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U9500 Maintenance Guide

9 Troubleshooting

Issue 1.2 (2012-6-30)

Huawei Proprietary and Confidential

9.2.23 WCDMA RF Reception Failure

Cause

Figure 9-64 and Figure 9-65 show the components, damage on which can cause the WCDMA
RF reception failure.

Figure 9-64

Components that might be damaged

U2801 Audience

U3801 Modem

U3501 RF switch

Summary of Contents for U9500

Page 1: ...U9500 Maintenance Guide Issue 1 2 Date 2012 06 30 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: ...epared by Shu Yingfei employee ID 00186163 Date 2012 04 27 Reviewed by Date Approved by Date Change History Date Version Change Reason Changed Chapter Change Description Author 2012 04 27 V1 0 Shu Yingfei 2012 05 02 V1 1 Added feedback about the first release Shu Yingfei 2012 06 30 V1 2 Modified chapters 4 7 and 9 according to the service department opinions Feng Yifan ...

Page 4: ...ew 5 3 1 Exploded View 5 3 2 Component List 5 4 Layout of Components on the PCBA 7 4 1 Components on the PCBA 7 5 Software Upgrade 10 5 1 Upgrade Preparation 10 5 2 Upgrade Using a microSD Card 10 5 2 1 Normal Upgrade 10 5 2 2 Forcible Upgrade 11 5 3 Upgrade Failure Troubleshooting 11 6 Repair Tools 12 7 Disassembly Procedure 14 7 1 Disassembly Preparation 14 7 2 Disassembly Procedure 14 8 Assembl...

Page 5: ...56 9 2 10 TP Failure 58 9 2 11 Light Sensor Failure 60 9 2 12 Acceleration Sensor Failure 62 9 2 13 Compass Failure 63 9 2 14 Gyroscope Failure 64 9 2 15 Camera Failure 65 9 2 16 Phone Audio Failure 67 9 2 17 Headset Audio Failure 69 9 2 18 Speaker Noice 71 9 2 19 Wi Fi Bluetooth Failure 73 9 2 20 FM Failure 76 9 2 21 GPS Failure 78 9 2 22 HDMI Failure 81 9 2 23 WCDMA RF Reception Failure 84 9 2 2...

Page 6: ...uct Overview Issue 1 2 2012 6 30 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 1 1 Product Overview 1 1 Appearance Figure 1 1 shows U9500 Figure 1 1 U9500 1 2 Features Table 1 1 lists the product features ...

Page 7: ...0 Memory 8 GB ROM 1 GB RAM Interface Micro USB for charging and data connection 3 5 mm headset jack and MHL interface Battery 1800 mAh Li ion battery Display Size 4 5 inches Type TFT Resolution 1280 x 720 pixels HD microSD card Supports a maximum of 32 GB microSD card Antenna Built in antenna Camera Rear camera 8 megapixels with dual LED flashlight Front camera 1 3 megapixels Bluetooth Bluetooth 3...

Page 8: ...ential Copyright Huawei Technologies Co Ltd 3 Item Description Dual microphone noise reduction Gravity sensitive proximity sensitive light sensitive and gyroscope Bluetooth 3 0 FM and GPS AGPS GLONASS High speed WCDMA 3G WLAN access Huawei s android app store Hi space Rich services in Hi space ...

Page 9: ...omer service 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 s...

Page 10: ...re structural parts of the phone and cannot be used as reference when requesting spare parts Figure 3 1 shows the U9500 exploded view Figure 3 1 U9500 exploded view Battery cover assembly GPS antenna Bluetooth antenna Back cover assembly Side keys Battery PCBA Speaker Front cover assembly TP assembly TP protector TP protector Speaker Coaxial cable 3 2 Component List Table 3 1 lists the components ...

Page 11: ...ated 1 02230MAN U9500 Black A_Cover LCD TouchLens 1 02230MAP U9500 White A_Cover LCD TouchLens 1 23060074 Camera Module Group CMOS 1 3M FF Front HD BTB 1 23060093 Camera Module Group 1 3 2 CMOS BSI 8M 3264 2448 Terminal Dedicated 1 27160960 Terminal Antenna 824MHz 960MHz 1710MHz 2170MHz Better Than 3dBi Better Than 3dBi Isotropic line polarization better than 3 4W U9500 1 Main Antenna Fpc SAA 1 27...

