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G700-U10 Smartphone 
Maintenance Manual 

10 Circuit and Failure Analysis 

 

Issue 1.0 (2013-07-22) 

Huawei Proprietary and Confidential 

Copyright © Huawei Technologies Co., Ltd. 

85 

 

Circuit Analysis 

The 4-in-1 chip MT6628Q provides the Wi-Fi function. The Wi-Fi module in this chip uses 
the SDIO interface for signal transmission. The Wi-Fi antenna connects to the antenna on the 
phone housing through the spring J2301. The Wi-Fi module and Bluetooth module share the 
antenna. The external power supply provides the VBAT and 2.8 V voltages to the MT6628Q. 
The LDO inside the MT6628Q provides a 1.7 V voltage for the on-chip modules.   

Figure 10-59

 

MT6628Q structure 

 

 

Summary of Contents for G700-U10

Page 1: ...G700 U10 Smartphone Maintenance Manual Issue 1 0 Date 2013 07 22 HUAWEI TECHNOLOGIES CO LTD ...

Page 2: ...he customer All or part of the products services and features described in this document may not be within the purchase scope or the usage scope Unless otherwise specified in the contract all statements information and recommendations in this document are provided AS IS without warranties guarantees or representations of any kind either express or implied The information in this document is subjec...

Page 3: ...ent Issue 1 0 2013 07 22 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd ii 1 About This Document Author Prepared by Date Reviewed by Date Approved by Date Change History Date Version Change Reason Changed Chapter Description Author ...

Page 4: ...mation 3 4 Exploded View 4 5 Components Layout 6 5 1 PCBA 6 5 2 Proximity Sensor FPC 8 5 3 Speaker FPC 8 5 4 Component Lists 9 5 4 1 PCBA Components 9 5 4 2 Proximity Sensor FPC Components 13 5 4 3 Speaker FPC Components 13 6 Software Upgrade 15 6 1 Upgrade Preparation 15 6 2 Precautions 15 6 3 Installing the USB Driver 16 6 4 Upgrade Methods 16 6 4 1 Performing a USB Upgrade 16 6 4 2 Performing a...

Page 5: ...rcuits 54 10 4 1 LCD Circuit 54 10 4 2 TP Circuit 57 10 4 3 Front Camera Circuit 59 10 4 4 Rear Camera Circuit 61 10 4 5 G Sensor Circuit 63 10 4 6 3 in 1 Sensor Circuit 65 10 4 7 Key Circuit 66 10 4 8 Motor Circuit 68 10 4 9 Receiver Circuit 69 10 4 10 Microphone Circuit 71 10 4 11 Speaker Circuit 73 10 4 12 Headset Circuit 75 10 4 13 SIM Card Circuit 78 10 4 14 microSD Card Circuit 80 10 4 15 US...

Page 6: ...07 22 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 1 2 Product Overview 2 1 Appearance Figure 2 1 G700 U10 2 2 Product Specifications Table 2 1 G700 U10 specifications Item Description Dimensions 134 mm x 67 mm x 9 0 mm 5 28 in x 2 64 in x 0 35 in ...

Page 7: ... 5 V 1 A Battery 2150 mAh Li polymer battery Standby time more than 120 hours Talk time more than 180 minutes network dependent Display Resolution 1280 x 720 pixels LCD type TFT Color 16M LCD size 5 inches Interfaces Charging interface Micro USB port USB interface Micro USB port microSD card interface microSD card slot Headset interface 3 5 mm headset jack Maximum transmit power WCDMA 23 dBm GSM 3...

Page 8: ...y qualified technicians are allowed to perform maintenance and calibration Perform all operations in electrostatic discharge ESD rooms and wear ESD wrist straps throughout the operations Ensure that all the components screws and insulators are properly installed after maintenance and calibration and that all cables and wires are installed and connected correctly Ensure that the soldering is lead f...

Page 9: ...4 1 G700 U10 exploded view The components listed in Table 4 1 are structural parts of the phone and cannot be used as reference when requesting spare parts Table 4 1 Components in the exploded view No PN Description Quantity 1 51660EGF Battery cover 1 2 27161365 GPS antenna 1 3 27161364 Wi Fi antenna 1 4 14240155 SIM card 2 1 5 14240155 SIM card 1 1 6 23060108 Rear camera 1 ...

Page 10: ...oximity sensor rubber 1 9 23060111 Front camera 1 10 22030063 Receiver 1 11 51634472 TP protective film 1 12 23070282 TP LCD module 1 13 51660EFY Front cover 1 14 51634474 Antenna decoration 1 15 51634473 Front camera adhesive 1 16 03010UPG Volume key FPC 1 17 03022BEX Speaker FPC 1 18 03022ALM PCBA 1 19 03010UPH Power key FPC 1 20 22020111 Speaker 1 21 51660EGB Rear cover 1 22 27161363 Main anten...

