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BLU LIFE 8

SERVICE MANUAL

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Содержание LIFE 8

Страница 1: ...BLU LIFE 8 SERVICE MANUAL...

Страница 2: ...leshooting 13 4 2 1 TX process analysis 13 4 2 2 TX circuit troubleshooting 14 4 2 3 TX circuit examine and repair flow chart 15 4 3 RX Circuit troubleshooting 16 4 3 1 RX circuit analysis 16 4 3 2 RF...

Страница 3: ...5 10 Charge function 27 6 DEFECT DESCRIPTION ABBREVIATION 28 7 THE TAG 29...

Страница 4: ...ervice 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...

Страница 5: ...ds include GSM qual bands and WCDMA two bands Support GSM850MHz GSM900MHz DCS1800MHz PCS1900MHz WCDMA 900MHz and WCDMA2100MHz It is supports Dual cards two standby LIFE 8 size is 118 63 12mm with thre...

Страница 6: ...ime Dual SIM card 200 Hous Single SIM card 240 Hous MP3 playback time 7Hous maximum volume and speaker on Size 118 63 12mm Target weight 110g Mai LCD 5inch IPS 16Mega colors HD 1080 720 Antenna Intern...

Страница 7: ...2 1 LIFE 8 product description Product review...

Страница 8: ...2 2 Assembly components on TOP layer as follow...

Страница 9: ...2 3 Assembly components on Bottom layer as follow...

Страница 10: ...2 4 LIFE 8 Hardware Diagram The HW Diagram as follow...

Страница 11: ...r amplifier and ASM SKY77590 U37 G sensor BMC150 U22 RF Transceiver MT6166 X201 32 768K crystal J4 RF connector U1402 Bluetooth WIFI FM GPS IC MT6625 J13 J12 SIM connector J11 Battery connector J3 3 5...

Страница 12: ...m into I Q signals transmit them to the BB chip MT6592 2 The transmit circuit will modulate the I Q signals from the BB and amplify it then transmit it to the antenna The signal from MIC to CPU and tr...

Страница 13: ...MT6166 and then are modulated into RF signals after going through the PLL circuit and mix frequency circuit then amplify the RF signal The RF signals are sent out to PA SKY77590 Transceiver IC block d...

Страница 14: ...to transmitting state Note test on a good radio to get reference signal when you don t know if the signal is right You can depended on your experience to repair unlucky if you not enough experience yo...

Страница 15: ...3 2 3 TX circuit examine and repair flow chart...

Страница 16: ...four tracks I IB Q QB 67 708KHz Baseband signal to CPU The baseband signl demodulate by GMSK solution in CPU then creation data carries on to the deintertexture and decode etc become 22 8 kbits s of...

Страница 17: ...same to 8960 or CMU200 for example GSM CH 62 or Freq 902 4MHz TCH Level 60dbm DCS CH 700 or Freq 1747 4MHz TCH Level 60dbm control the phone to receiving state then check the result 3 3 2 2 Troublesh...

Страница 18: ...n 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 If the input signal of...

Страница 19: ...3 3 3 RX examine and repair flow chart...

Страница 20: ...encoder decoder complex de complex encrypt decrypt 4 1 Power Management Part Diagram The power management has the function of management of the charge and power supply The Power Management part is co...

Страница 21: ...gnal will be sent out H then the digital baseband will be also started That means the MT6592 go to the working states It will begin polling and detecting the state of the PWRKEY In case of the pulling...

Страница 22: ...memory IC 4 3 Audio Part troubleshooting 4 3 1 Speaker Circuit Because of CPU chipset integrated audio transducer hardware decoder and audio amplifier The audio PA type is class D which working at hig...

Страница 23: ...y was pressed If earphone key was pressed the ADC value was at low level otherwise was high 4 3 4 Receiver Circuit Analog audio signals from CPU via filter circuit to drive receiver then receiver prod...

Страница 24: ...brator is working Vibrator circuit as follow 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 th...

Страница 25: ...to GND observe the current about 30mA 120mA no software in memory or downloaded is OK LDOs output is OK also you d better to check the volume down key and the connection between PC and phone include U...

Страница 26: ...synchronizing signal check Pixel and frame clock also 5 Check if the issue caused by soldering process or performance of CPU 4 8 SIM card issue LIFE 8 VSIM can supply 3 0V and 1 8V power it base on SI...

Страница 27: ...rger is a good part or measure charger s output then check the connection between phone and charger Exclude external problem you need to check mainboard issue step by step First check the PMOS solderi...

Страница 28: ...s Solder SP Skewed Part SS Solder Short TP Tombstone Part MP Misaligned Part OT Open Trace RP Reversed Part PM Part Missing DS Direct Short EP Extra Part DP Damaged Part WP Wrong Part BP Bent Pin CD C...

Страница 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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