Page 12: ...ei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 7 4 Layout of Components on the PCBA 4 1 Components on the PCBA Figure 4 1 and Figure 4 2 show the components on the top and bottom sides of the PCBA and failures that might occur because of damages to the components ...

Page 13: ...e U3801 Modem Failure symptom network registration failure network access failure and call set up failure TCX03601 GPS clock Failure symptom GPS failure U501 Clock buffering chip Failure symptom power on failure codec failure or BT WL FM failure U1102 8G EMMC Failure symptom power on failure data storage or read failure U3103 Lev el shifter chip Failure symptom MHL failure U3106 Inv erter Failure ...

Page 14: ...tom camera failure MIC1402 Secondary microphone Failure symptom no loopback on the secondary microphone U4703 RF switch Failure symptom network connection failure U4701 Dual mode RF transceiver chip Failure symptom network access failure U4708 RFclock 26 MHz Failure symptom network access failure U3206 Load switch Failure symptom camera failure U1201 Codec chip Failure symptom audio failure U401 D...

Page 15: ...ry Remaining power 20 Upgrade file update app This version is provided for reference only Please download the latest version when upgrading the software Upgrade using the microSD card Normal upgrade Forcible upgrade 5 2 Upgrade Using a microSD Card 5 2 1 Normal Upgrade To perform a normal upgrade perform the following steps Step 1 Create a dload folder in the microSD card s root directory Step 2 C...

Page 16: ...Install the microSD card to the phone Step 4 Press the volume up volume down and Power keys concurrently for more than 3 seconds to power on the phone The phone starts to upgrade The upgrade process is displayed on the screen After the upgrade is complete the phone automatically restarts If the upgrade fails the upgrade page remains on the screen and an upgrade failure message is displayed End 5 3...

Page 17: ... Co Ltd 12 6 Repair Tools Table 6 1 lists the repair tools Table 6 1 Repair tools Picture Description Name heat gun Usage Heats components Name soldering iron Usage solders components Name DC power supply Usage powers the phone Name soldering fixture Usage secures the PCBA Name lead free solder wire Usage soldering material ...

Page 18: ...12 6 30 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 13 Picture Description Name digital multimeter Usage measurement Name toolkit Usage assembling and disassembling Name electric screwdriver Usage fastens and removes screws ...

Page 19: ... Disassembly Preparation Figure 7 1 shows the disassembly tools Figure 7 1 Disassembly tools U9500 Nonmetallic stick Tweezers Phillips screwdriver Hexagon screwdriver 7 2 Disassembly Procedure Wear ESD gloves when you remove the PCBA antenna board FPCs and other electronic components To disassemble a U9500 perform the following operations Step 1 Remove the battery cover ...

Page 20: ...edure Issue 1 2 2012 6 30 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 15 Step 2 Remove the screws in the back over 1 Remove the hexagon screws in the four corners 2 Remove the two Phillips screws in the central part ...

Page 21: ...9500 Maintenance Guide 7 Disassembly Procedure Issue 1 2 2012 6 30 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 16 3 Remove the four Phillips screws on both sides of the phone ...

Page 22: ...ntenance Guide 7 Disassembly Procedure Issue 1 2 2012 6 30 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 17 Step 3 Remove the back cover Step 4 Remove the volume keys and relevant FPCs ...

Page 23: ...U9500 Maintenance Guide 7 Disassembly Procedure Issue 1 2 2012 6 30 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 18 ...

Page 24: ...prietary and Confidential Copyright Huawei Technologies Co Ltd 19 Step 5 Remove the battery The battery is packed using aluminum film and adhesive tapes Exercise caution Do not damage the film or the adhesive tapes The battery cannot be used any more after being disassembled NOTE ...

Page 25: ...U9500 Maintenance Guide 7 Disassembly Procedure Issue 1 2 2012 6 30 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 20 Step 6 Remove the keypad backlight ...

Page 26: ...U9500 Maintenance Guide 7 Disassembly Procedure Issue 1 2 2012 6 30 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 21 Step 7 Remove the primary microphone ...

Page 27: ...U9500 Maintenance Guide 7 Disassembly Procedure Issue 1 2 2012 6 30 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 22 Step 8 Remove the coaxial cable ...

