware Diagram ......................10 RF PARTS ............................
  • Page 3 5.10 Charge function: ......................... 27 DEFECT DESCRIPTION ABBREVIATION ................. 28 THE TAG ............................29...

  • Page 4: Introduction

    The readers of the document should be the debug worker of SMT and after-service. It will be the work guide for them. At the same time, the other members of the LIFE 8 project group can also refer to the document.

  • Page 5: Life 8 Summarize

    2. LIFE 8 Summarize LIFE 8 is a project developed on MTK(MT6592, 8 cores) Platform. The mainboard system is composed of RF part(MT6166),WIFI/BT/GPS part(MT6625) ,PMU parts(MT6322+MT6333) and BB part (MT6592). LIFE 8 supports six frequency bands, include GSM qual bands and WCDMA two bands.
  • Page 6 Product detail parameters as follow: Form Candybar, Android 4.2.2 GSM 850/900/1800/1900 MHz BAND WCDMA:900/2100MHz Hsdap+ hsupa Flash Memory (Bits) eMMC flash 8GB RAM (Bits) DDR2 8Gb Battery Li-ion 2000 mAh Talking time <=15 Hous Standby time Dual SIM card<=200 Hous Single SIM card<=240 Hous MP3 playback time <=7Hous, maximum volume...

  • Page 7: Life 8 Product Description

    LIFE 8 product description Product review...

  • Page 8: Assembly Components On Top Layer As Follow

    Assembly components on TOP layer as follow...

  • Page 9: Assembly Components On Bottom Layer As Follow

    Assembly components on Bottom layer as follow：...

  • Page 10: Life 8 Hardware Diagram

    LIFE 8 Hardware Diagram The HW Diagram as follow：...
  • Page 11 LIFE 8 Main Components of Mainboard parts CPU MT6592 Memory H9TP17ABLDMCNR-KGM RF 26M Crystal power amplifier and ASM SKY77590 G-sensor BMC150 RF Transceiver MT6166 X201 32.768K crystal RF connector U1402 Bluetooth/WIFI/FM/GPS J13 J12 SIM connector MT6625 Battery connector 3.5mm audio jack...

  • Page 12: Rf Parts

    3. RF PARTS Basic diagram: The RF part of LIFE 8 consists of a transiver (MT6166) and a PA (SKY77590). The two functions of the RF circuit as below: 1, The receiver circuit will receive the high frequency signal from the antenna, select out the necessary signals and demodulate them into I/Q signals, transmit them to the BB chip (MT6592).

  • Page 13: Tx Part Troubleshooting

    TX Part troubleshooting 3.2.1 TX process analysis The TX circuit is composed of two parts，modulation and power amplify circuit. The modulation circuit is composed of transceiver IC (MT6166). The power amplify circuit is include PA IC (SKY77590). First, Voice be converted to electric signal by microphone then input CPU IC After A/D (analog signal convert to digital signal) in CPU, became 64kbits/s dataflow, then going channel encode to 13kbits/s numerical audio dataflow, system encode again ,dataflow became 22.8bits/s, these processes were processed in DSP section.

  • Page 14: Tx Circuit Troubleshooting

    3.2.2 TX circuit troubleshooting Key parameters of TX circuit is “MAX power”, “TX current”, “Time mask”, “phase error”, “frequency error” etc. Following is normal analysis of circuit: Confirm the instrument for analysis is OK. a. Set up the voltmeter (power supply, voltage=3.8V-4.2V) and oscillograph. b.

  • Page 15: Tx Circuit Examine And Repair Flow Chart

    3.2.3 TX circuit examine and repair flow chart...

  • Page 16: Rx Circuit Troubleshooting

    RX Circuit troubleshooting 3.3.1 RX circuit analysis At first, The aerial signal of mobile phone received from antenna to RF connector, which is a special part developed for RF test. By connecting RF cable to analyze spectrum, you can measure the RF signal here. Signal from RF connector will be into the ASM which part in PA IC.

