Huawei YU220 Service Manual
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Huawei YU220 Service Manual

Huawei YU220 Service Manual

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YU220 advanced edition maintain
fiction：
examine and
verify：
ratify：
All right reserved,
service
V1.0
R&D
maintain sustain
serve representative date：
Huawei Technologies Co Ltd
Huawei Technologies Co.， Ltd.
Infringement shall investigate
All rights reserved
date：
2013-08-06
date：
2013-08-06
2013-08-06

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  • Page 1 YU220 advanced edition maintain service V1.0 fiction： R&D date： 2013-08-06 examine and maintain sustain date： 2013-08-06 verify： ratify： serve representative date： 2013-08-06 Huawei Technologies Co Ltd Huawei Technologies Co.， Ltd. Infringement shall investigate All right reserved, All rights reserved...
  • Page 2 YU220 service manualV1.0 Revise record Amend chapters Date Revised version Revise reason Amend describe Author and sections First draft 2013-08-05 V1.0 R&D issue Huawei secrets, no dispersion without permission 2013-10-18...

  • Page 3: Table Of Contents

    SIDEKEY ..........................57 5.16.1 MOTOR ............................错误！未定义书签。 5.16.2 G-SENSOR ..................................58 5.16.3 SIDEKEY ............................错误！未定义书签。 5.17 KEYPAD LIGHT ..............................59 CHAPTER 6 PCB BOARD AND BGA CHIP WELDING SPOT INDICATOR DIAGRAM ............61 Huawei secrets, no dispersion without permission 2013-10-18...
  • Page 4 MT6572 is baseband signal processing chip, which in charge of IMAGE, VIDEO, AUDIO, RF INTERFACES, CONECTIVITY signal input and output dispose. Baseband Interface section provides SIDEKEY、 LCD、SD card、Bluetooth、CAMERA、 TP connector and so on. MT6323 provide frequency including PA,VBAT input switch, output DC-DC,LDO， Huawei secrets, no dispersion without permission 2013-10-18...
  • Page 5 MT6166 RF chip and peripheral circuits. device subsystem GPS signal receiving and processing, including its GPS receive peripheral additional circuitryMT6627 Bluetooth and BT connector BT module WLAN complete baseband functionality and Huawei secrets, no dispersion without permission 2013-10-18...
  • Page 6 BT antenna, antenna, GPS antenna, FM antenna(headset). WCDMA power amplifier output Power coupler coupler power coupled in part the MT6166 power device detection performed. Huawei secrets, no dispersion without permission 2013-10-18...
  • Page 7 YU220 service manualV1.0 Chapter 1 MAINBOARD DEVICE LOCATION PLAN AND MATERIAL BOM INFORMATION Huawei secrets, no dispersion without permission 2013-10-18...
  • Page 8 YU220 service manualV1.0 BOM list below for information purposes only, to change without notice, To apply, please Huaqin company T project management system queries BOM latest information。 Huawei secrets, no dispersion without permission 2013-10-18...
  • Page 9 3 in 1 connector _H4.15mm_2sim+TF MT29C4G48M U601 MCP_4Gb-NAND_2Gb-DDR AAHBAAKS-5 U301 Baseband chip _WCDMA+MT6572A/X 39200562 JAF00-05164- J801 Earphone jack _height 4.2mm S137 Board to board connector_24pin_double DF37NC-24DS J903 row_socket_1.0H_0.4pitch -0.4V(51) Speaker U1101 WIFI-BT-FM-GPS 4 in 1 chip+MT6627N 39210152 Huawei secrets, no dispersion without permission 2013-10-18...
  • Page 10 LED white _HUE_N1,N3,CAE Contains only charge Q LTW-C193SN5 J901 LCD pad Attachment: maintain circuit diagram and bitmap AW290_MB_V2.0_130 AW290A_MB_器件位 515_final.pdf 号 图 _ V 2 . 0 4 _ 1 3 0 7 2 9 . p d f Huawei secrets, no dispersion without permission 2013-10-18...

  • Page 11: Chapter 3 Maintain Flow Direction

    YU220 service manualV1.0 Chapter 1 maintain flow direction Huawei secrets, no dispersion without permission 2013-10-18...