Page 28: ...e Guide 7 Disassembly Procedure Issue 1 2 2012 6 30 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 23 Step 9 Remove the antenna board Remove the antenna board screws and then the antenna board ...

Page 29: ...rocedure Issue 1 2 2012 6 30 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 24 Step 10 Remove the PCBA Release the PCBA from the buckles pull the PCBA downward to remove it and disconnect the receiver BTB connector ...

Page 30: ...y Procedure Issue 1 2 2012 6 30 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 25 Step 11 Remove the receiver support Use the tweezers to separate the Power key FPC from the PCBA and pry the receiver support off ...

Page 31: ...U9500 Maintenance Guide 7 Disassembly Procedure Issue 1 2 2012 6 30 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 26 Step 12 Remove the rear and front cameras ...

Page 32: ...ide 7 Disassembly Procedure Issue 1 2 2012 6 30 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 27 Step 13 Remove the flashlight FPC End Figure 7 2 shows the phone components and disassembly tools ...

Page 33: ...es Co Ltd 28 Figure 7 2 U9500 components and disassembly tools Receiver FPC Rear and front cameras Battery cover assembly Volume key Back cover Battery Front cover assembly Main FPC Screws Coaxial cable Antenna board PCBA Disassembly tools The TP and LCD are glued to the front cover using optical adhesive and cannot be removed NOTE ...

Page 34: ...n finger into the corresponding positioning hole in the back cover assembly and tear the release paper on the golden finger 3 Attach the golden finger to the back cover assembly and melt the positioning pin Melt the positioning pin 4 Install the main antenna 1 Tear away the small release paper and attach the antenna to the back cover through the positioning hole 5 Install the main antenna 2 Tear a...

Page 35: ...e support Pre bend the higher part of the FPC to properly install it to the support 2 Install the sensor light FPC Tear away the release paper and align the positioning hole of the FPC with that of the support 4 Install the ambient light sensor rubber Rrubber support 5 Install the receiver Ensure the spring is pointing upward 6 Fasten the touch panel BTB connector Fasten the power key FPC BTB conn...

Page 36: ...n this part with the positioning pins on the front cover Insert the two LEDs into the positioning slot on the front cover Install the main microphone reinforcing plate to the front cover Slide the main microphone enhancer board into the latches at one end and then press the board to secure it The FPC by the vibrator must be properly attached without tilts Tear away the release paper in the battery...

Page 37: ...d then fasten the BTB connector Fasten the receiver FPC BTB connector Three positioning pins 4 Fasten the LCD FPC BTB connector and then the main FPC BTB connector and install the side keys Tear away the release paper on the LCD FPC and fasten the LCD FPC BTB connector the PCBA Tear away the release paper on the main FPC and fasten the main FPC BTB connector to the PCBA Tear away the release paper...

Page 38: ...to the cable connector place the cable into the positioning slot and connect the cable tail to the cable connector Note Ensure the red end of the coaxial cable is connected to the board as shown in the picture 2 The correctly positioned coaxial cable is shown the figure above Note The coaxial cable must be placed into the slot without tilts Positioning slot The coaxial cable must be placed below t...

Page 39: ...set the torque to 0 9 kgf m To secure the screws marked as 7 8 9 and 10 set the torque to 1 2 kgf m Step 11 Attach the anti dismantle label and install the battery cover 1 Attach the anti dismantle label and back label After you attach the labels use a cotton swab to press the labels to ensure that they are tightly attached Attach the back label with aligning it with the lines in the piture 2 Inst...

Page 40: ...ne is a flagship project of the year 2012 U9500 is a bar type smartphone that supports the combination of application processor AP and cellular modem AP MODEM Based on the TI OMAP4 platform two ARM Cortex A9 1 5 GB cores and two LPDDR2 ports U9500 supports dual channel with enhance performance The phone s hardware architecture is comprised of three parts AP modem and RF unit The OMAP4460 AP is a s...

Page 41: ...nd antenna board HD1U9500A and other module groups such as LCD module group camera module groups vibrator microphone speaker receiver module groups Mechanical parts include the touch lens front cover back cover and battery cover sound cavity main antenna GPS antenna Wi Fi antenna and Bluetooth antenna 0 shows the hardware block diagram of U9500Note U9500 has no NFC or Cap key module Figure 9 2 Har...

