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U8860 Maintenance Manual V1.0

1. Bit 15040208 Transient voltage suppression diode 6 8 V 11 4 V 75 W 7 D1301 D1601 A SOT 363 15040238 Transient voltage suppression diode 6 V 14 V 10 W 12 D1501 A SOD882 0402 Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 9 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 4 Components on PCBA 15020099 Lighting diode 0 045 cd White 25 mA 0603 SMD D1502 D1503 D1504 D1505 15010251 Schottky diode 30 V 0 2 A 0 5 V SOD523 D2001 D4001 19040121 Fast Blowout Fuse 32 V 2 A IEC Spec 0 03 ohm 0 100 F1501 A A Sec UL CSA ANSI 248 Certificated 14090079 FPC connector 27pin 0 6 mm 0 3 mm horizontal 0 2 mm J1201 14240246 J1301 Headphone Connector 3 5 mm 6 pin Side plugging SMT Mid Mount 1 85 mm Height from PCB Top Side Arc type 14240100 Card holder connector battery socket 3PIN side contact 2 8 J1501 mm 1 4 mm with positioning peg 14240272 IO connector Micro_B Female Spin bend SMT J1502 14240207 Card holder connector SIM card socket 6 Pin horizontal 2 54 J1601 mm without clip without positioning peg SMT spherical structure height 2 0 mm 14240243 J1602 Card holder connector Micro SD Receptacle 10 Pin bend 1 1 mm without clip without positioning peg 14240181 BTB connector female 24 0 4 mm 1 mm SMT J1302 J1901 J1902 13010265 SAW filter 1574 42 MHz 1605 89 MHz 2 2 dB 50 J4105 V 1411 Balance 07050063 NTC 150000 ohms SMT 0402 RT301 07040061 Varistor 12 V 99999 V 5A 25
2. N Check the VPH PWR circuit and the PM output circuit Is problem solved after the RF PA Y Replace the faulty U3402 U3803 U3501 is removed components successively N Y Replace the faulty components e circuit of the battery connection Replace U301 9 2 2 Charging Management Circuits Circuit schematic diagram The power supply of MSM8255 supports two external charging modes charger mode and USB mode The schematic diagram is shown as follows Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 37 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 9 Principles and Troubleshooting 01001 L1001 close to U1001 on the board 07091450 0 068 BQ24152 Al E e 1 EO E a E YCHG u L1001 lu R1003 D 0 YPH_PWR g CLOOS 10n a a o o o Bl ile B2 B3 E Tu E DEDO o ie py 1I2C_SDA_DCDC B4 AUXPWR R1006 20 C4 I2C can be 1 8 or 2 6Y addrass 01101011 D4 The dedicated power supply chip bq24152 is adopted to charge the phone with 1A power The I2C is adopted to perform communication and control GPIO149 and GPIO150 The charging management chip obtains power from the VCHAG of the USB port The chip is controlled by the I2C The output VPH_PWR supplies power for the PM and charges the battery This chip supports three modes charging mode boost mode and high resistance mode The charging mode is normal charging process The boost mode is USB OTG mode The high resistance
3. 9 4 2 Keypads The U8860 has seven keys Four of them are on the touch panel You can answer a call hang up a call view the menu and back the previous operation by touching them The GPIO_01 Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 46 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 9 Principles and Troubleshooting and GPIO_02 on the side of the PM8058 are Volume key and Volume key The Power key is detected by KYPD_PWR_N on the PM8058 side instead of the scanning mode The brightness of the keypad s backlight LEDs can be adjusted by KYPD_DRV_N PM8058 and it is supplied with power by VPH_PWR The keypad LEDs are the four LEDs on the LCD D1505 2 1 ustifigg130 D1502 2 1 H ran D1503 1 2 asf agrzo 2 D1504 ustifeg130 Keypad backlight driver VPH_PWR Power supply Backlight power supply KPD_DRV_N Backlight driver When the level is low the four backlight LEDs pin light Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 47 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 9 Principles and Troubleshooting Troubleshooting process The keypad does not function Does the keypad FPC have defects such as damage or fold Replace the FPC Does the connector J1302 have defects such as cold soldered damaged or distorted Y Replace J1302 N Replace U301 9 4 3 Vibration Ci
4. ODA GSE CAM SCL GSE CAM CAMTF DATA 11 CAMIF DATA 10 CAMIF DATA 9 CAMIF DATA 6 CAMIF DATA T 21004 cigog AVDD TODD DYDD 10 100 IT CAMIF FCLE 33 C CAMIF SHDN OUT SLAVE AMIF RESET OUTS SLAVE CAMIF_VSYNC CAMIF HS NC CAMIF MCLE CAMIF DATA 6 CAMIF DATA 5 CAMIF DATA 4 7 INN Rigdd CAMIF PCLE_S The 8 megapixel primary camera uses the 24 pin BTB connector and is controlled by the I2C bus The data is transmitted in MIPI mode After the camera functions are enabled and the camera is powered on the system establishes control communication with the camera through the I2C bus to control the camera The camera communication is implemented depending on the MIPI interface The data is synchronously provided by two CAMMIPI clocks and is transmitted by data interface Huawei Proprietary and Confidential 59 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 9 Principles and Troubleshooting During focal length adjustment the internal motor is supplied with power by VREG CAM 2P85 and the control signal is provided by CAMIF_RESET_OUTS_N The 0 3 megapixel secondary camera shares the DC bus with the 8 megapixel primary camera The data is transmitted in RAW mode The interface definitions are as follows CAMIF_HSYNC Line synchronizing signal CAMIF_VSYNC Frame synchronizing signal SCL_GSB_CAM DC control signal SDA_GSB_CAM The function implementation method for the secondary camera
5. US860 Maintenance Manual Issue 1 0 Date 2011 11 14 Wz HUAWEI TECHNOLOGIES CO LTD HUAWEI Copyright Huawei Technologies Co Ltd 2011 All rights reserved No part of this document may be reproduced or transmitted in any form or by any means without prior written consent of Huawei Technologies Co Ltd Trademarks and Permissions Wiz Huawei and other Huawei trademarks are trademarks of Huawei Technologies Co Ltd All other trademarks and trade names mentioned in this document are the property of their respective holders Notice The purchased products services and features are stipulated by the contract made between Huawei and the customer All or part of the products services and features described in this document may not be within the purchase scope or the usage scope Unless otherwise specified in the contract all statements information and recommendations in this document are provided AS IS without warranties guarantees or representations of any kind either express or implied The information in this document is subject to change without notice Every effort has been made in the preparation of this document to ensure accuracy of the contents but all statements information and recommendations in this document do not constitute a warranty of any kind express or implied Huawei Technologies Co Ltd Address Huawei Industrial Base Bantian Longgang Shenzhen 518129 People s Republic of China
6. Is the circuit between MIC2N MIC2P and U4001 short circuited Re solder or replace U4001 9 4 7 SIM Card Circuit schematic diagram r USIM CLK USIM RST Issue 1 0 2011 11 14 Huawei Proprietary and Confidential Copyright O Huawei Technologies Co Ltd U8860 Maintenance Manual 9 Principles and Troubleshooting USIM interface of the MSM8255 USIM_IO SIM data line USIM_RST SIM reset signal USIM_CLK SIM clock USIM_VCC SIM power supply 1 8 V 3 0 V After 1s phone is powered on it will detect the SIM card If the SIM card is found it will start data communication and the preceding pins will perform power clock and data transmission If the SIM card is not found the system does not detect SIM card status Therefore it does not support hot swap Troubleshooting process Failure The USIM card cannot be detected Solution Firstly check whether the software is faulty or the USIM card is damaged If the card is not damaged perform the following procedure No USIM card is found N Re solder or replace the USIM card socket J1601 Y Replace D1601 After the cabling N problem is Is the USIM card socket normal Is D1601 short circuited Pin3 and Pin6 is ground Are the power supply pin and signal pin normal excluded re solder or replace the U301 Re solder or replace the U301 Issue 1 0 2011 11 14 Huawei Proprietar
7. Testing approach sensor function Testing the approach sensor s environment light sensing function Huawei Proprietary and Confidential 11 Functional Tests Test the microSD card functions If a microSD card 1s found and is available the test succeeds Otherwise the information indicating the test fails Then press the Volume to perform the next test Press a key and the color of its corresponding icon on the LCD is changed After all keys are tested press the Volume to perform the next test Press the Volume to display the white screen Press the Volume to display the black screen Press the Volume to display a triple color bar red green and blue If the LCD backlight blinks continuously the test succeeds Press the Volume to perform the next test After the phone displaying the preview screen press the Volume to capture the image If the LED flash blinks one time the test succeeds Press the Volume to perform the next test After the phone displaying the preview screen press the Volume to perform the next test Touch around the touch panel After the edge of the touch panel displays red totally the test succeeds Press the Volume to perform the next test Place the shielding board above the touch panel and keep it away from the photic hole for about 4 mm If a phone icon is displayed nearby the portrait the function is normal Check whether the environment light data is dete
