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S7-PRO Maintenance Manual (Basic Version V2.1)

INTERNAL

2012-07-20

Huawei Proprietary and Confidential

Copyright © Huawei Technologies Co., Ltd.

Page 47 of 97

9.2.1 Power-on Failure — High Current

Analysis: Adjust the DC regulated power supply to 5 V/3 A, and connect it to the PRO_DC
interface for power-on. When the device is powered on, the current exceeds 500 mA. In this
case, the power-on failure is usually caused by improper SMT or IC damage. For the
maintenance procedures, see Figure 9-1, Figure 9-2, and Figure 9-3.

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Summary of Contents for Mediapad S7-PRO

Page 1: ...nual Basic Version V2 1 INTERNAL 2012 07 20 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd Page 1 of 97 Mediapad Maintenance Manual Basic Version V2 1 Huawei Technologies Co Ltd All Rights Reserved ...

Page 2: ...ard 8 4 1 Diagram of Components on the Mediapad Main Board 8 4 2 BOM List 9 5 Software Upgrade 14 5 1 Preparation 14 5 2 Upgrade Using the Micro SD Card 14 5 2 1 Upgrade Process 14 5 2 2 Troubleshooting 15 5 3 Upgrade Using the USB 16 5 3 1 Entering the USB Upgrade Mode 16 5 3 2 Installing the USB Device Driver 16 5 3 3 Programming Using the QPST Software 19 5 3 4 Troubleshooting 24 5 4 Viewing th...

Page 3: ...dures for Transmit Failure 69 9 12 1 WCMDA2100 Transmit Calibration Failure 69 9 12 2 WCMDA1900 Transmit Calibration Failure 70 9 12 3 AWS Transmit Calibration Failure 71 9 12 4 WCMDA850 Transmit Calibration Failure 72 9 12 5 WCMDA900 Transmit Calibration Failure 73 9 12 6 GSM HB Transmit Calibration Failure 74 9 12 7 GSM LB Transmit Calibration Failure 75 9 13 Maintenance Procedures for Receiving...

Page 4: ...sts the S7 PRO models and related descriptions The MediaPad has several models The following table lists the differences between these models Model Specification Standard and Frequency Band S7 301u UMTS 900 UMTS 900 MHz 2100 MHz S7 302u UMTS 850 UMTS 850 MHz 1900 MHz 2100 MHz S7 303u UMTS AWS UMTS 1900 MHz 2100 MHz AWS 1 3 Product Specifications Item Description Dimensions H x W x D 190 mm x 124 m...

Page 5: ...930 1990 MHz uplink downlink 2100 MHz IMT 1920 1980 MHz 2110 2170 MHz uplink downlink AWS 1710 1755 MHz 2110 2155 MHz uplink downlink Battery Li ion battery 3 7 V 4100 mAh Video playback time about 6 hours Standby time about 369 hours Interface 3 5 mm TRRS stereo headset interface MicroSD card slot compatible with an SDHC card of a maximum capacity of 32 GB USB port Micro USB 2 0 HDMI HDMI 1 3b ty...

Page 6: ...ough every effort has been made to ensure the accuracy mistakes may still be found If you find any error or have any suggestions contact our customer service personnel 2 2 Maintenance Precautions Only qualified technicians are allowed to perform maintenance and calibration Always wear ESD wrist straps during operation and conduct the maintenance in an ESD room Ensure that all components screws and...

Page 7: ... 14 15 16 7 8 9 10 11 12 17 18 19 20 21 22 23 The exploded view shows the phone structure only and cannot be regarded as a reference for applying for spare parts No Description Quantity 1 Rear camera lens 1 2 Cover B assembly 1 3 POGO PIN 1 4 Diversity antenna support 1 5 Speaker 1 6 Rear camera 1 7 Headset connector 1 8 Speaker FPC 1 9 Main board 1 10 LCD 1 11 Cover A assembly 1 12 TP 1 ...

Page 8: ...m display failure J31 Headset connector Failure symptom no voice J12 connector for power on and voice buttons Failure symptom failure to power on and adjust the voice U6 6D sensor with accelerometer and compass Failure symptom accelerometer and compass failure LCD FPC connector Failure symptom display failure U17 voltage level transformer IC Failure symptom display failure U7 power supply control ...