Page 42: ...ower supply to the modem BB reset function two line SMPS eight line LDO Modem memory MCP 1 GB 256 MB EMMC eMMC features power consumption and supporting system files Programs and NV items 8 GB 16 GB DDR RAM Memory RAM for program running 1 GB RF WCDMA and GSM DCS transceiver Smartti UE2 WCDMA RF transceiver comprised of an RFMD chip PMU and peripheral circuits GPS GPS receiver Receives and process...

Page 43: ... The volume keys are monitored using the interruption monitoring method through the GPIO When users press the volume key the two top view LED backlights are on Color LCD and backlight LCD driver interface mode and backlight control Size 4 5 inches Category TFT Resolution 1280 x 720 pixels HD microSD card Power supply protective circuit and connector microSD card connector and related interface cir...

Page 44: ... used in China Europe America and Australia The output voltage of the charger is 5 0 25 V The charger must pass CE Europe 3C China FCC North America A tick Australia authentication The charger can charge and supply power to the phone simultaneously Power distribution network and power management function Power distribution network Includes all filtering networks and cables Backup battery managemen...

Page 45: ...is of B type The software does not support OTG function now For details about the conceptual diagram and component layout for maintenance see the following compressed files HD1FRONTM rar U9500_Bottom rar U9500_TOP rar 9 2 Failure and Handling Process 9 2 1 Power On Failure Cause If a phone cannot be powered on inspect the phone to locate the fault Possible causes for the power on failure are liste...

Page 46: ...at might be damaged or short circuited U401 Dual input and gate U1301 Energymeter chip J1601 LCD BTB connector J1301 Battery connector U902 AP core voltage power supply VBATT test points Handling Process Detailed fault location methods are described as follows Press the Power key and listen whether the vibrator vibrates If the vibrator vibrates the LCD is damaged Change the LCD and check whether t...

Page 47: ...lure is caused by a faulty PCBA To locate the fault on the PCBA connect the phone to a USB charger and check the current There are three scenarios large current low current and no current The following sections provide detailed analysis on the three scenarios 9 2 2 Excessive Current Causes Large current is usually caused by short circuit The current reaches 500 mA or above the over current protect...

Page 48: ...2012 6 30 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 43 Figure 9 6 Components that might be short circuited VBATT test points Handling Process Figure 9 7 shows the process for handling the excessive current power on failure ...

Page 49: ...ral hundred mA Figure 9 8 shows the components damage on which can cause the weak current power on failure N Resolder or replace correspondin g components Check whether the VPH_PWR is short circuited End After the phone is connected to a USB charger or fake battery and the Power key is pressed a large current is detected Is the VBAT short circuited Are the elements of the battery connector short c...

Page 50: ...process for the weak current power on failure N Resolder or replace U901 Resolder or replace VCXO900 and U501 Resolder or replace U901 Check if other circuits especially the U902 and U3201 are in good condition After the phone is connected to a USB charger or fake battery and the Power key is pressed a low current is detected and the phone fails to be powered on Is the power output of elements on ...

Page 51: ...PBU System_Engineering HWRP HWREF t ools OMAPFlash Software Forms AllItems aspx RootFolder 2fsites 2fOMA P_PBU 2fSystem_Engineering 2fHWRP 2fHWREF 2ftools 2fOMAPFlash 2fSoftware 2fOfficial 20Builds FolderCTID View 58145661 3285 493 4 B1E0 14D122A54E89 To use OmapFlash_mDDRtest perform the following steps Step 1 After the tool is installed enter CMD in the start interface to open the editor Step 2 ...

Page 52: ...9 10 and Figure 9 11 show the components damage on which can cause the no current power on failure Figure 9 10 Components that might be damaged Figure 9 11 Component that might be damaged Handling Process Figure 9 12 shows the process for handling the no current power on failure J1301 Battery connector J2201 HD1FRON BTB connector Q1901 MOS diode ...

Page 53: ...g Failure Circuit Diagram Figure 9 13 shows the charging circuit N Fasten or replace the FPC Resolder or replace the battery connector Resolder or replace Q1901 After the phone is connected to a USB charger or fake battery and the Power key is pressed no current is detected Is the Power key FPC in good condition Is the battery connector in good condition Y N Is Q1901in good condition N Y Resolder ...

