Summary of Contents for Huawei MediaPad 7 Lite S7-931w
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Development Unit Reviewed by Date Technical support platform of the 2012-09-04 Product Development Unit Approved by Date Service representative platform of 2012-09-04 the Product Development Unit Huawei Technologies Co., Ltd. All rights reserved 2012-10-08 Huawei Confidential Page 1 of 82...
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MediaPad 7 Lite Maintenance Manual INTERNAL Change History Date Revision Version Change Reason Changed Section Change Author Description 2012-09-04 V1.0 2012-10-08 Huawei Confidential Page 2 of 82...
9 Troubleshooting for Common Failures .................. 35 9.1 Principle ................................. 35 9.2 Startup Failure ..............................37 9.2.1 Startup Failure Due to High Current ..................... 37 9.2.2 Startup Failure Due to Low Current ...................... 40 9.3 Charge Failure ..............................41 2012-10-08 Huawei Confidential Page 3 of 82...
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11 Function Tests ..........................63 11.1 Preparations ..............................63 11.2 Delivery Software (Customized Software) Entering the MMI Test Mode ........... 63 11.3 Production Software Entering the MMI Test Mode ..................64 11.4 MMI Test ..............................65 2012-10-08 Huawei Confidential Page 4 of 82...
MediaPad 7 Lite Maintenance Manual INTERNAL Product Overview 1.1 Appearance 1.2 Product Models MediaPad 7 Lite has multiple models. The following table describes the main functional differences of these models. 2012-10-08 Huawei Confidential Page 5 of 82...
2.1 Applicable Scope This document provides repair instructions for technicians at service centers authorized by Huawei. Being Huawei proprietary, this document is accessible only for authorized service centers and companies. Although every effort was made to ensure the accuracy of this...
ESD is the main cause of damage to electrostatic-sensitive components. Each ASC must exercise caution to avoid ESD damage and comply with the ESD protection requirements in this manual. 2.3 Obtaining Product and Maintenance Information To obtain product and maintenance information, visit Huawei website at: http://www.huaweidevice.com/cn/technicaIndex.do. 2012-10-08 Huawei Confidential...
Mechanical label antenna Protective glass of the network camera LCD tablet Decorating part of the rear coverl Rear cover assembly Battery Main control PCBA board LCD tablet POGOPIN Antenna Battery connector Headset socket tablet 2012-10-08 Huawei Confidential Page 10 of 82...
Supplying power for U9003 Converting RGB DDR3*4 the DDR3, with 1.5 the CPU, with 1.2 V the IO, with 1.8 V Output voltage: 3 V into LVDS V output voltage output voltage output voltage 2012-10-08 Huawei Confidential Page 11 of 82...
Ensure that the microSD card can be read and written. Obtain the upgrade package. Copy the dload directory to the microSD card. Ensure that the battery charge level is sufficient or charge the battery during the upgrade process. 2012-10-08 Huawei Confidential Page 16 of 82...
During the upgrade, the screen shown in the following figure is displayed. When the upgrade succeeds, the screen shown in the following figure is displayed. When the upgrade fails, the screen shown in the following figure is displayed. 2012-10-08 Huawei Confidential Page 17 of 82...
Failure 2 If a failure occurs at the beginning of the upgrade process, check whether the upgrade version is correct and whether MediaPad 7 Lite or microSD card is damaged. 2012-10-08 Huawei Confidential Page 18 of 82...
MediaPad 7 Lite to the USB port of the PC. If you install the driver for the first time, the window shown in the following figure is displayed. Choose to install the driver from the list or the specified position and click Next. 2012-10-08 Huawei Confidential Page 19 of 82...
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MediaPad 7 Lite Maintenance Manual INTERNAL Select the rockusb.sys file under the driver folder. 2012-10-08 Huawei Confidential Page 20 of 82...
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MediaPad 7 Lite Maintenance Manual INTERNAL Up to now, the driver of the USB device is installed. 2012-10-08 Huawei Confidential Page 21 of 82...
Insert MediaPad 7 Lite and enable it to enter the upgrade mode (as shown in the preceding main window). Select firmware. Ensure that MediaPad 7 Lite is in the Rockusb state (Maskrom or Loader state). Upgrade or repair MediaPad 7 Lite. 2012-10-08 Huawei Confidential Page 22 of 82...
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Perform batch upgrade on the hub. A maximum of four pieces of MediaPad 7 Lite can be upgraded at the same time. Restart the batch upgrade program after modifying the configuration file. Do not start other upgrade programs when running RKBatchTool.exe. 2012-10-08 Huawei Confidential Page 23 of 82...
PCBA Name: lead-free solder wire Usage: for soldering Name: digital multimeter Usage: to measure during repair Name: toolkit Usage: to assemble and disassemble components Name: electric screwdriver Usage: to fasten and remove screws 2012-10-08 Huawei Confidential Page 24 of 82...