Page 9: ... U14 speaker power amplifier Failure symptom no sound U11 BT Wi Fi driver IC Failure symptom BT Wi Fi failure U18 coulometer I2C voltage level transformer IC Failure symptom coulometer failure U9 voltage level transformer IC for touchscreen I2C signal Failure symptom touchscreen failure U35 touchscreen power management IC Failure symptom touchscreen failure J6 front camera connector Failure sympto...

Page 10: ... 6 mm J31 15060228 MOSFET P channel Q1 Q17 Q2 Q9 15050014 NPN transistor Q22 Q5 15060153 MOSFET N channel Q1000 Q1001 Q1101 Q1102 Q1103 Q1104 Q1105 Q1206 Q19 39110582 Power Driver Boost DCDC U1 39200270 Power management IC PM8901 U2 47090034 RF low noise amplifier 869 894 1930 1990 2110 217 0 MHz U3 36020366 CMOS 4BIT bidirectional voltage level translator with auto direction sensing U17 U19 U4 38...

Page 11: ...0 2155 MHz TX 1710 1755 MHz U31 38140022 Semiconductor capacitive sensor U33 39200289 Digital base band processor 1 2 GHz MSM8260 U34 39110548 LDO 3 3 V U35 39110567 Switching regulators 2 0 5 5 V U36 39070073 Power management IC 0 3 2 75 V battery coulometer U37 43140104 Connector controller LCD Drive IC U40 13080082 Duplexer RX 1930 1990 MHz TX 1850 1910 MHz U41 47090042 RF low noise amplifier 0...

Page 12: ...072 ESD_EMI Filter 14 V 30 pF 800 3000 MHz Z12 13010131 Sound filter 1960 MHz Z16 13010148 Sound filter 2140 MHz Z17 13080106 Duplexer 1565 1607 MHz 2400 2500 MHz Z18 13010264 SAW filter 1590 16 MHz Z22 40060318 NAND flash 16 GB eMMC V4 4 52 MHz U12 03021CNP Interface board MediaPad HIDS7PIA with TF slot type D HDMI and micro USB connector 15040238 Transient voltage suppression diode 6 V 14 V 10 W...

Page 13: ...R 1x1 14240200 BTB connector male 10Pin 0 4 mm 0 9 mm J3 03021CPB Key board S7 301u HIDS7PKA 1x1 14240200 BTB connector male 10Pin 0 4 mm 0 9 mm J1 38140014 Semiconductor sensor ambient light sensor U1 03021CPF BTB board MediaPad HIDS7PFI 14240221 BTB connector male 40Pin 0 4 mm 0 9 mm J1 J5 03021DTK BTB to ZIF FPC bridge board MediaPad HIDS7PFL 14240221 BTB connector male 40Pin 0 4 mm 0 9 mm J1 3...

Page 14: ...paration Battery At least two bars on the battery level indicator Micro SD card More than 512 M USB cable BOM 97065432 PC Windows 2000 Windows XP File S7 30Xu V100R001C002B027T01 not the final version This version is only for reference Download the latest version for upgrade the upgrade using USB Tool eMMC Software Download For upgrade using the USB Upgrade method Using the Micro SD card Using the...

Page 15: ...rt the device 5 2 2 Troubleshooting During the update using the SD card if the device presents a flash screen indicating the upgrade failure check for any mis operation or incorrect upgrade version You can remove the SD card and try it again or change the SD card Method to check whether the SD card is damaged Because the size of the upgrade package of some version is large try to open the compress...

Page 16: ... message Found New Hardware will be displayed which indicates that the system has entered the USB upgrade mode successfully as shown in the following figure 5 3 2 Installing the USB Device Driver If the driver has not been installed before you must install the driver on the PC before the update using the USB Step 1 When the MediaPad is connected it enters into the Emergency Download mode and a win...

Page 17: ...anual Basic Version V2 1 INTERNAL 2012 07 20 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd Page 17 of 97 Step 2 Select Choose the install from a list or specific location Advanced Then click Next ...

Page 18: ... 1 INTERNAL 2012 07 20 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd Page 18 of 97 Step 3 Click Browse in the window displayed to select the USB driver to be installed as shown in the following figure Then click Next ...

