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U8655
Maintenance Manual

9 Principles and Failure Analysis

Issue 1.0 (2012-02-23)

Huawei Proprietary and Confidential

Copyright © Huawei Technologies Co., Ltd.

24

Subsystem Module

Unit

Function

GPS

GPS reception

Receives and processes GPS signals.
Mainly includes the RTR6285A chip and the
peripheral circuit.

Bluetooth
interface

Bluetooth/Wi-Fi/FM
3-in-1 module

Performs baseband functions for Bluetooth, Wi-Fi
and FM signals.

Transmits and receives Bluetooth, Wi-Fi and FM
signals.

Mainly includes the Bluetooth/Wi-Fi/FM module
and its peripheral circuit.

Wi-Fi interface

Same as the
Bluetooth interface

Same as the Bluetooth interface

Oscillator and
frequency
synthesizer

Crystal oscillators

Generates highly accurate VCTCXO frequency for
the 19.2 MHz local reference clock. The RTR6285A
has a built-in local oscillator (LO) providing clock
frequency for transmitting and receiving WCDMA
and GPS signals.

Antenna

External antenna,
internal interface
component, antenna
protection

The phone uses internal antennas for wireless
communication, supporting WCDMA high and low
frequency bands.

The antennas are the main antenna, GPS antenna,
diversity antenna, Wi-Fi/Bluetooth antenna, and FM
antenna (headset).

Coupler

Power coupler

Couples part of the power output from the WCDMA
power amplifier to the RTR6285A for power
monitoring.

User
interface
subsystem

UART interface

MSM7225A subsystem's UART1 interface for
Bluetooth.

USB interface

Driver, protection
circuit, output
interface component

The peripheral circuit, protection circuit and
interface connectors of the USB interface in the
MSM7225A subsystem.

It is the major data service channel for the
engineering sample, and can be used to debug and
test devices during R&D.

USIM card
interface

Power supply,
protection circuit,
USIM card holder

Mainly includes the USIM card holder and related
connection circuits.

Keypad and
backlight

Keypad driver
circuit, external
keypad, backlight
LED control circuit

Supports GPIO for keypad scanning.

Provides backlight LED. When a key is pressed, the
backlight is on.
Works in conjunction with PM8029 to provide the
keypad backlight brightness adjustment function.

Color LCD and
backlight

LCD driver, interface
mode, and backlight
control

The phone's LCD with 256K colors. The brightness
of the LCD backlight can be adjusted by users.

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Содержание U8666

Страница 1: ...U8666 Maintenance Manual Issue 1 0 Date 2012 05 14 HUAWEI TECHNOLOGIES CO LTD ...

Страница 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...

Страница 3: ...uawei Technologies Co Ltd ii About This Document Purpose Prepared by R D Date 2012 05 14 Reviewed by Maintenance support team Date 2012 05 14 Approved by Service representative Date 2012 05 14 Change History Date Version Change Reason Revised Section Description Author 2012 05 14 V1 0 Released the first issue R D ...

Страница 4: ...Information 4 3 Exploded View 5 4 Components on the PCBA 7 5 Software Upgrade 9 5 1 Upgrade Preparation 9 5 2 Upgrade Procedure 9 6 Maintenance Tools 11 7 Disassembly Procedure 13 8 Assembly Procedure 18 9 Principles and Failure Analysis 22 9 1 Block Diagram 22 9 1 1 Function Description of the PCBA 23 9 2 Baseband Unit 26 9 2 1 Power on Management Circuits 26 9 2 2 Charging Management Circuits 30...

Страница 5: ...tor and Touch Key Backlight Circuits 44 9 4 7 Battery Connector 45 9 4 8 Accelerometer Circuit 46 9 4 9 Compass 46 9 4 10 Proximity and Illuminance Sensor 47 9 4 11 Vibration Motor 48 9 4 12 Receiver 49 9 4 13 Microphone 52 9 4 14 Touchscreen Panel 53 9 4 15 SIM Card 54 9 4 16 microSD Card 55 10 Solder Points on the PCB and BGA Chip 57 11 Functional Tests 62 11 1 MMI Test 62 11 2 Voice Call Test 6...