8. The approach sensor functions are disabled Is the problem solved after the software is loaded Is the problem solved after the approach sensor light hole is cleaned Is the problem solved after the approach sensor is replaced Is the problem solved after the FPC is replaced N Are the cornponents on the touch panel s power supply circuit and control circuit damaged or short ircuited Issue 1 0 2011 11 14 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd End End 9 Principles and Troubleshooting 74 U8860 Maintenance Manual 10 Solder Points on the PCB and BGA Chip Solder Points on the PCB and BGA Chip Red R 255 G 0 B 0 E point Green R 0 6 255 B 0 WAR point Main board diagram Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 75 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual Issue 1 0 2011 11 14 10 Solder Points on the PCB and BGA Chip suor Huawei Proprietary and Confidential Copyright O Huawei Technologies Co Ltd E HAI Pai UM j UN nN A na an 76 U8860 Maintenance Manual 10 Solder Points on the PCB and BGA Chip jc FM 0 qm acta im geen umas Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 77 Copyright H
9. nail and letting the air in 10 Unfasten the screw and gently remove the cover 11 1 Take out the component and remove the TP gently Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 23 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 7 Disassembly Procedure 12 1 After removing the TP use a tweezers to lift the gently four buckles of the LCD front cover one of the buckles lies under the side key FPC Usually after emoving three buckles the LCD can be removed see Figure 12 2 for precautions 11 2 Take out the component and remove the TP 12 2 Note the LCD glass is thin and easy to be broken During disassembly place the tweezers against 13 Remove the LCD The disassembly is completed the buckle instead of the glass The LCD must not be distorted Issue 1 0 2011 11 14 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 24 U8860 Maintenance Manual 8 Assembly Procedure Assembly Procedure 1 Ensure that the ESD wrist strap is well grounded Start to assemble the US860 4 Install the receiver 3 Install the speaker Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 25 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 8 Assembly Procedure 5 Install the FPC and ensure that the FPC aligns the 6 Connect the BTB connector positioning rod 7 Connect the BTB connector 8 Install the m
10. transmission failure degree rotation sensing Manor BEN U3304 duplexer RX 2110 2170 MHzZ TX 1920 1980 MHz J6003 RF connector 1 9dB failure results damage results in A in vv2100 MHz GPS failure transmission and reception failure J1902 BTB connector and primary camera interface damages result in primary camera failure U1102 LED flash driver IC damage results in camera flash failure mem J1301 headphone MIC2001 microphone y sd SO PR connector 3 5 mm damage results in low Eri damage results in or noisy transmitted a Bil idade headphone failure voice Sias J1901BTB connector and front camera damages result in front camera failure Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 8 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 4 Components on PCBA Power key damage Approach light sensor BTB connector damage results in power on failure damage results in ambient results in power on failure light and approach light TP failure motor vibrating sensing failure failure speaker soundless and approach light failure Volume key damage results that volume cannot be adjusted by pressing volume key Flash damage results in flash function failure Motor damage results in vibration failure TP BTB connector damage results in touch panel failure Speaker connection point damage results in speaker failure
11. Start to disassemble the U8860 U8860 disassembly guide 1 Remove the battery cover 2 Remove the battery Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 17 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 7 Disassembly Procedure R EMOD 2 pas I IAEA OR nee A wm ne SU 0 ou i BP REM o a 3 Remove the six screws from cover B 4 Use a cover opener to loosen the buckle between cover A and cover B ro 9 PRA des 2 5 Turn over the buckle in the ZIF interface 6 Carefully take out the FPC cable Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 18 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 7 Separate the FPC and the main board Note there is double sided tape between FPC and shielding cover carefully perform the operation to avoid damaging the FPC 9 Loosen the BTB connector 7 Disassembly Procedure 8 Turn over the main board and loosen the BTB connector 10 Carefully separate the FPC and cover B Note there is double sided tape between the FPC and shielding cover carefully perform the operation to avoid damaging the FPC Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 19 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 7 Disassembly Procedure 11 Remove the receiver 12 Remove the speaker 2 Disassemble the phone and separate the components from the front cover T
12. Website http www huawei com Email support huawei com Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 1 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual About This Document About This Document Author Maintenance support engineer 2011 11 14 Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 11 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual Contents Contents A DOU I Ms Document anais a A a 11 1 Product Introduccion taeuesseisa veces tenaeeeenstaaamenndeeteae 1 KIADOTT AN O RR a l DA ALI OMS P EEA A A T A E T E E O E EET TA A O E TT EET l 2 Applicable Scope and Precautions ssa a aa A 4 21 APpucable SCOPE sains dto 4 22 Maintenance Pre CaM it ri 4 2 3 How to Obtain Product and Maintenance Information ccccccccccecececceeeeeeseseseeeeececeeeeeeeeeeaeaasesesnseeeseeeeees 4 S EXPLOSIVE Vi Wisin 5 A COMPONENES on FCDA sail sd dida 7 5 Software Uperade nia A A 13 3 Upgrade ico AAA O 13 RN A A a a iavechen toateetdenes 13 DoF PROUD LES HOO UNS aii plis 14 6 Maintenance TOO Sinai 15 7 Disassembly Procedure ii ic 17 S Assembly Procedure iii ill ii aA 25 9 Principles and Troubleshooting aii lot 28 91 Block Diasranrand Phone Introduction nt A A e 29 A II sects seas O O O a 33 9 2 l Power on Management Circula ncaa ction ddan a NS 33 922 E harene Manaisement Circuits aid E E E AE a 37 E A A a 39 DA plas Memory CCU odas ios 40 A A SOS RS A men T E nee
13. Yo TEC q Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 69 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 9 Principles and Troubleshooting The principle of capacitive touch panel is Attaching a layer of transparent metal conductive materials on the glass When the finger touches the touch panel the capacity on the touching point varies which causes the oscillator frequency to vary Then system can obtain the touching position according to the frequency variation As the touch panel module is integrated on the touch panel the main board and touch panel must be connected by a BTB connector The connector can be damaged easily In addition you must power on the touch panel according to the power on sequence First supply the 2 7 V power and then supply the 1 8 V power otherwise the touch panel is disabled When the touch panel is operating the I2C controls data transmission Four touching key fields are added to the U8860 s 4 inch capacitive touch panel and four backlight LEDs for the four keys are added to the touch panel module The definitions of the interfaces for touch panel and MSM8255 and touch panel and PM8058 are as follow VREG_L10_2P7 Touch panel analog power supply 2 7 V VREG_MSM_L20_1V8 Touch panel digit power supply and I O connector power supply 1 8 V e Troubleshooting process Failure The touch panel is faulty Solution Issue 1 0 2011 11 14 Hu
14. is same as that for the primary camera while their data transmission modes are different Troubleshooting process Failure No image can be captured Solution Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 60 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 9 Principles and Troubleshooting Camera failure Is the problem solved after the software is loaded End Is the camera supplied with power normally Pel eee ae Does the camera interface J1902 J1901 have defects such as cold soldered damaged 2 Replace J1902 J1901 lt i Is the problem solved after the camera is replaced End N Replace U201 9 4 11 BT amp WiFi The BT functions are implemented depending on the BCM4329 and the BT data of the MSM8255 and BCM4329 are transmitted by UART and PCM The signal definitions are as follows QTR_BT_UART_CTS The ready to receive information sent to the Slave by the Host QTR_BT_UART_RTS The clear to send information sent to the Host by the Slave Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 61 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 9 Principles and Troubleshooting QTR_BT_PCM_SYNC PCM synchronization QTR_BT_PCM_BCLK PCM clock QTR_BT_HOST_WAKE Waking up the host QTR_BT_EXT_WAKE Waking up the peripherals After the BT module is enabled you can perform BT communication You can know whether the host o