Page 19: ...ile is found the window indicating successful installation will be displayed as shown in the following figure Step 5 The USB port COM15 is shown in the Device Manager window 5 3 3 Programming Using the QPST Software If the QPST software has been installed run the eMMC Software Download tool and do as follows Step 1 Ensure that you select Program Boot Loaders and Program MMC device ...

Page 20: ...es Co Ltd Page 20 of 97 Step 2 Set Flash Programmer file name to MPRG8660 hex and set Boot Image to 8660_msimage mbn Step 3 Click Browse In the Select Port window check whether the value of Phone is Q QCP XXX Download COM15 and whether the port is consistent with that shown in the Device Manager window Then click OK Step1 Step 2 ...

Page 21: ...ownload port is not found in the Select Port window right click the icon in the taskbar on the lower right corner to display the QPST Configuration window In the displayed window click Ports and click Add New Port In the Add New Port window displayed select corresponding USB QC Diagnostic port Double click the selected port to add it to Port on the right Then click OK Step3 ...

Page 22: ...ual Basic Version V2 1 INTERNAL 2012 07 20 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd Page 22 of 97 The following window is displayed if the port is available the Q QCP XXX Download is displayed ...

Page 23: ...pened the save path of rawprogram0 xml will be displayed in Seach path1 Step 5 Click Load patch def and open the modem folder in the upgrade package in the displayed box Then select patch0 xml in the modem folder this step is mandatory otherwise the MediaPad startup will fail Step 6 Select Search path2 and click the icon for browsing Then select the apps folder in the upgrade package in the Seach ...

Page 24: ...mpleted press and hold the Power button for more than 10 seconds to re start the MediaPad 5 3 4 Troubleshooting Click Download if the following dialog box for installing the driver is displayed as shown in the following figure You can ignore it because you may enter the trusted mode that requires no driver USB MassStorage port is used in the trusted mode Step 4 Step 5 Step 6 Step 7 ...

Page 25: ...the message Image Download Failed Cookie if present not received will be displayed during restart In these cases you may repeat the preceding steps If the download fails restart the MediaPad and connect it to the PC to check whether the upgrade is conducted in the trusted mode using the QPST software that is the Qualcomm MMC Storage USB Device is displayed Then perform the upgrade using the USB ac...

Page 26: ...pgrade in the trusted mode Then uncheck Program Boot Loaders as shown in the following figure Click Scan Download if the message port open is displayed check whether the driver is properly installed and whether DBAdapter Reserved Interface port functions well 5 4 Viewing the Software Version In the standby state choose Settings About phone to view the information about the software version 6 Maint...

Page 27: ...constant temperature hot air gun Purpose heat components Name soldering iron Purpose soldering during maintenance Name DC power Purpose supply power Name soldering Purpose secure the main board Name lead free solder wire Purpose soldering Name digital multimeter Purpose measurement during maintenance Name tool kit Purpose assemble and disassemble the device ...

Page 28: ...ectric screwdriver Purpose fasten and remove screws Name small sucker diameter about 25 mm Purpose remove the upper decorative cover 7 Disassembly Procedures 1 Ensure that the ESD wrist strap is properly grounded 2 Disassembly procedures are as shown below 3 Remove the lower decorative cover with the sucker 4 Remove the upper decorative cover with the sucker ...

Page 29: ... and Confidential Copyright Huawei Technologies Co Ltd Page 29 of 97 5 Remove the six screws on the rear cover 6 Unlock the rear cover 7 Disassemble the rear cover 8 Loosen the BTB connector of the battery 9 Take out the glued battery 10 Loosen the BTB connector marked in the picture ...

Page 30: ...Confidential Copyright Huawei Technologies Co Ltd Page 30 of 97 11 Remove the 5 megapixel camera 12 Loosen the BTB connector of the headset 13 Remove the JACK FPC of the headset 14 Remove the screws marked in the picture 15 Remove the connector of the headset 16 Remove the auxiliary board ...

Page 31: ...awei Technologies Co Ltd Page 31 of 97 17 Remove the three screws on the main board 18 Remove the conductive fabric between the main board and the LCD support 19 Remove the main board 20 Remove the FPCs marked in the picture 21 Remove the seven screws securing the LCD 22 Remove the LCD from other cover A assembly ...

