Huawei P20 Maintenance Manual
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Huawei P20 Maintenance Manual

Huawei P20 Maintenance Manual

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EML-L29V100R001 Advanced Maintenance
Prepared By:
Reviewed By:
Approved By:
Manual V2.0
Gao Haizhen (employee ID: 00371199)
Maintenance support
Service representatives
Huawei Technologies Co., Ltd.
All rights reserved
2018-01-19
Date:
Date:
Date:

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  • Page 1 EML-L29V100R001 Advanced Maintenance Manual V2.0 Gao Haizhen (employee ID: 00371199) 2018-01-19 Prepared By: Date: Maintenance support Reviewed By: Date: Service representatives Approved By: Date: Huawei Technologies Co., Ltd. All rights reserved...
  • Page 2 Released the first Gao Haizhen (employee version. ID: 00371199) Updated RF-related Gao Haizhen (employee 2018-02-27 V2.0 Chapter 4 contents. ID: 00371199) Gao Haizhen (employee 2018-02-27 V2.1 Updated flow chart Chapter 4 ID: 00371199) 2019-6-25 Huawei Confidential Page 2 of 67...

  • Page 3: Table Of Contents

    4.4 Touchscreen Failure ............................29 4.4.1 Maintenance Process ..........................29 4.4.2 Maintenance Principle........................... 30 4.5 Proximity/Ambient Light Sensor Failure ....................... 31 4.5.1 Maintenance Process ..........................31 4.5.2 Maintenance Principle........................... 32 4.6 Accelerometer Failure ............................ 33 2019-6-25 Huawei Confidential Page 3 of 67...
  • Page 4 4.17.2 Maintenance Principle (Transmission) ....................56 4.17.3 Maintenance Process (Reception) ....................... 57 4.17.4 Maintenance Principle (Reception) ..................... 58 4.18 RF Failure (GSM) ............................59 4.18.1 Maintenance Process (Transmission) ....................59 4.18.2 Maintenance Principle (Transmission) ....................60 2019-6-25 Huawei Confidential Page 4 of 67...
  • Page 5 4.18.3 Maintenance Process (Reception) ....................... 60 4.19 RF Failure (TDS/LTE) ..........................61 4.19.1 Maintenance Process (Transmission) ....................61 4.19.2 Maintenance Principle (Transmission) ....................62 4.19.3 Maintenance Process (Reception) ....................... 64 4.19.4 Maintenance Principle (Reception) ..................... 65 2019-6-25 Huawei Confidential Page 5 of 67...

  • Page 6: Product Introduction And Specifications

    EML-L29V100R001 Advanced Maintenance Manual V2.1 INTERNAL 1 Product Introduction and Specifications 1.1 Product Introduction The EML is a Huawei-developed, dual card (L+G/W) dual standby single active smartphone that supports voice services. It has the following features:  EMUI 8.0 (compatible with Android 8.0) ...
  • Page 7 *SIM card payment, and HCE payment); *SIM cards for SIM card payment can only be in slot SIM1. RAM: 4 GB/6 GB ROM: 128 GB/64 GB Audio effect: Huawei Histen Rear camera: 20 MP (monochrome)+12 MP (RGB), f/1.6 aperture, Leica lens Front camera: 24 MP, f/2.0 aperture, Leica lens...

  • Page 8: Working Principles And Materials

    Unit Function Octa-core processor, with support for function modules, such as SD 3.0, UART, SPI, SDIO, Baseband HI3670 Application unit I2C, I2S, PCM, HSI, HSIC, MIPI, DVP, GPIO, HDMI, USB, keypad, LPDDR4 controller, 2019-6-25 Huawei Confidential Page 8 of 67...
  • Page 9 Refers to the USB port peripheral circuit, Drive, protective protective circuit, and port connector in the USB port circuits, and output SOC and MHL subsystems. The USB port is a port components main data service channel for an engineering 2019-6-25 Huawei Confidential Page 9 of 67...
  • Page 10 Hall sensor GPIO control Senses protective cases. Power distribution This unit includes filtering networks and cables Power network for the power supply. distribution network and Backup battery PMIC charges the capacitor for maintaining the 2019-6-25 Huawei Confidential Page 10 of 67...

  • Page 11: Pcba Components And Bom Information

    The following is the PCBA component document. PC B A C o m p o nents i n  EM L-L29V 100R 001  A d vanced M ai ntenance M anual _V 2. 0-20180227. xl sx 2019-6-25 Huawei Confidential Page 11 of 67...