Страница 6: ... Introduction Issue 1 0 2012 02 23 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 1 1 Product Introduction 1 1 Appearance 1 2 Specifications Category Description Dimensions H x W x D 116 mm L 61 mm W 11 7 mm T ...

Страница 7: ... U8666 51 WCDMA 850 MHz 824 849 MHz UL 869 894 MHz DL WCDMA 1900 MHz 1850 1910 MHz UL 1930 1990 MHz DL WCDMA 2100 MHz 1920 1980 MHz UL 2110 2170 MHz DL GSM 850 MHz 824 849 MHz UL 869 894 MHz DL GSM 900 MHz 880 915 MHz UL 925 960 MHz DL GSM 1800 MHz 1710 1785 MHz UL 1805 1880 MHz DL GSM 1900 MHz 1850 1910 MHz UL 1930 1990 MHz DL Weight 115 g with battery Form factor Bar Antenna Built in UIM SIM USI...

Страница 8: ...ei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 3 Category Description Maximum transmission power 23 33 dBm Static sensitivity 104 dBm Temperature Operating temperature 10 C to 55 C Storage temperature 40 C to 70 C Humidity Operating humidity 5 to 95 RH ...

Страница 9: ...ice 2 2 Precautions Only qualified technicians are allowed to perform repair and calibration Perform all operations in electrostatic discharge ESD rooms and wear ESD wrist straps throughout the operations Ensure that all components screws and insulators are properly installed after repair and calibration and that all cables and wires are installed and connected correctly Ensure that the soldering ...

Страница 10: ...Huawei Technologies Co Ltd 5 3 Exploded View The components listed in the following table are structural parts of the phone and cannot be used as reference when requesting spare parts Table 3 1 List of components in the exploded view drawing No Item Quantity 1 U8666_TP protective film 1 2 U8666_TP Lens 1 1 5 ...

Страница 11: ...amera 1 12 U8666_Speaker dust net 1 13 U8666_Back MIC pouches 1 14 U8666_Camera trim 2 15 U8666_Speaker 1 16 U8666_Speaker shielding 1 17 U8666_SIM card bracket 1 18 U8666_Anntena cover 1 19 U8666_Belt 1 20 U8666_Back cover 1 21 U8666_CPU shielding cover 1 22 U8666_ Battery cover 1 23 U8666_Battery 1 24 U8666_Front foam of speaker 1 25 U8666_PA shielding cover 1 26 U8666_Volume key FPC 1 27 U8666_...

Страница 12: ... Failure of this component can cause Vibration failure U3201 RF connector Failure of this component can cause RF failure J1601 BTB connector Failure of this component can cause Touchscreen panel failure U1402 SD card filter Failure of this component can cause SD card failure J1302 BTB connector Failure of this component can cause Display failure U1303 Voltage Regulator Failure of this component ca...

Страница 13: ...z transmission and reception failure U1207 proximity and illuminance sensor Failure of this component can cause Proximity and illuminance detection failure U3401 power module PA Failure of this component can cause W900 MHz transmission failure J901 IO connector Failure of this component can cause Charging failure data communication failure U901 DC DC control chip Failure of this component can caus...

Страница 14: ...de pack vendor_XXX_XXX UPDATE APP Upgrade method Using the microSD card Normal upgrade Forcible upgrade 5 2 Upgrade Procedure 1 Format the microSD card 2 Create a folder named dload in the root directory of the microSD card 3 Copy the upgrade file to the dload folder 4 Install the microSD card on the phone Power the phone on and enter 2846579 on the idle screen 5 Select SD Upgrade then Yes to star...

Страница 15: ...bly upgrade the phone Install the battery on the phone if the screen is jittering remove the battery and wait for five seconds before installing the battery again Press and hold the Volume and Volume keys and press the Power key The phone enters the SD forcible upgrade mode in which the upgrade process is similar to the normal upgrade While the phone has no battery installed press and hold the Vol...