15. oa Niacun 4 DAL Ci Me Call OTE CUI US s2 A spa O E O o cause aaa 44 TAMOS a ia il 44 DEAD K Cyd S aioe a RPDE ARES DS ies ensues denies SDS E UR E AE A DP SRD RD O 46 A DILLON trai act ia a a ts 48 Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 111 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual Contents SAA CO AERECO ON seser ooo iia 49 DA Call SPP A A 50 O AO Headphones RR ECON RPA RR RR ER RREO NR E i 52 JAT OVNI a AA O RO a a a A SAN 54 A E A E E 56 949 microSD Card Connector ui A ted a dee cine ees 57 SEE ET T EEA EIE A PAT E a A EEE A E a a PA E EA 58 OA O OG VD O O naan catateed ddd A 61 OA PT INCCEICTOMIELEE A ate DR END A E 64 DAMAS COMPASS cuota a O RS N 66 DA PA Cry GOS COME A Ai READ O A ER E 68 OA 15 Touch Panelas os RO cta 69 DANA PP CMS CHS OL untada lana 12 10 Solder Points on the PCB and BGA Chip esssssesssoesssoesesoossssossssocsesoesesoosessossesoesssoesssoosssso 75 EL Funcional Festa ds 80 ER A ENS 80 PEZ MME E a A o as 81 MERA A e e A a abet ace ne aman lentes 83 Issue 1 0 2011 11 14 HuaweiProprietary and Confidential do Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 1 Product Introduction Product Introduction 1 1 Appearance 1 2 Specifications Dimensions H x W x D 122 mm x 61 5 mm x 10 9 mm Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 1 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manua
16. reflected by LCD s dynamic backlight adjustment function to a signal and performs computation to control the backlight brightness The signal definitions are as follow LCD analog voltage 2 8 V I O connector digit voltage 1 8 V LVDS signal LVDS signal Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 44 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 9 Principles and Troubleshooting 3 LCD BL DRIVER L1201 PWN 100 200K Hz a Lj gt LED OK Active high len Layout note refer to sp Ea e HS A A The U8860 adopts 4 02 inches LCD The backlight adopts six serial LED lights which are controlled by the backlight LED driving chip RT9293BGJ6 Troubleshooting process Failure The phone can be powered on but its LCD is blank Solutions 1 Ifthe phone displays a black screen it may be LCD backlight fault 2 Ifitis LCD fault refer to the following troubleshooting process Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 45 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 9 Principles and Troubleshooting Display failure Is the problem solved after the software is loaded End Is the connector J1302 cold soldered damaged or distorted Replace J1201 lt Is 41202 Pin2 2 8 V Replace U3900 Is J1201 Pin21 1 8 V Replace U301 Z Z Is the problem solved after the LCD is replaced End N Replace U201
17. the MSM8255 and the T FLASH card SDC4_CMD Control signal After the phone is powered on the system will periodically detect the SD card through the pin of the SD_PWR_EN_N After the SD card is found the system will establish communication with the SD card through the pin SDC4_CLK controls SD card data transmission and clock process The data cable transmits data Troubleshooting process Failure The microSD cards cannot be detected or read Solution Issue 1 0 2011 11 14 Huawei Proprietary and Confidential sf Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 9 Principles and Troubleshooting No SD card is found N Is the SD card Re solder or socket normal replace the SD card socket J1602 Y N Is the SD card s VDD power supply normal Is the power Supply circuit short circuited Is the data transmission circuit damaged or short circuited 9 4 10 Camera Circuit schematic diagram E CAMIF_ ID E CAM VEM PDM VREG CAM F DYDD VCH DDD El CAMERA 1P E SDA G55 CAM DOVOD E CAMERA 1P Po MI GSB CAM CAMIF SHON OUTS mr RESET OUTS NM CAMMIPI NCLK b CAMMIPI PCLE CAMIF_ MCLE o D TA41_N DATAl P Data N D Tio P Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 58 Copyright O Huawei Technologies Co Ltd U8860 Maintenance Manual Issue 1 0 2011 11 14 9 Principles and Troubleshooting CAMIF ID SLAVE CAM M_AvDD CAMERA 1P E
18. 1 PM8058 HSED_BIAS1 and it is used for headphone answer detection U8860 s headphone is compatible with two line sequences The iphone s headphone line sequence is compatible by default Troubleshooting process Failure Perform the test using a normal headphone and no sound is heard Solution Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 32 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 9 Principles and Troubleshooting No sound can be heard from the headphone Does J1301 have defects such as cold soldered damaged or distorted Replace J1301 Is D1301 short circuited ee Replace D1301 Pin3 and Pin6 is ground Is J1301 signal HS DETECT N pin4 normal headphone disconnected high level headphone Replace U201 Are the components on the circuit that between the MIC and U4001 are damaged or short circuited Y Replace the faulty components Replace U4001 Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 53 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 9 Principles and Troubleshooting No sound is picked up or transmitted from the headphone N Is J1301 normal Replace J1301 y N Are the components on Is MSM_MIC_BIAS voltage normal the MIC_BIAS1 circuit are damaged or short circuited Y N Is there signal is input in MIC2N MIC2P when speaker
19. 11 14 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 4 Components on PCBA Bit U1401 U1402 U1701 U2001 U2002 U2101 U3202 U3203 U3301 U3302 U3304 U3401 U3402 U3404 U3501 U3800 U4001 U4003 U4104 U4201 U5002 U5003 U6001 U6002 X401 X402 X701 11 U8860 Maintenance Manual 4 Components on PCBA 12020168 Crystal oscillator 37 4 MHz 10pF 10 ppm 80 ohm 2016 X4101 07040064 Varistor 8 V 4 V 30 V SMT 0405 ESD EMI component Z1301 13030048 Ceramic filter 2450 MHz 2 9 dB 2 0 1 25 1 05 mm ZA201 13010148 SAW filter 2140 MHz 50 V 0023 1804 Z5001 40020162 SDRAM 4Gb LPDDR2 333 MHz 32 bit 1 8 V 240 Ball U201_POP Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 12 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 5 Software Upgrade Software Upgrade 5 1 Upgrade Preparation Upgrade To copy upgrade software environment MicroSD card More than 512 M With at least 30 power remaining Upgrade file Main upgrade pack dload UPDATE APP Vendor upgrade pack vendor XXX XXX UPDATE APP Upgrade method Upgrade using SD cards Normal upgrade Forcible upgrade 5 2 Normal Upgrade Step 1 Format the microSD card Step 2 Create a folder named dload in the root directory of the microSD card Step 3 Copy the upgrade file to the dload folder Step 4 Install the microSD card to the phone Power the phone on and enter 2846579 in the 1dl
20. 20 KHz ringtones It can also play mono audio MP3 files Receiver Driver mode Receiver during a call connection mode receiver component Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 31 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 9 Principles and Troubleshooting Interface circuit The phone has a dual built in MIC to eliminate the connection mode environment noise MIC component Earphone Earphone The phone provides a headphone jack to output headphone interface audio or mp3 The MIC on the headphone cable circuit MIC inputs audio interface circuit Vibrator interface Driver mode When there is an incoming call the vibrator connection mode vibrates vibrator NFC DC interface Performs approach sensing function control Gyroscopes DC interface Realizes the sensing of three directions to perform control the game function Compass DC interface Senses the magnetic field to help indicate the control direction Accelerometer DC interface Acceleration sensing helps perform the game control function Power Internal backup Li ion battery Li ion battery with standard output of 3 7 V 1950 Supply battery interface mAh It is required that the charge discharge Subsystem component lifecycle is over 500 times The battery should pass the following authentication GB18287 safety requirements Li ion battery External power Adaptor and The charger meets the requirements of China sup
21. F failure U201 WCDMA GSMdual mode baseband processor MSM8255T damage results in power on failure system breakdown and RF failure U3501 RF power Esta module and GSM PA NM di damage results in GSM transmission failure and GSM no registration J1201 FPC connector damage results in display failure U3302 RF power module 1920 1980 MHz damage results in W2100 MHz transmission failure TT U3202 RF switch damage results in RF failure ee pi a U3301 SAW filter 1950 MHz damage results in W2100 MHz transmission failure 24201 ceramic filter damage results in Bluetooth and WiFi damage rcsesees U3900 Switching U1401 semiconductor Regulators damage U3404 duplexer Ls sensor results in power on 880 915MHz RX 925 Accelerometer LGA failure 960MHz damage results in W900 MHz a Oa t transmission and failure reception failure nu td sets J1501 card holder connector battery socket 3PIN damage results in power on failure U1402 semiconductor sensor electronic J1602 MicroSD card compass damages holder damage result in compass results in microSD failure card failure J1601 SIM card holder damage results in SIM card failure U3402 RF power U2101 semiconductor failure 880 MHz sensor 3 axis 915 MHz damage gyroscopes results in W900 MHz damages result in
