Huawei U8666 Maintenance Manual
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Huawei U8666 Maintenance Manual

Huawei U8666 Maintenance Manual

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U8666
Maintenance Manual
Issue
1.0
Date
2012-05-14
HUAWEI TECHNOLOGIES CO., LTD.

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Summary of Contents for Huawei U8666

  • Page 1 U8666 Maintenance Manual Issue Date 2012-05-14 HUAWEI TECHNOLOGIES CO., LTD.
  • Page 2 Notice The purchased products, services and features are stipulated by the contract made between Huawei and the 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"...

  • Page 3: About This Document

    Maintenance support team 2012-05-14 Approved by Date Service representative 2012-05-14 Change History Date Version Change Reason Revised Section Description Author 2012-05-14 V1.0 Released the first issue. R&D Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 4: Table Of Contents

    9.3.1 RF Failure ............................. 31 9.3.2 GPS ............................... 34 9.3.3 Wi-Fi/Bluetooth/FM Module ........................ 34 9.4 Peripheral Circuits ............................35 9.4.1 Display ..............................35 9.4.2 Camera ..............................38 Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 5 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 .............................. 65 Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 6: Product Introduction

    Maintenance Manual 1 Product Introduction 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) Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 7 TFT LCD Color 262K Size 3.5 inches Connectors Charging port micro-USB connector USB port micro-USB connector microSD card microSD card interface interface Headset jack 3.5 mm (LRGM) Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 8 ≤ 104 dBm Static sensitivity Operating temperature: –10° C to +55° C Temperature Storage temperature: –40° C to +70° C Humidity Operating humidity: 5% to 95% RH Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 9: Applicable Scope And Precautions

    2.1 Applicable Scope This document provides repair instructions for technicians at service centers authorized by Huawei. This maintenance manual is confidential and accessible to authorized service centers (ASCs) and authorized service providers (ASPs) only. While every effort has been made to ensure the accuracy of this document, errors may still exist.

  • Page 10: 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 Item Quantity U8666_TP protective film U8666_TP Lens Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 11 U8666_Front foam of speaker U8666_PA shielding cover U8666_Volume key FPC U8666_Power key FPC U8666_LCD conductive fabric U8666_Front MIC pouches U8666_RTR shielding cover U8666_Conductive film U8666_ Conductive film block Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 12: Components On The Pcba

    RF failure U3302 power module, PA Failure of this component can U3304 duplexer cause: Failure of this component can W2100MHz transmission cause: failure W2100MHz transmission and reception failure Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 13 Charging failure chip Failure of this component can cause: RF failure J901 IO connector Failure of this component can cause: Charging failure, data communication failure Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 14: Software Upgrade

    Before the upgrade, NV items backup is performed (if the phone's NV items has not been backed up before). Then the phone restarts and the upgrade starts. The upgrade progress is displayed on the LCD. Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 15 The phone enters the SD forcible upgrade. This method is recommended. If the forcible upgrade still fails, use another microSD card and try forcible upgrade again. Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 16: Maintenance Tools

    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 Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 17 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 Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 18: 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 3. Remove the battery. upper part of. Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 19 6. Remove the six screws from the shell. 7. Disassemble paddles inserted from the bottom left corner after the bayonet apart Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 20 11 . Release the volume key FPC. 12. Disconnect the BTB connector cable between the 13. Release the two latches in the PCBA. touchscreen panel and the LCD. Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 21 16. Release the BTB connector, and remove the 17. Release the LCD latches, and remove the LCD. camera. Release the ZIF connector, and remove the volume key FPC. Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 22 18. Apply a protective film on the LCD. touch screen panel. 20. Remove the Power key FPC. 21. Remove the receiver. 23. The phone is now disassembled. 22. Remove the speaker. Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 23: Assembly Procedure