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MediaPad 7 Lite Maintenance Manual INTERNAL Name: guitar pick Usage: to disassemble MediaPad 7 Lite Name: air suction ball Usage: to disassemble MediaPad 7 Lite 2012-10-08 Huawei Confidential Page 25 of 82...
Small-sized Phillips screwdriver, used to disassemble the external three screws Small-sized hexagon screwdriver, used to disassemble the internal screws Ensure that the ESD wrist strap is well grounded. Disassemble MediaPad 7 Lite, as shown in the following figure. 2012-10-08 Huawei Confidential Page 26 of 82...
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(Note that the gap is narrow). Insert the pick along the direction indicated by the yellow arrow. You can also use an air suction ball to open the decorative cap. 2012-10-08 Huawei Confidential Page 27 of 82...
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2. Use the guitar pick to separate the decorating part from the rear cover. 3. Disassemble the decorative cap and rear cover. MediaPad 7 Lite Decorative cap Remove screws. 2012-10-08 Huawei Confidential Page 28 of 82...
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Dust-proof cover of the SD card holder Open the front cover. 2012-10-08 Huawei Confidential Page 29 of 82...
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6. Open the rear cover SIM card holder are at the from the longer edge other longer edge. without the microSD and SIM card holders. Rear cover of MediaPad 7 Lite Disassemble the internal assembly. 2012-10-08 Huawei Confidential Page 30 of 82...
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PCBA. Disassemble the LCD flexible printed circuit (FPC) and touchscreen FPC. 8. Disassemble the LCD FPC and touchscreen FPC. Disassemble the FPCs of the power and volume keys. 2012-10-08 Huawei Confidential Page 31 of 82...
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10. Disassemble the 10 self- tapping screws used for fastening PCBA , headset, speaker, and battery. 11. Remove the headset jack, front network camera, and rear network camera from the PCBA. 2012-10-08 Huawei Confidential Page 32 of 82...
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MediaPad 7 Lite Maintenance Manual INTERNAL Front network camera Headsets jack Rear network camera The following figure shows the disassembled audio box. Audio box Speaker monomer 2012-10-08 Huawei Confidential Page 33 of 82...
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MediaPad 7 Lite Maintenance Manual INTERNAL 3G main antenna The following figure shows the disassembled PCBA. Top side of the PCBA of MeidaPad 7 Lite Bottom side of the PCBA 2012-10-08 Huawei Confidential Page 34 of 82...
RK2918 chip as the kernel and integrates third-party peripherals such as HDMI, codec, Wi-Fi/Bluetooth, GPS, camera, G-sensor, memory, and 3G. The RK2918 is an MID solution featuring the compatibility with Android 4.0 and Adobe Flash Player 10.1, rich functions and powerful performance. 2012-10-08 Huawei Confidential Page 35 of 82...
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L2 256 KB Storage space 1 GB DRAM + 4 GB NAND Flash Four 256 Mbit DDR3s 1 HS-USB Electromagnetic Compliant with Huawei internal compatibility specification DKBA 1620-2007.5 Environment protection Lead-free, meeting RoHS PCBA and FPCs of MediaPad 7 Lite...
Adjust the voltage of the DC regulated power supply to 5 V/3 A. Use the DC regulated power supply to power the LITE_USB interface. The current exceeds 500 mA after MediaPad 7 Lite is powered on. This usually occurs when the IC patch is abnormal or damaged. 2012-10-08 Huawei Confidential Page 37 of 82...
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U9000/U9001/U9002/U9003 U9003 is short is normal. circuited. Check whether Check whether the the U1001/ output voltage of the U1001/U1000/U1002 is normal. U1000/U1002 is short circuited. Replace the U4. 2012-10-08 Huawei Confidential Page 38 of 82...
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U9000 is 1.8 V. The U9002 is used to power the CPU and its output voltage is 1.2 V. The U9001 is used to power four DDR3s and its output voltage is 1.5 V. 2012-10-08 Huawei Confidential Page 39 of 82...
C1822/C1823 is 3.7 V. Check the Check whether circuits related the output voltage of the U9000/U9001/U9002/U9003 to the U9000/ is normal. U9001/U9002/ U9003. Replace the U1800. The following figure shows the principles of the coulometer. 2012-10-08 Huawei Confidential Page 40 of 82...
9.3 Charge Failure The following figure shows the charge principles. The charge function of MediaPad 7 Lite is controlled by the U1801. For the solution, see Figure 9-2 (component layout of MediaPad 7 Lite). 2012-10-08 Huawei Confidential Page 41 of 82...
9.4 Failure to Identify the SIM Card The following figure shows the principles of the SIM card. The SIM card cannot be identified. For the solution, see Figure 9-2 (component layout of MediaPad 7 Lite). 2012-10-08 Huawei Confidential Page 42 of 82...