  • Page 12: Faulty Component Description

    DDR and SOC are bound together. Various stability faults may occur. For Only if you are U300_POP example, the phone cannot be powered sure that DDR is on, restarts repeatedly, or freezes. defective, replace DDR. 2019-6-25 Huawei Confidential Page 12 of 67...
  • Page 13 U1901 Flash drive chip The flash cannot be turned on. There are issues, such as temperature U1902 RGB sensor sensor failure and image color cast. Rear camera J2001 The rear camera malfunctions. connector 2019-6-25 Huawei Confidential Page 13 of 67...
  • Page 14 SIM cards cannot be detected. tray not supported. The phone cannot be charged, the Check the Main FPC J2901 speaker fails, the motor fails, the connection of connector microphone fails, smart cover mode, fastened points or 2019-6-25 Huawei Confidential Page 14 of 67...

  • Page 15: Software Maintenance Guide

    Run the NFF detection tool compartner.exe. The automatic detection starts. If the detection result is locked, the phone has not been rooted. If the detection result is unlocked, the phone has been rooted. 2019-6-25 Huawei Confidential Page 15 of 67...

  • Page 16: Adb Mode Detection (Only For Phones That Can Properly Start)

    The phone carries out the MMI test (you can skip this test by automatic detection starts. following the on-screen instructions) before the root test. The method for displaying test results is the same as that for displaying test results in fastboot mode. 2019-6-25 Huawei Confidential Page 16 of 67...

  • Page 17: Software Update Guide

    After a phone is rooted, use the fastboot tool to erase all data. Then, update the board software again. Step 1. Run the Fastboot Erase Tool. Click the button marked as 1 next to Configure file, and enter the password huawei. Select the required .xml file from the MHA factory-level software package. 2019-6-25...
  • Page 18 Step 4. After the flash memory is totally erased, the phone displays a black screen and cannot be powered on. The port is displayed below. Download the USB driver for the production line, and select VCOM to After the driver is updated, the HUAWEI USB COM 1.0 port is displayed in update the phone.

  • Page 19: Updating An Unrooted Phone

    The following table describes the cable to update the phone in forcible loading mode. update procedure. Update Using the USB Cable 1. Press and hold the power button for 10s until the phone is powered off. 2019-6-25 Huawei Confidential Page 19 of 67...

  • Page 20: Software Log Tool

    On the dialer screen, enter *#*#2846579#*#* to enter the engineering mode. Choose Project Menu > Background Settings > DumpLog. Enable the log switch by selecting the related option. Use the log tool to capture logs and send them to software developers. 2019-6-25 Huawei Confidential Page 20 of 67...
  • Page 21 Device Manager on the computer. Place the attached log tool in a directory on the computer, such as: E:\logs. Click the script to capture logs. Access the directory and check whether logs are captured. 2019-6-25 Huawei Confidential Page 21 of 67...

  • Page 22: Troubleshooting

    VCHG_USB_CONN is 5 V. Is a direct charger Do I2C6_SCL Replace U1602 used? and I2C6_SDA have signals? Replace U2101 Check whether U1602 and U300 are soldered properly. If no, re-solder them. If yes, replace the chips 2019-6-25 Huawei Confidential Page 22 of 67...

  • Page 23: Maintenance Principle

    EML-L29V100R001 Advanced Maintenance Manual V2.1 INTERNAL 4.1.2 Maintenance Principle Figure 4-2 Charging failure maintenance principle 1 Figure 4-3 Charging failure maintenance principle 2 2019-6-25 Huawei Confidential Page 23 of 67...
  • Page 24 TP3 (no actual test point; you can test the I2C6_SCL A waveform is available after pull-up resistor) charging is enabled. TP4 (no actual test point; you can test the I2C6_SDA A waveform is available pull-up resistor) after charging is enabled. 2019-6-25 Huawei Confidential Page 24 of 67...

  • Page 25: Sim Card Detection Failure

    Check the Fail of the SIM card main chip using an X-ray Replace the main chip holder machine Pass Test the time sequence Pass Pass Software is faulty. Try formatting the phone 2019-6-25 Huawei Confidential Page 25 of 67...

  • Page 26: Maintenance Reference Networks

    Low level, 0 V SIM0_VCC 1.8 V or 3 V USIM0_CLK 3.75 MHz Valid at low level USIM0_RST Fluctuant USIM0_DATA 1.8 V or 3 V SIM1_VCC USIM1_CLK 3.75 MHz USIM1_RST Valid at low level USIM1_DATA Fluctuant 2019-6-25 Huawei Confidential Page 26 of 67...