Page 32: ...ei Proprietary and Confidential Copyright Huawei Technologies Co Ltd Page 32 of 97 23 Place the protective film on the LCD 24 Place the protective film on the lens 25 Remove the speaker on the rear cover 26 Remove the vibrator on the rear cover 27 Remove the front camera ...

Page 33: ...echnologies Co Ltd Page 33 of 97 8 Assembly Procedures 1 Ensure that the ESD wrist strap is properly grounded 2 Remove the protective film on the lens 3 Remove the protective film on the LCD 4 Install the LCD 5 Tighten the screws marked in the picture to secure the LCD 6 Place FPCs at the positions marked in the picture ...

Page 34: ...wei Technologies Co Ltd Page 34 of 97 7 Install the front camera to the main board 8 Install the main board 9 Place the conductive fabric at the position marked in the picture 10 Tighten the screws marked in the picture to secure the main board 11 Install the auxiliary board 12 Install the connector of the headset ...

Page 35: ...ntial Copyright Huawei Technologies Co Ltd Page 35 of 97 13 Tighten the screws marked in the picture 14 Install the FPC for the connector of the headset 15 Secure the BTB connector of the headset 16 Install the rear camera 17 Secure the BTB connectors marked in the picture 18 Install the battery ...

Page 36: ...ntial Copyright Huawei Technologies Co Ltd Page 36 of 97 19 Secure the connector of the battery 20 Install the vibrator 21 Install the speakers Note The springs of them must face each other 22 Install the rear cover 23 Secure the front cover and rear cover 24 Tighten the screws on the rear cover ...

Page 37: ...entertainment and communication services to home and mobile users The S7 Pro uses a single board to control the device and process the graph image and baseband signal The key components of Mediapad include processor MSM8260 RF transceiver QTR8615 PMU PM8058 and PM8901 power management IC MAX8903 WLAN BT module BCM4329 and RGB to LVDS 8 bit transceiver The MSM8260 is Qualcomm s new generation proce...

Page 38: ... 1440 x 900 supports up to three displays Primary 4 lane MIPI_DSI up to 24 bit WSXGA 1440 x 900 refresh rate up to 60 Hz Secondary RGB interface up to WSXGA 1440 x 900 refresh rate up to 60 Hz Tertiary EBI2 interface up to 400 x 240 non active refresh Color depth 24 bits per pixel bpp Audio video A V output Composite video plus line audio for NTSC PAL TVs S video plus line audio for NTSC PAL TVs H...

Page 39: ...Co Ltd Page 39 of 97 Secure digital interfaces up to five ports MMC and SD cards eMMC NAND flash UBM and WLAN and SD eMMC boot I2S interfaces up to 18 multiple I2S channels over five interfaces PCM for Bluetooth TSIF up to two ports NFC with external NFC device The MSM8260 functional block diagram is shown in the following figures ...

Page 40: ...wer the PRO on 1 Press and hold the Power button for two seconds with the battery in place 2 Connect the 5 V DC regulated power supply to the DC power interface with the battery in place The device is powered on and charging begins 3 Connect the 5 V DC regulated power supply to the DC power interface with the battery not in place The device is powered on and starts to run Connect the DC adapter to...

Page 41: ...S7 PRO Maintenance Manual Basic Version V2 1 INTERNAL 2012 07 20 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd Page 41 of 97 Power_key circuit ...

Page 42: ...1 1 1 V Scorpion core 1 optional NOTE 1 The core voltage VDD_C1 needs to be powered up before the pad circuits VDD_PX are powered up so that internal circuits can take control of the I Os and pads 2 If pad voltages are powered up first the output drivers may be stuck in unknown states and may cause high leakage current until VDD_C1 is powered on 3 The pad voltages must precede the analog voltages ...

Page 43: ...td Page 43 of 97 NOTE VDD_QFUSE_PRG must be powered down before any of the pad power supplies are powered down NOTE The VDD_QFUSE_PRG pin should be connected to a 1 8 V power supply only for blowing fuses otherwise this pin must be grounded and never be left floating The kernel system power on waveform is shown in the following figure ...

Page 44: ...S7 PRO Maintenance Manual Basic Version V2 1 INTERNAL 2012 07 20 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd Page 44 of 97 Voltage ...