Page 54: ... circuit Cause The charging chip BQ24161 is specially used for U9500 for charging control If U9500 operates properly but cannot be charged check BQ24161 and replace it with U1901 If the phone still fails to be charged the circuit monitoring the battery charge level may be faulty In this case replace U1301 to see whether the charging function resumes Figure 9 15 and Figure 9 16 shows the components...

Page 55: ...al Copyright Huawei Technologies Co Ltd 50 Figure 9 15 Component that might be damaged Figure 9 16 Component that might be damaged 9 2 6 Display Failure Cause Figure 9 17 and Figure 9 18 show the components damage on which can cause the display failure J1301 Battery connector U1901 Charging chip ...

Page 56: ...ss The U9500 LCD is connected to the PCBA using a BTB connector The backlight LED is integrated with the LCD When the display failure occurs check whether the LCD BTB connector is properly fastened and whether U1600 U1601 and their peripheral components are damaged You can also conduct a replacement test to locate the failure J1601 LCD BTB connector D1600 LCD backlight diode U1600 LCD backlight po...

Page 57: ...nd Figure 9 21 show the components damage on which can cause the vibration failure N Check whether the LCD backlight power supply s output is about 27 V Check whether the LCD power supply has 5 4 V output Display failure Y Is there nothing displayed on the LCD Use the replacement test method to locate where LCD or PCBA the fault is N Y N Y N Is the LCD properly installed Reconnect the LCD to the P...

Page 58: ...ietary and Confidential Copyright Huawei Technologies Co Ltd 53 Figure 9 20 Component that might be damaged Figure 9 21 Component that might be damaged Handling Process Figure 9 22 shows the process for handling the vibration failure J2203 Main FPC BTB connector U901 PM chip ...

Page 59: ...re Cause Figure 9 23 and Figure 9 24 shows the components damage on which can cause the microSD card detection failure Check whether the vibrator circuit and PCB cabling are normal Vibration failure Does the vibrator never vibrates N Check whether the main FPC is in good contact with the PCBA Y Does the vibrator vibrate after being powered N Replace the vibrator Y N Resolder or replace the compone...

Page 60: ...tial Copyright Huawei Technologies Co Ltd 55 Figure 9 23 Components that might be damaged Figure 9 24 Component that might be damaged Handling Process Figure 9 25 shows the process for handling the microSD card detection failure J2101 microSD card holder U901 PM chip U301 U301_POP Main chip DDR ...

Page 61: ...mponents damage on which can cause the USIM card detection failure microSD card detection failure Check whether the microSD card holder appearance is normal N Resolder or replace the card holder J2101 Y Check whether the power supply pin VDD MMC1 of the microSD card is normal N Resolder or replace U901 Y Check whether the microSD_DETECT circuit is connected and whether signal cables are in good co...

Page 62: ...ogies Co Ltd 57 Figure 9 26 Component that might be damaged Figure 9 27 Component that might be damaged Handling Process When the USIM card detection failure occurs check whether the phone is set to the airplane mode If the phone is not in airplane mode perform steps listed in Figure 9 28 J2102 SIM card holder U3801 Modem ...

Page 63: ...e Figure 9 29 shows the components damage on which can cause the TP failure USIM card detection failure Check whether the USIM card holder is in good condition N Resolder or replace J2102 Y Check whether the power supply pin VSIM_VAR of the USIM card is normal N Resolder or replace U3801 Y Check whether the SIM_CD circuit and signal cables are in good condition N Resolder or replace the component ...

Page 64: ...ed Handling Process When the TP failure occurs the LCD displays information but cannot be unlocked The TP is an independent component and shares multiplexing ports for power supply and communication with other unit circuits You can perform the replacement test to locate the failure Figure 9 30 shows the process for handling the TP failure U901 PM chip J2201 HD1FRONT BTB connector ...

Page 65: ... the possible reasons that can cause the light sensor failure Figure 9 31 Possible reason The component is smudged TP failure Does the phone resume its functions after having the original TP module group replaced Y Replace the TP module group N Check whether the TP power supply is normal N Resolder or replace U901 Y Check whether signals on the RST INT and I2C are normal N Resolder or replace the ...