22. GB power consumption file system support DDR2 RAM Memory RAM for program running 2 GB 64Mx32 POP RF Transmission and AFC circuit APC Performs the RF function of WCDMA receiving subsystem receiving of circuit AGC and transmission mainly includes QTR8615 RF WCDMA and circuit each chip and its peripheral circuit GSM DCS component GPS GPS receiving Receives and processes GPS signals mainly including QTR8615 chip and its peripheral circuit BT interface BT module Transmits and receives the baseband function and RF signal of Bluetooth and WLAN mainly includes BT WiFi module and its peripheral circuit WiFi chip Uses BCM4329 chip to perform the WiFi function Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 30 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 9 Principles and Troubleshooting Oscillator and Use crystal Generates highly accurate TCX VCO of 19 2 MHz frequency oscillator instead of local reference clock The QTR8615 embeds LO synthesizer temperature for WCDMA and GPS compensated oscillator Antenna External antenna The phone provides internal antenna for signal internal interface transmission and supports WCDMA high and low component antenna frequency band U8860 92 phone antennas include protection main antenna diversity antenna WiFi BT antenna GPS antenna FM antenna headphone Coupler Power coupler Couples part of the output power of WCDMA power amplifier
23. INT Compass interrupt signal The compass is a three axis Hall sensor Because of the earth s magnetic field the chip generates electricity components on the three axes After three components are processed inside the chip the direction of the earth s magnetic field relative to the chip is obtained Through the DC bus the chip communicates with the main chip Through data processing the main chip can obtain the relationship of the earth s magnetic field direction and the phone position When the compass is operating the compass direction variation is reported to the main chip but in the map program the compass direction is related to GPS As a result the unstable GPS signal may cause compass direction error Troubleshooting process Failure Relevant functions of the compass are disabled Solution The compass direction has a great deviation Is the problem solved after the software is loaded End Is the problem solved after the sensor is replaced Are the components on the sensor s power supply circuit and control circuit damaged or short circuited Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 67 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 9 Principles and Troubleshooting 9 4 14 Gyroscope 2D HM By Eass SDA SDI SDO RES2 SDO SA0 VREG_MSM_L20_1V8 R210 CS DRDY INT2 INT1 PLLFILT I10 gt 1 8V VDD gt 2 8V Using t
24. T A ENE 60 006 00600040 z o a a gt E an napa EN na EM Ea mu Me HHH 60000 60 6806066 00 Ea za ZITA o o Ss 6000000000000 0000 6 6 4 64 6 6 4 6 o a o coa Ss secos a F essen scree no E on LO to ILI o EE See Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 19 Copyright O Huawei Technologies Co Ltd U8860 Maintenance Manual 11 Functional Tests Functional Tests 11 1 Keys Power key Volume Back to the main screen Menu Back Search Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 80 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 11 2 MMI Test On the idle screen after the phone is powered on press 2846579 to enter the MMI test mode Press the Volume key to perform a test Touch the Menu icon to skip the current test and go to the next step Press the Back key to return to the previous test 2 SIM card 2 Testing SIM Check whether the SIM card can be found test card P pa N O Issue 1 0 2011 11 14 LCD backlight test M camera test 0 3M camera test Touch panel test Approach test Environmen t light test 3 Keypad test Testing keys Testing SD card White screen Black screen Color screen Testing LCD backlight functions Testing 8M camera functions Testing 0 3M camera functions Testing touch panel functions
25. V SMT 0402 50pF 1 KHz RV1501 RV2001 RV2002 RV2003 RV2004 39200177 Terminal Dedicated IC Power Management IC of QUALCOMM U301 MSM7x30 Series PM8058 39110531 DCDC charging control chip 20 Pin WCSP U1001 39110523 LED flash driver IC QFN 16 U1102 Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 10 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 38140023 Semiconductor sensor accelerometer LGA 3 axis 38140024 Semiconductor sensor Electronic compass WL CSP pb free 3 axis 40060276 NAND FLASH 4GB EMMC V4 4 52 MHz 1024 KB Audio amplifier 2 5 V 5 5 V differential Micro SMD 9pin pb 39080127 free BGA 47100307 RF power module 824 849 MHz 880 915 MHz 1710 1785 MHz 1850 1910 MHz 39110552 Switching Regulators 0 4 3 4 V 39200249 Terminal dedicated baseband IC WCMDA GSM Radio Transceiver QTR8615 39110626 Switching Regulators LED Driver 39200222 Single Band 2 4 GHz WLAN Bluetooth 2 1 FM single chip BCM4329 2 3 5 5 V WLBGA182 pb free 47090037 13010176 SAW filter 2140 MHz 1 9 dB 1 4 1 1 mm 13010264 SAW filter 1590 16 MHz 1 8 dB 50 V 1411 47090042 RF low noise amplifier 1 5 G 3 GHz 15 dB 1 1 dB QFN 200 V RF low noise amplifier 0 5 3 GHz 16 8 dB 0 87 QFN 250 V 12020141 mm 12020125 Crystal oscillator 0 032768 MHz 12020162 Crystal oscillator 24 576 MHz 12 pF 30 ppm 100 ohm 3225 Crystal oscillator 19 2 MHz 7pF 10 ppm 70 ohm 3 2 2 5 0 6 Issue 1 0 2011
26. X401 has no outputs or its output frequencies are unstable Solution Replace X401 Description of the signals in the circuit diagram in this section Form XTAL_19M Output from the 19 2 MHz OUT main clock IN clock XTAL 19M Input to the 19 2 MHz main E 9 2 4 Flash Memory Circuit The MSM8255 0 is able to visit the LPDDR2 through two high speed buses EBIO EBI1 The LPDDR2 is connected to the MSM8255 0 in PoP Package on package mode Meanwhile the MSM8255 0 also can visit the external storage eMMC through a low speed bus EBI2 as shown in the following figure Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 40 Copyright O Huawei Technologies Co Ltd U8860 Maintenance Manual 9 Principles and Troubleshooting 128 MB LPDDR2 gt 296 MB MSM8x55 0 digital die Flash 9 3 RF Unit The power supplies of the RF unit are as follows VREG S2 1V35 Al Supplies power for QTR8615 VREG S4 2V2 Supplies power for QTR8615 Troubleshooting process Failure The phone cannot initiate a call or be called Solution Maintenance procedure for transmission failure in W2100 W900 GSM900 and GSM1800 Maintenance procedure for transmission failure in W2100 Firstly ensure that the SIM card and antenna are installed properly and then detect the phone according to the following procedure Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 41 Copyright Huawei Technologies Co Ltd U8860 Maint
27. ain board II o 9 Paste the FPC on the main board and ensure that the l l FPC aligns the positioning hole 10 Insert the FPC into the ZIF interface Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 26 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 8 Assembly Procedure 2 gt a MA hee TT man 7 a et HDAUBISN AT a N Eis sem Im aime wi 0 usar gt Y cu ys oe A LAVO TECHNOLOGIES CO LTD 12 Install cover B EMOBILE 71H GS02 RESUME a NON PU RI 1 mn TT 1110 aa TA AY tes d CE06820 9 XO A O 2 HUAWEI 13 Install the six crews in cover B 16 The U8860 is now assembled 15 Install battery cover Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 27 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 9 Principles and Troubleshooting Principles and Troubleshooting Before repairing a phone ensure that the failure of the phone is not caused by environmental factors or incorrect functional settings it is recommended that you restore the phone to its factory defaults Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 28 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 9 Principles and Troubleshooting 9 1 Block Diagram and Phone Introduction EXTERNAL POWER Bad t CHARGER 19 2MHz Antenna switch OPT t Y t Interface Matchi
28. an advanced service site for repair Huawei Proprietary and Confidential 83 Copyright Huawei Technologies Co Ltd
29. at http www huaweldevice com cn technicalndex do Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 4 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 3 Explosive View Explosive View List of components in the explosive view drawing Note The components listed in the following table are structural parts of the phone and cannot be used as reference when applying for spare parts U8860 touch panel U8860 receiver decorating items Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 5 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 3 Explosive View CC CO Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 6 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual J1502 IO connector Mini USB type B socket damage results in charging failure and data communication failure MIC601 MIC damage results in call transmission failure X701 crystal oscillator 24 576 MHz damage results in LPA Low power audio failure and power on failure U1701 NAND FLASH 4GB EMMC damage results in power on failure and software failure U4003 LED Driver damage results in LED backlight failure U203 Switching Regulators damage results in power on failure U6002 RF low noise in GPS failure U2001 audio amplifier failure U5003 SAW filter 2140MHz receive diversity damage results in
