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Huawei U8800 Maintenance Manual
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Huawei U8800 Maintenance Manual

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U8800 Maintenance Manual Basic Version
Prepared by
Reviewed by
Approved by
V1.1
Product Department
Documentation Team
Huawei Technologies Co., Ltd.
All rights reserved
Date
2011-3-21
Date
Date

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Summary of Contents for Huawei U8800

  • Page 1 U8800 Maintenance Manual Basic Version V1.1 Product Department Prepared by Date 2011-3-21 Documentation Team Reviewed by Date Approved by Date Huawei Technologies Co., Ltd. All rights reserved...
  • Page 2 U8800 Maintenance Manual Basic Version V1.1 Internal Revision record Date Revision Revision Section Change Author Version Number Description Cause 2010-11-24 V1.0 Product Department Documentation Team 2011-3-21 V1.1 Product Department Documentation Team Huawei confidential. No spreading without permission. Page 2 of 61...

  • Page 3: Table Of Contents

    U8800 Maintenance Manual Basic Version V1.1 Internal Contents PRODUCT INTRODUCTION ............................5 .............................5 RODUCT PPEARANCE ............................5 RODUCT PECIFICATIONS MAINTENANCE INSTRUCTIONS ..........................7 ............................7 OCUMENT PPLICATION ..........................7 AINTENANCE RECAUTIONS ......................7 AINTENANCE NFORMATION IRECTION EXPLOSIVE VIEW OF THE WHOLE UNIT ......................8 LOCATION OF COMPONENTS ON THE MAIN BOARD ................10...
  • Page 4 U8800 Maintenance Manual Basic Version V1.1 Internal 9.17.2 RF Transmitting Failure-WCDMA2100MHz ......................58 9.17.3 RF Transmitting Failure-GSM .............................59 10 FUNCTIONAL TEST ..............................60 10.1 MMI T ..................................60 10.2 ..............................61 OICE Huawei confidential. No spreading without permission. Page 4 of 61 2011-03-21...

  • Page 5: Product Introduction

    U8800 Maintenance Manual Basic Version V1.1 Internal Product Introduction 1.1 Product Appearance 1.2 Product Specifications Item Specification Dimensions （ L×W×H） 120mm(L)×62mm(W)×11.6mm(T) Weight < 130g (including the battery) Power Supply 100-240V, 50/60Hz Shape Bar-type Antenna Built-in antenna WCDMA/HSDPA: 3GPP FDD Release 99, Release 5 (International...
  • Page 6 U8800 Maintenance Manual Basic Version V1.1 Internal Item Specification GSM/GPRS 850MHz: 824MHz~849MHz/869MHz~894 MHz(Uplink /Downlink) GSM/GPRS 900MHz：880~915MHz/ 925~960MHz (Uplink/Downlink) DCS/GPRS 1800MHz：1710~1785MHz/ 1805~1880MHz (Uplink/Downlink) PCS/GPRS 1900MHZ: 1850~1910MHz/ 1930~1990MHz (Uplink/Downlink) Type: Li-ion battery Capacity: 3.7V, 1500mAh Battery Talk time: up to 500 minutes(2G), up to 400 minutes(3G) Standby time: up to 380 hours(2G), up to 440 hours(3G) Headset interface: 3.5mm...

  • Page 7: Maintenance Instructions

    This document provides instructions for the maintenance of Huawei products for the maintenance personnel in Huawei-authorized service sites. This manual is Huawei proprietary and is only permitted to be used by authorized service sites or companies. Mistakes may be found in the document. If you have found any mistake or have any suggestion, please contact our customer service personnel.

  • Page 8: Explosive View Of The Whole Unit

    U8800 Maintenance Manual Basic Version V1.1 Internal Explosive View of the Whole Unit 13 15 8 10 This exploded view is only applied to show phone frame. It is not regarded as a reference for applying spare parts. Description Quantity...
  • Page 9 U8800 Maintenance Manual Basic Version V1.1 Internal Description Quantity Back_cover_ASM Coaxial cable Screws_1 Camera _cover Test_Hole_Rubber Screws_2 TF_Sheet Power_key Product label_ Plastic_frame Side_volum_key Battery Deco_Cover_Asm BATTERY_COVER_ASM Product label Huawei confidential. No spreading without permission. Page 9 of 61 2011-03-21...