Page 66: ...Handling Process Figure 9 33 shows the process for handling the light sensor failure Figure 9 33 Handling process for the light sensor failure Light sensor failure Check whether the sensor panel is blocked by any foreign matters and whether the rubber is properly installed Y Remove the foreign matters and install the rubber to the correct position N Check whether J2202 is well connected to the PCB...

Page 67: ...right Huawei Technologies Co Ltd 62 9 2 12 Acceleration Sensor Failure Cause The acceleration sensor is damaged Figure 9 34 shows the acceleration sensor Figure 9 34 Acceleration sensor Handling Process Figure 9 35 shows the process for handling the acceleration sensor failure U2004 Acceleration sensor ...

Page 68: ... Failure Cause Figure 9 36 shows the component damage on which can cause the compass failure Figure 9 36 Component that might be damaged U2005 Compass chip Acceleration sensor failure Check whether the power supply voltage on the sensor is normal N Check the power supply circuit Y Does the acceleration sensor function properly after having the acceleration sensor chip U2004 replaced Y End Y Resold...

Page 69: ...37 Handling process for the compass failure 9 2 14 Gyroscope Failure Cause Figure 9 38 shows the component damage on which can cause the gyroscope failure Figure 9 38 Component that might be damaged U2003 Gyroscope chip Compass failure Check whether the power supply voltage on the sensor is normal N Check the power supply circuit Y Does the Compass functions properly after having U301 replaced Y E...

Page 70: ...roscope failure Figure 9 39 Handling process for the gyroscope failure 9 2 15 Camera Failure Cause Figure 9 40 and Figure 9 41 show the components damage on which can cause the camera failure Gyroscope failure Check whether the power supply voltage on the sensor is normal N Check the power supply circuit Y Does the gyroscope functions properly after having U2003 replaced Y End N Resolder or replac...

Page 71: ...nts that might be damaged Handling Process There are three common types of camera failures Failure to access the camera application Rear camera Failure to focus Artifacts black screen or lines on the capture screen J2202 Flashlight BTB connector J1800 Rear camera BTB connector U3203 U3204 U3205 Load switch U3206 Load switch U3201 2 85V DCDC U1800 Flashlight driver U3207 U3208 Load switch U3105 1 2...

Page 72: ...ment test to locate the fault If the fault is on the camera module replace the camera module If the fault is on the PCBA check the camera power supply circuit and flashlight driver Handling process for type 3 failure Replace the camera module 9 2 16 Phone Audio Failure Cause Figure 9 42 shows the components damage on which can cause the phone audio failure Figure 9 42 Components that might be dama...

Page 73: ...n failure Voice transmission failure Check whether the microphone module and sub board are in good condition N Replace the microphone module or sub board Y Check whether the signal circuit is in good condition N Rectify the faults on the microphone sub board FPC flat cables and relevant signal circuits on the PCBA Y Replace U1201 Ringing failure Check whether the phone speaker functions properly N...

Page 74: ...s for the voice reception failure 9 2 17 Headset Audio Failure Handling Process for the Headset Speaker failure Figure 9 46 shows the process for handling the headset speaker failure Voice reception failure Check whether the receiver functions properly N Replace the receiver Y Check whether the receiver FPC is in good condition N Replace the FPC Y Check whether the signal circuit is in good condit...

Page 75: ...ss for Headset Microphone Failure Figure 9 47 shows the process for handling the headset microphone failure Headset speaker failure Check whether J1500 functions properly N Replace J1500 Y Check whether the components on the left and right earphone channels are in good condition N Replace relevant components Y Check whether the headset is short circuited N Rectify the faults on the signal circuit ...

Page 76: ... scrap iron speaker noise occurs Figure 9 48 and Figure 9 49 show the possible causes for the speaker noise problem Figure 9 48 Possible cause 1 There are foreign matters in this area No sound heard from the headset Check whether J1500 functions properly N Replace J1500 Y Check whether the voltage on AUD_HBIAS is normal N Locate the fault and resolve it Y Check whether the headset microphone is sh...

Page 77: ... 30 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 72 Figure 9 49 Possible cause 2 The speaker is improperly installed or smudged by foreign matters Handling Process Figure 9 50 shows the process for handling the speaker noise problem ...