30. awei Proprietary and Confidential 70 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 9 Principles and Troubleshooting The touch panel functions are disabled Is the problem solved after the End software is loaded Is the problem solved after the touch panel connector is re End fastened Is the problem solved after the touch panel connector is replaced Is the problem solved after the FPC is replaced End Are the components on the touch panel s power supply circuit and control circuit damaged or short ircuited Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 71 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 9 Principles and Troubleshooting 9 4 16 Approach Sensor U1101 TMD27T1 gt VREG_L10_2P7 S I2C_5CL_HW DC SCL HW DC bus DC SDA HW PRO INT Three in one interrupt signal The approach sensor has two functions One is for screen brightness adjustment The other is for misoperation prevention If you select automatic adjustment the system will enable the approach sensor s environment light detection function to detect the brightness of the environment light and then adjust the screen brightness accordingly The approach sensor realizes the approach status of the phone and other objects depending on the internal infrared sensor If the approach status achieves a certain threshold the system will shut down
31. components Are all channels of output voltage of the PM U301 normal refer to the PM voltage output table N Replace U301 Is the problem solved after U1701 is replaced eng Replace U201 PM voltage output table Reference Value for the Output Voltage Test Point VREG_L3_1P8 3P3 1 8 3 0V C449 VREG_CAM_2P85 2 85 V R4411 VREG_MSM_A2 2V05 2 85V C456 Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 35 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 9 Principles and Troubleshooting Signal Reference Value for the Output Voltage Test Point VREG_L11_1P8 1 8V C458 VREG LIA 2P85 cam VREG MSM QFUSE PRG 1 8V C445 VREG MSM L20 1V8 1 8V C441 VREG_MSM_MPLL LIV C466 VREG_SO_1V1_Cl LIV C418 VREG_51_1V1_C2 LIV C450 VREG S2 1V35 Al 1 3V C447 VREG_S3_1V8 1 8V C424 Excessive current DC power supply There are two types of excessive currents Excessive current occurs after the Power key is pressed The phone has current greater than 1 mA when it has been powered off Excessive current is caused by short circuits The main reason is ground short circuits of VBAT Issue 1 0 2011 11 14 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 36 U8860 Maintenance Manual 9 Principles and Troubleshooting Power on failure excessive current Are th Is the VBAT ground short circuited components short circuited
32. cted When you cover the approach sensor with hand the number displayed on the LCD should be around 10 81 Copyright O Huawei Technologies Co Ltd U8860 Maintenance Manual 11 Functional Tests Step Test Method and Precautions Vibration Testing the If the motor vibrates continuously the test succeeds motor functions test Press the Volume to perform the next test Speaker test 12 Testing the If music 1s heard from the speaker the test succeeds speak Press the Volume to perform the next test function Mobile phone MIC loopback test pd Oo Testing the Press Record speak at the MIC and then press Play If the MIC recorded voice is heard from the receiver the test succeeds functions Perform master MIC test secondary MIC test dual MIC test and then perform headphone loopback test Connect the headphone press record speak at the headphone MIC and then press play If the recorded voice is heard from the headphone receiver the test succeeds Press the Volume to perform the next test P Testing FM Search FM channels if program voice is heard the test functions succeeds Press the Volume to perform the next test 5 Testing the According to the prompt first disconnect the headphone and headphone reconnect the headphone then the In icon should turn green cable Then disconnect the headphone the Out icon should turn green Press the Volume to perform the next test p 6 Test
33. e screen Select SD card upgrade then press Confirm to start the upgrade Step 5 Before the upgrade NV items backup is performed if the phone has not been backed up before Then the phone restarts and the upgrade starts Step 6 The upgrade progress is displayed on the LCD Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 13 Copyright O Huawei Technologies Co Ltd U8860 Maintenance Manual 5 Software Upgrade Unpacking Installing Update Complete The full update will take approximately 2 minutes Do mot turn off the device Do not turn off the device Hesta rting Stepi step steps Step 7 After the upgrade is completed the phone restarts and the NV items are restored Step 8 After the main upgrade pack is upgraded upgrade the vendor upgrade pack using the same upgrade methods End If the phone cannot be properly powered on follow the following two methods to forcibly upgrade the phone e Install the battery to the phone if the screen is splashing remove the battery and wait for five seconds before installing the battery again Press Volume and Volume and press Power key the phone will start SD forcible upgrade The specific download process is similar to the project menu download e When the phone is not installed with a battery Press Volume and Volume and connect the phone to a charger the phone can also start the SD forcible upgrade It 1s recommended that you use charger to perf
34. echanical structure of the accelerometer detects the accelerometer position The position is reflected as the three axis electric charge amount inside the accelerometer The voltage conversion device for the internal electric charge converts the voltage to voltage signal and amplifies it Then the amplified signal is converted to digit signal through the 12 bit ADC and is transmitted to the chip s DSP for data processing The interrupt signal and data signal are outputted for data transmission with the main chip Troubleshooting process Failure Relevant functions of the accelerometer are disabled Solution Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 65 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 9 Principles and Troubleshooting Relevant functions of the accelerometer are disabled Y Is the problem solved after the software is loaded End N Y Is the problem solved after the End accelerometer is replaced Are the components on the accelerometer s power supply circuit and control circuit damaged or short circuited 9 4 13 Compass Circuit schematic diagram VREG MSM_L2O_ 18 COMPASS INT lt a Joc SCL HW AS YREG_L10_2P7 es Le SDA HW D4 VREG_MSM_L20_1Ys NC pd DC SCL HW DC bus Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 66 Copyright O Huawei Technologies Co Ltd U8860 Maintenance Manual 9 Principles and Troubleshooting COMPASS_
35. enance Manual The transmission channel in W2100is faulty Are U3201 Pin 1 and Pin 2 connected when the RF cable is not connecting Is U3202 s switch control signal is normal The truth table is the note table 1 Is U3302 s PA output in W 2100 normal Is U4001 s IQ signal normal Is the power voltage normal Y Check U201 In W900 just replace the U3302 detection with U3402 detection Z 9 Principles and Troubleshooting Check U3201 Check U3201 and U201 Check U3402 Check U4001 In GSM900 and GSM1800 just replace the U3302 detection with U3502 detection Maintenance procedure for reception failure in W2100 Issue 1 0 2011 11 14 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 42 U8860 Maintenance Manual 9 Principles and Troubleshooting The reception channel in W 2100 is faulty Are U3201 Pin 11 and Pin 8 connected when the RF cable is not connecting Is U3202 s switch control Check U3201 and signal normal The truth U201 table is the note table 1 Are the signals of U3404 Pin 1 and Pin 8 normal the difference is less than 2 3 db Is U4001 s IQ signal normal Is the power voltage normal Check U201 Note Check the control signals of U3202 switch using a multimeter or oscilloscope The truth table for control signals is as follows Note table 1 In W900 just re
36. ential 63 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 9 Principles and Troubleshooting 9 4 12 Accelerometer Circuit schematic diagram Accelerometer 01401 NC BYP ACCE INT INT1 T2C_SCL_H SCL SPC SCLK INT ACCE INT es 120 SDA HW SDA SDI SDO ADC 1 GND NC ADC2 RESERVED HC SDO SAD ALT_ADDRESS ADC3 GND HC VREG L10 2P7 E CSFOS NC RES GND NC VREG MSM L20 1W8 gt o REG Lig 2P7 cOPTO TORTO EOPTO NOOT NOOT I2C_SCL_HW I2C bus DC SDA HW ACCE INT Accelerometer interrupt signal ACCE_INT2 Accelerometer interrupt signal sleep Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 64 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 9 Principles and Troubleshooting Analysis X axis INT1 OSC GEN VDD lt gt Transducer VDDIO DX Embedded X SDA VSS E DSP a Functions pd SCL Freefall Transient Orientation with Shake Detection Single Double Detection through and Motion Set Hysteresis amp Directional Tap Motion i e fast motion Detection jolt and Z lockout Threshold Detection Auto WAKE Auto SLEEP Configurable with debounce counter and multiple motion interrupts for control MODE Options ears Options Low Power ow Power PA ACTIVE Mode ACTIVE Mode Low Noise Power High Resolution Auto WAKE SLEEP SLEEP High Resolution Normal Normal Figure 1 Block Diagram Firstly the internal micro m
