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Huawei U9200, Maintenance Manual

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Huawei U9200 Maintenance Manual Download Page 52

 

 

U9200 Maintenance Manual 

INTERNAL 

 

 

(2012-06-13) 

Huawei Proprietary and Confidential 

Copyright © Huawei Technologies Co., Ltd. 

Page 52 of 80 

 

9.4 Display Failure 

Figure 9-8

 

Display failure troubleshooting process 

 

 

Display failure 

Does the display 

absolutely fail? 

N 

The fault is 
located either on 
the AMOLED or 
the main board. 
Use the 
replacement 
method to locate 
the fault. 

Y 

Is the connection between the 

AMOLED and the main board 

in good condition? 

Reconnect them. 

Y 

Is the AMOLED in good 

condition? 

Replace the 
J1602 or 
peripheral 
components. 

Y 

Replace the LCD. 

N 

N 

Y 

Summary of Contents for U9200

Page 1: ...U9200 Maintenance Manual V1 0 Prepared by Date 2012 03 08 Reviewed by Date Approved by Date Huawei Technologies Co Ltd All rights reserved ...

Page 2: ...ance Manual INTERNAL 2012 06 13 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd Page 2 of 80 Change History Date Version Change Reason Section No Description Author 2012 03 08 V1 0 Li Xianxi ...

Page 3: ...ain Board 11 4 1 List of Components on Main Board 11 5 Software Upgrade 16 5 1 Upgrade Preparation 16 5 2 microSD Card Upgrade 16 5 2 1 Normal Upgrade 16 5 2 2 Forcible Upgrade 16 5 3 Troubleshooting 17 6 Maintenance Tools 18 7 Disassembly Procedure 20 7 1 Disassembly Procedure 20 8 Assembly Procedure 28 8 1 Installing the Air Filter 28 8 2 Installing the Sub Board to the Front Cover 28 8 3 Instal...

Page 4: ...ecture Introduction 40 9 2 Power On Failure 46 9 2 1 Large Current DC Power Supply 46 9 2 2 Low Current DC Power Supply 47 9 2 3 No Current DC Power Supply 49 9 3 Charging Failure 50 9 4 Display Failure 52 9 5 Vibration Failure 53 9 6 microSD Card Identification Failure 54 9 7 USIM Card Identification Failure 55 9 8 TP Failure 55 9 9 Touch Key Failure 57 9 10 Proximity Sensor and Auto Light Sensor...

Page 5: ...2 06 13 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd Page 5 of 80 9 23 GSM RF Transmitting Failure 75 10 Functional Test 77 10 1 Keypad Introduction 77 10 2 MMI Test 77 10 3 Wi Fi Test 80 10 4 Voice Call Test 80 ...

Page 6: ...he U9200 Figure 1 1 U9200 1 2 Features Table 1 1 lists the specifications of the U9200 Table 1 1 Specifications of the U9200 Item Specifications Phone type Touchscreen smartphone Dimensions H x W x D 7 69 mm x 129 mm x 64 8 mm Working band GSM GPRS EDGE 850 900 1800 1900 UMTS W850 W900 AWS W1900 W2100 HSPA downlink 21 Mbps uplink 5 76 Mbps Weight About 110 g Technical standard WCDMA GSM ...

Page 7: ...olution 960 x 540 pixels qHD Expansion card Supports a maximum of 32 GB microSD card Antenna Built in antenna Camera Rear camera 8 megapixels with dual LED flashlights Front camera 1 3 megapixels Bluetooth Bluetooth 3 0 Wi Fi 802 11b g n GPS GPS AGPS FM Supported Features WCDMA GSM Android 4 0 4 3 inch QHD AMOLED capacitive touchscreen 1670 mAh Li ion battery Rear camera 8 megapixels autofocus wit...

Page 8: ...s 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 is lead free and c...

Page 9: ... as reference when requesting spare parts 3 2 Component List Table 3 1 lists the components of the U9200 Table 3 1 Components of the U9200 Part Number Description Quantity 03021PLT Manufactured Board U9200 1 HD1U9200MG U9200 1Handset Main Board GSM 4 Band W2100 W1900 W1700 W900 W850 Terminal Dedicated 2 2 1 NOTE Battery cover protective film Battery cover Bluetooth antenna GPS antenna Shielding co...