Page 11: ... functional component Fault symptom reception failure X700 RF crystal oscillator Fault symptom startup failure U700 TD WCDMA baseband processing IC Fault symptom reception failure J901 battery connector Fault symptom startup failure X301 32 kHz crystal oscillator Fault symptom clock failure U401 CPU Fault symptom startup failure J1502 power key Fault symptom startup failure Shielding case Fault sy...

Page 12: ...n failure Compass Fault symptom compass failure Backlight driving IC Fault symptom backlight failure J1301 LCD BTB connector Fault symptom LCD failure J802 Speaker BTB connector Fault symptom motor failure speaker failure and keypad backlight failure J1501 side key ZIF socket Fault symptom volume key failure J1401 SIM card contacts Fault symptom SIM card detection failure J1402 SIM card contacts F...

Page 13: ...oprietary and Confidential Copyright Huawei Technologies Co Ltd 8 5 2 Proximity Sensor FPC Figure 5 3 Proximity sensor FPC 5 3 Speaker FPC Figure 5 4 Speaker FPC 3 in 1 sensor Fault symptom proximity sensor failure light sensor failure and IR sensor failure Motor Fault symptom motor failure ...

Page 14: ...R210 R3114 R404 and R801 4 15020111 LED 0 05cd 0 1cd 0 18cd B 470 R 632 G 525 n m 20mA SMD Terminal Dedicated D801 5 15040350 Constant Voltage Diode 5 1V 0 5W SOD123 Terminal Dedicated D902 6 15040264 Transient Suppressing Diodes 7 0V 15V 1A SOD882 0402 Terminal Dedicated D1105 D904 and D905 7 15040311 Transient Suppression Diode 6V 12V 50W 5A SOD923 D1103 D1104 D1111 D1112 D1113 D1501 D1502 and D...

Page 15: ... SD 8 PUSH PULL 1 1mm Det ect PIN J1403 17 14240151 FPC CONNECTOR 4pin 0 5pitch horizontal Termina l Dedicated J1501 18 51621024 WN9149 N83 7F W Antenna Spring U1250 J1502 J1503 J1601 J1602 J1616 J2302 J2305 and J3205 19 14240226 BTB Connector Female 50Pin 0 4mm Mating Height 1 0mm SMT Width 3 74mm After Mating Terminal Dedicated J1506 20 51621023 108 5785 Ground Spring U1250 J1614 21 51621274 DKB...

Page 16: ...XO2200 32 39200503 Terminal Baseband process IC PMIC Input range 3 4 4 3V Charger input of up to 10V TFBGA U201 33 39200511 Terminal Baseband process IC WSCDMA GSM BASEBAND PROCESSOR MT6589 1 2V 1 8V 2 8V 3 3V TFBGA 515 Ter minal Dedicated U401 34 39110756 Switching Regulators DC DC buck 2 5V 5 5V Voadj 1 2A DFN QFN U1001 and U2001 35 38140069 Semiconductor Sensor E Compass WLCSP Pb free 3axis Ter...

Page 17: ...1 8V 2 8V RF HBGA Terminal Dedicated U3101 46 47150274 RF Multi Functional Component Linear EDGE PAM Polar GPRS 2Tx 6TRx 824 849MHz 880 915MHz 1710 1785MHz 1850 1910MHz QFN Terminal Dedicated U3201 47 47100595 RF Power Amplifying Module 1920 1980MHz 28 5dB typ at Pout 28 25dBm for WCDMA 28 25dBm QFN Terminal Dedicated U3301 48 13080135 Duplexer 1920 1980MHz 2110 2170MHz 1 9d B 2 4dB 50dB 45dB 2016...

Page 18: ...nsor FPC Components Table 5 2 Components on the proximity sensor FPC No PN Description Location Number 1 14240459 BTB Connector male 10Pin 0 4mm 0 9mm SMT Ter minal Dedicated J101 2 38140032 Semiconductor Sensor APS ALS IR Sensor QFN8 Terminal Dedicated U101 5 4 3 Speaker FPC Components Table 5 3 Components on the speaker FPC No PN Description Location Number 1 15040311 Transient Suppression Diode...

Page 19: ...ht Huawei Technologies Co Ltd 14 No PN Description Location Number Diode 6V 12V 50W 5A SOD923 These component lists are for your reference only and subject to changes without notices The latest component lists are available in Huawei s BOM information system If you have any questions contact technical support in your region ...

Page 20: ...e tool HUAWEI THMTK6515ML02Ver1003 1312 Micro SD card 512 MB available space or more Battery Ensure that the battery used for the upgrade has sufficient power remaining Upgrade file Use the latest version for the upgrade Upgrading method Batch upgrade USB upgrade HUAWEI THMTK6515ML02Ver1003 1312 microSD card upgrade microSD card upgrade is recommended 6 2 Precautions Check that the battery has suf...