  • Page 27: Lcd Failure

    If there are no soldering RST PWM TE signal issues, replace defective normal (R1723、 components R1724、R1721)? Is the If there are no soldering MIPI signal normal issues, replace defective (T1701~T1705)? components Replace U300 2019-6-25 Huawei Confidential Page 27 of 67...

  • Page 28: Maintenance Principle

    EML-L29V100R001 Advanced Maintenance Manual V2.1 INTERNAL 4.3.2 Maintenance Principle 2019-6-25 Huawei Confidential Page 28 of 67...

  • Page 29: Touchscreen Failure

    Are the Are components on the pull-up resistor and circuit normal? components on the circuit normal? If there are no soldering issues, replace U300 If there are no soldering issues, replace defective components 2019-6-25 Huawei Confidential Page 29 of 67...

  • Page 30: Maintenance Principle

    EML-L29V100R001 Advanced Maintenance Manual V2.1 INTERNAL 4.4.2 Maintenance Principle 2019-6-25 Huawei Confidential Page 30 of 67...

  • Page 31: Proximity/Ambient Light Sensor Failure

    Perform cross Replace the front verification. Is the PCBA cover assembly normal? Are power VOUT18(C2901) and Replace U1000 VOUT24(C2902) normal? Check whether components on the I2C0 (C2903, C2904) circuit are defective 2019-6-25 Huawei Confidential Page 31 of 67...

  • Page 32: Maintenance Principle

    EML-L29V100R001 Advanced Maintenance Manual V2.1 INTERNAL 4.5.2 Maintenance Principle 2019-6-25 Huawei Confidential Page 32 of 67...

  • Page 33: Accelerometer Failure

    Replace U2602 Is the sensor power supply normal? If there are no soldering issues, replace U1000 Is the I2C0 signal normal? If there are no Replace the faulty soldering issues, sensor replace U300 2019-6-25 Huawei Confidential Page 33 of 67...

  • Page 34: Maintenance Principle

    EML-L29V100R001 Advanced Maintenance Manual V2.1 INTERNAL 4.6.2 Maintenance Principle 2019-6-25 Huawei Confidential Page 34 of 67...

  • Page 35: Compass Failure

    Is the I2C0 signal normal (J2901)? If there are no Replace the faulty soldering issues, sensor replace U300 Because all sensor I2Cs are mounted to the I2C0 circuit, choose a proper network for the test. 2019-6-25 Huawei Confidential Page 35 of 67...

  • Page 36: Maintenance Principle

    EML-L29V100R001 Advanced Maintenance Manual V2.1 INTERNAL 4.7.2 Maintenance Principle U2604 instead of U2601is installed. A pad is shared. Sensor I2C addresses Sensor I2C Address Proximity sensor/Ambient light sensor 0x39 Accelerometer/Gyroscope 0x6B and 0x6A Compass 0x0C 2019-6-25 Huawei Confidential Page 36 of 67...

  • Page 37: Hall Sensor Failure

    Perform cross verification. Is the PCBA faulty Is the power supply of Replace U1000 sensor_1v8 normal? Measure the interrupt signal of the fourth pin of U200 (on Replace the SOC (U300) the sub-board) 4.8.2 Maintenance Principle 2019-6-25 Huawei Confidential Page 37 of 67...

  • Page 38: Motor Failure

    Pass Is the voltage at both ends of the motor 1.8 V? Fail If there are no soldering issues, replace U2301 2019-6-25 Huawei Confidential Page 38 of 67...

  • Page 39: Maintenance Principle

    EML-L29V100R001 Advanced Maintenance Manual V2.1 INTERNAL 4.9.2 Maintenance Principle 2019-6-25 Huawei Confidential Page 39 of 67...

  • Page 40: Receiver Failure

    Use an X-ray machine for the check. Do L2502 and L2503 have soldering issues? It is suspected that Ask PCBA process Codec U2201 is engineers to faulty. Replace U2201 analyze the cause 2019-6-25 Huawei Confidential Page 40 of 67...

  • Page 41: Maintenance Principle

    EML-L29V100R001 Advanced Maintenance Manual V2.1 INTERNAL 4.10.2 Maintenance Principle Test Point Network Normal Standard L2501 RCV_TEST_P Same as the resistance of a normal board Same as the resistance of a normal L2502 RCV_TEST_N board 2019-6-25 Huawei Confidential Page 41 of 67...

  • Page 42: Speaker Failure

    4.11.2 Maintenance Principle Test Point Network Normal Standard TP3021 SPKOUT_ P Same as the resistance of a normal board TP3022 SPKOUT_ N Same as the resistance of a normal board 2019-6-25 Huawei Confidential Page 42 of 67...