Page 45: ...V 1 500 to 3 3 V 1 500 to 3 3 V 1 500 to 3 3 V 1 000 to 1 400 V 1 000 to 1 400 V DDR2 core EBI1 HSIC digital I Os Digital pads Tx DAC XO digital outputs SDIO Analog and RF circuits S video combo DAC Analog baseband circuits S video DAC UBM analog MDDI NCP WLAN PA RF front end circuits LCD Multimedia controls General purpose General purpose Linear 150 mA L0 NMOS L3 PMOS L11 PMOS L12 PMOS L17 PMOS L...

Page 46: ...ogies Co Ltd Page 46 of 97 Type Name Default Conditions Programmable Range Operating Range Intended Use Low voltage Switches LVS0 100 mA LVS1 100 mA Off 1 800 V Off 1 800 V Not applicable Not applicable Not applicable Not applicable Camera Sensors HDMI NCP 200 mA Off 1 800 V 1 700 to 1 900 V 1 700 to 1 900 V Headset circuits ...

Page 47: ...9 2 1 Power on Failure High Current Analysis Adjust the DC regulated power supply to 5 V 3 A and connect it to the PRO_DC interface for power on When the device is powered on the current exceeds 500 mA In this case the power on failure is usually caused by improper SMT or IC damage For the maintenance procedures see Figure 9 1 Figure 9 2 and Figure 9 3 ...

Page 48: ...es Co Ltd Page 48 of 97 Power on fails due to high current Switch off the power and check whether short circuit occurs in C665 and C624 Check whether short circuit occurs in the C418 C419 C420 C423 C424 Check whether short circuit occurs in C442 C435 C444 and C445 Replace U2 Yes No No No Replace U48 Replace U7 Replace U2 Yes Yes ...

Page 49: ...S7 PRO Maintenance Manual Basic Version V2 1 INTERNAL 2012 07 20 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd Page 49 of 97 Figure 9 1 ...

Page 50: ...ure 9 3 9 2 2 Power on Failure Low Current Analysis Adjust the DC regulated power supply to 5 V 3 A and connect it to the PRO_DC interface for power on When the device is powered on the current is below 70 mA In this case the power on failure is usually caused by improper eMMC programming or SMT For the maintenance procedures see Figure 9 1 Figure 9 2 and Figure 9 3 ...

Page 51: ...ifference between C418 and C419 is 1 8 V Perform eMMC programming again U12 No Yes Yes Replace U48 Replace U7 No 9 3 Charge Failure The Mediapad charging management circuits are shown in the following figure Principle The DC regulated power supply provides the 5 V 3 A power supply to the DC DC circuits in the MAX8903 and MAX8903 and the power is output through VBAT and VPH_PWR respectively Analysi...

Page 52: ...ge difference and check for improper SMT Solder R4 No Yes Yes Replace D3 D20 C747 C486 and C108 Replace U48 No 9 4 Failure to Identify SIM Card Diagram of the circuits The SIM_CD indicates the PIN of the SIM card and is used for identifying the SIM card When the SIM card is inserted the voltage of SIM_CD changes from a high level to a low level Remark For the maintenance procedures see Appendix 1 ...

Page 53: ...ght Huawei Technologies Co Ltd Page 53 of 97 SIM card identification fails Check whether the device enters the airplane mode when it is powered on Check whether the voltage of C591 ranges from 1 8 V to 3 3 V Perform the eMMC programming again U12 Yes No No Set the device to non airplane mode Replace Z12 Yes ...

Page 54: ...PRO Maintenance Manual Basic Version V2 1 INTERNAL 2012 07 20 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd Page 54 of 97 9 5 Failure to Identify SD Card Diagram of the circuits ...

Page 55: ...echnologies Co Ltd Page 55 of 97 The SDC3_CARA_CD indicates PIN of the SD card and is used for identifying the SD card When the SD card is inserted the voltage of SDC3_CARA_CD changes from a high level to a low level The MSM8260 determines that the SD card is available Then call the SD card driver to access the SD card ...

Page 56: ...S7 PRO Maintenance Manual Basic Version V2 1 INTERNAL 2012 07 20 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd Page 56 of 97 ...

Page 57: ...ls Check whether the voltage of C514 on the main board PCB is 2 85 V Check whether the voltage of R4 on the auxiliary board is 2 85 V Repair the auxiliary board No Yes Yes Replace U7 Replace the FPC connecting the main board PCB and auxiliary board PCB No Check whether short circuit to ground occurs in R10 R9 R12 R13 and R8 on the auxiliary PCB Yes Replace the SD card socket No ...