Page 21: ...For details see the guide 6 4 2 Performing a mircoSD Card Upgrade Step 1 Prepare the microSD card used for the upgrade 1 Format the microSD card using FAT32 2 Create a dload folder in the microSD card s root directory 3 Copy the upgrade package UPDATE APP to the dload folder Do not change the names for the upgrade package and folder A microSD card upgrade will erase the internal memory of the phon...

Page 22: ... 07 22 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 17 Figure 6 1 Engineering menu Step 3 Touch SD 卡升级 then 确定 The phone automatically restarts and displays the startup logo then the upgrade screen as shown in Figure 6 2 Figure 6 2 Upgrade screen ...

Page 23: ...stall the battery and power on the phone Figure 6 3 Upgrade succeeded End If an error occurs during the upgrade the screen shown in Figure 6 4 and the upgrade failure cause will be displayed If the upgrade failure cause is not displayed on the screen send the sdload log file in the dload folder to the R D personnel During a microSD upgrade some of the upgrade information is displayed on the screen...

Page 24: ... on the computer Check that the driver used for the upgrade has been properly installed Check that the USB cable has been properly connected to the computer and phone USB upgrade failure Check that the USB cable has been properly connected to the computer and phone Check that the USB driver has been properly installed Check that the upgrade file version is correct Perform the upgrade again microSD...

Page 25: ...oprietary and Confidential Copyright Huawei Technologies Co Ltd 20 7 Maintenance Tools Name heat gun Usage heats components Name heat gun Usage heats components Name soldering iron Usage solders components Name DC power supply Usage supplies power Name soldering fixture Usage secures PCBAs ...

Page 26: ...y and Confidential Copyright Huawei Technologies Co Ltd 21 Name lead free tin solder wire Usage solders components Name digital multimeter Usage measures parameters during maintenance Name toolkit Usage assembles and disassembles terminals Name electric screwdriver Usage fastens and removes screws ...

Page 27: ... Proprietary and Confidential Copyright Huawei Technologies Co Ltd 22 8 Disassembly Procedure 4 Remove the rear cover using the spudger 3 Remove the nine screws used to secures the rear cover to the front cover 2 Remove the battery cover 1 Ensure that the ESD wrist strap is properly grounded ...

Page 28: ...Technologies Co Ltd 23 10 Release the PCBA from the front cover 9 Open the ZIF socket and pull the volume key FPC out 8 Release the speaker BTB connector from the PCBA 7 Release the LCD BTB connector from the PCBA 6 Release the TP BTB connector from the PCBA 5 Release the rear camera BTB connector from the PCBA and remove the rear camera ...

Page 29: ...fidential Copyright Huawei Technologies Co Ltd 24 16 Remove the front camera conductive adhesive 15 Remove the front camera 14 Release the front camera BTB connector from the PCBA 13 Remove the proximity sensor FPC 12 Release the proximity sensor BTB connector from the PCBA 11 Remove the proximity sensor rubber ...

Page 30: ...00 U10 Smartphone Maintenance Manual 8 Disassembly Procedure Issue 1 0 2013 07 22 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 25 17 The phone is now successfully disassembled ...

Page 31: ...22 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 26 9 Assembly Procedure 4 Fasten the front camera BTB connector to the PCBA 3 Install the front camera 2 Attach the front camera conductive adhesive 1 Ensure that the ESD wrist strap is properly grounded ...

Page 32: ...the LCD BTB connector to the PCBA 9 Fasten the TP BTB connector to the PCBA 8 Install the PCBA to the front cover Ensure that the buckles two on the top and one at the bottom are properly fastened 7 Attach the proximity sensor rubber Pay attention to the direction of the rubber 6 Fasten the proximity sensor BTB connector to the PCBA 5 Install the proximity sensor FPC ...

Page 33: ...es Co Ltd 28 16 Install the battery cover and the phone is now successfully assembled 15 Tighten the nine screws 14 Install the rear cover assembly 13 Install the rear camera and fasten its BTB connector to the PCBA 12 Insert the volume key FPC into the ZIF socket on the PCBA and close the socket 11 Fasten the speaker BTB connector to the PCBA ...

Page 34: ...rcuit and Failure Analysis Before the maintenance restore the phone to its factory settings to ensure that the failure is not caused by environmental factors or incorrect functional settings 10 1 Solution Introduction Figure 10 1 Functional blocks of the G700 U10 The G700 U10 is a WCDMA bar type phone developed by Huawei based on the MT6589 MT6320 and RF chip MT6167 of MTK ...

Page 35: ...i Fi GPS and Bluetooth The LCD connects to the PCBA through the FPC the receiver and speaker connect to the PCBA through springs the motor and microphone are soldered to the PCBA the RF antenna connects to the PCBA through springs All the preceding components plus the covers and battery comprise a mobile phone The G700 U10 incorporates a 5 inch TFT LCD with a resolution of 1280 x 720 pixels The ph...