Страница 16: ...hnologies Co Ltd 11 6 Maintenance Tools Name constant temperature hot air blower gun Usage to heat components Name constant temperature heat gun Usage to heat components Name soldering iron Usage to solder components Name DC regulated power supply Usage to supply DC power Name soldering table Usage to secure the main PCBA ...

Страница 17: ...ietary and Confidential Copyright Huawei Technologies Co Ltd 12 Name lead free solder wire Usage soldering Name digital multimeter Usage to measure during repair Name toolkit Usage to assemble and disassemble components Name electric screwdriver Usage to fasten and remove screws ...

Страница 18: ...ei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 13 7 Disassembly Procedure 1 Wear an ESD wrist strap and ensure that the strap is grounded properly 2 Remove the battery cover Pushed down from the upper part of 3 Remove the battery U8666 before disassembly ...

Страница 19: ...Huawei Technologies Co Ltd 14 4 Remove the antenna cover Disassemble paddles inserted from the top left open here buckle 5 First remove the antenna cover after the abolition of the SIM card holder 6 Remove the six screws from the shell 7 Disassemble paddles inserted from the bottom left corner after the bayonet apart ...

Страница 20: ...elease the two latches in the PCBA 12 Disconnect the BTB connector cable between the touchscreen panel and the LCD 8 Use disassemble paddles inserted from the bottom right corner will snap apart 9 Open shell device directly to the buckle to release the front shell after shell open the back cover 10 Remove the volume key 11 Release the volume key FPC ...

Страница 21: ...dential Copyright Huawei Technologies Co Ltd 16 16 Release the BTB connector and remove the camera Release the ZIF connector and remove the volume key FPC 15 Remove the proximity and illuminance sensor sheath and the microphone sheath 14 Remove the PCBA 17 Release the LCD latches and remove the LCD ...

Страница 22: ...oprietary and Confidential Copyright Huawei Technologies Co Ltd 17 21 Remove the receiver 18 Apply a protective film on the LCD 22 Remove the speaker 23 The phone is now disassembled 19 Apply a protective film on the inner side of the touch screen panel 20 Remove the Power key FPC ...

Страница 23: ...uawei Technologies Co Ltd 18 8 Assembly Procedure U8666 before assembly 1 Wear an ESD wrist strap and ensure that the strap is grounded properly 2 Install the camera on the PCBA and snap the BTB connector in place Install the volume key FPC into the ZIF connector and attach the adhesive film 3 Install the receiver ...

Страница 24: ...key FPC 5 Remove the protective film from the touchscreen panel 6 Remove the protective film from the LCD 7 Install the LCD Ensure that the two latches are snapped in place and that the LCD is even 8 Assembled motherboard The motherboard in accordance with the bottom of the positioning hole is loaded 9 Gently press the PCBA to close the latches to secure the PCBA ...

Страница 25: ...l the six screws into cover B 10 Snap the LCD s BTB connector and then the touchscreen panel s BTB connector in place 11 Install the volume key Attach the volume key FPC to the metal piece on cover A and then install the volume key 12 Install the speaker 15 Install SIM card bracket 13 Install cover B Firstly install from bottom side then press top side ...

Страница 26: ... 1 0 2012 02 23 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 21 16 Install the antenna cover the pressure mount location makes installation smooth 17 Install battery 19 The phone is now assembled 18 Install the battery cover ...

Страница 27: ...e U8666 uses the MSM7225A is the baseband signal processing chip mainly responsible for processing the input and output of IMGE VIDEO AUDIO MEMEO SUPPORT RF INTERFACES and CONECTIVITY signals The baseband chip provides keypad LCD SD card Wi Fi Bluetooth camera and microphone interfaces The PM8029 is mainly responsible for Detecting the connection and disconnection of the external power supply Supp...

