Huawei Ascend G510 Maintenance Manual Download Page 73

Page: 73 / 96

G510 Maintenance Manual V1.0

INTERNAL

2013-01-28

Huawei Confidential

Page 73 of 96

The headset's microphone is powered by MIC_BIAS1 (PM8029/HSED_BIAS1) and used to
test the headset's reception function.

The G510's headset is compatible with two headset cable orders, among which the one
compatible with iPhone is used by default. The pull-up voltage is 2.6 V provided by L19.

Troubleshooting

Fault symptom: No voice is heard from the headset.

Handling: Replace the headset or headset jack. Troubleshoot the fault according to the process
shown in Figure 9-36.

Figure 9-36

Troubleshooting process when no voice is heard from the headset

After a call is established, no

voice is heard from the

headset.

Is the headset

volume properly

set?

Adjust the

headset volume to

a proper value.

Is voice heard

from the headset

after headset

replacement?

End

Is the

HS_DETECT

voltage changed

after the headset

is inserted?

Replace the

headset connector.

Return the U8825-1 to

Huawei for repair

Circuit Symbols

Signal Symbol

Description

Reference Measurement or
Waveform

FM_ANT

FM antenna

None

Summary of Contents for Ascend G510

Page 2: ...10 Maintenance Manual V1 0 INTERNAL 2013 01 28 Huawei Confidential Page 2 of 96 Change History Date Version Change Reason Changed Chapter Change Description Author 2012 11 15 V1 0 Released the first issue ...

Page 3: ...ion 13 5 3 Installing the USB Driver 14 5 3 1 Performing a Normal Upgrade 16 5 3 2 Performing a Forcible Upgrade 18 5 4 Upgrading the G510 Using the microSD Card 18 5 4 1 Performing a Normal Upgrade 18 5 4 2 Performing a Forcible Upgrade 20 5 5 Troubleshooting Upgrade Failures 20 6 Repair Tools 22 7 Disassembly Procedure 24 8 Assembly Procedure 30 9 Principles and Failure Analysis 33 9 1 Principle...

Page 4: ...rcuit 63 9 4 3 Receiver and Speaker 65 9 4 4 Microphone 69 9 4 5 Headset Circuit 72 9 4 6 SIM Card Circuit 74 9 4 7 I O Interface Circuit 77 9 4 8 microSD Card Port Circuit 78 9 4 9 FM and Bluetooth Circuit 79 10 Solder Points on the PCB Board and BGA Chip 83 11 Functional Tests 94 11 1 Key Introduction 94 11 2 MMI Tests 95 11 3 Voice Call Test 95 ...

Page 5: ...1 28 Huawei Confidential Page 5 of 96 1 Brief Introduction 1 1 Appearance Figure 1 1 shows the appearance of the G510 Figure 1 1 Appearance of the G510 1 2 Features Item Description Dimensions H x W x D 9 9 mm x 134 mm x 67 mm 0 39 in x 5 28 in x ...

Page 6: ...utput 5 V 1A Flash memory ROM 4 GB RAM 768 MB Camera Rear camera 5 MP Front camera 0 3 MP Bluetooth WCN2243 Bluetooth v2 1 Wi Fi 802 11b g n Battery Li ion battery 1750 mAh Display Resolution 854 x 540 pixels Type TFT Color 16 M Size 4 5 inches Ports Charger port micro USB connector USB port micro USB connector microSD card port microSD card port Headset jack 3 5 mm Temperature Operating temperatu...

Page 7: ...ecautions Only qualified technicians are allowed to perform repair and calibration Perform all operations in electrostatic discharge ESD rooms and wear ESD wrist straps throughout the operations Ensure that all components screws and insulators are installed properly after repair and calibration and that all cables and wires are installed and connected correctly Ensure that the soldering is lead fr...

Page 8: ...2013 01 28 Huawei Confidential Page 8 of 96 3 Exploded View Figure 3 1 shows the exploded view of the G510 Figure 3 1 Exploded view of the G510 Figure 3 2 shows the components in the exploded view Figure 3 2 Components in the exploded view ...

Page 9: ...r camera support 1 7 receiver 1 8 Main board 1 9 Rear camera 1 10 Flash FPC 1 11 Volume power on key FPC 1 12 Speaker 1 13 WIFI antenna 1 14 GPS antenna 1 15 Sim TF FPC 1 16 Back housing assy 1 17 Main antenna 1 18 Battery cover 1 NOTE The components shown in the Figure 3 2 are structural parts of the G510 and cannot be used as reference when spare parts are requested ...

Page 10: ...G510 Maintenance Manual V1 0 INTERNAL 2013 01 28 Huawei Confidential Page 10 of 96 4 Components on the Main PCB ...

Page 11: ...nfidential Page 11 of 96 The following component list is for reference only It is subject to changes without notices The latest component list is available in Huawei s ITEM information system If you have any question contact your local technical support center ...