Page 36: ...equirements are met the system is powered on and reset After the power on process is completely carried out the baseband chip sends the PWRBB signal to the PM IC to confirm the startup of the system To ensure that the phone is properly powered on the PWRKEY signal should be kept low until the PM IC receives the PWRBB signal The RTC module outputs the PWRBB signal to wake up the system If the RTC i...

Page 37: ...tery When the battery voltage is high enough the system automatically starts up Figure 10 4 Power on sequence when a charger is inserted Troubleshooting Process To troubleshoot the startup failure check whether the I O interface battery connector is damaged If the I O interface is intact use a DC regulated power supply to supply power to the phone and test the phone s current The power on failures...

Page 38: ...current startup failures Connect the phone to a fake battery and maintenance power supply power on the phone and observe the current Is the power key FPC properly fastened to the PCBA No current Reconnect the power key FPC to the PCBA Is the power key FPC faulty Replace the power key FPC N Y N N Startup failure Is the voltage on R1502 between 3 4 V to 4 2 V Check U202 Y Resolder and replace U401 Y...

Page 39: ...ng weak current startup failures Connect the phone to a fake battery and maintenance power supply power on the phone and observe the current Are the VCORE VAPROC and VDD18 voltages normal Weak current Resolder or replace U202 Is X700 s output frequency 26 MHz Resolder or replace U401 Resolder or replace X700 Y N Y N Startup failure Reference voltage values VCORE 1 1 V VAPROC 1 2 V VDD18 1 8 V ...

Page 40: ... supply power on the phone and observe the current Is VBAT short circuited to the ground Excessive current Replace the faulty component Are the VCORE VAPROC and VDD18 short circuited Resolder or replace U202 Replace the faulty component N Y N Y Startup failure Circuit Signals Table 10 1 Circuit signals of this section Signal Description Reference Value or Waveform VBAT Battery voltage 3 2 V to 4 2...

Page 41: ...e in the MT6329 is used to control the charging for the phone The G700 U10 can be charged using chargers or USB cables connected to computers Charging principle VBUS passes through two resistors that work as the voltage divider and converts into VCDT If VCDT is detected the system determines that a charger is connected to the phone The CHR_LDO in the PM unit serves as a stabilizer to lock the volt...

Page 42: ...s used the charging current is about 70 mA If a charger is used the trickle charging current is 200 mA After the battery voltage reaches 3 3 V constant current charging starts The charging current in this process can be controlled by the phone software On the charger provided with the G700 U10 the triode is completely enabled to activate the charger s automatic current limiting function When the b...

Page 43: ...ial Copyright Huawei Technologies Co Ltd 38 Figure 10 9 Charging process Troubleshooting Process Fault symptom The charging failures may include the following types A charger is connected to the phone but the phone does not respond The phone displays the charging icon on the screen but in fact the battery fails to be charged ...

Page 44: ...lure Is J902 poorly soldered Resolder J902 Is R909 bearing a voltage Reload the software to the phone and restore the phone to its factory settings Are there CHR_LDO signals Replace Q302 Replace U201 N Y Y Y N N Is the battery damaged Replace the battery Y N Y Y Is the battery in good contact with the battery connector Repair J901 N Is the charger properly functioning Replace the charger N Y Circu...

Page 45: ...ght Huawei Technologies Co Ltd 40 Signal Description Reference Value or Waveform CHR_LDO Charging linear power supply 2 8 V ISENSE Charging current detection input VBAT A 0 2 ohm resistor R909 is added between ISENSE and VBAT to detect the charging current The phone software controls the charging process based on the charging current ...

Page 46: ...hone Maintenance Manual 10 Circuit and Failure Analysis Issue 1 0 2013 07 22 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 41 10 2 3 Clock Circuit Circuit Diagram Figure 10 11 Clock circuit ...

Page 47: ... circuit The 26 MHz crystal oscillator X700 provides clock for the MT6167 U700 The MT6167 then provides clock for the MT6589 The 26 MHz temperature compensation crystal oscillator TCXO2200 provides clock signals for the 4 in 1 chip MT6628Q U2200 The signal is used by the GPS module The clock signals output by the 32 kHz crystal pass the buffer and are then sent to the MT6320 and MT6628Q to keep th...

Page 48: ... or crystal oscillator N Y Are the crystal and crystal oscillator properly soldered Resolder the crystal and cyrstal oscillator N Y Resolder or replace the faulty clock IC Circuit Signals Table 10 3 Circuit signals of this section Signal Description Reference Value or Waveform 26 MHz crystal oscillator Provides clock signals for the MT6167 and then the MT6589 26 MH temperature compensation crystal...