Страница 28: ...odulation of WCDMA GPS and GSM signals Application subsystem The subsystem includes ARM A5 processor application DSP and dedicated data mover The A5 processor has a clock rate of 800 MHz supporting function modules such as the microSD card EBI2 UART USIM I2C GPIO and clock modules User interface processing unit Provides camera PCM broadband codec vocoder RF HKADC LCD SD card USB UART USIM card SBI...

Страница 29: ... high and low frequency bands The antennas are the main antenna GPS antenna diversity antenna Wi Fi Bluetooth antenna and FM antenna headset Coupler Power coupler Couples part of the power output from the WCDMA power amplifier to the RTR6285A for power monitoring User interface subsystem UART interface MSM7225A subsystem s UART1 interface for Bluetooth USB interface Driver protection circuit outpu...

Страница 30: ...here is an incoming call the motor can vibrate notify the user of the call NFC I2C interface control Performs proximity sensing function Proximity and illuminance sensor I2C interface control Senses the intensity of environmental light for adjusting the LCD and keypad backlight brightness Detects the distance between the phone and the user s skin and turns the LCD and touchscreen panel off when th...

Страница 31: ...power saving analysis the board software manages the power supplies to the units on the board to reduce power consumption RTC The built in RTC circuit uses a sleep clock of 32 768 kHz to provide precise time HKADC Contains 8 MPP interfaces Analog to digital conversion can be implemented inside the PM8029 TCXO driver The PM8029 has a built in TCXO driver providing two analog signal output channels ...

Страница 32: ...al of 24 output channels The follow table lists the voltage regulator parameters Table 9 2 Voltage regulator specifications Troubleshooting Process To troubleshoot the power on failure firstly check whether the I O connector battery connector is damaged If the I O connector battery connector is not damaged use a DC regulated power supply to supply power to the phone and test the phone s current Th...

Страница 33: ... on failure no current Is the battery connector J902 normal Replace Q201 N Is Q201 normal Y Re solder or replace U201 Y Weak current Figure 9 1 U201 X301 U201 VREG_S3 Test C235 1 8V U201 VREG_S4 Test C202 2 3V U201 VREG_S2 Test L202 1 1V U201 VREG_S1 Test L201 1 1V U201 VREG_L3 Test C203 1 2V U201 VREG_L4 Test C204 1 1V U201 VREG_L9 Test C221 1 8V X301 OUT Test Pin2 32 768KHz ...

Страница 34: ...U210 s output voltage normal Replace U201 N N Replace U401 N Does X301 have 32 768 kHz output Replace U601 and reinstall the phone s firmware Is the problem solved Y Replace X301 N End Y Y Excessive current Excessive current is caused by short circuits When excessive current occurs to prevent damage to components do not connect the charger to the phone Power on failure due to excessive current is ...

Страница 35: ...logies Co Ltd 30 Check whether VPH_PWR and PM outputs are short circuited N Power on failure excessive current Test the VBAT circu it Is it a short circuit Is J902 normal Re solder or replace J902 N Y Replace U401 N Is Q202 normal Remove U201 Do short circuits still exist Y Replace Q202 N Replace U201 Y Y 9 2 2 Charging Management Circuits ...

Страница 36: ...ith the battery connector End Does VPH_PWR have voltages Repair or replace J902 Replace U901 N Y Y Y N N Is the battery damaged Replace the battery Y N Y Y Is there voltage difference between Q202 pin 2 and pin 3 Replace Q202 N Is the charger working properly Replace the charger N Y 9 3 RF Unit 9 3 1 RF Failure Troubleshooting Transmission Failure GSM DCS transmission failure Before starting the f...

Страница 37: ...put and DCS output approximately 33 dBm and 30 dBm respectively Check U3202 and U401 Check U3501 Y N Y Y Y N N Do U3801 s pin A10 and pin A9 have output Check U3801 N Y NOTE The following tables describe the working status of the GSM DCS power amplifier U3501 GSM_PA_EN PA H ON L OFF GSM_PA_BAND MODE L GSM850 900 H DCS1800 1900 H voltage higher than 1 3 V L voltage lower than 0 5 V WCDMA transmissi...