  • Page 10: Location Of Components On The Main Board

    U8800 Maintenance Manual Basic Version V1.1 Internal Location of Components on the Main Board U3201 RF Switch J1102 IO Connector MIC1 X401Crystal-19.2MHz GSM&WCDMA Failure symptom: Failure symptom: Failure symptom: Failure symptom: Charge failure, Transmitting voice No power on, RF transmitter failure,...
  • Page 11 RF receiver failure GPS function failure No power on, RF failure, Charge failure Others failure etc BOM List is only for your reference, the lasted BOM information is downloaded in the system of Huawei. Description Location 15010251 Schottky Diode-30V D1201,D1202...
  • Page 12 U8800 Maintenance Manual Basic Version V1.1 Internal Description Location 15040208 Transient Suppressing Diodes-6.8V D1601 19040121 Fast Blowout Fuse-32V F1101 14240222 IO Connector,Micro_B Type Female,5pins J1102 14240181 BTB Connector-Fmale-24Pin J1201,J1603 14240067 BTB Connector-BTB-Female-70 J1301 14240199 BTB Connector,Female,10Pin J1401 14240116 Battery Connector-3pin...
  • Page 13 U8800 Maintenance Manual Basic Version V1.1 Internal Description Location 51621274 Main Antenna SMT Spring J3201,J3202,J3203,J410 1,J4102 47100302 Power Module, U3501 824-849MHz,880-915MHz,1710-1785MHz,1850-1910MHz 47990027 RF Impedance Converter,BT Balun,2400~2500MHz U3702 13010264 SAW Filter,1590.16MHz Z4101 13010265 SAW Filter,1574.42~1605.89MHz Z4102 14240163 Connector,SIM Socket-6PIN J1601 15010251...

  • Page 14: Software Upgrade

    U8800 Maintenance Manual Basic Version V1.1 Internal Software Upgrade 5.1 Upgrade Preparation Item Contents Remark Battery The battery level must be more than two bars. Micro SD card More than 512M Upgrade Environment For copying upgrade file U8800V100R001C00B This version is only for your reference information. Please File list download the latest version.

  • Page 15: Force Upgrade Process

    U8800 Maintenance Manual Basic Version V1.1 Internal When the progress bar stop, the phone will restart, if not you need to remove the battery manually. 5.3 Force Upgrade Process 1. Format micro SD card , and delete its contents. 2. Create a folder and named as “dload”, copy “UPDATA.APP” into it.
  • Page 16 U8800 Maintenance Manual Basic Version V1.1 Internal 6. After upgrade is completed, handset will restart automatically. Huawei confidential. No spreading without permission. Page 16 of 61 2011-03-21...

  • Page 17: Check Firmware Version

    U8800 Maintenance Manual Basic Version V1.1 Internal 5.4 Check Firmware Version Select Setting ->About phone-> Build number. 5.5 Error handling Error 1 During SD card upgrade, if handset shows flash screen to lead failed upgrade, check whether there is a miss-operation.

  • Page 18: Maintenance Tools

    U8800 Maintenance Manual Basic Version V1.1 Internal Maintenance Tools Name: Constant-temperature Hot Air Gun Purpose: Heat component. Name: Soldering Iron Purpose : Repair soldering Name: DC Power Supply Purpose: Supply voltage and current. Name: Soldering Station Purpose: Fix main board.
  • Page 19 U8800 Maintenance Manual Basic Version V1.1 Internal Name: Tool kit Purpose : Assemble and Disassemble tool Name: Electronic Screw Driver Purpose : Assemble and Disassemble tool Huawei confidential. No spreading without permission. Page 19 of 61 2011-03-21...

  • Page 20: Disassembly Process

    U8800 Maintenance Manual Basic Version V1.1 Internal Disassembly Process 2. Disassemble procedure of the U8800 is shown 1. Make sure the ESD antistatic wrist strap connect to below. the ground is normal. 3. Remove the battery cover. 4. Remove the battery.
  • Page 21 U8800 Maintenance Manual Basic Version V1.1 Internal 6. Remove the six screws. 5. Remove the decoration cover. 7. Remove FPC of the power key from the back cover. 8. Disassemble the buckles of back cover. 9. Disassemble another buckles of back cover.
  • Page 22 U8800 Maintenance Manual Basic Version V1.1 Internal 12. Remove FPC of the power key from the front 11. Remove the back cover and note BTB connection on the board. cover. 14. Remove BTB connector of the mainboard. 13. Disassemble the coaxial cable connector.
  • Page 23 U8800 Maintenance Manual Basic Version V1.1 Internal 18. Remove BTB connector of the TF card. 17. Remove the mainboard. 20. Put up the TF card FPC. 19. Heat the TF card FPC by the Hot Air Gun for 15 seconds. setting temperature: 150℃.
  • Page 24 U8800 Maintenance Manual Basic Version V1.1 Internal 24. Paste the protection film to the touch panel 23. Paste the protection film to the LCD. 26. Remove the power key FPC. 25. Put up the buckle of the power key FPC .
  • Page 25 U8800 Maintenance Manual Basic Version V1.1 Internal 30. Remove the receiver. 29. Remove the sub_PCB from the LCD module. 32. Disassembly procedure of the U8800 is completed 31. Remove the speaker. Huawei confidential. No spreading without permission. Page 25 of 61...