  • Page 43: Microphone Failure

    The microphone is faulty. Send it to the manufacturer for Is the analysis A_MICBIAS2 voltage normal (C2321)? Check L2303, L2304, C2325, and C2326 in sequence If there are no soldering issues, replace U2201 2019-6-25 Huawei Confidential Page 43 of 67...

  • Page 44: Maintenance Principle

    EML-L29V100R001 Advanced Maintenance Manual V2.1 INTERNAL 4.12.2 Maintenance Principle 2019-6-25 Huawei Confidential Page 44 of 67...

  • Page 45: Headset Failure

    HS_MIC_TEST, and HS_GND_TEST in sequence. Is the Replace the resistance of the networks corresponding resistor normal? or capacitor. Is the DP HD Replace U2201 video normal? Is the USB device normal? Replace U2102. Replace U2101 2019-6-25 Huawei Confidential Page 45 of 67...

  • Page 46: Maintenance Principle

    Same as the resistance of a normal board LB2403 HSR__TEST Same as the resistance of a normal board LB2401 HS_MIC_TEST Same as the resistance of a normal board C2227 HS_GND_TEST Same as the resistance of a normal board 2019-6-25 Huawei Confidential Page 46 of 67...

  • Page 47: Wi-Fi And Bluetooth Failure

    2 ohms? Replace the front cover 4.14.2 Maintenance Principle Test Point Network Normal Standard LB5201 VOUT_HLDO 1.2 V LB5204 VOUT_LNLDO_1 1.8 V C5215 VOUT_PA3P3 3.3 V 2019-6-25 Huawei Confidential Page 47 of 67...
  • Page 48 EML-L29V100R001 Advanced Maintenance Manual V2.1 INTERNAL 2019-6-25 Huawei Confidential Page 48 of 67...

  • Page 49: Gps Failure

    Is the power supply of If there are no soldering LB5601 normal? issues, replace U5602 Is the power Check the circuit for of each node on the circuit faulty components normal? Replace the PCBA 2019-6-25 Huawei Confidential Page 49 of 67...

  • Page 50: Maintenance Principle

    EML-L29V100R001 Advanced Maintenance Manual V2.1 INTERNAL 4.15.2 Maintenance Principle Test Point Network Normal Standard C5603 VDD_1P2 1.2 V C5606 VDD_1P1 1.1 V C5601 VDD_TCXO 1.8 V C5607 VDD1P8_AUX 1.8 V 2019-6-25 Huawei Confidential Page 50 of 67...

  • Page 51: Rf Failure (Cdma)

    Are the signals U3301 normal? Is the failure rectified after the related circuit is replaced? Replace Z3801. If the issue Replace U3802 persists, replace J3802 2019-6-25 Huawei Confidential Page 51 of 67...

  • Page 52: Maintenance Principle (Transmission)

    EML-L29V100R001 Advanced Maintenance Manual V2.1 INTERNAL 4.16.2 Maintenance Principle (Transmission) Signal flow in the CDMA transmission circuit: U3301 (RFIC) → U3401 (PA) → U3702 (DPDT) → Z3701 (diplexer) → J3703 (switch holder) 2019-6-25 Huawei Confidential Page 52 of 67...

  • Page 53: Maintenance Process (Reception)

    Z3801, and J3802 in transmission of the frequency band. Are sequence the signals normal? Are the RF signals received after U3301 normal? Is the failure rectified after the related circuit is replaced? Replace the modem U300 2019-6-25 Huawei Confidential Page 53 of 67...

  • Page 54: Maintenance Principle (Reception)

    INTERNAL 4.16.4 Maintenance Principle (Reception) Signal flow in the CDMA reception circuit: U3301 (RFIC) ← U3901 (LNA) ← U3401 (FEM) ← U3702 (DPDT) ← Z3701 (diplexer) ← J3703 (diplexer) ← antenna feed point 2019-6-25 Huawei Confidential Page 54 of 67...

  • Page 55: Rf Failure (Wcdma)

    Replace the corresponding diplexer based on the abnormal frequency band. Is the failure rectified? Is the failure rectified after the related circuit is replaced? Replace the DPDT of the Replace J3801 corresponding frequency band 2019-6-25 Huawei Confidential Page 55 of 67...