Страница 38: ...ontrol signals normal Check U401 Is the insertion loss between U3304 s pin 1 and pin 3 approximately 1 1 1 4 dB Check U3202 and U401 Check U3304 Y N Y Y Y N N Is U3301 s output 24 dB Check U3301 N Y Y Y Is the insertion loss between U3302 s pin 2 and pin 9 approximately 0 6 dB Check U3302 N Check U3801 N Does U3801 s pin A7 have output NOTE The following tables describe the working status of the W...

Страница 39: ...functions share one antenna and one SP3T RF switch The MSM7225A provides PCM and UART interfaces that are directly connected with the Bluetooth module s PCM and UART signal output The following table describes the signals definitions MSM7225A Signal Definition GPIO_44 UART1_CTS_N The ready to receive signal from the host the MSM7225A to the slave the BCM4330 GPIO_43 UART1_RFR_N The clear to send s...

Страница 40: ... The following table describes the signals definitions BCM4330 Network MSM7225A Description FM_RXP FM_ANT FM antenna headset FM_RXN FM_VDD2P5 SR_AVDD2P5 FM_AOUT1 FM_OUT_L PM8029 LINE_IN_LP FM OUTPUT FM_AOUT2 FM_OUT_R PM8029 LINE_IN_RM FM OUTPUT 9 4 Peripheral Circuits 9 4 1 Display The MSM7225A uses MIPI interfaces to send instructions and data to the LCD The U8666 s LCD uses MIPI interfaces suppo...

Страница 41: ...zation signal Frame synchronization clock MDP_VSYNC_P GPIO97 Clock signal MIPI clock MIPI_DSI_CLK_P MIPI_DSI_CLK_P MIPI clock MIPI_DSI_CLK_N MIPI_DSI_CLK_N Control signal Reset signal LCD_RESET_N GPIO129 Identification signal LCD model identification LCD_ID0 GPIO9 PM8029 LCD model identification LCD_ID1 GPIO10 PM8029 U8666 s LCD backlight control The U8666 uses a 3 5 inch LCD whose backlight is pr...

Страница 42: ...ht Huawei Technologies Co Ltd 37 Backlight signals The anode of the backlight LED LED_A The anode of the backlight LED The cathode of the backlight LED LED_K The cathode of the backlight LED Brightness control signals from the LCD PWM_OUT Reserved Brightness control signals from the phone s main chip LCD_BL_PWM GPIO1 PM8029 ...

Страница 43: ...to the factory Check whether J1302is snapped in place If it is not in place snap it again Is the problem solved End Y N Reinstall the phone s firmware Is the problem solved End Y N Replace the LCD Is the problem solved End Y N 9 4 2 Camera The U8666 uses a 3 2 megapixel full frame camera The 3 2 megapixel full frame camera uses a 24 pin BTB connector and is controlled by the I2C bus The data is tr...

Страница 44: ... Camera autofocus motor control signal I2C0_SCL GPIO_060 MSM7225A 1 8 I2C control signal I2C0_SDA GPIO_061 MSM7225A 1 8 MCAMIF_RESET GPIO_049 MSM7225A 1 8 Reset signal MCAMIF_ID GPIO_9 MSM7225A 1 8 Module supplier identification MIPI_CSI2_CLK_P MIPI_CSI2_CLK_P MIPI clock MIPI_CSI2_CLK_N MIPI_CSI2_CLK_N MIPI clock MIPI_CSI2_LANE1_P MIPI_CSI2_LANE1_P Data communication signal MIPI_CSI2_LANE1_N MIPI_...

Страница 45: ...logies Co Ltd 40 Troubleshooting Camera Failure Failure to take photos or record video using the camera Replace the camera Is the problem solved End Is J1001 poorly soldered or are its contacts defective Return the phone to the factory Re solder or replace J1001 Y N Y Reinstall the phone s firmware Is the problem solved End Y N N 9 4 3 USB ...