    2. Install the camera on the PCBA, and snap the BTB 3. Install the receiver. connector in place. Install the volume key FPC into the ZIF connector, and attach the adhesive film. Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 24 9. Gently press the PCBA to close the latches to secure 8. Assembled motherboard. The motherboard in the PCBA. accordance with the bottom of the positioning hole is loaded. Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 25 13. Install cover B: Firstly install from bottom side 12. Install the speaker. then press top side. 14. Install the six screws into cover B. 15. Install SIM card bracket. Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 26 8 Assembly Procedure 16. Install the antenna cover, the pressure mount 17. Install battery. location makes installation smooth. 18. Install the battery cover. 19. The phone is now assembled. Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 27: Principles And Failure Analysis

    Principles and Failure Analysis 9.1 Block Diagram The MSM7X2XA (the 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.

  • Page 28: Function Description Of The Pcba

    Performs the RF function of WCDMA signal subsystem GSM/DCS circuit, AGC circuit reception and transmission. signal Mainly includes the RTR6285A RF chip and the transmission and peripheral circuit. reception Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 29 Color LCD and LCD driver, interface The phone's LCD with 256K colors. The brightness backlight mode, and backlight of the LCD backlight can be adjusted by users. control Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 30 CE and CCC certified. The charger's output current must be able to charge the battery and supply power to the phone for normal operation at the same time. Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 31: Baseband Unit

    Supports USB 2.0; does not support USB OTG. 9.2 Baseband Unit 9.2.1 Power-on Management Circuits On the U8666, most power supplies are provided by the power management chip PM8029. Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 32 The power-on failure may be caused by any of the following conditions:  No current Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 33 U201 1.1V Test L201 VREG_L3 U201 1.2V Test C203 VREG_L4 U201 1.1V Test C204 VREG_L9 U201 1.8V Test C221 U201 X301 32.768KHz Test Pin2 X301 Figure 9-1 Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 34 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 usually the result of short-circuited VBAT circuit. Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 35: Charging Management Circuits

    Re-solder or Is J902 normal? replace J902. Replace Q202. Is Q202 normal? Remove U201. Do short Replace U201. circuits still exist? Replace U401. 9.2.2 Charging Management Circuits Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 36: Rf Unit

    9.3.1 RF Failure Troubleshooting Transmission Failure  GSM/DCS transmission failure Before starting the following process, make sure that the USIM card and the antenna are well connected. Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 37 H: voltage higher than 1.3 V. L: voltage lower than 0.5 V.  WCDMA transmission failure (use W2100 as an example) Before starting the following process, make sure that the USIM card and the antenna are well connected. Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 38 Check U3801 output? Check U401 NOTE  The following tables describe the working status of the WCDMA power amplifier. PA_ON PA_R PA_R1 MODE HI Power MI Power Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 39: Gps

    9.3.3 Wi-Fi/Bluetooth/FM Module The U8666 uses a Wi-Fi/Bluetooth/FM 3-in-1 module (Broadcom's BCM4330). The Bluetooth and Wi-Fi 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.

  • Page 40: Peripheral Circuits

    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, supporting a 60 Hz refresh rate, and requiring only one pair of differential clock signals and one pair of differential signals. The LCD also supports frame synchronization, using the MDP_VSYNC signals (GPIO_097) as data transmission synchronization signals to avoid screen tearing.
  • Page 41 GPIO10 (PM8029) U8666's LCD backlight control: The U8666 uses a 3.5-inch LCD whose backlight is provided by six LEDs connected in series. The backlight LEDs are controlled by the backlight driver chip TPS61160A. The ground resistance of the driver chip pin FB is set to 10 Ω, providing up to 20 mA current to the LEDs (duty:100%).
  • Page 42 LED_K The cathode of the backlight backlight LED Brightness control PWM_OUT Reserved signals from the LCD Brightness control LCD_BL_PWM GPIO1 (PM8029) signals from the phone's main chip Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 43: Camera

    Return the phone to the factory 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 transmitted in MIPI mode. Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright ©...
  • Page 44 MIPI_CSI2_LANE0_N Data communication signal NOTE The camera interface circuit is designed for compatibility with multiple types of cameras. The U8666 uses a 3.2-megapixel full-frame camera, so the CAM_VCM_PD_N and VREG_CAM_2P85 lines are not used. Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential...