Page 12: ...iver IC CSP Terminal Dedicated 9 38140064 Semiconductor Sensor Accelerometer LGA 3axis Terminal Dedicated 10 38140024 Semiconductor Sensor E Compass WL CSP Pb free 3axis Terminal Dedicated 11 39110626 Switching Regulators Vin 38V 0 02A QFN 2 2 SMT 2 2 10 LED Driver Terminal Dedicated 12 39110566 Switching Regulators 1 4V 1 5A SMT Terminal Dedicated 13 39210039 Terminal peripheral IC Single Band 2 ...

Page 13: ... Computer Used to copy the upgrade files Upgrade package Main upgrade package Provided for reference only Use the latest released version Customization package Upgrade the software using the customization package provided by the operator Upgrade method Upgrade using the microSD card Normal upgrade or forcible upgrade 5 2 Hardware Connection Figure 5 1 shows the hardware connection Figure 5 1 Hardw...

Page 14: ... 3 Installing the USB Driver To install the USB driver Step 1 Double click DriverSetup exe and click Install in the dialog box shown in Figure 5 2 to start the installation Figure 5 2 Installing the USB driver Figure 5 3 shows the installation progress Figure 5 3 Installation progress ...

Page 15: ...mplete click Close as shown in Figure 5 4 Figure 5 4 Closing the dialog box Step 3 Power on the G510 connect it to the computer using a USB cable and click Device Manager to display the Computer Management window to check that the port information is correct as shown in Figure 5 5 Figure 5 5 Computer Management window ...

Page 16: ... the G510 and use a USB cable to connect the G510 to the computer on which the USB driver and 10KNewMu have been installed Step 2 Double click 10KNewMu Step 3 Click to display the Open dialog box select the upgrade file and click Next as shown in Figure 5 6 Figure 5 6 Select Bin File dialog box Step 4 Click Scan Download to start the upgrade as shown in Figure 5 7 ...

Page 17: ...INTERNAL 2013 01 28 Huawei Confidential Page 17 of 96 Figure 5 7 Starting the upgrade Figure 5 8 shows the upgrade progress Figure 5 8 Upgrade progress If the upgrade is complete Download Success is displayed as shown in Figure 5 9 ...

Page 18: ...steps as you conduct a normal upgrade 5 4 Upgrading the G510 Using the microSD Card 5 4 1 Performing a Normal Upgrade To perform a normal upgrade Step 1 Delete the data on the microSD card or format the microSD card Step 2 Create a folder dload in the root directory of the microSD card and copy UPDATA APP from the main upgrade package to the dload folder Step 3 Insert the microSD card into the G51...

Page 19: ...G510 Maintenance Manual V1 0 INTERNAL 2013 01 28 Huawei Confidential Page 19 of 96 Figure 5 10 Performing a normal upgrade ...

Page 20: ...ain upgrade package to the dload folder Step 3 With the G510 powered off press and hold the power key and the volume up and volume down keys to drive the G510 to enter forcible upgrade mode Figure 5 11 shows how to perform a forcible upgrade Figure 5 11 Performing a forcible upgrade The phone restarts automatically after the forcible upgrade is complete End 5 5 Troubleshooting Upgrade Failures Fai...

Page 21: ... USB cable 1 Check that the USB cable has been properly connected to the computer 2 Perform the upgrade again Failed to upgrade the G510 using the microSD card 1 Check that the upgrade file is correct 2 Check that the upgrade method is correct 3 Check that the microSD card functions properly 4 Perform the upgrade again ...

Page 22: ...wei Confidential Page 22 of 96 6 Repair Tools Name heat gun Usage heats components Name heat gun Usage heats components Name soldering iron Usage solders components Name DC power supply Usage supplies power Name soldering fixture Usage fixes the main PCB ...

Page 23: ...nfidential Page 23 of 96 Name lead free solder wire Usage solders components Name digital multimeter Usage measures parameters during maintenance Name toolkit Usage assembles and disassembles the G510 Name electric screwdriver Usage fastens and removes screws ...

Page 24: ...fidential Page 24 of 96 7 Disassembly Procedure 7 1 Disassembling a Bare Phone 4 Remove the screws on the back cover 3 Remove the battery cover 2 Start to disassemble the U8951 1 Wear the ESD wrist strap and ensure that the ESD wrist strap is properly grounded ...

Page 25: ...front housing cover 9 Unfasten the hook between main board and the Front Housing Assy using forceps 8 disconnect the ZIF connector 7 disconnect the TP and LCD BTB 6 Use a cover opener to loosen the clips between the support and back cover 5 Use a cover opener to loosen the clips between the support and back cover ...

Page 26: ...our left hand to press the knob and right hand to pull the sucker to stick to the touchscreen surface 3 Rotate the knobs to drop the suckers until the touchscreen 2 Push the four blocks to fix the front cover 1 put front housing assy into touchscreen disassembling fixture 12 remove the front camera 11 remove the main camera ...