C1500 ranges Replace the U2401. from 1.8 V to 3.3 V. Re-load the U1302. 9.5 Failure to Identify the MicroSD Card The following figure shows the principles of the microSD card. 2012-10-08 Huawei Confidential Page 43 of 82...
U9003. PCBA is 3 V. Check Replace the whether the U1500 is U1500. short circuited. Check whether the Replace the R1513/R1512/R1509/R2017/R1508/R1511/R1520 microSD card is short to ground. holder. 9.6 Display Failure 2012-10-08 Huawei Confidential Page 44 of 82...
U1301 is short circuited. Replace the LCD monomer and LCD FPC. 9.6.1 Display Failure The following figure shows the voltage principles of the backlight. The backlight cannot be illuminated. For the solution, see the following flowchart. 2012-10-08 Huawei Confidential Page 45 of 82...
Check whether the Q1303. Q1303 is short circuited. Check whether Repair the the J1300 is poorly soldered or is J1300. incorrectly connected. Replace the LCD monomer. 9.7 Touchscreen Failure The following figure shows the principles. 2012-10-08 Huawei Confidential Page 46 of 82...
Check whether the Check whether output voltage of the the output voltage of the U9000 is normal. C1326 is 1.8 V. Replace the TP (touchscreen). 9.8 Speaker Failure The following figure shows the principles. 2012-10-08 Huawei Confidential Page 47 of 82...
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Speaker failure Check Replace the whether the U1700 is U1700. short circuited. Check Replace the SPK whether the resistance of the SKP monomer. monomer is 8 ohm. Replace the SPK FPC. 2012-10-08 Huawei Confidential Page 48 of 82...
C1201 is 2.8 V. U1200 is 2.8 V. Visually check Repair the J1200/ whether an SMT soldering exception occurs on J1102. the J1200/J1102. Replace the network camera. 2012-10-08 Huawei Confidential Page 49 of 82...
Connect the R60001 to the CPU and use the multimeter to measure whether the impedance is normal. Measure whether the voltage is 3 V at both ends of the motor. If yes, replace the motor. The following figure shows the circuits of the motor. 2012-10-08 Huawei Confidential Page 50 of 82...
Check whether Replace the the U2100, C2110, L2101, L2102, C2103, corresponding part. and L2100 have SMT defects or quality problems. Check whether Replace the J2100. the U2101 has SMT defects or quality problems. 2012-10-08 Huawei Confidential Page 51 of 82...
U2100, C2115, and C2104 have SMT corresponding part. defects or quality problems. Check whether Replace the the U2101 has SMT defects or U2101. quality problems. The following figure shows the Wi-Fi/Bluetooth principles. 2012-10-08 Huawei Confidential Page 52 of 82...
GPS/GLONASS signal received by the GPS antenna is filtered and then amplified by the LNA. The SAW then sends the amplified signal to the BCM47511 chip for processing. The following figure shows the principles of GPS reception. 2012-10-08 Huawei Confidential Page 53 of 82...
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C2311, and L2301 have SMT defects or quality problems. Check whether Replace the the U2300 has SMT defects or TCXO2300. quality problems. The following figure shows the GPS and Wi-Fi/Bluetooth silkscreen. GPS circuits Wi-Fi/BT circuits 2012-10-08 Huawei Confidential Page 54 of 82...
MediaPad 7 Lite Maintenance Manual INTERNAL 9.15 Position of the SH1931UT in MediaPad 7 Lite Nand MU509 flash 模 块 Connector of the 3G area rear network camera Connector of the front network camera Audio PA 2012-10-08 Huawei Confidential Page 55 of 82...
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MediaPad 7 Lite Maintenance Manual INTERNAL Top side MU509 area GPS area Wi-Fi area Top side Nand Flash area 2012-10-08 Huawei Confidential Page 56 of 82...
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MediaPad 7 Lite Maintenance Manual INTERNAL Nand Flash area CPU area 2012-10-08 Huawei Confidential Page 57 of 82...
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MediaPad 7 Lite Maintenance Manual INTERNAL CPU area Areas for 4 DDR3s Position of the SH1931UT (on the bottom side) Bottom side Overall schematic drawing 2012-10-08 Huawei Confidential Page 58 of 82...
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MediaPad 7 Lite Maintenance Manual INTERNAL Bottom side Bottom side 2012-10-08 Huawei Confidential Page 59 of 82...
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MediaPad 7 Lite Maintenance Manual INTERNAL MicroSD card holder SIM card holder Bottom side Bottom side 2012-10-08 Huawei Confidential Page 60 of 82...
Top side The red part indicates the null PIN, the green part indicates the ground, and the blue part indicates the signal solder point. 2012-10-08 Huawei Confidential Page 61 of 82...
