Blu LIFE 8 Service Manual Download Page 24 | Manualshive

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Blu LIFE 8 Service Manual Download Page 24

4.4 Vibration issue:

Vibrator is a DC motor, power supply is OK, then the vibrator 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, then check if the
vibrator is a good part, check if VIB output is OK.

VIB pad

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Summary of Contents for LIFE 8

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

Page 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...

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

Page 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...

Page 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...

Page 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...

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

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

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

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

Page 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...

Page 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...

Page 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...

Page 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...

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

Page 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...

Page 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...

Page 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...

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

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

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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