  • Page 12: Host Maintain Flow

    MT test can judge mobile signal whether good. Specific operational approach can refer to RF test guidance. Rewrite physics NO. ： Rewrite IMEI 、 SN 、 BT 、 MAC address information. This Huawei secrets, no dispersion without permission 2013-10-18...
  • Page 13 Mainrboard repair process description: mainboard repair process, please refer to the host repair processes, the difference is that recognize it not need to make the host MT test after fault repairing. 1.1 FLASHTOOL loading guidance（half-erasure FLASH or whole erasure FLASH） 1. Open FLASHTOOL Huawei secrets, no dispersion without permission 2013-10-18...
  • Page 14 Firmware->update, Press the volume up key to insert phone USB an enter into the FLASH semi erasure upgrade 2) Click Download，Press the volume up key to insert phone USB an enter into the FLASH whole erasure download, download complete as follow: Huawei secrets, no dispersion without permission 2013-10-18...
  • Page 15 If it need to change IMEI、WIFI and number，need to rewrite IMEI number and so on information, if it does not need to change, and close the item. c) Specific operation can refer to Write station instructions.HTM 1.3 Write custom-tailor information guidance. SimLock使用说明.d Huawei secrets, no dispersion without permission 2013-10-18...
  • Page 16 Chapter 2 Senior Maintenance Environment Tools List Name ：GPIB cable Purpose ：use for RF calibration Name：programmable power supply Purpose：use for mainboard power supply when RF calibration Name ：CMU200 Purpose ：RF calibration Name ：Multimeter Purpose：measuring voltage and current Huawei secrets, no dispersion without permission 2013-10-18...

  • Page 17: Fail To Start Up

    No current（direct-current main power supply） 1.4.1 No current ordinary have three probable reasons：1. Battery connector dry joint；2. Power key damage；3. Power key relevance circuit or power manage chip damage. Maintain flow： Huawei secrets, no dispersion without permission 2013-10-18...
  • Page 18 YU220 service manualV1.0 Does not boot current Check the battery connector J501 whether Replace J501 Weld, dirty, damaged? Inspect Boot Replace FPC disconnected, damaged? Check whether the FPC Reweld welding OK? Reweld or replace U501 Huawei secrets, no dispersion without permission 2013-10-18...
  • Page 19 Appear lower current after press power key（15—80MA）ordinary below reason： a) Software fault：Ordinary force upgrade. b) PM chip damage cause part of voltage without output. CPU or FLASH damage。 Boot sequence diagram on electricity ： Huawei secrets, no dispersion without permission 2013-10-18...
  • Page 20 YU220 service manualV1.0 Boot sequence diagram on electricity Maintain flow： Huawei secrets, no dispersion without permission 2013-10-18...
  • Page 21 YU220 service manualV1.0 PM voltage output list： Signal name Output reference Test point value VPROC_PMU 0.7~1.4V L501 0.5~3.4V L502 VSYS_PMU 2.2V L503 VRF18_PMU 1.8V C216 Huawei secrets, no dispersion without permission 2013-10-18...
  • Page 22 YU220 service manualV1.0 Huawei secrets, no dispersion without permission 2013-10-18...

  • Page 23: Large Current (Direct-Current Main Power Supply)

    PM After turn off the RF PA Replace bad (U101/U202/U203) Whether is device short-circuit? Check the battery connector Replace bad J501 whether there is a short device circuit element? Replace U501 （PM） Huawei secrets, no dispersion without permission 2013-10-18...
  • Page 24 YU220 service manualV1.0 Huawei secrets, no dispersion without permission 2013-10-18...
  • Page 25 YU220 service manualV1.0 Huawei secrets, no dispersion without permission 2013-10-18...