Page 49: ...one Maintenance Manual 10 Circuit and Failure Analysis Issue 1 0 2013 07 22 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 44 10 2 4 Memory Circuit Circuit Diagram Figure 10 14 Memory circuit ...

Page 50: ...pply for the memory 1 8 V MC0CK Clock signals for the eMMC MC0CMD Command signals for the eMMC MC0RST Reset signals for the eMMC MC0DA 0 7 Data line for the eMMC 10 3 RF Subsystem The RF subsystem can be divided into RF transceiver MT6167 GSM PA BAND1 PA BAND 8 PA and 4 in 1 chip MT6628Q that includes the Wi Fi Bluetooth GPS and FM modules They are described in detail as follows The G700 U10 is a ...

Page 51: ...ual 10 Circuit and Failure Analysis Issue 1 0 2013 07 22 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 46 Figure 10 15 Platform structure 10 3 2 Receive Channel Circuit Diagram Figure 10 16 GSM PA and RF switch ...

Page 52: ... Manual 10 Circuit and Failure Analysis Issue 1 0 2013 07 22 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 47 Figure 10 17 Receive channel of the GSM 900 MHz and BAND 8 Figure 10 18 Receive channel of BAND1 ...

Page 53: ...phone Maintenance Manual 10 Circuit and Failure Analysis Issue 1 0 2013 07 22 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 48 Figure 10 19 Receive channels of the GSM 1800 MHz and 1900 MHz ...

Page 54: ...Co Ltd 49 Troubleshooting Process Figure 10 20 Troubleshooting reception failures Test the signal reception at the RF switch Is any component on the faulty circuit poorly soldered Determine the faulty band Re install the antenna Is there any missing component on the receive channel of each band Return the phone to Huawei for repair N Y N Reception failure Y ...

Page 55: ... 10 Circuit and Failure Analysis Issue 1 0 2013 07 22 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 50 10 3 3 Transmit Channel Circuit Diagram Figure 10 21 GSM transmit channel Figure 10 22 BAND1 transmit channel ...

Page 56: ...eshooting Process Figure 10 24 Troubleshooting transmission failures Test the signal reception at the RF switch Is there any component on the circuit of each band poorly soldered Re install the antenna Is there any missing component on the circuit of each band Return the phone to Huawei for repair N Y N Transmission failure Y Replace the RF front end U3201 Are signals of all bands not able to be r...

Page 57: ...shooting Process If no GPS signals can be received by the phone first check whether the antenna and antenna springs are properly connected If yes check whether the LNA back end has signals the GPS module has no RF switch use an RF cable for the inspection If not replace the LNA If the circuit has no missing component but the problem persists return the phone to Huawei for repair 10 3 5 Wi Fi Chann...

Page 58: ...d 53 Troubleshooting Process The Wi Fi module has no RF switch You need to use an RF cable to check the signal reception of each bands Pay special attention to the matching circuit behind the balun Make sure the two matching circuits are consistent If no component is missing on the Wi Fi circuit the 4 in 1 chip may be damaged Return the phone to Huawei for repair ...

Page 59: ...enance Manual 10 Circuit and Failure Analysis Issue 1 0 2013 07 22 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 54 10 4 Peripheral Circuits 10 4 1 LCD Circuit Circuit Diagram Figure 10 27 LCD circuit ...

Page 60: ...ght control signal LCD_CABC is used to enable the backlight driving chip U1301 when there is data transmitted to the LCD The location number U1301 indicates the backlight control chip TPS61161 VBAT passes through the boost circuit and converts into the backlight power supply signals VLED_A VLED_K1 and VLED_K2 The 5 inch LCD backlight uses ten LEDs divided into two groups LEDs in each group are con...

Page 61: ... differential signal MIPI_CLKN MIPI clock High speed digital differential signal MIPI_DATAP2 MIPI data line High speed digital differential signal MIPI_DATAN2 MIPI data line High speed digital differential signal MIPI_DATAP3 MIPI data line High speed digital differential signal MIPI_DATAN3 MIPI data line High speed digital differential signal LRSTB Reset signal effective when at low level Operatin...

Page 62: ...rtphone Maintenance Manual 10 Circuit and Failure Analysis Issue 1 0 2013 07 22 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 57 10 4 2 TP Circuit Circuit Diagram Figure 10 29 TP circuit ...

Page 63: ...1 and TP_ID0 signals that are used to detect the module manufacturer and other information Troubleshooting Process Figure 10 30 Troubleshooting touchscreen failures Touchscreen failure Is the power supply to the TP control IC normal Resolder or replace U1501 Y Is the I2C signal normal Is the I2C0 pull up resistor properly connected Replace the faulty components Y N Replace J1501 Is the TP control ...