  • Page 17: Rf Part Examine And Repair

    Analog audio signal to Receiver 3.3.2 RF Part examine and Repair 3.3.2.1 Necessary condition First we need to define the failure kinds according to the failed item then we begin the analysis in details. Receiver key parameters include: RX Level, RX Quality, BER, FER etc. a.
  • Page 18 Step 2: If the signal of PA is right then measure if the signal output from PA is right. If the signal is wrong then check the PA and parts around of it, if no clear issue found then rework or change the PA IC. Step 3: If the signal out from PA is right then measure the if the input and output signal of transceiver are right, If the input signal of transceiver is wrong, please check the related RF circuit between transceiver and PA.

  • Page 19: Rx Examine And Repair Flow Chart

    3.3.3 RX examine and repair flow chart...

  • Page 20: Baseband Parts

    4. BASEBAND PARTS LIFE 8’s baseband is composed of MT6592. The MT6592 is the core chipset with responsibility for the power supply, keypad, LCD, audio, communication and the control of all parts of the system. The digital parts of the baseband are all the strengthen GSM/WCDMA processor with integrated channel encoder/decoder, complex/de-complex, encrypt/decrypt.

  • Page 21: Power On

    Power on 4.2.1 Normal Power On The normal way of power on is press the power on key, then the PWRKEY is pulled down and the system is powered on. At this time, all of the LDOs integrated in the PMU are started except the VSIM and the VCORE starts the reset timer.

  • Page 22: Charge Power On

    4.2.3 Charge Power On When the charger is plugged in, the system will also come into a special power on state. It is detected by the CHRIN of the PMU. 4.2.4 Phone cannot power on troubleshooting： 1. Measure “VBAT”, if the voltage is right then check the battery or power supply. You’d better use the power supply to observe the power on current.

  • Page 23: Earphone Circuit

    4.3.3 Earphone Circuit An earphone insert into the phone, right audio channel was from high level pull to low, take interrupt to CPU, so CPU “knew” the earphone was plugged in, then display “earphone plugged in”, this is earphone detect process. Earphone pull out is adverse process. After ear phone plugged in, MIC power supply will be turn on, so CPU read ADC2_MIC’s ADC value to check if earphone key was pressed.

  • Page 24: Vibration Issue

    Vibration issue: Vibrator is a DC motor, power supply is OK, then the vibrator is working. Vibrator circuit as follow: VIB pad In the circuit, CPU output high, the vibrator stop working, VIB output low, vibrator was working. If vibrator does not working, check vibrator soldering first, then check if the vibrator is a good part, check if VIB output is OK.

  • Page 25: Download Process

    Download process 4.5.1 NAND Flash Download LIFE 8 download software to phone by USB mode. First ,open the download tool and configuration the software then press the start button, connect the phone and computer by usb cable, press the volume down key don’t loosen, power supply the phone or insert the battery.

  • Page 26: Ctp Part

    5. Check if the issue caused by soldering process or performance of CPU. SIM card issue: LIFE 8 VSIM can supply 3.0V and 1.8V power, it base on SIM card type, that means if the SIM card is 1.8V supply, CPU will output 1.8V VSIM, if SIM card is 3.0V supply, CPU will output 3.0V VSIM.
  • Page 27 Charge function: PMU managed charge function and PMU integrated in CPU IC of LIFE 8 project. AC or USB charger plugged in from micro USB connector, VCHG signal into CPU so the CPU detect the charger plugged in, CPU output control signal to enable PMOS (U301), the charging current will go through PMOS (U301) and via a restense(R309) to battery.
  • Page 28 5. Defect description abbreviation Cold Solder Excess Solder Skewed Part Solder Short Tombstone Part Misaligned Part Open Trace Reversed Part Part Missing Direct Short Extra Part Damaged Part Wrong Part Bent Pin Component Defect Pretense Solder Insufficient Solder...
  • Page 29 6. The Tag This article described the examination and maintenance of the LIFE 8’s hardware. It should be modified in the later work for better. Thanks...

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