  • Page 26: Restart On Screen

    YU220 service manualV1.0 Restart fix screen Boot a start to the LCD light up but can't start, HOLD on huawei LOG, or restart, after a certain time on the LOG is to HOLD on the LOG. First consider the software bugs, reload the brush (not all) after boot, if not, need to erase all download experimental boot again.
  • Page 27 Measuring main voltage Ｎ replace U501 is normal Ｙ replace FLASH （ U601 ） Ｙ Whether is ＯＫ？ Ｎ replace CPU （ U301） Main supply voltage see 5.1.2 picture，part of LCD see below picture mark： Huawei secrets, no dispersion without permission 2013-10-18...
  • Page 28 YU220 service manualV1.0 Mobile phone automatically shut and crash. Automatic shut 1.6.1 For automatic shut phenomenon, firstly judge whether power key have Huawei secrets, no dispersion without permission 2013-10-18...
  • Page 29 10K in the normal temperature. 5) Above is OK，can check key power supply whether have short circuit phenomenon, thus can judge whether PMIC and BB chip etc and affiliated RC device cause. Huawei secrets, no dispersion without permission 2013-10-18...
  • Page 30 Mainly in the following analysis of the reasons 1) Whether CTP has already null and void, lead to user take for mobile Huawei secrets, no dispersion without permission 2013-10-18...
  • Page 31 FLASH point of glue, so weld will be more difficult. And then, consider CPU chip problem, CPU noumenon break down or weld cause FLASH corresponding data as well as order place mistake, it may be take place crash phenomenon. Huawei secrets, no dispersion without permission 2013-10-18...
  • Page 32 VBAT are relatively common phenomenon. You can use an external power connected to VBAT for seeing current, a quick disconnect after touching it to avoid any danger. For VBAT short circuit can refer to 5.1.3. Huawei secrets, no dispersion without permission 2013-10-18...
  • Page 33 CPU bad, this phenomenon is in the majority.； For L502 inductance, if close to PAD of PMIC over the ground short circuit, it can judge PMIC bad, if another PCD short circuit, it can see U202，U203 linked to internet bad. Huawei secrets, no dispersion without permission 2013-10-18...

  • Page 34: Speaker Noumenon Bad

    Other power also adopt to this similar way, to find short circuit hot location, find relevant internet, and find short circuit location. No Ring. Speaker is bad. 1.8.1 ： Can change another speaker to check, speaker location Speaker access 1.8.2 Huawei secrets, no dispersion without permission 2013-10-18...
  • Page 35 From above principle part, we can see speaker access from U501, R513,R541’s OR set out , and pass B703，B704 to reach speaker, so need to make sure the resistance and magnetic bead whether is OK.： Huawei secrets, no dispersion without permission 2013-10-18...
  • Page 36 YU220 service manualV1.0 All of are OK, need to CHECK C725,C726，VCR701，VCR702 whether have over the ground short circuit phenomenon： Last, above is OK, it can judge PMIC U501 chip bad. Huawei secrets, no dispersion without permission 2013-10-18...

  • Page 37: Receiver

    D704) for damage or short circuit, Weld, as described above are silent under normal circumstances, the handset can be judged to baseband chip U301 welding problems. No Receiver, receiver voice small. 1.10 circuit schematics ：  Huawei secrets, no dispersion without permission 2013-10-18...
  • Page 38 Overhaul flow：check MIC weld whether is OK, can change MIC test; put through telephone, measure mainboard MIC circuit magnetic bead capacitance weld whether is completed； MICBIAS0 whether have2.0v bias; check circuit whether have tainted stickers, stickers wrong question; additional welding baseband chip U301; Huawei secrets, no dispersion without permission 2013-10-18...
  • Page 39 1) Firstly check whether the antenna shrapnel contact pins bending or breakage, change it if have. 2) And then, check R101、R102 device whether have leak stick or dry joint phenomenon. Huawei secrets, no dispersion without permission 2013-10-18...
  • Page 40 YU220 service manualV1.0 3) Check U102、U103 whether have dry joint. Huawei secrets, no dispersion without permission 2013-10-18...