37. es can be provided by PM8058 internally TCXO driver and The PM8058 has a built in TCXO driver two other controls channel analog signals and two channel data signal output UVLO Low voltage power off function When the input voltage is lower than the threshold for a specific period the phone powers off Supports WDT counter overflow reset function Over temperature When the on chip junction temperature exceeds protection 150 C the phone powers off Internal driver Provides four LED drivers one vibrator driver and circuit one speaker driver Interruption PM8058 has a built in interruption manager to management process related interrupted signals USB driver Supports USB 2 0 and A B interface type and does not support OTG function 9 2 Baseband Unit 9 2 1 Power on Management Circuits Power on failures are classified into three types no current weak current and excessive current Many failures are caused by abnormal power supply If these types of failures occur troubleshoot them according to the circuit fault troubleshooting methods Troubleshooting Process To troubleshoot the power on failure firstly check whether the I O connector battery connector 1s damaged If the I O connector battery connector is not damaged use a DC regulated power supply to supply the phone with power and test the faulty phone current The power on failure may be caused by any of the following conditions e No current DC power sup
38. he faulty components Are the components on the reception circuit normal Z Z Y Replace U4001 9 4 5 Call Transmission Troubleshooting process Failure No sound is heard by the other party during a call Solution Check whether the phone is set properly Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 50 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual After a call is established no sound can be heard by the other party Is the problem solved after Y the software is loaded End N Is the MSM MIC BIAS 128V Check U301 voltage 1 8 V Is the problem solved after the MIC is replaced Are the components on the circuit that between the MIC and U4001 are damaged or short circuited Issue 1 0 2011 11 14 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 9 Principles and Troubleshooting 51 U8860 Maintenance Manual 9 Principles and Troubleshooting 9 4 6 Headphone Circuit schematic diagram rh ro 151301 3 5mm E G RL 99050LKM 1151502 DT 9081 IF acc E The headphone connect status is identified according to the HS_DETECT_N GPIO_026 Before connecting the headphone HS_DETECT_N is pulled up to high level by VREG_MSM_L20_1V8 After connecting the headphone HS_DETECT_N is dropped down to low level by the resistor R902 The headphone MIC is supplied with power by MIC BIAS
39. he main FPC does not have to be separated 3 Separate the BTB that the touch panel connects to main FPC and lever the part of the main FPC that blocks the TP BTB 1 Introduction to the disassembly tools Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 20 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 7 Disassembly Procedure 4 Put the front cover components into the jig base The placing direction is as shown in this Figure See procedure 4 1 and 4 2 for precautions Fo 4 2 Note Do not press TP BTB 5 Fasten the cover Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 21 Copyright O Huawei Technologies Co Ltd U8860 Maintenance Manual 7 Disassembly Procedure 6 Tighten the two screws Note The screws lie in the 7 Put the sucker in the middle of the TP Icon and press position where the sucker sucks the TP BTB the sucker tightly 7 1 Note Put the sucker in the opposite direction of 8 Slowly suck up the TP and stop sucking until half of the receiver the TP 1s sucked up Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 22 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 7 Disassembly Procedure on 8 1 Note Slowly suck the TP because the FPC of the 9 Remove the sucker Note the TP will easily be TP BTB will be broken if the TP is sucked up too fast removed by opening the sucker edge with your finger
40. he same power BC SDA HW OOO SDA_HW The gyroscope s internal architecture is as follows Figure 1 Block diagram CHARGE MIXER LOW PASS AIP FILTER 0 2 0 mar Tn T E Mi P E R A U R E INTA TRIMMING CLOCK CONTROL LOGIC REFERENCE amp amp CIRCUITS PHASE GENERATOR INTERRUPT GEN DADY INT2 AMO7225v1 The gyroscope s core is a dipole When the gyroscope is working the core vibrates on the three axes directions If the phone rotates because of the Coriolis force the rotation will be Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 68 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 9 Principles and Troubleshooting reflected as the variation of the corresponding electric signal of the internal circuit After processing the result you can obtain the rotation direction Troubleshooting process Failure Relevant functions of the gyroscope are disabled Solution The gyroscope functions are disabled Is the problem solved after the software is loaded Is the problem solved after the gyroscope is replaced Are the components on the gyroscope s power supply circuit and control circuit damaged or short circuited 9 4 15 Touch Panel e Touch panel s circuit unit is a module fixed inside the touch panel Its interface circuits are as follows as 120 SDA HW lt E L20 1V8 E TOUCH INT gt 5 gt OVREG LO 2P7 B TOUCH RESET la
41. ing BT Check whether the BT functions are normal If a BT device is functions found the test succeeds Press the Volume to perform the next test Note A terminal with BT function enabling is required to assist this test Gravity sensing test pad a a pd OO pre Testing Move the phone to ensure that the phone exists in a gravity three dimensional space If the phone and the X Y and Z plates sensing at an angle of 45 degrees respectively the test succeeds functions pad Testing If the compass is immobile sway it compass functions Compass test WIFI test The MMI test is complete and the test results are displayed on the LCD p lt 9 Testing WiFi If signal is received normally the test succeeds functions Note A terminal with WiFi function enabling is required to assist this test 15 Headphone cable control test Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 82 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 11 Functional Tests 11 3 Voice Call Test Issue 1 0 2011 11 14 Install a UIM card and battery to the phone Press the power key to Power the phone on Check whether the signal strength displayed on the LCD is normal Make a call to a fixed line phone and check the voice quality during the call If no problems are found during the test finish the voice call test If any problems are found troubleshoot the phone or send it to
42. l 1 Product Introduction Descriptions WCDMA HSDPA HSUPA 3GPP FDD Release 7 Band WCDMA 2100 MHz 900 MHz GSM 850 MHz 900 MHz 1800 MHz 1900 MHz About 140 g with battery SIM USIM Standard 6 pin SIM card supporting 1 8 3 V USIM card Battery 1930 mAh Talk time 400 minutes 3G Camera Primary Camera 8 MP AF HD Secondary camera 0 3 MP FF Display Resolution 854 x 480 FWVGA Type TFT LCD standby time 380 hours 3G Connectors Charger port Storage space ROM 4 GB the available space is about 2 5 GB RAM 512 MB the available space is about 300 MB Maximum transmit power WCDMA 2100 MHz 900 MHz 24 dBm Power Class 3 GSM 850 MHz 900 MHz 32 5 dBm Power Class 4 GSM 1800 MHz 1900 MHz 29 5 dBm Power Class 1 EDGE 850 MHz 900 MHz 26 dBm 3 dBm EDGE 1800 MHz 1900 MHz 25 dBm 3 dBm Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 2 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 1 Product Introduction Static sensitivity WCDMA 900 MHz better than 103 7 dBm 3 84 MHz WCDMA 2100 MHz better than 106 dBm 3 84 MHz GSM 850 MHz better than 102 dBm 200 KHz GSM 900 MHz better than 102 dBm 200 KHz DCS 1800 MHz better than 102 dBm 200 KHz PCS 1900 MHz better than 102 dBm 200 KHz Temperature Operating temperature 10 C to 45 C without charger Storage temperature 40 C to 70 C Operating humidity 5 to 95 RH Issue 1 0 2011 11 14 Huawei Prop
43. mode is power saving mode standby mode without charging Troubleshooting process There are two types of common charging failures e The phone has no response after a charger is connected to it e The phone displays an animated icon indicating that it is charging but actually the battery is not charged To troubleshoot charging failure firstly check whether the battery connector is damaged Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 38 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 9 Principles and Troubleshooting Charging failure Is J1502 cold soldered damaged or distorted Replace J1502 Is the voltage of J1502 Pin1 Santa Replace J1502 abou Is F1501 connected Replace F1501 s the Q301 pin voltage Vs Pin2 approximate to Vd Pin3 Replace Q301 Is the output voltage of the charging IC 3 7V 4 2V Replace U1001 Zz Z lt Y Replace U301 9 2 3 Clock Circuit Clock Effect VCTCXO in 19 2 MHz Supporting master clock for the MSM8255 Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 39 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 9 Principles and Troubleshooting 32 768 K crystal for platform MSM8255 sleep clock signal use BT amp WiFi in 37 4 MHz BCM4329 clock BCM4329 Troubleshooting process Failures The phone cannot be powered on or frequently freezes X401 s test result shows that