Страница 46: ...N N 9 4 4 Headset Jack The headset jack is a 3 5 mm headset jack When the headset jack has no headset inserted the headset jack s pin 3 and pin 4 are open and the headset detection voltage is at high level After a headset is inserted pin 3 and pin 4 are closed and the headset detection voltage is at low level indicating the insertion of a headset The HS_DETECT GPIO86 pin is used to detect the head...

Страница 47: ...und comes from the headset during a call After a call is established no sound can be heard from the headset Is a headset icon displayed on the screen Replace the headset jack Replace the headset Is the problem solved Return the phone to the factory End Y Y N Is the in call volume set to a normal level End N N Y The headset button cannot be used to answer a call ...

Страница 48: ... to the factory Check that J1101 is properly soldered N Replace the headset Is the problem solv ed End Y Y N 9 4 5 Keys The U8666 has six keys three of which are the Menu Home and Back keys on the touchscreen panel The MSM7225A s GPIO_42 and GPIO_41 pins are connected to the volume up and down keys The side key FPC is connected to the PCBA via the ZIF connector J1605 The Power key press is detecte...

Страница 49: ...klight Circuits The U8666 s status indicator tricolor indicator provides red green and blue light sources that are driven by the PM8029 s three LED drivers Light Source Driver Pin PM8029 Description Red LED_RED_DRV_N MPP3 Adjusted using electric current Green LED_GREEN_DRV_N MPP5 Adjusted using electric current Blue LED_BLUE_DRV_N MPP8 Adjusted using electric current The KYPD_DRV_N PM8029 is used ...

Страница 50: ...02 23 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 45 Keypad Backlight Driver VPH_PWR Power supply Backlight power supply KPD_DRV_N Backlight driver pin When this pin s voltage is at low level the two backlight LEDs turns on 9 4 7 Battery Connector ...

Страница 51: ...d Confidential Copyright Huawei Technologies Co Ltd 46 9 4 8 Accelerometer Component Pin Network MSM7225A Pin Description SCL I2C1_SCL GPIO_131 I2C bus SDA I2C1_SDA GPIO_132 INT1 MEMS_INT1 GPIO_28 Accelerometer interrupt signal INT2 MEMS_INT2 GPIO_111 Accelerometer interrupt signal sleep 9 4 9 Compass ...

Страница 52: ...DA I2C1_SDA GPIO_132 DRDY COMPASS_INT GPIO_18 Compass interrupt signal 9 4 10 Proximity and Illuminance Sensor The U8666 has a proximity and illuminance sensor The following figure shows the sensor circuit Component Pin Network MSM7225A 0 Pin Description SCL I2C1_SCL GPIO_131 I2C bus SDA I2C1_SDA GPIO_132 INT PRO_INT GPIO_17 3 in 1 interrupt signal Functions Detect the intensity of environmental l...

Страница 53: ...s not turn off when near the user s ear during a call Is U1207 poorly soldered or dirty Re solder clean or replace U1207 Reinstall the phone s firmware Is the problem solved Return the phone to the factory End Y N Y Is the touchscreen panel s illuminance sensorhole dirty or blocked Clean the hole Y N N 9 4 11 Vibration Motor The motor driver current is controlled by PM VIB_DRV_N ...

Страница 54: ...Vibration Failure Vibration failure Is the voltage on VIB_DRV_N equal to the battery voltage Replace D902 Replace the motor Is the problem solved Return the phone to the factory End Y N Y Reinstall the phone s firmware Is the problem solved End Y N N 9 4 12 Receiver The receiver receives differential earphone output from the MSM chip The following figure shows the circuit ...

Страница 55: ...Co Ltd 50 The MSM chip s EARI output signal is connected to the receiver Bypass capacitors are added to the signal traces The circuit shown in the previous figure is designed for compatibility L1508 L1510 and U1501 are reserved for the HAC function and are not soldered on the U8666 D1503 and D1504 are the ESD protection components on the receiver ...

