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YU220 service manualV1.0

2013-10-18

Huawei

secrets,

no dispersion without permission

1.4.3

Large current (direct-current main power supply)

Large current（current greater than 500MA）divide 2 situation：

1） press power key appear large current；This type of situation mainly is

due to PM damage or PM output current short circuit cause.

2） too large current (off-state current is greater than 500MA). VBAT is

mainly caused by short circuit to ground

Does not

boot -
Large

current

Measuring

VBAT

Whether

shorted to ground?

After turn off the RF PA

(U101/U202/U203) Whether is

short-circuit?

Check the battery connector

J501 whether there is a short

circuit element

Check VPH_PWR

circuit and output

circuit PM

Replace bad

device

Replace

U501

（

）

Replace bad

device

Содержание YU220

Страница 1: ...fiction R D date 2013 08 06 examine and verify maintain sustain date 2013 08 06 ratify serve representative date 2013 08 06 Huawei Technologies Co Ltd Huawei Technologies Co Ltd All right reserved Infringement shall investigate All rights reserved ...

Страница 2: ...vice manualV1 0 2013 10 18 Huawei secrets no dispersion without permission Revise record Date Revised version Revise reason Amend chapters and sections Amend describe Author 2013 08 05 V1 0 First draft issue R D ...

Страница 3: ...OWER CURRENT DIRECT CURRENT MAIN POWER SUPPLY 19 5 1 3 LARGE CURRENT DIRECT CURRENT MAIN POWER SUPPLY 23 5 2 RESTART ON SCREEN 26 5 3 utomatic shutdown crash 28 5 3 1 auto power off 28 5 3 2 SYSTEM HALTED 30 5 4 MOBILE PHONE HOT STANDBY TIME IS SHORT 32 5 5 NOT RING 34 5 5 1 speaker noumenon bad 34 5 5 2 speaker access 34 5 6 NO RECEIVER 37 5 7 NO SPEAKER LOW SPEAKER VOICE 37 5 8 NO SIGNAL FEEBLE ...

Страница 4: ...D DDR1 G SENSOR CAM CTP IQ control Power Control GPIO MT6627N IQ control Connector WIFI BT FM GPS Power UMTS GSM WIFI BT Antenna EXTERNAL CHARGER Power Power VIBRATOR KEY BACK LIGHT Matching BPI control Duplexer Matching WPA Matching Matching Matching Matching GPA SAW Matching 26MHz MT6572 is baseband signal processing chip which in charge of IMAGE VIDEO AUDIO RF INTERFACES CONECTIVITY signal inpu...

Страница 5: ...cessors application DSP dedicated data mover and so on User interface processing unit Camera connector broadband CODEC Vocoder RF connector LCD connector SD connector USB connector UART connector USIM card connector GPIO keypad connector and so on Multi media and game engine Multimedia and game engine running Mpeg jpeg hardware engine MP3 MMS MIDI function power management MT6323 Power voltage sup...

Страница 6: ...to crystal oscillator not previous warm oscillator Local produce precision 26MHz reference clock TCXOC antenna External antenna interior connector device antenna fence Phone offers a built in antenna in order to complete the communication support WCDMA and low frequency bands U8860 42 mobile phone antenna comprising a main antenna diversity antenna wifi BT antenna GPS antenna FM antenna headset co...

Страница 7: ...YU220 service manualV1 0 2013 10 18 Huawei secrets no dispersion without permission Chapter 1 MAINBOARD DEVICE LOCATION PLAN AND MATERIAL BOM INFORMATION ...

Страница 8: ...1 0 2013 10 18 Huawei secrets no dispersion without permission BOM list below for information purposes only to change without notice To apply please Huaqin company T project management system queries BOM latest information ...

Страница 9: ...95H Q0F0A U101 RF amplifier module _900 1800 RF7182DTR13 马达 Shake device J501 Battery connector _3pin_4 0H _3 0 PITCH PAN30 03402 S113 J802 IO connector _MicroUSB _5pin UAF95 05164 1522 X501 Crystal _32 768K_20ppm_12 5pF SSP T7 F X201 Crystal_26M_10ppm_7 4pF_3225 X1E000021043 400 J701 Mic U501 Power management chip MT6323GA 39200536 J1001 3 in 1 connector _H4 15mm_2sim TF WKSM022 41 01 U601 MCP_4G...