Page 10: ...display AMOLED 4 29 540 RGB 960 16 7M 16 9 2 368mm typ with touch panel BTB 1 23060074 Camera Module Group CMOS 1 3M FF Front HD BTB 1 23060080 Camera Module Group 1 3 2 CMOS BSI 8M 3264 2448 Terminal Dedicated 1 27160904 Terminal Antenna 824MHz 960MHz 1710MHz 2170MHz larger than 3dBi isotropic linear polarization smaller than 3 4W U9200 Main Antenna LDS Antenna Amphenol 1 27160905 Terminal Antenn...

Page 11: ...signal J2102 SIM card connector Failure symptom unexpected problems of SIM card J1800 camera connector Failure symptom rear camera failure TCXO3601 GPS crystal oscillator Failure symptom GPS failure U3103 level shifter chip Failure symptom MHL failure U3102 analog switch Failure symptom USB and MHL failure U3501 Wi Fi Bluetooth switch Failure symptom Wi Fi Bluetooth failure J3505 Wi Fi Bluetooth a...

Page 12: ...nal Dedicated J1800 J1801 J2201 J2202 14240247 IO Connector Micro_B Type Female 5pins Side Plugging Type SMT 4 Dip Mid Mount 1 5mm Height from PCB Top Side Terminal Dedicated J1900 14240228 Card Connecter MicroSD Receptacle 8pin PUSH PUSH 1 1mm Have Lock Without Hold Peg 1 45mm Terminal Dedicated J2101 14240301 Card Socket Connector SIM Card Socket 6pin PUSH PUSH 1 25mm With Lock 1 2mm Terminal De...

Page 13: ... 1 4 Terminal dedicated U501 39070114 Power Management IC 2 5 4 8 V seven DC DC eleven LDO FBGA187 Terminal Dedicated U901 39110646 Power Driver Buck DCDC CSP16 OMAP platform core driver Terminal Dedicated U902 40060351 NAND Flash 4GB EMMC V4 41 52 MHz 1024 KB 3 3 V FBGA153 Pb free Terminal Dedicated U1102 43110064 AUDIO Chip audio codec OMAP Solution PBGA120 Terminal Dedicated U1201 39070073 0 3 ...

Page 14: ...e Inverter Gate SC 70 9 0ns 4 0mA CMOS CMOS U3169 39110566 Switching Regulators 1 4V 1 5A SMT Terminal Dedicated U3201 U3259 39210010 Terminal Baseband process IC Single Band 2 4 GHz WLAN Bluetooth 2 1 FM Single chip BCM4330 2 3 5 5 V WLBGA133 Pb free U3401 47140049 RF Switch 0 5 3 0 GHz SP3T 0 45 dB 1 22 20 dB TSON 200 260V HBM Terminal Dedicated U3501 39210004 Terminal Baseband Peripheral IC GPS...

Page 15: ...8 dB 20125 Terminal Dedicated Z3599 13010180 SAW filter 1575 42 MHz 0 9dB 1 4 1 1 mm for terminal using only Z3601 Z3602 51633362 U8650_WIFI_CHIP_GASKET U8650 U3401 13080147 Duplexer RX 1805 1880MHz TX 1920 1980MHz RX 2110 2170 MHz TX 1710 1755MHz RX 2110 2155MHz TX 1850 1910MHz RX 1930 1990MHz TX 824 849MHz 869 894 MHz TX 880 915MHz RX 925 960MHz 3dB 3 95dB 47dB SMT Terminal Dedicated U4702 47100...

Page 16: ...l upgrade Forcible upgrade 5 2 microSD Card Upgrade 5 2 1 Normal Upgrade 1 Create a folder named dload in the root directory of the microSD card 2 Copy the upgrade file update app to the dload folder 3 Install the microSD card on the phone and power the phone on 4 Enter 2846579 in dialing mode Choose ProjectMenu Upgrade SD card upgrade and click Confirm The upgrade progress is displayed on the LCD...