Page 64: ...P_RST TP controller reset signal T Scan signal sent by the TP R Scan signal received by the TP TP_ID1 Manufacturer detection signal ID0 ID1 O Film GND GND Truly 1 0 TP_ID0 Manufacturer detection signal 10 4 3 Front Camera Circuit Circuit Diagram Figure 10 31 Front camera circuit Circuit Analysis The front camera supports a resolution of 1 3 mega pixels uses a 24 pin BTB connector and parallel inte...

Page 65: ...ormal Resolder or replace T1001 T1002 T1003 T1004 or T1005 N Y Y Circuit Signals Table 10 7 Circuit signals of this section Signal Description Reference Value or Waveform VCAM_AVDD Camera analog power supply 2 8 V VCAM_DOVDD Camera digital power supply 1 8 V SUBCAM_PDN Camera power supply enabling signal Effective when at high level operating SUBCAM_RST Camera initialization signal Effective when ...

Page 66: ...onfidential Copyright Huawei Technologies Co Ltd 61 10 4 4 Rear Camera Circuit Circuit Diagram Figure 10 33 Rear camera circuit Circuit Analysis The rear camera supports a resolution of 8 mega pixels uses a 24 pin BTB connector and MIPI interface to communicate with the PCBA and is controlled through the I2C data bus ...

Page 67: ... then check U202 N Y Is the MIPI signal normal Resolder or replace T1001 T1002 T1003 T1004 or T1005 N Y Y Circuit Signals Table 10 8 Circuit signals of this section Signal Description Reference Value or Waveform VCAM_AVDD Camera analog power supply 2 8 V VCAM_DOVDD Camera digital power supply 1 8 V VCAM_DVDD_DCDC Camera digital power supply 1 8 V VCAM_AFVDD Camera focusing motor s power supply 2 8...

Page 68: ... data signal High speed digital pulse signal MIPI_DATAN2 MIPI data signal High speed digital pulse signal MIPI_DATAP3 MIPI data signal High speed digital pulse signal MIPI_DATAN3 MIPI data signal High speed digital pulse signal SCL1 I2C control signal Digital pulse signal SDA1 I2C control signal Digital pulse signal MCAM_RST Camera initialization signal Effective when at low level The operating le...

Page 69: ...re VDD28_PMU and VDD18_PMU normal Replace U202 Y Is the G sensor chip normal Resolder or replace U1201 Y N N Resolder or replace U401 Circuit Signals Table 10 9 Circuit signals of this section Signal Description Reference Value or Waveform VDD18_PMU Sensor power supply 1 8 V VDD28_PMU Sensor power supply 2 8 V EINT3_G_SENSOR Interrupt signal Effective when at low level When no signal is transferri...

Page 70: ... The sensor U101 is a 3 in 1 sensor that has the light sensor proximity sensor and IR sensor integrated It transmits light proximity and IR sensing information to the CPU through the I2C0 data bus in real time EINT1_P_SENSOR is the interrupt signal Troubleshooting Process Figure 10 38 Troubleshooting light sensor failures Light sensor failure Is VDD28_PMU normal Check U202 Y Is the light sensor ch...

Page 71: ...cuit signals of this section Signal Description Reference Value or Waveform VDD28_PMU Sensor power supply 2 8 V EINT2_P_SENSOR Interrupt signal Effective when at low level When no signal is transferring the level is high SCL0 I2C signal used to read the light proximity and IR sensing information High and low pulses SDA0 High and low pulses 10 4 7 Key Circuit Circuit Diagram Figure 10 39 Key circui...

Page 72: ...as the bearer of the volume up and volume down keys the volume key FPC connects the keys to the CPU through the ZIF socket Troubleshooting Process Figure 10 40 Troubleshooting key failures Key failure Is the side key FPC normal Replace the side key FPC Y Is the ZIF connector normal Resolder or replace J1502 Y N N Resolder or replace U401 Circuit Signals Table 10 11 Circuit signals of this section ...

Page 73: ...it Diagram Figure 10 41 Motor circuit Circuit Analysis The motor is driven by the VIBR_PMU signal output by the MT6320 The chip provides auto switchover Therefore no external diode is required Troubleshooting Process Figure 10 42 Troubleshooting motor failures Motor failure Is the motor properly soldered Resolder the motor Y Is the motor normal Replace the motor Y N N Resolder or replace U202 ...

Page 74: ...iption Reference Value or Waveform VIBR_PMU Motor power supply driving signal 2 7 V 10 4 9 Receiver Circuit Circuit Diagram Figure 10 43 Receiver circuit Circuit Analysis The receiver is driven by the HSP and HSN differential signals output by the MT6589 The receiver connects to the PCBA through springs C1123 and C1124 filter the RF interference out and C1125 filters the differential interference ...

Page 75: ...g receiver failures Receiver failure Is the receiver normal Replace the receiver Y Is the receiver circuit normal Clear faults on the circuit Y N N Resolder or replace U401 Circuit Signals Table 10 13 Circuit signals of this section Signal Description Reference Value or Waveform HSN Differential input s negative electrode Analog differential signal HSP Differential input s positive electrode Analo...