Page 78: ... 9 51 shows Wi Fi and Bluetooth circuits Speaker noise Check whether the speaker is damped Y Handle the problem according to company regulations N Check whether the speaker is interfered by scrap iron Y Handle the problem according to company regulations N Does the phone functions properly after having the speaker replaced Y End Replace the back cover assembly Does the phone function properly afte...

Page 79: ...ential Copyright Huawei Technologies Co Ltd 74 Figure 9 51 Wi Fi and Bluetooth circuits Cause Figure 9 52 and Figure 9 53 show the components damage on which can cause the Wi Fi failure Figure 9 52 Components that might be damaged U3401 FM BT WL three in one chip Z3599 Filter U3501 RF switch ...

Page 80: ...30 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 75 Figure 9 53 Components that might be damaged Handling Process Figure 9 54 and Figure 9 54 shows the process for handling the Wi Fi Bluetooth failure J3503 J3504 BT WL antenna springs ...

Page 81: ... components damage on which can cause the FM failure Wi Fi Bluetooth failure Check whether the software functions properly N Resolder or replace U3401 Y Check whether the antenna spring J3503 is in good contact with the antenna N Ensure the two are in good contact Y Check whether Z3599 functions properly N Rectify the faults on the signal circuit End Does the phone functions properly after having ...

Page 82: ...fidential Copyright Huawei Technologies Co Ltd 77 Figure 9 55 Components that might be damaged Figure 9 56 Component that might be damaged Handling Process Figure 9 57 shows the process for handling the FM failure U1201 Codec chip J1500 Headset jack holder U3401 FM BT WL three in one chip ...

Page 83: ...FM failure 9 2 21 GPS Failure Circuit Diagram Figure 9 58 shows the GPS circuit Figure 9 58 GPS circuit FM failure Check whether J1500 functions properly N Replace J1500 Y Check whether the signal input circuit is poorly soldered or short circuited Y Resolder or replace the faulty component N Replace U1201 Does the phone function properly after having U3401 replaced Y End N ...

Page 84: ...chnologies Co Ltd 79 Cause Figure 9 59 and Figure 9 60 show the components damage on which can cause the GPS failure Figure 9 59 Components that might be damaged Z3601 Band pass GPS filter U301 U301_POP Main chip DDR U3601 GPS chip TCX03601 GPS clock J3604 GPS antenna grounding spring Z3602 Band pass GPS filter U3699 ...

Page 85: ...sue 1 2 2012 6 30 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 80 Figure 9 60 Components that might be damaged Handling Process Figure 9 61 shows the process for handling the GPS failure J3602 3603 GPS antenna springs ...

Page 86: ... shows the components damage on which can cause the HDMI failure GPS failure Check whether the antenna spring J3603 is in good contact with the antenna N Ensure the two are in good contact Y Does the phone function properly after having Z3601 and then Z3602 replaced Y End N Does the phone function properly after having U3699 replaced Y End N Replace U301 Does the phone function properly after havi...

Page 87: ...Huawei Technologies Co Ltd 82 Figure 9 62 Components that might be damaged Handling Process Figure 9 63 shows the process for handling the HDMI failure U301 U301_POP Main chip DDR U3104 3 3V LDO U3101 MHL chip U1900 USB switch J1900 USB MHL R3109 MHL_CBUS_ID Pull up resistor U3103 Level switch U3106 Inverter ...

Page 88: ...fault by replacing U3104 and other components on the power supply circuit respectively Y Check whether the MHL output circuit is in good condition N Y Replace U301 Does the phone function properly after having U3103 replaced Y End N Check whether J1900 is in good contact with the MHL adapter cable Y N Ensure the two are in good contact Check whether the MHL control circuit is good condition N Rect...

Page 89: ... Confidential Copyright Huawei Technologies Co Ltd 84 9 2 23 WCDMA RF Reception Failure Cause Figure 9 64 and Figure 9 65 show the components damage on which can cause the WCDMA RF reception failure Figure 9 64 Components that might be damaged U2801 Audience U3801 Modem U3501 RF switch ...

Page 90: ...d 85 Figure 9 65 Components that might be damaged Handling Process Figure 9 66 shows the process for handling the WCDMA RF reception failure U4704 RF PA U4801 RF PA power supply chip J4710 RF coaxial connector U4702 RF duplexer U4703 RF switch U4701 Dual mode RF transceiver chip U4708 RF clock 26M U4802 Transceiver power supply chip ...