Page 17: ...the upgrade is completed the phone automatically restarts If the upgrade fails the phone stays on the upgrade page and an upgrade failure message is displayed 5 3 Troubleshooting Table 5 2 describes the troubleshooting process Table 5 2 Troubleshooting process Failure Solution microSD card upgrade failure 1 Check whether the upgrade file is correct 2 Check whether the upgrade file storage director...

Page 18: ... Table 6 1 Maintenance tools Name constant temperature heat gun Usage to heat components Name soldering iron Usage to solder components Name DC power supply Usage to supply DC power Name soldering table Usage to secure the PCBA Name lead free solder wire Usage soldering Name digital multimeter Usage to measure during repair Name toolkit Usage to assemble and disassemble terminal products ...

Page 19: ...U9200 Maintenance Manual INTERNAL 2012 06 13 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd Page 19 of 80 Name electric screwdriver Usage to fasten and remove screws ...

Page 20: ...ocedure 1 Remove the microSD card slot holder and remove the Philips screws the screws are covered by a white anti dismantle label Figure 7 1 microSD card slot holder 2 Remove the battery cover 1 Stick a crowbar into the gaps at the bottom corners respectively and pry outwards to remove the two buckles 2 Remove the three bottom female buckles 3 Remove the top three buckles ...

Page 21: ...irection where the volume key should be placed Place the key of a higher flexibility at the upper position After the two keys are installed check whether they are installed at the correct position without interference with other components around them Figure 7 3 Reinstalling the volume keys NOTE Stick the crowbar into the two gaps first Move the rear cover upwards to open the side buckles Higher f...

Page 22: ... Figure 7 4 Removing the two Philips screws 2 Hold the housing and sub board with your left hand and remove the coaxial line switch using tweezers with your right hand Stick a crowbar into the spacing as shown in the following figure to pry upwards to remove the sub board Disconnect the BTB connector Figure 7 5 Removing the sub board 4 Remove the main shielding cover and Flash_FPC 1 Remove the fou...

Page 23: ...hesive backed is damaged if it is change the adhesive and remove the residues from the magnesium alloy Figure 7 7 Lifting the volume key FPC and power key FPC 3 Remove the shielding cover Stick tweezers into the spacing as shown in the following figure to pry upwards Take care not to damage the connector under the shielding cover or deform the shielding cover Remove the shielding cover from the tw...

Page 24: ... using tweezers 3 Put your nail in the groove and move upwards to open the battery connector 4 Stick tweezers into the bottom right corner of the main board and pry upwards Apply a proper force to avoid damage to the two buckles on the left and right Figure 7 9 Removing the main board Stick tweezers into the spacing Buckles Buckle Put your nail in the groove and move upwards to open the battery co...

Page 25: ...of the battery and pry upwards The external layer of the battery is aluminum and there are two pieces of adhesive between the battery and the front cover You must take care not to pierce the aluminum layer Figure 7 10 Removing the battery 7 Remove the components from the main board 1 Remove the Bluetooth and GPS antennas There is a buckle on the back of each antenna Take care not to break the buck...

Page 26: ... Copyright Huawei Technologies Co Ltd Page 26 of 80 Figure 7 11 Removing the components from the main board 2 Remove the rear camera Open the BTB connector and remove the camera from the front surface Figure 7 12 Removing the rear camera Bluetooth antenna GPS antenna Buckle Buckle ...

Page 27: ...td Page 27 of 80 3 Remove the front camera Remove the silica gel jacket from the triple color LED disconnect the BTB connector and remove the front camera Figure 7 13 Removing the front camera 8 The touchscreen and LCD are glued to the front cover and cannot be disassembled Silica gel jacket of the triple color LED ...

Page 28: ...8 Assembly Procedure 8 1 Installing the Air Filter 8 2 Installing the Sub Board to the Front Cover Prepare a receiver and check whether it is in good condition Place the receiver on the correct position on the touchscreen and press it for 3 seconds Step 1 Paste a piece of adhesive on the back of the sub board and tear off the liner ...

Page 29: ...012 06 13 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd Page 29 of 80 Step 2 Place one end of the sub board under the hook Step 3 Install the sub board to the correct position where both ends are hooked tightly ...