Страница 10: ...t permission U801 Acceleration sensor IC chip _3 axle BMA220 D1001 D10 03 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_130 515_final pdf AW290A_MB_器件位号图 _ V 2 0 4 _ 1 3 0 7 2 9 p d f ...

Страница 11: ...YU220 service manualV1 0 2013 10 18 Huawei secrets no dispersion without permission Chapter 1 maintain flow direction ...

Страница 12: ...sing FLASHTOOL erasu re FLASH Step explain FLASHTOOL half erasure FLASH FLASHTOOL half erasure FLASH no erasure FLASH information of intrinsic RF correct will not lost it doesn t need to correct Specific loading method can refer to below FLASHTOOL loading guidance FLASHTOOL erasure FLASH After erasure FLASH all information in FLASH will be erasure and empty Specific erasure method can refer to bel...

Страница 13: ...out lock nets and other customized information this step can be skipped Specific methods of operation please refer to the following guidelines to write customized information RF calibration measurement RF calibration and RF functional test pass RF calibration can make mobile RF performance to reach the best state RF functional test can detect whether the indicators of RF compliance Specific test m...

Страница 14: ... box button choose SCATTER TEX document in YU220 software to load Attention firstly need to delete check sum document in software Click 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 ...

Страница 15: ...r Information Operation as follow 1 Install framework HQ_Framework_v2 4_130708 rar 2 Install writes number tool HQ_WriteStation_V2 1_130701 rar 3 Click running a Click Help check operation instruction according to operation instruction to configure AP DB file document with software sent to user b If it need to change IMEI WIFI and number need to rewrite IMEI number and so on information if it does...

Страница 16: ...ion 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 ...

Страница 17: ...t scheme For those fault phones which could not start up please firstly check I O connector battery connector whether have apparent damage If I O connector battery connector is OK it can use DC stabilized power to supply power for phone check the current of the fault phones No boot fault can be divided into the boot no current low current high current In maintenance please according to the followi...

Страница 18: ...dispersion without permission Does not boot no current Check the battery connector J501 whether Weld dirty damaged Replace J501 Inspect Boot FPC is disconnected damaged Replace FPC Check whether the FPC welding OK Reweld Reweld or replace U501 Y N Y N Y N ...

Страница 19: ...sion 1 4 2 Low current direct current main power supply 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 c CPU or FLASH damage Boot sequence diagram on electricity ...

Страница 20: ...YU220 service manualV1 0 2013 10 18 Huawei secrets no dispersion without permission Boot sequence diagram on electricity Maintain flow ...

Страница 21: ...nualV1 0 2013 10 18 Huawei secrets no dispersion without permission PM voltage output list Signal name Output reference value Test point VPROC_PMU 0 7 1 4V L501 VPA 0 5 3 4V L502 VSYS_PMU 2 2V L503 VRF18_PMU 1 8V C216 ...

Страница 22: ...YU220 service manualV1 0 2013 10 18 Huawei secrets no dispersion without permission ...

Страница 23: ...PM damage or PM output current short circuit cause 2 too large current off state current is greater than 500MA VBAT is mainly caused by short circuit to ground Does not boot Large current Measuring VBAT Whether shorted to ground After turn off the RF PA U101 U202 U203 Whether is short circuit Check the battery connector J501 whether there is a short circuit element Check VPH_PWR circuit and output...

Страница 24: ...YU220 service manualV1 0 2013 10 18 Huawei secrets no dispersion without permission ...

Страница 25: ...YU220 service manualV1 0 2013 10 18 Huawei secrets no dispersion without permission ...

Страница 26: ...OG 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 Ruled out after a software problem still on screen or restart consider whether the LCD welding problems or LCD damage of ontology Finally parallel consider main power output is normal and CPU FLASH if the power output of OK consider the CPU FLASH w...

Страница 27: ...Restart fixed screen No erasure and all erasure update software End LCD Welding or body damage End Measuring main voltage is normal replace U501 replace CPU U301 Y N Y N ＮＹ replace FLASH U601 Whether isＯＫ End ＹＮ Main supply voltage see 5 1 2 picture part of LCD see below picture mark ...

Страница 28: ...rvice manualV1 0 2013 10 18 Huawei secrets no dispersion without permission 1 6 Mobile phone automatically shut and crash 1 6 1 Automatic shut For automatic shut phenomenon firstly judge whether power key have ...