Page 76: ...rcuit Circuit Diagram Figure 10 45 Microphone circuit Circuit Analysis The VMIC power supply output by the MT6589 provides bias voltage for the microphone Sound collected by the microphone are converted into MICP0 and MICN0 differential signals and sent to the CPU for processing C1120 and C1121 block the DC voltage R1106 is the bias resistor C1110 and C1111 filter the RF interference out ...

Page 77: ...ophone failure Is the microphone normal N Replace the microphone Y Is the microphone circuit normal N Clear faults on the circuit Y Replace U401 Circuit Signals Table 10 14 Circuit signals of this section Signal Description Reference Value or Waveform VMIC Microphone power supply 1 9 V MICP0 Differential signal input s positive electrode Analog differential signal MICN0 Differential signal input s...

Page 78: ...Huawei Technologies Co Ltd 73 10 4 11 Speaker Circuit Circuit Diagram Figure 10 47 Speaker circuit Circuit Analysis The speaker is driven by the SPK_P and SPK_N differential signals output by the MT6320 The speaker connects to the speaker FPC through springs C101 and C102 filter the RF interference out The speaker applies foolproof design ...

Page 79: ...ss Figure 10 48 Troubleshooting speaker failures Speaker failure Is the speaker normal N Replace the speaker Y Is the speaker circuit normal N Clear faults on the circuit Y Resolder or replace U201 Circuit Signals Table 10 15 Circuit signals of this section Signal Description Reference Value or Waveform SPK_P Differential signal input PWM signal SPK_N Differential signal input PWM signal ...

Page 80: ...it Analysis When a headset is inserted into the phone pin 4 of the headset connector is pulled down and an interrupt AUX2_EINT_HP is generated The MT6589 detects the interrupt determining that a headset has been inserted After you press the key on the headset EARBIAS outputs periodical square waves When EARBIAS is at high level the MT6589 detects the ACCDET pin If the pin is detected as low the ch...

Page 81: ...J1101 Y Are components on the left and right audio channels normal N Replace the faulty components Y Is any component on the earphone circuit short circuited to the ground N Clear faults on the circuit Y Replace U401 Figure 10 51 Troubleshooting headset microphone failures Headset microphone failure Is J1101 normal N Replace J1101 Y Is the EARBIAS voltage normal N Identify the cause and fix it Y I...

Page 82: ...18_PMU Headset insertion detection 1 8 V EARBIAS Headset microphone power supply 1 9 V EINT8_HP Interrupt detection signal Default 1 5 V Effective when at low level ACCDET Key pressing detection Default 1 5 V Effective when at low level HPLP Headset left channel Pulse signal HPRP Headset left channel Pulse signal MICN1 Negative electrode of the microphone differential signal Differential signal MI...

Page 83: ...es Co Ltd 78 10 4 13 SIM Card Circuit Circuit Diagram Figure 10 52 SIM card circuit Circuit Analysis The G700 U10 supports two SIM cards Figure 10 53 shows the SIM card circuit which is a common one that can be seen on basically every platform SCLK is the clock signal SRST is the reset signal VSIM_PMU is the power supply signal and SIO is the data signal ...

Page 84: ...0 53 Troubleshooting SIM card detection failures SIM card detection failure Is the SIM card properly functioning Replace the SIM card N Resolder or replace U401 Y Circuit Signals Table 10 17 Circuit signals of this section Signal Description Reference Value or Waveform SCLK Clock signal SRST Reset signal VSIM_PMU Voltage signal If the card can be detected the voltage should be 3 3 V SIO Data signa...

Page 85: ...ential Copyright Huawei Technologies Co Ltd 80 10 4 14 microSD Card Circuit Circuit Diagram Figure 10 54 microSD card circuit Circuit Analysis The microSD card holder is on the PCB and communicates with U401 through Z1401 Data transmission read and write to the microSD card complies with the standard microSD card protocol ...

Page 86: ...the microSD card holder Y Is the power supply to the microSD card normal Resolder or replace U201 Y N N Resolder or replace U401 Are the SD_DET and other signals normal Resolder or replace the faulty components N Y Circuit Signals Table 10 18 Circuit signals of this section Signal Description Reference Value or Waveform VMCH Power supply signal Normal voltage 3 3 V MC1CK Clock signal MC1CM0 Comman...

Page 87: ...ight Huawei Technologies Co Ltd 82 10 4 15 USB Port Circuit Circuit Diagram Figure 10 56 USB port circuit Circuit Analysis The USB port circuit is simple USB_DM and USB_DP are the data lines VUSB is the voltage signal which is 3 3 V KCOL0 is the USB download triggering signal When KCOL0 is grounded the system enters USB download mode ...