Page 30: ...the four liners in the sequence as shown in the figure above Step 3 Paste the FPC to the board by aligning it with the two positioning pins on the front cover Step 4 Route the FPC through the hole tear off the two liners and paste the FPC to the correct position Paste the FPC in this direction Step 5 Align the FPC with the two positioning pins and paste it to the board Step 6 Push the FPC upwards ...

Page 31: ... 06 13 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd Page 31 of 80 8 4 Wiping the Front Cover Step 1 Wipe the areas to be glued using a piece of dust free cloth with some absolute alcohol Step 2 Tear off the liner ...

Page 32: ...n the glue dispenser Step 2 Power on the glue dispenser and dispense glues on the components Step 3 Route the FPC through the hole on the front cover Note Do not glue the TP Step 4 Align the front end of the TP with one edge of the front cover and slide the TP slowly downwards to install it to the correct position Step 1 Place the front cover components on the pre pressing machine Step 2 Power on ...

Page 33: ...mponents on the packing pressure machine Step 2 Take the top cover Step 3 Place the top cover squarely on the packing pressure machine and press the top cover tightly The duration of packing pressure is two hours Step 1 Place the main board on the jig Step 2 Tear off the two liners Step 3 Paste the REC FPC to the correct position by aligning it with the two positioning pins Step 4 Connect the two ...

Page 34: ...eck whether it is in good condition Step 4 Align the GPS support with the positioning groove on the main board and install it to the correct position Step 5 Check whether the two supports are installed correctly Step 1 Place a front camera on the anticipation bender Step 2 Bend the front camera FPC Step 3 Paste a piece of adhesive to the front camera and tear off the liner Step 4 Connect the two c...

Page 35: ...receiver with the clip upwards and slightly press it for three seconds Step 3 Take three yellow protective films using tweezers and paste them to the three positions as shown in the figure above The clip should be upwards Step 1 Check whether the main board is in good condition Install the sensor light rubber sleeve to the main board with the larger hole downwards Step 2 Align the main board with ...

Page 36: ...ioning Step 1 Run the electric screwdriver to screw the GPS and Bluetooth supports with hex head screws Step 2 Install the two connectors of the Touch FPC and TP to the main board Step 3 Take a rear camera and place it into the correct position on the main board Step 4 Press the camera body with your left hand and push slightly the camera connector with your right hand to be aligned with and conne...

Page 37: ...e in a direction away from the port Step 4 Wait until the entire coaxial line is squeezed into the groove Step 5 The positioned coaxial line is shown in the figure above Step 1 Take an antenna support and check whether it is in good condition Tear off the liner on the back of the support Keep the SPK clip towards left Step 2 Align the right end of the SPK with the support and then press it into th...

Page 38: ...nect the left end Then connect the right end Note Align the battery with side A first and then side B to avoid damage to the connector Step 1 Connect the two connectors on the Flash FPC and main board Step 2 Hook the shielding cover to the main board and then install the shielding cover to the correct position Hook the shielding cover first Step 3 Use tweezers to tear off the two liners on the bac...

Page 39: ...the camera protective film Step 2 Take the rear cover and open the volume key Step 3 Align one side of the rear cover with the main board and then install it to the correct position Step 4 Run the electric screwdriver to screw the rear cover with square head screws Step 5 Paste anti dismantle labels to the screws Step 6 Tear off the liner from the rear camera Paste lens on it and press it for thre...

Page 40: ...one with two ARM Cortex A9 1 5 GB cores and two LPDDR2 ports supporting dual channels to improve system performance The hardware architecture is comprised of three parts AP modem and RF module OMAP4460 AP is a signal input output unit providing ports to the keypad LCD microSD card Bluetooth and camera TWL6040 is an audio management chip supporting encoding and decoding audio signals XGOLD626 is a ...

Page 41: ...into the following four subsystems baseband including the AP and modem BB RF power supply and user interface Table 9 1 describes the modules and units subordinated to each subsystem and their functions Table 9 1 Main board architecture Subsystem Module Unit Function Baseband subsystem OMAP4460 Application subsystem 45 nm dual ARM9 processors microSD card UART USIM I2C I2S HSI MIPI GPIO HDMI Smart ...