Страница 29: ... pad on the FPC welded PCB whether slight short circuit link tin 3 Judge cell voltage whether above than 3 6V 4 Judge PIN in the middle of battery and among earth impedance whether 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 ...

Страница 30: ...edance at room temperature is 10K Replace battery N Y Charge the battery or replace the battery N Main voltage is OK Replace PMIC or CPU 1 6 2 Crash The phenomenon of death is for a cell phone stuck in boot screen or stay in one of the user s screen the phone cannot use the touch panel cannot t slide and some need to disconnect the battery to reboot the only solution and some cannot Mainly in the ...

Страница 31: ...LASH weld reason or FLASH noumenon break down need to a Firstly try to refresh software again b If refresh software cannot solve it must change FLASH in view of the machine on the FLASH point of glue so weld will be more difficult 3 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 ...

Страница 32: ...y check whether each power supply is shorted to ground in view of the hot location you can quickly touch the PCB board by hand to see where location heat you can quickly locate The main three power circuit and 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 r...

Страница 33: ...dance to ground If the PAD near PMIC shorted to ground which means that the PMIC bad on the contrary it means the back of a short circuit inductance In brief for L501 inductance if close to PAD of PMIC over the ground short circuit it can judge PMIC bad if another PAD short circuit it can see link to CPU from internet CPU bad this phenomenon is in the majority For L502 inductance if close to PAD o...

Страница 34: ...ose to PAD of PMIC over the ground short circuit it can judge PMIC bad Other power also adopt to this similar way to find short circuit hot location find relevant internet and find short circuit location 1 8 No Ring 1 8 1 Speaker is bad Can change another speaker to check speaker location 1 8 2 Speaker access ...

Страница 35: ... Huawei secrets no dispersion without permission 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 ...

Страница 36: ...alV1 0 2013 10 18 Huawei secrets no dispersion without permission 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 ...

Страница 37: ...receiver signal output for RECEIVER Repair process check whether the welding RECEIVER is good checks around the earpiece device R708 R709 C715 C716 C717 D703 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 1 10 No Receiver receiver voice small circuit schematics ...

Страница 38: ...nput channels VMICBIAS0 work for the MIC bias voltage failure analysis processes Fault Call opposite cannot listen to voice 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 MIC circuit whether have tainted stickers stickers wrong question additi...

Страница 39: ...No signal weak signal is ordinary because of RF access barrier or antenna contact is not good cause there have three reasons as follow 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 ...

Страница 40: ...YU220 service manualV1 0 2013 10 18 Huawei secrets no dispersion without permission 3 Check U102 U103 whether have dry joint ...

Страница 41: ...YU220 service manualV1 0 2013 10 18 Huawei secrets no dispersion without permission 1 12 No recognize card 1 12 1 SIM card fail to recognize SIM card T card circuit ...

Страница 42: ...YU220 service manualV1 0 2013 10 18 Huawei secrets no dispersion without permission ...

Страница 43: ...YU220 service manualV1 0 2013 10 18 Huawei secrets no dispersion without permission Analysis process ...

Страница 44: ...on 1 12 2 Fail to recognize T card T card in the signal path and no series resistance analytical process is as follows Yes No No Fail to recognize T card VMCH_PMU Voltage is normal SCLK DAT C MD is whether normal OK Reweld U501 Reweld U301 or replace 1 13 No camera Schematic diagram ...

Страница 45: ...he socket bad contact 3 connector dry joint 4 CPU chip U301 exception So first determine whether there is power cord if the power cord abnormalities first determine whether a short circuit short circuit please remove the appropriate path if the capacitance if not short circuit the plus welding PMU circuit look at whether there is a clock signal output without output you can first add welding CPU c...

Страница 46: ...c diagram No No Yes Camera abmornal Webcam monomer exception Power supply output Retest after weldin g Update the new monom er Short circuit or Air welding Clock with output Data are output Air welding connectors No Short circuit or Air welding No Short circuit or Air welding Yes Plus welding Yes Yes Yes No Replace CPU ...

Страница 47: ...1 Input power is normal if the input voltage is abnormal first determine whether a short circuit remove the capacitors on the line after the short circuit Measurement there may be chips and connectors J902 U501 causing a short circuit can be re welded and then measuring 2 Reset signal is pulled up if the working time is low the CPU exception can be welded and then measuring 3 Is there a control si...