Page 91: ...on Y End N Check whether the power supply to the RF circuit is normal N Replace U4802 Y Does the phone function properly after having U4703 and then U4702 replaced Y End N Replace U3801 Does the phone function properly after having U4701 replaced Y End N Is the RF index normal N Y Check whether the RF cable is in good condition and whether the antenna spring is in good contact with the antenna Is ...

Page 92: ...nd Confidential Copyright Huawei Technologies Co Ltd 87 9 2 24 GSM RF Reception Failure Cause Figure 9 67 and Figure 9 68 show the component damage on which can cause the GPS RF reception failure Figure 9 67 Components that might be damaged U2801 Audience U3801 Modem U3501 RF switch ...

Page 93: ...td 88 Figure 9 68 Components that might be damaged Handling Process Figure 9 69 shows the process for handling the GSM RF reception failure U4704 RF PA U4801 RF PA power supply chip J4710 RF coaxial connector U4702 RF duplexer U4703 RF switch U4701 Dual mode RF transceiver chip U4708 RF clock 26M U4802 Transceiver power supply chip ...

Page 94: ... Y End N Check whether the power supply to the RF circuit is normal N Replace U4802 Y Does the phone function properly after having U4703 and then U4702 replaced Y End N Replace U3801 Does the phone function properly after having U4701 replaced Y End N Is the RF index normal N Y Check whether the RF cable is in good condition and whether the antenna spring is in good contact with the antenna Is th...

Page 95: ...Confidential Copyright Huawei Technologies Co Ltd 90 9 2 25 GSM RF Transmission Failure Cause Figure 9 70 and Figure 9 71 show the components damage on which can cause the GSM RF transmission failure Figure 9 70 Components that might be damaged U2801 Audience U3801 Modem U3501 RF switch ...

Page 96: ...o Ltd 91 Figure 9 71 Components that might be damaged Handling Process Figure 9 72 shows the process for handling the GSM RF transmission failure U4704 RF PA U4801 RF PA power supply chip J4710 RF coaxial connector U4702 RF U4703 RF switch U4701 Dual mode RF transceiver chip U4708 RF clock 26M U4802 Transceiver power supply chip ...

Page 97: ... Y End N Check whether the power supply to the RF circuit is normal N Replace U4802 Y Does the phone function properly after having U4703 U4701 and then U4704 replaced Y End N Does the phone function properly after having U4701 replaced Y End N Is the RF index normal N Y Check whether the RF cable is in good condition and whether the antenna spring is in good contact with the antenna Replace U3801...

Page 98: ...ng Issue 1 2 2012 6 30 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 93 If all the RF indexes are abnormal check the power supply circuit antenna feedpoint antenna switch board antenna cable and RF test socket NOTE ...

Page 99: ... three keys commonly seen on Android smartphones a Power key volume up key and volume down key The battery used for U9500 cannot be removed Therefore the Power key is designed with a forcible power off function which facilitates scenarios such as software upgrade To forcibly power off the phone press the Power key for at least 10s Figure 10 1 shows the U9500 keys Figure 10 1 U9500 keys Menu key Ba...

Page 100: ...ple when it is released it recovers to the original color 5 LCD test The LCD displays a white screen The LCD displays a black screen The LCD displays RGB strips The lightness of the LCD backlight is enhanced gradually and then cyclically The tri color LED display RGB colors cyclically 6 Keypad LED test The keypad LED is lighted cyclically 7 Rear camera test The LCD displays the picture once it is ...

Page 101: ...urns green Press the answer key on the headset and the large cycle on the LCD turns to a small one as its color turns from blue to brown Pull out the headset If the Out icon turns green the test is successful 17 HDMI test The LCD indicates that the phone is under the HDMI test Use a USB cable to connect the phone to a HD television Check whether the video and audio can be transmitted to the televi...

Page 102: ...4 Adjust the distance between the phone and access point to observe the changes of Wi Fi signal strength on the phone Step 5 When the network connection is normal open the web browser and access and website to test the network quality If no problems are found exit the Wi Fi test If any problems are found troubleshoot the mobile phone or send it to an advanced service center for repair End 10 4 Voi...

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