Page 42: ...sleep controller Modem PMU 65 nm supply power to MODEM BB reset function two line SMPS eight line LDO Modem memory MCP 1 GB 256 MB EMMC Features power consumption and file system Programs and NV items 8 GB 4 GB DDR RAM Power consumption RAM for program running 1 GB RF subsystem WCDMA and GSM DCS transceiver Smartti UE2 WCDMA RF transceiver comprised of an RFMD chip PMU and peripheral circuits GPS ...

Page 43: ...ing sample which is used for device debugging and testing USIM connector Power supply protective circuit and USIM socket USIM card holder and the corresponding link circuit Keypad and backlight Keypad drive circuit external keypad LED backlight control circuit The volume keys are monitored with the interrupted monitoring method through GPIO When users press the volume key the two top view LED back...

Page 44: ...ty sensor I2C interface controller Ambient light sensor and proximity sensor Power supply subsystem Internal backup battery Li ion battery and interface The nominal output of Li ion battery is 3 7 V 1670 mAh with the number of charging discharging over 500 The Li ion battery must meet the safety requirements in GB18287 External primary power supply travel charger Adapter and interface The charger ...

Page 45: ... Double I2C interfaces I2C controller and SMART REFLEX I2C UVLO Low voltage power off function If the input voltage is lower than a threshold for a specified period the phone is powered off WDT reset Supports overflow reset of WDT counter Over temperature protection If the junction temperature is over 150 C the phone is powered off automatically Internal drive circuit There are four LED drivers on...

Page 46: ...ates the LCD is damaged Change the LCD and check whether the phone can be powered on 2 If the motor does not rotate connect the phone to a USB charger and if the phone enters the charging state the FPC of the power key or the battery is faulty 3 If the phone does not enter the charging state the main board is faulty or the battery is faulty In this case disassemble the phone to inspect whether the...

Page 47: ... mA After the phone is connected to a USB charger or simulated battery and the power key is pressed a large current is detected Is the VBAT circuit shorted N Y Are the circuit elements of the battery connector shorted Y Resolder or replace the shorted element N Is the U1901 U1301 U4801 or U4704 shorted N Y Resolder or replace the shorted element Are other circuits especially those close to the con...

Page 48: ... OmapFlash_mDDRtest provided by TI to check whether the DDR2 is normal Ensure that the PC can identify the port before you use the tool because the PC is connected to the U9200 through a USB cable The OmapFlash_mDDRtest is downloaded at the following website https sps01 itg ti com sites OMAP_PBU System_Engineering HWRP HWREF tools OMAP Flash Software Forms AllItems aspx RootFolder 2fsites 2fOMAP_P...

Page 49: ... 80000000 9FFFFFFC to check whether DDR2 channel 1 is normal 5 Enter OMAPFlash exe v 2 omap 4 p SEVM_MDDR_ELPIDA_8G t 600 command mtquick A0000000 BFFFFFFC to check whether DDR2 channel 2 is normal 6 If the DDR2 is normal the interface displays No Problem Found otherwise it displays Operation Failed For details about how to use the OmapFlash_mDDRtest see the following compressed file OmapFlash_mDD...

Page 50: ...place it with the U1901 If the phone still fails to be charged the circuit monitoring the battery charge level may fail In this case replace the U1301 After the phone is connected to a USB charger or simulated battery and the power key is pressed no current is detected Is the FPC of the power key in good condition N Fasten or replace the FPC Y Is the battery connector in good condition N Resolder ...

Page 51: ...al INTERNAL 2012 06 13 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd Page 51 of 80 Figure 9 6 Schematic diagram of the charging circuit Figure 9 7 Schematic diagram of the battery management module ...

Page 52: ...ure troubleshooting process Display failure Does the display absolutely fail N The fault is located either on the AMOLED or the main board Use the replacement method to locate the fault Y Is the connection between the AMOLED and the main board in good condition Reconnect them Y Is the AMOLED in good condition Replace the J1602 or peripheral components Y Replace the LCD N N Y ...

Page 53: ...oubleshooting process Vibration failure Does the vibration absolutely fail N Check if the connection between the motor board and the main FPC is in good condition Y Does the motor vibrate normally after a USB charger is connected to the phone Replace the motor Y Are the motor channel and PCB cabling in good condition Resolder or replace the component Resolder or replace the U901 N N Y ...