Страница 48: ... Power circuit I2C RST signal is normal Yes Update and replace U501 No Replace U301 Yes No 1 15 Charge fault Failure Analysis The phone cannot charge The failure are usually two situations First connect the charger to the phone the phone did not respond 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 ...

Страница 49: ...charge Check J801 whether the virtual welding deformation damage and other anomalies J Measuring J801 Pin1 if the voltage is about 5 v 5V ReplaceJ801 replaceJ801 ReplaceU501 PM Y N N Measure the voltage Q02 Pin Vs Pin1 2 5 6 Vd Pin4 N ReplaceQ501 R504 whether is 0 2R N Replace R504 Y Y Y ...

Страница 50: ...YU220 service manualV1 0 2013 10 18 Huawei secrets no dispersion without permission ...

Страница 51: ...YU220 service manualV1 0 2013 10 18 Huawei secrets no dispersion without permission 1 16 Earphone problem Earphone schematic diagram ...

Страница 52: ... EINT_HP signal is pulled low not pulled low and then sequentially detects R805 whether Weld B804 bead inductors are Weld headphone socket is soldered the headset is bad Fault 2 always show headset is plugged unplug the headset cannot be detected Repair process first rule headset monomer problem if not the headphones own fault then plug in your headphones and then pull out after the first measurem...

Страница 53: ...wer Yes Rep a ce D808 Replace or plug weld U501 Fault 3 plug in your headphones there are tips but no sound headphones Repair process first rule headset monomer problem then plug in your headphones and play the ring tone and other audio signals with an oscilloscope measurement HPLP HPRP out from the baseband chip signal and then followed by measurement of C802 C803 R801 R802 side then B801 B802 si...

Страница 54: ...Whether has signal Y N Replace earphone connector Y First insert the ear And play C802 C803 Fault 4 plug in your headphones there are tips but the headset MIC invalid Repair process First replacement headphones headset monomer exclude issues such as the problem itself is not a headset insert the headset call state when speaking on the MIC signal voltage measuring MICBIAS1 whether 2V the case of 2V...

Страница 55: ...YU220 service manualV1 0 2013 10 18 Huawei secrets no dispersion without permission ...

Страница 56: ...e switching process FM do not work or abnormal Repair process FM function in the open state see the headphone port antenna PIN correctly Measuring AVDD28_FM voltage is normal if not normal instructions powered PMIC Weld or damage such as normal and then measuring FM_DATA FM_CLK signal is correct if not correct the problem is U301 signal if the above is correct then to see whether the FM chip U1101...

Страница 57: ...1103 and resistor R1102 is normal These are normal circumstances can determine U1101 Quad processor chip exception consider the phenomenon of exclusion Weld or short but you can change 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 1 19 1 Motor Motor circuit ...

Страница 58: ...blem change new one that can solve problem 1 19 2 G SENSOR G SENSOR circuit Firstly judge voltage 1 8Vwhether normal if it is abnormal check it whether short circuit it can judge order chip or PMIC problem if it is short circuit If the voltage is normal you need to determine whether the normal I2C signal output and whether there ENIT the final judgment this bad chip If it still have problem then c...

Страница 59: ...er two resistors R1006 R1007 are OK and then determine when pressing the upper or lower button when the upper or lower key is shorted to ground if it means short circuit the normal not short circuit the problem can be determined 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 con...

Страница 60: ...tly judge the keyboard light paster whether have problem dry joint or short circuit or reverse weld problem it need to affirm welding series resistor whether unusual if the light have no problem 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 U...

Страница 61: ...18 Huawei secrets no dispersion without permission 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 ...

Страница 62: ...YU220 service manualV1 0 2013 10 18 Huawei secrets no dispersion without permission Reverse side ...

Страница 63: ...YU220 service manualV1 0 2013 10 18 Huawei secrets no dispersion without permission ...

Страница 64: ...YU220 service manualV1 0 2013 10 18 Huawei secrets no dispersion without permission BGA chip welding drawing MT6572 FLASH ...

Страница 65: ...YU220 service manualV1 0 2013 10 18 Huawei secrets no dispersion without permission PMIC_MT6323 MT6166 ...

Страница 66: ...YU220 service manualV1 0 2013 10 18 Huawei secrets no dispersion without permission ...

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