  • Page 41: Recognize Card

    YU220 service manualV1.0 No recognize card. 1.12 SIM card fail to recognize. 1.12.1 SIM card，T card circuit： Huawei secrets, no dispersion without permission 2013-10-18...
  • Page 42 YU220 service manualV1.0 Huawei secrets, no dispersion without permission 2013-10-18...
  • Page 43 YU220 service manualV1.0 Analysis process： Huawei secrets, no dispersion without permission 2013-10-18...
  • Page 44 T card in the signal path and no series resistance, analytical process is as follows： Fail to recognize T card Reweld U501 VMCH_PMU Voltage is normal SCLK,DAT,C Reweld MD is U301 or whether replace normal? No camera 1.13 Schematic diagram.： Huawei secrets, no dispersion without permission 2013-10-18...
  • Page 45 CPU exception, can be welded CPU retest. If the external signal has, then we can conclude that the connector is bad, can be welded in the test Huawei secrets, no dispersion without permission 2013-10-18...
  • Page 46 Air welding Short circuit Clock with output Air welding Retest after weldin Short circuit Data are output Air welding Air welding Plus welding connectors Replace CPU Touch panel not work 1.14 Schematic diagram： Huawei secrets, no dispersion without permission 2013-10-18...
  • Page 47 CPU exception, can be welded and then measuring. 3、Is there a control signal output, use the oscilloscope to measure whether thereSDA0 and SCL0 signal output, if abnormal, U301 body bad. Huawei secrets, no dispersion without permission 2013-10-18...
  • Page 48 The other one is a mobile phone while charging display, but cannot charge the battery. For non-charging fault plane, first test I / O interface, see if there is visible damage Maintain process： Huawei secrets, no dispersion without permission 2013-10-18...
  • Page 49 Measuring J801 Pin1 if the voltage is 5V ？ replace J801 about 5 v Measure the voltage Q02 （ ReplaceQ501 Pin1,2,5,6 ） ≈Vd（Pin4 ）？ R504 whether is Replace R504 0.2R Replace U501 （PM） Huawei secrets, no dispersion without permission 2013-10-18...
  • Page 50 YU220 service manualV1.0 Huawei secrets, no dispersion without permission 2013-10-18...
  • Page 51 YU220 service manualV1.0 Earphone problem 1.16 Earphone schematic diagram： Huawei secrets, no dispersion without permission 2013-10-18...
  • Page 52 EINT_HP whether the signal has been low, if the test has been low, respectively,B801, B802, short circuit (may be sequentially removed B801, B802 look headset unplugged, EINT_HP signal is set high) Huawei secrets, no dispersion without permission 2013-10-18...
  • Page 53 HPLP \ HPRP out from the baseband chip signal, and then followed by measurement of C802, C803, R801, R802 side, then B801, B802-side, then turn the investigation where problem。 Huawei secrets, no dispersion without permission 2013-10-18...
  • Page 54 MIC signal voltage measuring MICBIAS1 whether 2V, the case of 2V, then 。 measure whether MICP signal if AU_VIN1_N / P a signal, it indicates that the U501 Weld 1.17 Schematic diagram: Huawei secrets, no dispersion without permission 2013-10-18...
  • Page 55 YU220 service manualV1.0 Huawei secrets, no dispersion without permission 2013-10-18...

  • Page 56: Gps Wifi Bt

    FM chip U1101 Weld or damaged. 1.18 GPS WIFI BT This is a functional relationship with the U1101 and U301 large, first determine ： several voltage is normal, if not normal, then re-change U501 Huawei secrets, no dispersion without permission 2013-10-18...

  • Page 57: Motor G-Sensor Sidekey

    U1101 can; Finally if the U1101 correctly after changing or abnormal, consider U301 chip issues, the need for U301, problem solving。 1.19 Motor G-SENSOR side key Motor 1.19.1 Motor circuit： Huawei secrets, no dispersion without permission 2013-10-18...

  • Page 58: G-Sensor

    I2C signal output, and whether there ENIT, the final judgment this bad chip If it still have problem then can make sure U301 bad, change new one can solve problem. Huawei secrets, no dispersion without permission 2013-10-18...

  • Page 59: Sidekey

    U301 chip, the chip can be changed. Power button is on the U501 communication, first rule out FPC and welding monomer no problem, consider whether short varsities, and then consider theU501 problem can be. 1.20 Keyboard light Keyboard light circuit： Huawei secrets, no dispersion without permission 2013-10-18...
  • Page 60 Finally, whether the transistor is installed is damaged, or does not turn-on voltage。 Finally, whether the enable signal when the keyboard light should not to be pulled, not pushed, it indicates a problem U301, U301 can be changed again. Huawei secrets, no dispersion without permission 2013-10-18...

  • Page 61: Chapter 6 Pcb Board And Bga Chip Welding Spot Indicator Diagram

    YU220 service manualV1.0 Chapter 2 PCB board and BGA chip welding spot indicator diagram Red （R:255,G:0,B:0） : hollow dot Green （R:0,G:255,B:0） :touch down point Blue （R:0,G:0,B:255） :welding spot Mainboard graph： Front ： Huawei secrets, no dispersion without permission 2013-10-18...
  • Page 62 YU220 service manualV1.0 Reverse side： Huawei secrets, no dispersion without permission 2013-10-18...
  • Page 63 YU220 service manualV1.0 Huawei secrets, no dispersion without permission 2013-10-18...
  • Page 64 YU220 service manualV1.0 BGA chip welding drawing： MT6572+FLASH: Huawei secrets, no dispersion without permission 2013-10-18...
  • Page 65 YU220 service manualV1.0 PMIC_MT6323: MT6166: Huawei secrets, no dispersion without permission 2013-10-18...
  • Page 66 YU220 service manualV1.0 Huawei secrets, no dispersion without permission 2013-10-18...

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