  • Page 45: Usb

    Is J1001 poorly soldered or Re-solder or replace are its contacts defective? J1001 Replace the camera. Is the problem solved? Return the phone to the factory 9.4.3 USB Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 46: Headset Jack

    The HSED_MICBIAS (PM8029/HSED_BIAS1) supplies power to the headset microphone. The HSED_HSKEY_ADC (PM8029 MPP5) is used to detect the headset button press. NOTE The U8666 supports only LRGM headsets, and does not support LRMG headsets. Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential...
  • Page 47 Is a headset icon Replace the displayed on the headset jack screen? Return the phone to the f actory  The headset button cannot be used to answer a call Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 48: Keys

    Return the phone to the factory 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.

  • Page 49: Status Indicator And Touch Key Backlight Circuits

    Return the phone to the factory 9.4.6 Status Indicator and Touch Key Backlight 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 Driver Pin (PM8029)

  • Page 50: Battery Connector

    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 Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 51: Accelerometer Circuit

    9.4.8 Accelerometer Component Network MSM7225A Pin Description I2C1_SCL GPIO_131 I2C bus I2C1_SDA GPIO_132 Accelerometer interrupt INT1 MEMS_INT1 GPIO_28 signal INT2 MEMS_INT2 GPIO_111 Accelerometer interrupt signal (sleep) 9.4.9 Compass Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 52: Proximity And Illuminance Sensor

    I2C bus 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 I2C1_SCL GPIO_131 I2C bus...

  • Page 53: Vibration Motor

    Is U1207 poorly soldered Re-solder, clean or dirty? or replace U1207 Return the phone to the f actory 9.4.11 Vibration Motor The motor driver current is controlled by PM VIB_DRV_N. Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 54: Receiver

    Return the phone to the f actory 9.4.12 Receiver The receiver receives differential earphone output from the MSM chip. The following figure shows the circuit. Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 55 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. Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright ©...
  • Page 56 Does the phone mistakenly Replace the detect the insertion of a headset connector headset? Replace the receiver. Is the problem solved? Return the phone to the f actory Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 57: Microphone

    U8655 Maintenance Manual 9 Principles and Failure Analysis 9.4.13 Microphone Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 58: Touchscreen Panel

    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 light from the LEDs to the touch key area.

  • Page 59: Sim Card

    NOTE Considering that SIM card operations are frequent, transient-voltage-suppression (TVS) diodes are added to the circuit to provide ESD and surge protection. USIM card circuit Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 60: Microsd Card

    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. Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 61 U8655 Maintenance Manual 9 Principles and Failure Analysis Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 62: Solder Points On The Pcb And Bga Chip

    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 Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 63 U8655 Maintenance Manual 10 Solder Points on the PCB and BGA Chip Wi-Fi/Bluetooth/FM section RTR8285A section Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 64 U8655 Maintenance Manual 10 Solder Points on the PCB and BGA Chip Complete PCB view: Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 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.
  • Page 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.

  • Page 67: Functional Tests

    Volume– key to start the next test. LCD test White screen The LCD displays a white screen. Press the Volume– key to start the next test. Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 68 Automatically test the speaker. (Do not insert the Speaker test Speaker test headset.) If the speaker emits sound during the test, it is normal. Press the Volume– key to start the next test. Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
  • Page 69 MAC addresses of the Bluetooth devices that have been found. (Note: This test requires another device with Bluetooth enabled.) Press the Volume– key to start the next test. Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

  • Page 70: Voice Call Test

    If no problems are found during the test, finish the voice call test. If any problems are found, troubleshoot the phone or send it to an advanced service site for repair. Issue 1.0 (2012-02-23) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

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