  • Page 26: Assembly Process

    U8800 Maintenance Manual Basic Version V1.1 Internal Assembly Process 1. Make sure the ESD antistatic wrist strap connect to 2. Assembly procedure of the U8800 is shown below. the ground is normal. 3. Install the speaker. 4. Install the receiver.
  • Page 27 U8800 Maintenance Manual Basic Version V1.1 Internal 5. Install the sub_PCB to the LCD module. 6. Install the power key FPC. 7. Install the buckle of the power key FPC 8. Rip off the protective film of LCD. 10. Assemble the LCD module to the front cover.
  • Page 28 U8800 Maintenance Manual Basic Version V1.1 Internal 11. Install the power & volume key FPC. 12. Install the TF card FPC. 13. Install connector of the TF card FPC. 14. Install the mainboard and note the coaxial cable. 15. Install the coaxial cable.
  • Page 29 U8800 Maintenance Manual Basic Version V1.1 Internal 17. Install BTB connector of the LCD. 18. Install BTB connector of the touch panel. 19. Fix the power key FPC to the front cover. 20. Install the volume key to the front cover.
  • Page 30 U8800 Maintenance Manual Basic Version V1.1 Internal 23. Assemble the other buckles of the back cover. 24. Fix the power key FPC to the back cover. 25. Paste the TF card sheet. 26. Install the two screws. 27. Install the decoration cover.
  • Page 31 U8800 Maintenance Manual Basic Version V1.1 Internal 29. Install the battery. 30. Install the battery cover. 31. Assembly procedure of the U8800 is completed. Huawei confidential. No spreading without permission. Page 31 of 61 2011-03-21...

  • Page 32: Troubleshooting Of Common Failures

    9.1 Principle Instruction The U8800 develops basing on MSM7230 IC of Qualcomm. Phone mostly consists of base band module, RF module and PM module. The MSM7230 IC of base band is divided into RF signal disposal and intelligent interface connection.

  • Page 33: No Power On

    U8800 Maintenance Manual Basic Version V1.1 Internal 9.2 No Power on 9.2.1 No Power on---High current Analysis： The current is above 500mA as power supply by DC-power. Short circuit of VBAT signal or VPH_PWR signal causes high current usually. Reference Figure 9-1 High current Check J1501&...

  • Page 34: No Power On--Small Current

    U8800 Maintenance Manual Basic Version V1.1 Internal U1001 CHG_CHIP J1102 Pin1-test J1102 5.0V VPH_PWR-test LB1101 U1001 3.7V L1001 VBAT-test 3.7- U3501 C3501 4.2V VPH_PWR-test U301 3.7V C409 U301 VBAT-test 3.7- U3302 C3302 4.2V U3501 U3402 U3302 3.7- VCC-test 3.7- J1501 Pin3-VBAT 4.2V...
  • Page 35 U8800 Maintenance Manual Basic Version V1.1 Internal VREG_MSMA-test U301 2.85V C402 X401 Pin1 19.2MHz VREG_MSME-test X401 U301 2.6V C433 VREG_WLAN-test U301 3.0V U301 C434 U1701 VREG_MSMP-test VREG_S2(RFRX)- U301 1.3V U301 1.3V C430 test L403 VREG_S4(RFTX)- U301 2.2V test L405 Figure9-2 Huawei confidential.

  • Page 36: Charge Failure

    U8800 Maintenance Manual Basic Version V1.1 Internal 9.3 Charge Failure Reference Figure 9-1 Huawei confidential. No spreading without permission. Page 36 of 61 2011-03-21...

  • Page 37: Light Sensor Failure

    U8800 Maintenance Manual Basic Version V1.1 Internal 9.4 light Sensor Failure Reference Figure 9-3 U601 VREG_L10 2.7V D601& Infrared Emitting D603 Diode Figure9-3 Huawei confidential. No spreading without permission. Page 37 of 61 2011-03-21...