44. ng Matching Duplexer Duplexer A dad IDE KEY Power GSM mo O PMBOS8 UMTS KEY BACK LIGHT Control GPIO STATUS TR8615 Q Interface men ower Ema el ever o IQ amp control o hm po Duo fe TQ amp control EM BCM4329 MA Fr MSM8255 G SENSOR GYROSCOPE PROXIMITY AMBIENT cm q NEC sm eMMC AMBIENT COMPASS MODE Man OPTION Main Antenna f Connec tor Diversity Antenna Filter LNA Filter GPS Antenna Antenna switch y SAW WLAN amp BT Antenna MSM8255 is the baseband signal processing chip mainly performing the signal input and output of IMAGE VIDEO AUDIO RF INTERFACES CONECTIVITY The baseband interface provides interfaces of keypad LCD SD card Bluetooth camera and MIC PM8058 provides analog multi channel switch real time clock circuit TCXO clock circuit motor driver circuit and programmable current source The QTR8615 is the RF signal processing chip performing the uplink and downlink RF signal conversion According to logic functions boards are categorized into four sub systems including baseband RE power supply and user interfaces The following table describes modules and units of each sub system and sup
45. orm forcible upgrade If the download still fails replace the SD card and try forcible upgrade again 5 3 Troubleshooting Failed to upgrade 1 Check whether the upgrade file is correct the phone using the microSD card 2 Check whether the upgrade method is correct 3 Check whether the microSD functions properly 4 Perform the upgrade again Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 14 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 6 Maintenance Tools 6 Maintenance Tools constant temperature heat gun to heat components constant temperature heat gun to heat components soldering iron to maintain and solder components DC regulated power supply to supply DC current soldering table to secure the main PCBA Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 15 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual Issue 1 0 2011 11 14 Name pb free solder wire Usage soldering Name digital multimeter Usage to measure during repair Name toolkit Usage to assemble and disassemble components Name electric serewdriver Usage to fasten and remove screws Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 6 Maintenance Tools 16 U8860 Maintenance Manual 7 Disassembly Procedure 7 Disassembly Procedure 1 Ensure that the ESD wrist strap is well grounded 2
46. place the U3404 detection with U3804 detection In GSM just replace the U3404 detection with U3304 detection Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 43 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 9 Principles and Troubleshooting 9 4 Peripheral Circuits 9 4 1 Display The MSM8255 employs the MDDI interface to transmit command and data to the LCD The U8860 uses Toshiba s LCD The U8860 uses Toshiba s LCD LTO4O0MDT9000 It is a TFT module with a point matrix of 480RGB x 854 supporting MDDI interface Its features are e 16 7 M colors TFT LCD module e Display mode RGB Stripe The schematic diagram of the MSM8255 and LCD interface is as follows Pind use GPIO for IDO consider the PM MPP pin Modify to 2 8V VREG L16 2P8 ee LED gt BSp C1221 Ss LCD RESET A MDP _VSYNC ___ s Ls MDDI DN MDDI DP es MDDI SP MDDI SN S MDDI DN DATA1 MDDI DP DATA1 3 E RE 2 E 1 VREG_L12_1P8 lt gt PSTOSBI DA lt D1202 lt LED sl o Q oO The U8860 s LCD employs the MDDI type2 interface It requires only two pairs of low voltage differential signal LVDS cables and a pair of power cables and supports 60 Hz refreshment rate With frame synchronization function the LCD uses MDP_VSYNC of GPIO 030 as the data transmission synchronization signal to avoid LCD breakage A diode composes the PWM signal pull up reflected by environment light detection and the PWM signal
47. ply Generally no current may be caused by any of the three reasons No power supply channel is set up or the components in the power supply channel are damaged or fall off The main components are cold soldered therefore the system does not operate normally In this case the current 1s less than 100 mA Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 33 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual Issue 1 0 2011 11 14 9 Principles and Troubleshooting The relevant circuits of the power key are faulty which results in power on failures Power on failure no current N Is the battery connector J1501 Replace J1501 connected properly Y N Is the FPC normal Replace the FPC Y Is the connector J1302 cold soldereo Y Replace J1302 damaged or distorted Re solder or replace U301 Weak current DC power supply Generally weak current may be caused by any of the two reasons Software faults Upgrading or reloading the software may solve the problem The PM output circuit is short circuited Huawei Proprietary and Confidential 34 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 9 Principles and Troubleshooting Power on failure weak current Y Is the problem solved after the End software is loaded N N Are the X401 19 2MHz output and X402 32 768KHz output normal Replace the faulty
48. ply travel interface Europe the USA and Australia 90 240 V 45 55 charger component Hz AC input The model differs with different markets The output voltage of the charger is 5 0 25 V The charger must pass CE and CCC authentication The output current of the charger should be able to charge the battery and support the normal operation of the phone at the same time The charging current requirement is 1 A Power distribution Power distribution It includes filter networks and cabling of the power network and network supply ower Sea ene Backup battery It manages battery charging and discharging management overcharging and over discharging protection The charge circuit battery that maintains RTC current can also be charge mode and charged charge protection function Board circuit power It mainly indicates LDO which manages power management supply flexibly Based on protocols and power save power on off analysis requirements the board software manages analysis the power supply of unit circuits according to service status to decrease power consumption of devices A 32 768 KHz sleep clock is provided Issue 1 0 2011 11 14 Huawei Proprietary and Confidential o pu Copyright O Huawei Technologies Co Ltd U8860 Maintenance Manual 9 Principles and Troubleshooting PM8058 enhanced RTC It has a built in RTC circuit and uses a sleep clock function of 32 768 KHz that provides precise time HKADC The 12 MPP interfac
49. ported functions Issue 1 0 2011 11 14 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 29 U8860 Maintenance Manual 9 Principles and Troubleshooting Baseband MSM8255 Modem subsystem As a MODEM processor the ARM11 is 400 MHz subsystem performing the modulation and demodulation of WCDMA GPS and GSM The subsystem includes ARM11 processor modem DSP modem AHB bus interruption controller and sleep controller Application The Scorpion processor is 1400 MHz supporting subsystem function modules such as microSD card EBD UART USIM DC GPIO and clock The subsystem includes ARM11 processor application DSP and dedicated data mover User interface Camera interface PCM interface broadband processing unit CODEC Vocoder RF interface HKADC LCD interface SD interface USB interface UART interface USIM card interface SBI interface GPIO JTAG ETM interface and keypad interface Multimedia and The multimedia and game engine of the MSM8255 game engine runs Mpeg jpeg hardware engine and game engine JAVA accelerator and provides MP3 MMS MIDI functions Environment Power supply Lists monitoring targets such as external power monitoring voltage monitoring input battery button battery VDD phone and PM8058 important LDO Temperature Battery temperature PA temperature and 19 2 monitoring MHz crystal oscillator temperature EMMC feature Stores programs and NV items 4
50. r peripherals is woken up based on QTR_BT_HOST_WAKE or QTR_BT_EXT_WAKE The signal interfaces of QTR_BT_UART_TXD and QTR_BT_UART_RXD control data transmission determining to receive or transmit data QTR_BT_UART_CTS and QTR_BT_UART_RTS transmit status signals and you can know the BT status according to these two pins Data transmission 1s performed by the four pins of PCM The Wifi functions are implemented depending on the BCM4329 the communication of the MSM8255 and BCM4329 adopts the SDIO bus of the SDIO3 interface The signal definitions are as follows SDC3_DATA3 Data line SDC3_DATA2 SDC3 DATAI SDC3 DATAO SDC3 CMD Control signal After the WiFi function is enabled the data transmission 1s controlled by SDC3 CLK and SDC3 CMD and is performed by the four data control pins Troubleshooting process Failure the BT and WiFi functions are abnormal Solution Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 62 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 9 Principles and Troubleshooting The BT amp WiFi functions are abnormal Is the problem solved after the software is loaded End Is the problem solved after the BT antenna and BT antenna spring are reinstalled End Is the problem solved after the Y Eid BT antenna is replaced N Is the cabling between the antenna and U4201 damaged or short circuited Issue 1 0 2011 11 14 Huawei Proprietary and Confid