Page 54: ...d detection failure troubleshooting process The microSD card fails to be identified Is the card holder in good condition N Resolder or replace the card holder J2101 Y Is the power supply module VDD_MMC1 in good condition Resolder or replace the U901 Are the SD_DETECT and signal cables in good condition Resolder or replace the signaling channel component Resolder or replace the U301 N N Y Y ...

Page 55: ... of power supply and communication with other unit circuits therefore when the touchscreen is faulty you can adopt the replacement method to locate the fault Replace the AMOLED and touchscreen module with new modules and determine the fault is located on the touchscreen or the main board The USIM card fails to be identified Is the card holder in good condition N Resolder or replace the card holder...

Page 56: ...roubleshooting process TP failure Is the fault rectified after you replace the TP module with a new one Y Replace the TP module N Is the power supply to the TP module in good condition N Resolder or replace the U901 Y Are the RST INT and I2C signaling channels in good condition N Resolder or replace the TP signaling channel element Y Resolder or replace the J1602 Y ...

Page 57: ... failure troubleshooting process Touch key failure Is the main FPC in a good connection with the main board Y Reconnect the FPC with the main board N Is the fault rectified after you replace the front cover with a new one Y Replace the front cover N Are the RST INT and I2C signaling channels normal N Resolder or replace the touch key element Y Resolder or replace the J2202 Y ...

Page 58: ...n sensor is faulty the compass sensor does not function because the software of the compass sensor depends on the acceleration sensor This is a basis for determining the acceleration sensor failure Proximity sensor and auto light sensor failure Is the panel blocked by foreign matters Is the silicon gel jacket installed correctly Y Remove the foreign matters and install the silicon gel jacket to th...

Page 59: ...s sensor failure troubleshooting process Compass sensor failure Is the power supply normal N Examine the power supply loop Y Is the fault rectified after you replace the acceleration sensor chip U2005 Y End Y N Acceleration sensor failure Is the power supply normal N Examine the power supply loop Y Is the fault rectified after you replace the acceleration sensor chip U2004 Y End Y Resolder or repl...

Page 60: ...er one is good replace this faulty camera and check whether the fault is rectified If both cameras are faulty check whether the cameras can be identified by software and whether the power supply is normal If they cannot be identified or the power supply is abnormal check the circuits on the main board 9 14 Audio Failure 9 14 1 Speaker Failure Figure 9 17 Speaker failure troubleshooting process Spe...

Page 61: ...td Page 61 of 80 9 14 2 MIC Failure Figure 9 18 MIC failure troubleshooting process MIC failure Is the MIC on the keypad in good condition N Replace the MIC or the keypad Y Is the signal circuit in good condition N Rectify the faults of the MIC keypad FPC cable signal circuits on the main board Y Replace the U1201 Y ...

Page 62: ...ceiver Failure Figure 9 19 Receiver failure troubleshooting process Receiver failure Is the receiver in good condition N Replace the receiver Y Is the FPC of the receiver in good condition Replace the FPC Y Is the signal circuit in good condition Rectify the faults of the signal circuits on the main board Resolder or replace the U1201 N N Y ...

Page 63: ...o Sound from Headset Receiver Figure 9 20 No sound from the headset receiver issue troubleshooting process Headset silence Is the J1500 in good condition N Replace the J1500 Y Are the elements of the left and right sound channels in good condition Replace the faulty elements Is the headset circuit shorted Rectify the shorted circuits Y Replace the U1201 N N Y Y ...

Page 64: ... Headset Microphone Figure 9 21 No sound transmitted through the headset microphone issue troubleshooting process No transmission through headset Is the J1500 in good condition N Replace the J1500 Y Is the AUD_HBIAS voltage normal N Locate and rectify the fault Is the MIC circuit in the headset shorted N Rectify the fault of the signal circuit Y Replace the U1201 Y Y ...

Page 65: ... failure troubleshooting process Wi Fi Bluetooth failure Does the software function properly N Resolder or replace the U3401 Y Is the J3503 clip in good contact with the antenna N Ensure the two are in good contact Y Is the Z3599 in good condition N Rectify the fault of the signal circuit End Is the fault rectified after you replace the U3501 Y Y N Rectify the fault of the signal circuit ...