  • Page 38: Sim Card Failure

    U8800 Maintenance Manual Basic Version V1.1 Internal 9.5 SIM Card Failure Reference Figure 9-4 Measure J1601 resistance value U201 D1601 ESD Protected / Figure9-4 Huawei confidential. No spreading without permission. Page 38 of 61 2011-03-21...

  • Page 39: Tf Card Failure

    U8800 Maintenance Manual Basic Version V1.1 Internal 9.6 TF Card Failure TF card failure Check whether FPC of the Replace the FPC TF_card is normal? Measure whether the supply Replace the U301 voltage of the TF_card is normal? Replace the U201 9.7 Display Failure...
  • Page 40 U8800 Maintenance Manual Basic Version V1.1 Internal U1201 module &D1201 match circuit J1201 connector TP BTB J1401 connector Figure9-5 Huawei confidential. No spreading without permission. Page 40 of 61 2011-03-21...

  • Page 41: Touch Panel Failure

    U8800 Maintenance Manual Basic Version V1.1 Internal 9.8 Touch Panel Failure Reference Figure 9-5 9.9 Audio Failure 9.9.1 No Ring Tone Reference Figure 9-6 Huawei confidential. No spreading without permission. Page 41 of 61 2011-03-21...
  • Page 42 U8800 Maintenance Manual Basic Version V1.1 Internal No ring tone Measure whether resistance Replace the speaker value of the speaker is 8Ω? Replace the U301 on Measure whether the U301 on the sub_PCB the sub-PCB is normal? Check whether the sub-PCB is...
  • Page 43 U8800 Maintenance Manual Basic Version V1.1 Internal SP301 SPK_OUT_P MIC2 MIC 1.2KΩ SP301 SPK_OUT_N U301 Audio PA VPH_PWE-test U301 3.7V LB301 U3701 RF Chip U201 Figure9-6 Huawei confidential. No spreading without permission. Page 43 of 61 2011-03-21...

  • Page 44: Voice Transmitting Failure

    U8800 Maintenance Manual Basic Version V1.1 Internal 9.9.2 Voice Transmitting Failure Reference Figure 9-6 9.9.3 Receiver Failure Huawei confidential. No spreading without permission. Page 44 of 61 2011-03-21...

  • Page 45: Earphone&Tv Out Failure

    U8800 Maintenance Manual Basic Version V1.1 Internal 9.10 Earphone&TV OUT Failure Reference Figure 9-7 Earphone failure Check whether J801 is normal? Replace the J801 Measure whether the D801 is Replace the D801 normal? Measure whether the Z801 is Replace the Z801...

  • Page 46: Camera Failure

    U8800 Maintenance Manual Basic Version V1.1 Internal Camera Camera modue / J801 VPH_PWE-test U801 3.7V C814 Z801 AudioVaristor D801 ESD Protected / TVOUT-Analog U801 Switch Figure9-7 9.11 Camera Failure Reference Figure 9-7 Huawei confidential. No spreading without permission. Page 46 of 61...

  • Page 47: Vibration Failure

    U8800 Maintenance Manual Basic Version V1.1 Internal 9.12 Vibration Failure WIFI J4201 Connector VREG_S3- U4201 1.8V Test C4225 VREG_WLAN- U4201 3.0V Test C4222 X4201 Test pin1 signal 40MHz U4201 X4201 U3701 U201 Figure9-8 Huawei confidential. No spreading without permission. Page 47 of 61...

  • Page 48: Wifi &Bt Failure

    U8800 Maintenance Manual Basic Version V1.1 Internal 9.13 WIFI &BT Failure Reference Figure 9-8 WIFI&BT failure Check whether the WIFI coaxial Replace the coaxial cable is normal? cable Measure whether the J4201 is Replace the J4201 normal? Measure whther output signal of...

  • Page 49: Gps Failure

    U8800 Maintenance Manual Basic Version V1.1 Internal 9.14 GPS Failure Reference Figure 9-9 GPS failure Check whether the GPS Replace the antenna antenna is normal? Replace Z4101&Z4102, check whether it is normal? Replace U4101, check whether it is normal? Measure U3701 whether it is...

  • Page 50: Accelerometer & Electronic Compass Failure

    U8800 Maintenance Manual Basic Version V1.1 Internal 9.15 Accelerometer & Electronic Compass Failure Reference Figure 9-9 A&C failure Check J1401 whether it is Replace the J1401 normal? Measure U1401 whether it is Replace the U1401 normal? Replace the U201 Huawei confidential. No spreading without permission.