  • Page 56: Maintenance Principle (Transmission)

    Signal flow in the B1/B2/B4 transmission circuit: U3301 → U3501 (MB module) → U3701 (DPDT) → Z3701 (diplexer) → J3703 → antenna spring Signal flow in the B5/B8 transmission circuit: U3301 → U3401 (LB module) → U3702 (DPDT) → Z3701 (diplexer) → J3703 → antenna spring 2019-6-25 Huawei Confidential Page 56 of 67...

  • Page 57: Maintenance Process (Reception)

    Are the signals normal? Are the RF signals received after U3301 normal? Is the failure rectified after the related circuit is replaced? Replace the modem U300 2019-6-25 Huawei Confidential Page 57 of 67...

  • Page 58: Maintenance Principle (Reception)

    ← Z3701 (diplexer) ← J3703 ← antenna spring Signal flow in the B5/B8 reception circuit: U3301 ← U3901 ← U3401 (LB module) ← U3702 (DPDT) ← Z3701 (diplexer) ← J3703 ← antenna spring 2019-6-25 Huawei Confidential Page 58 of 67...

  • Page 59: Rf Failure (Gsm)

    Are the signals normal? Replace the corresponding diplexers U3702 and U3401 based on the abnormal frequency band. Is the failure rectified? Is the failure rectified after the related circuit is replaced? Replace U3301 Replace U3801 2019-6-25 Huawei Confidential Page 59 of 67...

  • Page 60: Maintenance Principle (Transmission)

    Signal flow in the GSM1800/GSM1900 transmission circuit: U3301 → U3402 → U3401 → U3702 → Z3701 (diplexer) → J3703 → antenna spring 4.18.3 Maintenance Process (Reception) The maintenance process is the same as that for WCDMA B5/B8, WCDMA B2, and LTE B3 reception failures. 2019-6-25 Huawei Confidential Page 60 of 67...

  • Page 61: Rf Failure (Tds/Lte)

    Are the signals normal? Replace the filter on the corresponding circuit based on the abnormal frequency band. Is the failure rectified? Is the failure rectified after the related circuit is replaced? Replace U3301 Replace U3801 2019-6-25 Huawei Confidential Page 61 of 67...

  • Page 62: Maintenance Principle (Transmission)

    HB: B1/B2/B3/B4/B9/TDS34/TDS39 UHB: B7/B38/B40/B41 LB: B5/B8/B12/B17/B18/B19/B20/B26/B28 4.19.2.1 Maintenance Principle for the HB Module Signal flow in the B1/B2/B3/B4/B9/TDS34/TDS39 transmission circuit: U3301 → U3501 → U3701 → Z3701 (diplexer) → J3703 → antenna spring 2019-6-25 Huawei Confidential Page 62 of 67...
  • Page 63 4.19.2.2 Maintenance Principle for the LB Module Signal flow in the B5/B8/B12/B17/B18/B19/B20/B26/B28 transmission circuit: U3301 → U3401 → U3702 → Z3701 (diplexer) → J3703 → antenna spring 4.19.2.3 Maintenance Principle for the UHB Module 2019-6-25 Huawei Confidential Page 63 of 67...

  • Page 64: Maintenance Process (Reception)

    Re-solder the circuit frequency band. Is the circuit properly soldered? Is the RF switch normal? Replace U3801 Replace the filter based on the abnormal frequency band. Is the failure rectified? Replace RF IC U3301 2019-6-25 Huawei Confidential Page 64 of 67...

  • Page 65: Maintenance Principle (Reception)

    4.19.4 Maintenance Principle (Reception) 4.19.4.1 Maintenance Principle for the Main HB Module Signal flow in the B1/B2/B3/B4/B9/TDS34/TDS39 reception circuit: U3301 ← U3901 ← U3501 ← U3701 ← Z3701 (diplexer) ← J3703 ← antenna spring 2019-6-25 Huawei Confidential Page 65 of 67...
  • Page 66 EML-L29V100R001 Advanced Maintenance Manual V2.1 INTERNAL 4.19.4.2 Maintenance Principle for the Main LB Module Signal flow in the B5/B8/B12/B17/B18/B19/B20/B26/B28 reception circuit: U3301 ← U3901 ← U3401 ← U3702 ← Z3701 (diplexer) ← J3703 ← antenna spring 2019-6-25 Huawei Confidential Page 66 of 67...
  • Page 67 C o m m and   i n  EM L-L29V 100R 001  A d vanced M ai ntenance M anual _V 2. 0-20180227. xl sx M ai ntenance Test Instructi o n  i n  EM L-L29V 100R 001  A d vanced M ai ntenance M anu Links-International Version-V1.0.xlsx 2019-6-25 Huawei Confidential Page 67 of 67...

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