Page 58: ...ntenance Manual Basic Version V2 1 INTERNAL 2012 07 20 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd Page 58 of 97 9 6 Display Failure LCD driver circuits LCD backlight driver circuits ...

Page 59: ...nputs to connect directly to low power low voltage application and graphic processors Transfer rate up to 135 Mpps mega pixel per second pixel clock frequency range 10 MHz to 135 MHz Operates from a single 3 3 V supply and 170 mW typ at 75 MHz 28 data channels plus clock in low voltage TTL to 4 data channels plus clock out low voltage differential Consumes less than 1 mW when disabled The block di...

Page 60: ...place U40 Replace the LCD Remark 2 The backlight cannot be turned on See the following chart for maintenance procedures Display failure occurs the backlight cannot be turned on Check whether short circuit occurs in U1 Check whether short circuit occurs in Q22 Yes No No Replace U1 Replace Q22 Yes Check whether J9 shows any insufficient or staggered soldering No Repair J9 Yes Replace the LCD 9 7 Tou...

Page 61: ...s the touchscreen driver through the I2C port See the following chart for maintenance procedures Touchscreen failure occurs Check whether short circuit occurs in U1000 Check whether short circuit occurs in U35 Yes No No Replace U1000 Replace U35 Yes Check whether short circuit occurs in U19 No Replace U19 Yes Replace the TP touchscreen 9 8 Audio Failure 9 8 1 Speaker Failure Diagram of circuits ...

Page 62: ...e of no sound from the speaker check for sound output after the S7 Pro is connected to the TV through the HDMI If there is sound repair the device according to the following chart Speaker failure occurs Check whether short circuit occurs in U14 and U15 Check whether short circuit occurs in SKP Yes No No Replace U14 and U15 Replace the SPK Yes Replace the SPK FPC ...

Page 63: ...et Failure Diagram of circuits Upon a headset failure check whether the headset interface is properly assembled If the problem persists replace the headset jack 9 9 Camera Failure Diagram of circuits The S7 Pro camera transmits signals through the MIPI The red part indicates the power supply circuit of the camera See the following chart for maintenance procedures ...

Page 64: ...ailure occurs Check whether the voltage of C246 and C247 is 1 8 V and whether the voltage of C248 and 249 is 2 8 V Visually check for any improper SMT in J2 and J6 No Yes Yes Replace U7 Repair J2 and J6 No Replace the camera 9 10 Vibration Failure Diagram of circuits Principle The motor controls the vibration based on the differential pressure of the input PIN ...

Page 65: ...AL 2012 07 20 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd Page 65 of 97 Vibration failure occurs The motor becomes faulty No Yes Replace the motor PFC Replace the motor 9 11 RF Failure Figure 9 4 Block diagram of QTR8615 RF ...

Page 66: ...ule and transmitted by the antenna to QTR8615 After the signal is amplified in the internal LNA it is down converted to I Q baseband signal The device supports WCDMA that uses the frequency band of 5 MHz and GSM that uses the frequency band of 4 MHz Figure 9 5 Diagram of circuits of the RF antenna switch The red part indicates that the signal is transmitted into the antenna switch U46 through the ...

Page 67: ...lue part indicates the receive channel Both the transmit channel and the receive channel are connected to the antenna switch through the duplexer U41 Figure 9 8 Diagram of circuits of WCDMAAWS RF channels The red part indicates the transmit channel and the blue part indicates the receive channel Both the transmit channel and the receive channel are connected to the antenna switch through the duple...

Page 68: ...ceive channel are connected to the antenna switch through the duplexer U21 Figure 9 10 Diagram of circuits of WCDMA900 RF channels The red part indicates the transmit channel and the blue part indicates the receive channel Both the transmit channel and the receive channel are connected to the antenna switch through the duplexer U32 Figure 9 11 Diagram of circuits of GSM transmit channels The green...

Page 69: ...whether QTR8615 can output the signal TX_IMT normally Check whether the power supply for QTR8615 U23 is normal Check whether the power output of the power amplifier U22 is within the specified range Check whether the duplexer U20 works normally Check whether the antenna switch U46 works normally Replace QTR8615 U23 Check the input signal output signal and power supply If any exception is found rep...