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The red part indicates the null PIN, the green part indicates the ground, and the blue part indicates the signal solder point. Bottom side 2012-10-08 Huawei Confidential Page 62 of 82...
Prepare a USB OTG cable and a USB disk. Prepare an MHL cable (that is, MHL-to-HDMI cable). Only the 931WD supports the MHL function. 11.2 Delivery Software (Customized Software) Entering the MMI Test Mode 1. Tap the calculator icon. 2012-10-08 Huawei Confidential Page 63 of 82...
11.3 Production Software Entering the MMI Test Mode After MediaPad 7 Lite is normally powered on, the MMI Test icon is available in the main window. Tap this icon to access the MMI Test page. 2012-10-08 Huawei Confidential Page 64 of 82...
The meanings of test results are as follows: [Success]: The test item passes the test. [Fail]: The test item does not pass the test. As shown in the following figure, the Success and Fail buttons are available. 2012-10-08 Huawei Confidential Page 65 of 82...
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In an SIM card test, the system automatically detects the SIM card. If the SIM card is not detected, the message "NO SIM card available" is displayed, as shown in the following figure. If the SIM card is detected, the next test item is automatically executed. 2012-10-08 Huawei Confidential Page 66 of 82...
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Fifteen seconds later, a window listing the searched Bluetooth devices is displayed, and the next test item is executed. If no Bluetooth devices are available nearby, the system displays "No Bluetooth devices found. Search again?" To search for Bluetooth devices again, tap OK; otherwise, tap Cancel. 2012-10-08 Huawei Confidential Page 67 of 82...
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In a Wi-Fi test, the system first searches for Wi-Fi hot spots. The searched Wi-Fi hotspots are displayed on the screen. The program automatically checks whether the Wi-Fi test is successful. If the Wi-Fi test is successful, the program automatically executes the next test item. 2012-10-08 Huawei Confidential Page 68 of 82...
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If the test results on the X, Y, and Z axes are all about 45 degrees, the test is successful. Otherwise, the test failed. If the test is successful, the next test is executed. If the test failed, the current window is retained. 2012-10-08 Huawei Confidential Page 69 of 82...
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Before a USB host test, connect the transfer cable of the USB disk and insert the USB disk. If the test is successful, the system automatically executes the next test item. Otherwise, the current window is retained, displaying a test failure message. 2012-10-08 Huawei Confidential Page 70 of 82...
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Figure 11-4 Three keys displayed in blue, test succeeded Capacitive Touchscreen Test In a touchscreen test, tap and slide along the blue line. If the blue line becomes a red line, the test is successful. Otherwise, the test failed. 2012-10-08 Huawei Confidential Page 71 of 82...
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LCD Test In an LCD test, press Success in turn. Check whether bad spots (light and dark spots) exist on the displayed graphics. If no bad spots exist, select Success. Otherwise, select Fail. 2012-10-08 Huawei Confidential Page 72 of 82...
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LEAK Test In an LEAK test, the entire screen is black. Tap the screen. The result confirmation page is displayed. If the entire screen is black, the test is successful. Otherwise, the test failed. 2012-10-08 Huawei Confidential Page 73 of 82...
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In a front network camera test, the pictures taken by the front network camera are displayed on the screen. If the pictures are normally displayed, the test is successful. Otherwise, the test failed. 2012-10-08 Huawei Confidential Page 74 of 82...
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In a rear network camera test, the pictures taken by the rear network camera are displayed on the screen. If the pictures are normally displayed, the test is successful. Otherwise, the test failed. 2012-10-08 Huawei Confidential Page 75 of 82...
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In a recording test, tap Record on the screen. Three seconds later, tap Play to play the recorded audio. If the recorded audio is normal, the test is successful. Otherwise, the test failed. 2012-10-08 Huawei Confidential Page 76 of 82...
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In a headset recording test, insert the headset and tap Record to start recording. After the recording is finished, tap Play to play the recorded audio and check whether the recorded audio is normal. 2012-10-08 Huawei Confidential Page 77 of 82...
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If in, out, and the circle in the middle are displayed in blue, the test is successful and the next test item is executed. Otherwise, the test failed. 2012-10-08 Huawei Confidential Page 79 of 82...
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INTERNAL Motor Test In a motor test, MediaPad 7 Lite starts to vibrate. Place your hand on MediaPad 7 Lite. If you feel the vibration, the test is successful. Otherwise, the test failed. 2012-10-08 Huawei Confidential Page 80 of 82...
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HDMI is connected to the TV on MediaPad 7 Lite. Check whether the images and audio data output from the TV are normal. If yes, the test is successful. Otherwise, the test failed. 2012-10-08 Huawei Confidential Page 81 of 82...
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After all test items are finished, the failed test items are displayed. For 931WD, a button for entering the pedestal test is available in the upper right corner, as shown in the following figure. 2012-10-08 Huawei Confidential Page 82 of 82...