51. rcuit schematic diagram VPH_PWR lb GTOZA Yq TOOZA NI o VIB DRVN Analysis The PM VIB DRV N controls the vibrator s driving voltage The VIB DRV N controls the motor vibration by setting high level or low level When the VIB_DRV_N is in low level the motor vibrates Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 48 Copyright O Huawei Technologies Co Ltd U8860 Maintenance Manual 9 Principles and Troubleshooting Troubleshooting process Failure The motor fails to vibrate Solution Vibration fault Re solder the motor Is the motor normal Does the motor vibrate after the motor s two ends are added with 3 V power Replace the motor Does the keypad FPC have defects such as damage or fold Replace the FPC Replace U301 9 4 4 Call Reception Troubleshooting process Failure After a call is established no sound can be heard or noises are heard Solution For audio fault check whether the phone is set properly Generally the reception faults are caused by earpiece fault or poor earpiece contact Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 49 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 9 Principles and Troubleshooting After a call is established no sound can be heard Is the volume set normally Reset the volume Replace the Is the resistance of the receiver l receiver N Replace t
52. rietary and Confidential 3 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 2 Applicable Scope and Precautions Applicable Scope and Precautions 2 1 Applicable Scope This document provides maintenance instructions for technicians at service centers authorized by Huawei This service manual is confidential and can be accessed by authorized service sites or companies only Although every effort has been made to ensure the accuracy of the document errors may still exist If you find any error or have any suggestions please contact Huawei s customer service center 2 2 Maintenance Precautions e Only qualified technicians are allowed to perform the repair and calibration e Perform all operations in electrostatic discharge ESD rooms and wear electrostatic wrist straps throughout the operations e Ensure that all the components screws and insulators are properly installed after repair and calibration Ensure that all cables and wires are installed and connected correctly e Ensure that the soldering is pb free and compliant with the environmental friendly requirements ESD is the major cause of damages to electrostatic sensitive components so every service center must pay high attention to avoid ESD discharge and comply with the ESD protection requirements of this manual 2 3 How to Obtain Product and Maintenance Information To obtain relevant product and maintenance information you can visit Huawei website
53. the screen forcibly to prevent it from misoperation The DC bus controls the approach sensor components and data transmission The interrupt pin provides the interrupt signal The approach s internal structure is shown in the following figure Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 72 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 9 Principles and Troubleshooting VDD 12C Interface Upper Threshold Za Lower SCL Upper Threshold Pros i E Detect Data Lower Threshold LED Regulated Constant Current Sink LED K LDR GND The CHO CH1 receives environment light and generates environment light value by processing the data internally Then the system automatically adjusts the LCD brightness according to the environment light value The approach sensor is to prevent the phone from misoperations caused by the contact of the face and touch panel As a result if the inferred emitted by the LED inside the chip is blocked 1t will be reflected Then the sensor will receive the reflected light through the photodiode and identify the obstacle position When the approach status achieves a certain threshold the system triggers the operation to shut down the touch panel Troubleshooting process Failure The approach sensor is faulty Solution Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 73 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual
54. to QTR8615 for power monitoring User UART interface The UARTI interface of the MSM8255 subsystem interface is used for Bluetooth and the UARTS3 is used for subsystem testing USB interface Driver protection Indicates the peripheral circuits of USB interface in circuit output MSMB8255 subsystem and unit circuits such as interface protection circuit and interface connectors It is the component major data service channel for the engineering sample and can be used to debug and test devices during R amp D USIM card Power supply Mainly includes USIM card holder and related interface protection circuit connection circuits USIM card holder Keypad and Keypad driver Supports GPIO for keypad scanning and provides backlight circuit external backlight LED When a key is pressed the keypad backlight backlight is on By connecting with PM8058 it LED control circuit provides brightness adjustment function Color LCD and LCD driver The main LCD is of 16 mega colors The brightness backlight interface mode and of the LCD backlight can be controlled by users backlight control TEMMC card Power supply Mainly includes TEMMC card connector and protection circuit related interface circuits connector Speaker that Driver mode The power of the speaker that plays polyphonic plays back MIDI connection mode ringtones when there is an incoming call can be 500 speaker component mW It has sound frequency function that can play back 20
55. uawei Technologies Co Ltd U8860 Maintenance Manual 10 Solder Points on the PCB and BGA Chip Partial amplified figure 04 040 00640000000000000040000000000 S eGCCCCECECECHC 6446664604 4644 666 00060 600 TE 6050000004 060060060 646555 66 6 6 04040400 4444044 646 446 6006 0600460046 00464066 4600460006 00460046 26 666666666666660666 eeeeebeeeceeeeeeaees RRR ERE RRR RRR ER RRR RSE SERENA 6 6606666666606066606066 eeeececeeeeceeeeaeaeces o66606666606666666460066 60 640600060600 F0000600000 4466004600 7600440066 E 86660606680666660686866 56 oe Se amp B egoaegee onueeenneeeen B g 5004060004040 240020004040 40004 o COCO CUCA 06 604660546 D000454 ee co 0006060000060 ts 01040600040640004060094 15606006060 006060094 EE o 600 60640648005 44404040004 e 5600006 06000000000 o 060004644 466 446666 5604 0006 0606 06000000004 106000 000600000000061 oo ee 50460 0660606060 00600060000000000 54606 Cosas asa o eee oa eo Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 78 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 10 Solder Points on the PCB and BGA Chip TETTEIT TTT TELIKILIELI S LLZ 64400000 o 0 900 D a 6 ee Je e e 00666 60600 2 e po Pe eee A 5008060 64060060000 tpo 8086886686 o ee se oe so 000 a EE EES 5600000000004 066 646 6606 a 7 e spd ias be praga led e ee 66 600000 TR
56. weak W2100MHz signal J1302 BTB connector damage results in power on failure TP failure motor vibrating failure speaker soundless and approach light failure Issue 1 0 2011 11 14 U6001 SAW filter amplifier damage results damage results in GPS damage results in audio gt fee Es eau a na ess Huawei Proprietary and Confidential Copyright O Huawei Technologies Co Ltd 4 Components on PCBA Components on PCBA U1001 headphone jack damage results in charging failure X401 crystal oscillator 19 2 MHz damage results in power on failure U4201 Single Band 2 4 GHz WLAN Bluetooth 2 1 FM single chip BCM4329 damage results in Bluetooth WiFi and FM failures U4104 RF switch 0 5 3 0 GHz damage results in Bluetooth and WiFi failures X4101 crystal oscillator 37 4 MHz damage results in Bluetooth WiFi and FM failures U4001 WCMDA GSM dual mode RF transmission and reception QTR8615 damage results in RF failure and audio failures X402 crystal oscillator 0 032768 MHz damage results in power on failure U301 power management chip PM8058 damage results in power on failure U5002 RF low noise amplifier receive diversity damage results in weak W2100MHz signal U8860 Maintenance Manual 4 Components on PCBA U3201 RF connector damage results in RF failure J3201 J3203 master antenna contacts damage results in R
57. y and Confidential 55 Copyright Huawei Technologies Co Ltd U8860 Maintenance Manual 9 Principles and Troubleshooting 9 4 8 I O Connector Circuit schematic diagram BATI IFHE TEST as ALS A a ek TRE THERE 21505 1 BATI_TERF o WHAT Trace of TEMP TEST be wide GTS IT SOLS Sed Analysis When a charger connected to the I O connector USB connector the charger provides charging voltage to charge the battery When the phone is connected to a computer using a USB cable USB_DM and USB_DP are used for communication for upgrading the phone s firmware reading information from the phone between the phone and the computer Troubleshooting process Failure The phone cannot be charged or detected by a computer Solution Clean re solder or replace the USB connector Description of the signals in the circuit diagram in this section Reference Measurement or Wave Form VEXT_DC Charging current input High level 5 V do BR g USB DP Digital signal Issue 1 0 2011 11 14 Huawei Proprietary and Confidential 56 Copyright O Huawei Technologies Co Ltd U8860 Maintenance Manual 9 Principles and Troubleshooting 9 4 9 microSD Card Connector Circuit schematic diagram VREG MSM SD J1602 475792245 SDC4 DATA R1604 es SDC4_DATAS R1605 es SDC4_CMD R1606 Es SDC4_CLK R1607 SDC4_DATAO R1608 FED DA sDC4 DATA R1609 TF_DETECT lt lt VREG_S3_1V8 The SDIO4 connector is adopted to connect

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