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BLU Products BLU VIVO IV, Service Manual

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BLU Products BLU VIVO IV Service Manual Download Page 10

 

                     

Page 10 of 22 

2.2.  Baseband part 

2.2.1 Block diagram of the Baseband part 

 

 

 

 

 

 

CPU 

MT6592V/W 

PMIC 

MT6322 

BATTERY 

CAMERA 

  FM

、

BT

、

WiFi

、

GPS 

LCD&CTP

 

KEYPAD 

MEMORY 

MT6166 

SKY77761-11

、

SKY77762-11

、

SKY77768-11

（

900MHZ

） 、

SKY77765-11

（

850MHZ

）

 

YDA168

B 

SPK 

HP 

REC 

single 

SIM 

CARD 

MIC 

Summary of Contents for BLU VIVO IV

Page 1: ...Page 1 of 22 BLU VIVO IV Service Manual...

Page 2: ...g Path Components 8 2 2 Baseband part 10 2 2 1 Block diagram of the Baseband part 10 2 2 2 Power Management 11 2 2 3 Audio Section 12 2 2 3 1 Audio Codec Circuit 12 2 2 3 2 MIC Receiver Loop 13 2 2 3...

Page 3: ...Audio CODEC PA YDA168B Memory SAMSUNG KMR8X0001M B608 TP IC Synaptics mXT 540S Peripheral Configuration LCD SAMSUNG 4 99 Backlight driver TI TPS65632A CAMERA 13 0MP AF rear 5 0MP FRT camera Memory ca...

Page 4: ...22 System Block Diagram CPU MT6592V W PMIC MT6322 BATTRY CAMERA FM BT WiFi GPS LCD CTP KEYPAD MEMORY MT6166 SKY77761 11 SKY77762 11 SKY77768 11 900MHZ SKY77765 11 850MHZ YDA168 B SPK HP REC single SIM...

Page 5: ...Page 5 of 22 1 2 Motherboard Components Distribution...

Page 6: ...Part 2 1 1 Block Diagram of the RF Section RF Block Diagram 2 1 2 Signal flow of the RF Transmitting Pa A N T PA Ant Switch SKY77761 11 SKY77762 11 SKY77768 11 900MHZ SKY77765 11 850MHZ Alternative 9...

Page 7: ...Check Transceiver to see if IQ signals exist Check the PA output to see if there is RF signal in the path Y Check CPU N Check RF coaxial switch or matching network Y Check the Transceiver to see if t...

Page 8: ...Page 8 of 22 2 1 2 Signal Flow of the RF Receiving Part 2 1 3 1 Receiving Path Components Receiving path is shown in the following figure Maintenance flow chart of the receiving Issues...

Page 9: ...Y Transceiver has received signal N Transceiver SDATA SCLK LE CXOEN are correct Y Check CPU N Whether the voltage of the transceiver is normal Whether 26MHZ is normal Y Check the corresponding power...

Page 10: ...t 2 2 1 Block diagram of the Baseband part CPU MT6592V W PMIC MT6322 BATTERY CAMERA FM BT WiFi GPS LCD CTP KEYPAD MEMORY MT6166 SKY77761 11 SKY77762 11 SKY77768 11 900MHZ SKY77765 11 850MHZ YDA168 B S...

Page 11: ...Page 11 of 22 2 2 2 Power Management The power management module is PMU IC MT6322 2 2 2 1 Mobile power supply system DC DC LDO...

Page 12: ...12 of 22 2 2 3 Audio Section 2 2 3 1 Audio Codec Circuit This phone applies YDA168B which is a class D and non crack noise YAMAHA amplifier to drive speaker Block diagram of the audio system is as be...

Page 13: ...st have a bias voltage in order to operate normally 2 0 0 1V When MIC is in good condition but loop MIC has no echo then you need to check the basic bias voltage signal of the MICBIASP and MICBIASSP t...

Page 14: ...work as shown below 2 2 3 3 Headset Loop Headset loop includes two signals Headset speaker and MIC If the headset fitting were in good condition when the headset plug in it appears abnormal such as Th...

Page 15: ...Page 15 of 22 FPC...

Page 16: ...ces between the system connector and the CPU NO Connect the download cable then observe the Ammeter to see if it shows high current The normal current generally about 30mA Yes Quickly disconnect the c...

Page 17: ...ort circuit the equivalent of a long pressing this button At this point you should analyze the following first Check the connector external exclusion and varistor to see if they are short circuit Then...

Page 18: ...Page 18 of 22 2 2 4 2 Analysis of Display module circuit Display module use the 4 99 AMOLED LCD 2 2 4 3 FM Module FM adopts the design of MT 6632...

Page 19: ...pixel rear camera connecting to baseband chip through connector The welding of the connector is the main reason for the camera malfunction Camera Interface Circuit Power supply circuit VCAMD_IO_PMU f...

Page 20: ...f 22 2 2 4 5 IO Interface IO applies 5pin standard interface which realize the functions of USB charging and download 2 2 4 6 SIM Card Circuit Switch of dual SIM cards is integrated into baseband SIM...

Page 21: ...Page 21 of 22 2 2 4 7 BT WIFI GPS Circuit BT WiFi GPS are integrated into MT6625 2 2 4 8 G sensor Circuit...

Page 22: ...Page 22 of 22 2 2 4 9 M sensor Circuit 2 2 4 10 Gyroscope Circuit...

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