Page 88: ...he USB port Y Are the surrounding components of the USB port properly functioning Resolder or replace the surrounding components Y N N Resolder or replace U401 Circuit Signals Table 10 19 Circuit signals of this section Signal Description Reference Value or Waveform VBUS USB power supply The voltage is 3 3 V USB_DM USB data High speed digital pulse signal USB_DP USB data High speed digital pulse s...

Page 89: ...intenance Manual 10 Circuit and Failure Analysis Issue 1 0 2013 07 22 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 84 10 4 16 Wi Fi Module Circuit Circuit Diagram Figure 10 58 Wi Fi module circuit ...

Page 90: ... Wi Fi function The Wi Fi module in this chip uses the SDIO interface for signal transmission The Wi Fi antenna connects to the antenna on the phone housing through the spring J2301 The Wi Fi module and Bluetooth module share the antenna The external power supply provides the VBAT and 2 8 V voltages to the MT6628Q The LDO inside the MT6628Q provides a 1 7 V voltage for the on chip modules Figure 1...

Page 91: ...lder or replace U401 Circuit Signals Table 10 20 Circuit signals of this section Signal Description Reference Value or Waveform MC2_DAT0_6628 MC2DAT3_6628 Wi Fi data signal MC2_CMD_6628 Command signal MC2_CLK_6628 Clock signal WIFI_INT_B_6628 Reset signal 10 4 17 Bluetooth Module Circuit Circuit Diagram See section 10 4 16 Wi Fi Module Circuit for the module s circuit diagram Circuit Analysis The ...

Page 92: ...er or replace the surrounding components Y N N Resolder or replace U401 Circuit Signals Table 10 21 Circuit signals of this section Signal Description Reference Value or Waveform DAICLK Bluetooth clock signal DAISYNC PCM interface sync signal DAIPCMIN PCM interface input data DAIPCMOUT PCM interface output data UTXD3 UART interface used for BT GPS FM control signal URXD3 UART interface used for BT...

Page 93: ...re 10 62 Troubleshooting GPS failures GPS failure Is the 4 in 1 chip U2200 properly soldered Resolder U2200 Y Is the GPS antenna circuit normal Re install the antenna or resolder or replace the surrounding components and check that Z2302 and U2302 are properly soldered Y N N Resolder or replace U401 Circuit Signals Table 10 22 Circuit signals of this section Signal Description Reference Value or W...

Page 94: ... FM module employs the ground cable of the headset as its antenna Therefore the FM function is disabled when no headset is inserted into the phone The FM antenna applies differential signals to improve its anti interference capability Troubleshooting Process Figure 10 64 Troubleshooting FM failures FM signal reception failure Is the headset jack properly soldered Resolder or replace the headset ja...

Page 95: ...Copyright Huawei Technologies Co Ltd 90 Circuit Signals Table 10 23 Circuit signals of this section Signal Description Reference Value or Waveform FM_IN_L FM audio left channel signal FM_IN_R FM audio right channel signal I2S_DATA_IN_6628 FM I2S data signal I2S_CLK_6628 FM I2S clock signal I2S_WS_6628 FM I2S world select signal ...

Page 96: ...ips Issue 1 0 2013 07 22 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 91 11 Solder Points on the PCB and BGA Chips Red R 255 G 0 B 0 vacant point Green R 0 G 255 B 0 ground point Blue R 0 G 0 B 255 solder point Figure 11 1 Solder points on PCB side A ...

Page 97: ... Smartphone Maintenance Manual 11 Solder Points on the PCB and BGA Chips Issue 1 0 2013 07 22 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 92 Figure 11 2 Solder points on PCB side B ...

Page 98: ...ce Manual 12 Functional Tests Issue 1 0 2013 07 22 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 93 12 Functional Tests 12 1 Keys Figure 12 1 G700 U10 keys Home Menu Return Volume up Volume down Power key ...

Page 99: ...me down key A black screen is displayed Press the volume down key A color screen is displayed showing red green and blue strips 4 LCD backlight test 4 LCD backlight If the LCD backlight repeatedly turns on and off the LCD backlight is normal Press the volume down key to proceed 5 Keypad backlight test 5 Keypad LEDs If the keypad backlight repeatedly turns on and off the test item passes Press the ...

Page 100: ...ume down key to proceed 13 FM test 13 FM function After a headset is inserted the phone searches for and plays an FM channel If you hear the program from the headset the test item passes Press the volume down key to proceed 14 Headset wire control test 14 Headset When the headset is inserted into the phone the in icon on the test screen turns green when the headset is removed the out icon turns gr...

Page 101: ...t 20 SIM card test 20 SIM card If a SIM is inserted into the phone and functions properly the test item passes Press the volume down key to view the test results The MMI test is complete and the test results are displayed on the LCD 12 3 Voice Call Test Step 1 Install a UIM card and battery on the phone Step 2 Press and hold the power key to power on the phone Step 3 Check that the signal strength...

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