Страница 56: ...ies Co Ltd 51 Troubleshooting the Failure that No Sound Can Be Heard During a Call No sound is heard during a call Replace the receiver Is the problem solved End Does the phone mistakenly detect the insertion of a headset Return the phone to the factory Replace the headset connector Y N Y Is the in call volume set to a normal level End N N Y ...

Страница 57: ...U8655 Maintenance Manual 9 Principles and Failure Analysis Issue 1 0 2012 02 23 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 52 9 4 13 Microphone ...

Страница 58: ...oblem solved End Is the MIC_BIAS voltage equal to 1 8 V Return the phone to the factory Check U201 N N Y Reinstall the phone s firmware Is the problem solved End Y Y N 9 4 14 Touchscreen Panel The U8666 s 3 5 inch capacitive touchscreen panel has a touch key area containing three touch keys The backlight LEDs for the three touch keys are located on the PCBA A light guide film is used to guide ligh...

Страница 59: ...signal 9 4 15 SIM Card The MSM7225A is not compatible with the SIM card interface The PM8029 s MPP pins are used to convert voltage levels of the signals for communication between the MSM7225A and the SIM card The voltage of VREG_L16_UIM1 can be set to 1 5 3 05 V The USIM interface s operating voltage is usually 1 8 V or 3 0 V The following table describes the voltage level conversion interface of...

Страница 60: ...4 16 microSD Card The microSD card connector s SD_DETECT pin is used to detect the insertion of a microSD card When a microSD card is inserted the pin is grounded and its voltage is at low level When no microSD is inserted its voltage is at high level The U1402 is an EMI and ESD protection component for the microSD card The following figure shows the circuit ...

Страница 61: ...U8655 Maintenance Manual 9 Principles and Failure Analysis Issue 1 0 2012 02 23 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 56 ...

Страница 62: ...02 23 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 57 10 Solder Points on the PCB and BGA Chip 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 Magnified views of sections PM section MSM7225A NAND MCP section ...

Страница 63: ...655 Maintenance Manual 10 Solder Points on the PCB and BGA Chip Issue 1 0 2012 02 23 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 58 Wi Fi Bluetooth FM section RTR8285A section ...

Страница 64: ...U8655 Maintenance Manual 10 Solder Points on the PCB and BGA Chip Issue 1 0 2012 02 23 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 59 Complete PCB view ...

Страница 65: ...U8655 Maintenance Manual 10 Solder Points on the PCB and BGA Chip Issue 1 0 2012 02 23 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 60 ...

Страница 66: ...U8655 Maintenance Manual 10 Solder Points on the PCB and BGA Chip Issue 1 0 2012 02 23 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 61 ...

Страница 67: ...rd functions If a microSD card is found and is available the test passes Otherwise the test fails If this test passes the next test automatically starts 2 SIM card test SIM card test Automatically test whether the SIM card can be recognized If the SIM card cannot be recognized a message will be displayed indicating that this test fails If this test passes the next test automatically starts 3 Batte...

Страница 68: ...rt the next test 9 Touch screen test Touch screen panel Place your figure on the touchscreen panel and slide your figure along the touchscreen panel edges The areas near the route that your figure passes should turn red Press the Volume key to start the next test 10 Approach test The proximity and illuminance sensor s proximity detection function Place the light shielding plate approximately 4 mm ...

Страница 69: ...st 17 Mobile phone Headset loopback test Headset Insert the headset Touch the Record button Speak to the headset microphone and then touch the Play button If the headset is normal you can hear the voice recording from the headset s earphones Keep the headset inserted Press the Volume key to start the next test 18 FM test FM test The testing software will detect whether a headset is inserted If no ...

Страница 70: ...st Wi Fi test Automatically test the Wi Fi functions During the test the phone will search for nearby hotspots and display the MAC addresses of the hotspots that have been found Note This test requires an active hotspot in the testing environment Press the Volume key to start the next test 24 Display test Displaying test results Display the MMI test results Failed test items will be listed 11 2 Vo...

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