Page 70: ...ut the signal TX_PCS normally Check whether the power supply for QTR8615 U23 is normal Check whether the power output of the power amplifier U24 is within the specified range Check whether the duplexer U41 works normally Check whether the antenna switch U46 works normally Replace QTR8615 U23 Check the input signal output signal and power supply If any exception is found replace the power amplifier...

Page 71: ...the signal TX_PCS normally Check whether the power supply for QTR8615 U23 is normal Check whether the power output of the power amplifier U25 is within the specified range Check whether the duplexer U31 works normally Check whether the antenna switch U46 works normally Replace QTR8615 U23 Check the input signal output signal and power supply If any exception is found replace the power amplifier U2...

Page 72: ...t the signal TX_850 normally Check whether the power supply for QTR8615 U23 is normal Check whether the power output of the power amplifier U44 is within the specified range Check whether the duplexer U21 works normally Check whether the antenna switch U46 works normally Replace QTR8615 U23 Check the input signal output signal and power supply If any exception is found replace the power amplifier ...

Page 73: ...he signal TX_U900 normally Check whether the power supply for QTR8615 U23 is normal Check whether the power output of the power amplifier U29 is within the specified range Check whether the antenna switch U46 works normally Check whether the antenna switch U46 works normally Replace QTR8615 U23 Check the input signal output signal and power supply If any exception is found replace the power amplif...

Page 74: ...put signal and power supply If any exception is found replace the power amplifier U47 No Yes Y Check whether QTR8615 can output the signal TX_GSM_LB normally Check whether the 19 2 MHz crystal X1 is normal Check whether the TX_DCS1800_PCS19 power output of the power amplifier U47 is within the specified range No Yes No Power on the board Yes Check whether the antenna switch U46 works normally Chec...

Page 75: ...al output signal and power supply If any exception is found replace the power amplifier U47 No Yes Y Check whether QTR8615 can output the signal TX_GSM_LB normally Check whether the 19 2 MHz crystal X1 is normal Check whether the TX_GSM850_EGSM9 power output of the power amplifier U47 is within the specified range No Yes No Power on the board Yes Check whether the antenna switch U46 works normally...

Page 76: ...20 U41 U31 U21 and U32 Check the input signal output signal logic control signal and power supply If any exception is found replace U46 Check whether the antenna switch U46 and the WCDMA receive channel work normally No Y No Check the power supply for U23 If any exception is found replace U23 Check whether the input and output signals of duplexers U20 U41 U31 U21 and U32 are normal Power the board...

Page 77: ...the input signal output signal logic control signal and power supply If any exception is found replace U46 Check whether the antenna switch U46 and the GSM receive channel work normally No Y No Check the power supply for U23 If any exception is found replace U23 Check whether the input and output signals of duplexers U21 GSM850 are normal Power the board on End Yes Check whether QTR8615 U23 works ...

Page 78: ...wei Proprietary and Confidential Copyright Huawei Technologies Co Ltd Page 78 of 97 9 14 GPS Failure Figure 9 12 Diagram of GPS front end circuit The area in red indicates the SAW filter and LANchannel and the area in blue indicates the commonly used duplexer for Wi Fi ...

Page 79: ...22 pin 4 can receive the GPS signal normally Check whether Z18 pin 4 can receive the GPS signal normally Check whether the LNA U44 works normally Check whether Z5 pin 3 and pin 4 can receive the GPS signal normally Check whether QTR8615 U23 works normally Replace Z22 Check the input signal output signal logic control signal and power supply If any exception is found replace U44 Replace Z5 Check th...

Page 80: ...12 07 20 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd Page 80 of 97 9 15 Wi Fi BT Failure Figure 9 13 Diagram of circuits channel Use the 1P3T switch to choose the channel for Wi Fi and BT channel The Broadcom BCM4329 chip is used ...

Page 81: ... No Yes Y Check whether U43 pin 1 can output power signal normally Whether the 37 4 MHz crystal X4 is normal Check whether Z11 pin 1 can output power signal normally No Yes No Power on the board Yes Check whether Z18 pin 3 can output power signal normally Replace Z18 Maintenance procedures Yes Yes No Check the power supply for U11 If any exception is found replace U11 Check the power supply and co...