  • Page 51: Rf Receiving Failure

    U8800 Maintenance Manual Basic Version V1.1 Internal 9.16 RF Receiving Failure 9.16.1 RF Receiving Failure-WCDMA900MHz Analysis：Above all, check RF parameter whether is correct, the wrong RF parameter can cause the failure usually. Reference Figure 9-10 Signal Failure (W900MHz) Measure VREG_RF...
  • Page 52 U8800 Maintenance Manual Basic Version V1.1 Internal Switch- U3202 check output Duplex U3304 filter-W2100 Duplex U3404 filter-W900 U301 VREG_S4-test U3701 2.2V C4003 VREG_S2(RFRX)- U3701 U3701 1.3V test C3926 Unbuffer Single U3603 Inverter -G1900 U201 Switch U3602 -GSM1900&1800 Switch U3602 -GSM1900&1800...

  • Page 53: Rf Receiving Failure-Wcdma2100Mhz

    U8800 Maintenance Manual Basic Version V1.1 Internal 9.16.2 RF Receiving Failure-WCDMA2100MHz Analysis：Above all, check RF parameter whether is correct, the wrong RF parameter can cause the failure usually. Reference Figure 9-10 Signal Failure (W2100MHz) Measure VREG_RF whether voltage is Replace the U301 normal？...

  • Page 54: Rf Receiving Failure-Gsm850&900

    U8800 Maintenance Manual Basic Version V1.1 Internal 9.16.3 RF Receiving Failure-GSM850&900 Reference Figure 9-10 Signal Failure (GSM850&900) Measure VREG_RF whether voltage is Replace the U301 normal？ Measure whether two pins of the U3201 are Replace the U3201 connection？ Replace U3202, check BT/CT whether it is normal？...
  • Page 55 U8800 Maintenance Manual Basic Version V1.1 Internal Signal Failure (GSM1800&1900) Measure VREG_RF whether voltage is Replace the U301 normal？ Measure whether two pins of the U3201 are Replace the U3201 connection？ Replace U3202, check BT/CT whether it is normal？ Check U3601&U3602&U3603,...

  • Page 56: Rf Transmitting Failure

    U8800 Maintenance Manual Basic Version V1.1 Internal 9.17 RF Transmitting Failure 9.17.1 RF Transmitting Failure-WCDMA900MHz Reference Figure 9-10& Figure 9-11 Signal Failure (W900MHz) Measure VREG_RF whether voltage is Replace the U301 normal？ Replace U3202, check whether it is normal？ CT/MT Replace U3404, check whether it is normal？...
  • Page 57 U8800 Maintenance Manual Basic Version V1.1 Internal VBAT-test 3.7- U3302 C3302 4.2V U301 VBAT-test 3.7- U3401 C3406 4.2V U3501 U3402 U3302 Z3401 TX filter-W900 / VBAT-test 3.7- U3501 C3501 4.2V U3301 filter-W2100 Figure9-11 Huawei confidential. No spreading without permission. Page 57 of 61...

  • Page 58: Rf Transmitting Failure-Wcdma2100Mhz

    U8800 Maintenance Manual Basic Version V1.1 Internal 9.17.2 RF Transmitting Failure-WCDMA2100MHz Reference Figure 9-10& Figure 9-11 Signal Failure (W2100MHz) Measure VREG_RF whether voltage is Replace the U301 normal？ Replace U3202, check CT/MT whether it is normal？ Replace U3304, check whether it is normal？...

  • Page 59: Rf Transmitting Failure-Gsm

    U8800 Maintenance Manual Basic Version V1.1 Internal 9.17.3 RF Transmitting Failure-GSM Reference Figure 9-10& Figure 9-11 Signal Failure (GSM) Measure VREG_RF whether voltage is Replace the U301 normal？ Replace U3202, check CT/MT whether it is normal？ Measure U3501 whether it is Replace the U3501 normal？...

  • Page 60: Functional Test

    U8800 Maintenance Manual Basic Version V1.1 Internal Functional Test 10.1 MMI Test Input “*#*#2846579#*#*”，select “MMI Test_Ⅱ”. Item Step Content Test method and information Test Micro-SD, if there is Micro-SD insert in, the screen SD card test SD card test will show “SD card exist”, or it will show “no SD card”, press “Volume -”...

  • Page 61: Voice Call Test

    U8800 Maintenance Manual Basic Version V1.1 Internal Item Step Content Test method and information Speak to MIC, and you will hear sound loop from receiver, Call loop test Call loop test press “Volume -” key to continue. Press the line controlling headset button, and n its color...

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