Page 66: ...diagram of Wi Fi Bluetooth signal input circuit 9 17 FM Failure Figure 9 24 FM failure troubleshooting process FM failure Is the J1500 in good condition N Replace the J1500 Y Is the signal input circuit poorly soldered or shorted Y Patch solder or replace the faulty component N Is the fault rectified after you replace the U3401 Y End N Replace the U1201 ...

Page 67: ...eshooting process Figure 9 26 Schematic diagram of GPS circuit GPS failure Is the J3603 clip in good contact with the antenna N Ensure the two are in good contact Y Is the fault rectified after you replace the Z3601 and Z3602 respectively Y End N Is the fault rectified after you replace the U3699 Y End N Replace the U301 Is the fault rectified after you replace the U3601 Y End N ...

Page 68: ...t by replacing the U3104 and other elements of the power supply circuit respectively Y Is the MHL output circuit in good condition N Rectify the fault by replacing the T1901 U1900 U3102 and the elements of the peripheral circuit respectively Y Replace the U301 Is the fault rectified after you replace the U3101 Y End N Is the J1900 in good contact with the MHL transfer cable Y N Ensure the two are ...

Page 69: ...fter you update the software Y End N Is the power supply of the RF circuit normal N Replace the U4802 Y Is the fault rectified after you replace the U4703 and U4702 respectively Y End N Replace the U3801 Is the fault rectified after you replace the U4701 Y End N Is the RF index normal N Y Check if the RF cable is in good condition and the antenna clip in good contact Is the fault rectified after y...

Page 70: ...12 06 13 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd Page 70 of 80 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 71: ... after you update the software Y End N Is the power supply of the RF circuit normal N Replace the U4802 Y Is the fault rectified after you replace the U4703 U4801 and U4704 respectively Y End N Is the fault rectified after you replace the U4701 Y End N Is the RF index normal N Y Check if the RF cable is in good condition and the antenna clip in good contact Replace the U3801 Y End N Is the fault r...

Page 72: ... Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd Page 72 of 80 If all the RF indexes are abnormal check the power supply circuit DC DC transformer supplying power to the PA antenna switch chip RF cable and main chip NOTE ...

Page 73: ...r you update the software Y End N Is the power supply of the RF circuit normal N Replace the U4802 Y Is the fault rectified after you replace the U4703 and U4702 respectively Y End N Replace the U3801 Is the fault rectified after you replace the U4701 Y End N Is the RF index normal N Y Check if the RF cable is in good condition and the antenna clip in good contact Is the fault rectified after you ...

Page 74: ...12 06 13 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd Page 74 of 80 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 75: ...er you update the software Y End N Is the power supply of the RF circuit normal N Replace the U4802 Y Is the fault rectified after you replace the U4703 U4801 and U4704 respectively Y End N Is the fault rectified after you replace the U4701 Y End N Is the RF index normal N Y Check if the RF cable is in good condition and the antenna clip in good contact Replace the U3801 Y End N Is the fault recti...

Page 76: ...12 06 13 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd Page 76 of 80 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 77: ...is designed with a forcible power off function To power off the phone press the power key for 10 seconds which facilitates the software upgrade 10 2 MMI Test Enter 2846579 and select MMI Test_II The LCD displays Starting MMI test Press the volume down key to start the MMI test If a test item fails touch the Menu key to end the current test press the volume down key to enter the next test and press...

Page 78: ...ically 6 Keypad LED test The keypad LED is lighted cyclically 7 Rear camera test The LCD immediately displays the pictures taken by the camera Check whether the camera is of high performance by comparing the picture quality and response speed Press the volume up and volume down keys concurrently to test the camera flash and if the flash does not light up the flash is faulty 8 Front camera test The...

Page 79: ...ted the In icon turns 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 also 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 high definition television Check whether the video and aud...

Page 80: ...cally touch it and enter the password to connect the phone to the network 4 Adjust the distance between the phone and AP to observe the change of Wi Fi network signal strength 5 When the network connection is normal start the web browser and access a website to test the network quality 6 If the test is successful stop the Wi Fi test If the test fails repair the phone again or send it to the advanc...

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