Page 82: ...wei Proprietary and Confidential Copyright Huawei Technologies Co Ltd Page 82 of 97 10 Diagram of Soldered Connections on PCB and BGA Chip 11 Function Test 11 1 MMI Test Run the Calculator application enter 2846579 and select Testing Click MMI Test to start the MMI test ...

Page 83: ... SD card test Test the Micro SD card If the Micro SD card is inserted the message SD card exists is displayed otherwise the message No SD card is displayed Click Success to proceed Step 2 SIM card test Test the SIM card If the SIM card is inserted the message SIM card exists is displayed otherwise the message No SIM card is displayed Click Success to proceed ...

Page 84: ... Ltd Page 84 of 97 Step 3 Keypad test Press a key If the keypad is functional the icon will turn gray Click Success to proceed Step 4 Gravity sensor test According to the icons on the screen tilt the device in different directions After a few seconds the symbol is displayed indicating that the test succeeded Click Success to proceed ...

Page 85: ...Huawei Technologies Co Ltd Page 85 of 97 Step 5 Touchscreen test Touch blue parts on the screen If the blue parts turn red the test succeeded Click Success to proceed Step 6 LCD test If the device displays white black black white strips and colorful strips in sequence the test succeeded Click Success to proceed ...

Page 86: ...S7 PRO Maintenance Manual Basic Version V2 1 INTERNAL 2012 07 20 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd Page 86 of 97 ...

Page 87: ...nual Basic Version V2 1 INTERNAL 2012 07 20 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd Page 87 of 97 Step 7 Number test The device will complete the test automatically Click Success to proceed ...

Page 88: ...onfidential Copyright Huawei Technologies Co Ltd Page 88 of 97 Step 8 LCD backlight test The device will complete the backlight test automatically Click Success to proceed Step 9 Speaker test If you can hear sound from the top and bottom speakers the test succeeded Click Success to proceed ...

Page 89: ...V2 1 INTERNAL 2012 07 20 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd Page 89 of 97 Step 10 Headset test Plug in or pull out the headset If the color of the icon changes the test succeeded Click Success to proceed ...

Page 90: ...of 97 Step 11 Camera test After the test is started the device displays the real scene to be captured by camera indicating that the test succeeded Click Success to proceed Step 12 Bluetooth test When nearby Bluetooth devices searched after the Bluetooth function is activated are displayed on the screen the test succeeded Click Success to proceed ...

Page 91: ...gies Co Ltd Page 91 of 97 Step 13 Wi Fi test When nearby Wi Fi signals found after the Wi Fi function is enabled are displayed on the screen the test succeeded Click Success to proceed Step 14 Headset speaker test If you can hear sound from both the left channel and the right channel the test succeeded Click Success to proceed ...

Page 92: ...Basic Version V2 1 INTERNAL 2012 07 20 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd Page 92 of 97 Step 15 Compass test The device will complete the compass test automatically Click Success to proceed ...

Page 93: ...12 07 20 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd Page 93 of 97 Step 16 Built in microphone test Switch between Record and Play The sound will enter into the microphone and travel out from the speaker Click Success to proceed ...

Page 94: ...y and Confidential Copyright Huawei Technologies Co Ltd Page 94 of 97 Step 17 Coulometer test The device will complete the coulometer test automatically Click Success to proceed Step 18 Motor test After the test is started the motor will vibrate automatically Click Success to proceed ...

Page 95: ...d Page 95 of 97 Step 19 USB HOST test The device will complete the USB HOST test automatically The message USB HOST test success is displayed when the test is completed Click Success to proceed Step 20 HDMI test The device will complete the HDMI test automatically If there is image and sound from the TV the test succeeded Click Success ...

Page 96: ...ial Copyright Huawei Technologies Co Ltd Page 96 of 97 Step 21 Displaying test results When all tests are completed the results are displayed on the screen Press the Home key to exit 11 2 Voice Call Test Step 1 Insert a functional SIM card and press and hold the Power button to power on the device ...

Page 97: ...right Huawei Technologies Co Ltd Page 97 of 97 Step 2 Check the signal strength after the device is connected to the local network You can compare it with a functional phone Step 3 Call a fixed line number to test the voice quality during the call Step 4 If no problem is found during the test end the test ...

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