Page 27: ... connector carefully 9 seprate the touchscreen from front housing rotate the knob slowly 8 Rotate the knob reversely to raise the sucker 7 Heating time should be about 5 min because the clue between touchscreen and front housing is very large 6 heating the touchscreen 5 set the heater temperature to70 ...

Page 28: ...rature of heater about 100 13 rouch sceen and front housing 12 Lift the sucker and detach it from the touchscreen Remove the suckers from the front cover assembly Take out the front cover assembly and remove the long soft object At the same time lift the touchscreen s lower part until it is completely separated from the front cover Ensure that the touchscreen FPC is intact during the process 11 se...

Page 29: ...G510 Maintenance Manual V1 0 INTERNAL 2013 01 28 Huawei Confidential Page 29 of 96 3 deassembly complete ...

Page 30: ... 0 INTERNAL 2013 01 28 Huawei Confidential Page 30 of 96 8 Assembly Procedure 4 Install the TP 3 Install the LCD 2 Install and fix the receiver 1 Wear the ESD wrist strap and ensure that the ESD wrist strap is properly grounded ...

Page 31: ...Huawei Confidential Page 31 of 96 10 Install the speaker onto the backcover 9 Install the main board onto the front housing cover 8 Install the shied front camera 7 Install the shied main camera 6 Install the shied main FPC 5 Install the shied covers ...

Page 32: ...G510 Maintenance Manual V1 0 INTERNAL 2013 01 28 Huawei Confidential Page 32 of 96 13 The assembly is complete 12 Fasten screw drivers 11 Install and fix the backcover ...

Page 33: ...0 is a Qualcomm MSM8225 based UMTS bar type phone developed by Huawei and adopts the MSM8225 PM8029 chip solution provided by Qualcomm The G510 s main PCB consists of the MSM8225 PM8029 and RF components The main PCB connects to components in several ways including Connects to the LCD using the FPC Connects to the receiver and speaker using both springs and the FPC and connects to the RF antenna u...

Page 34: ...The G510 also supports the FM radio and recording The G510 provides the following features TFT LCD with 800 x 480 pixels and a built in RF antenna micro USB port for charging and the SIM card port Polyphonic ringtones and vibration Lithium battery of 1500 mAh providing a standby time of 420 to 440 hours network dependent and talk time of 6 to 8 hours network dependent 9 2 Baseband Unit 9 2 1 Power...

Page 35: ...ependent power management chip PM8029 The PM8029 s power on process is controlled by Qualcomm s codes When the PM8029 detects that the KPD_PWR_ON level is low the PM8029 enables the power on process During the power on process the PM8029 converts the main power supply voltage VHP PWR to voltages shown in Figure 9 3 ...

Page 36: ...ly circuit faults Power on faults are divided into the following types No current The DC current ranges from 0 mA to 5 mA after you connect the G510 to the DC power supply and press the power key Weak current The DC current ranges from 5 mA to 100 mA after you connect the G510 to the DC power supply and press the power key Strong current The DC current exceeds 300 mA after you connect the G510 to ...

Page 37: ...ault identification process upon no current Install a simulated battery on the U8825 1 connect the U8825 1 to the maintenance power press the power key and observe the current Is the copper sheet of the power key oxidized There is no current Clean the power key Is the VPH_PWR voltage normal The maintenance power voltage ranges from 3 4 V to 4 2 V in normal cases Is the clock normal Check U201 N Y ...

Page 38: ...U8825 1 connect the U8825 1 to the maintenance power press the power key and observe the current Is the voltage provided by the PM8029 normal The current is weak Check U201 Is the output frequency of X301 equal to 32 768 kHz or that of U3101 equal to 19 2 MHz Return the U8825 1 to Huawei for repair Re solder or replace X301 and U3101 Y N Y N The U8825 1 fails to be powered on ...

Page 39: ...re 9 7 shows the circuit diagrams for charging management Install a simulated battery on the U8825 1 connect the U8825 1 to the maintenance power press the power key and observe the current Is pin 3 of J1501 grounded The current is strong Check U201 and J1501 Is the voltage of U201 normal Return the U8825 1 to Huawei for repair Re solder or replace U201 N Y Y N The U8825 1 fails to be powered on ...

Page 40: ...G510 Maintenance Manual V1 0 INTERNAL 2013 01 28 Huawei Confidential Page 40 of 96 Figure 9 7 Circuit diagrams for charging management ...

Page 41: ... charging You must select either I IN_LIMIT or IO CHARGE I SHORT Current of trickle charging V RCH Battery voltage when the charging is complete The PM8029 monitors the main voltage of the G510 using the CSOUT pin as follows Trickle charging starts when the battery voltage is smaller than V SHORT Constant current charging starts when the battery voltage is larger than V SHORT and smaller than V OR...

Page 42: ... charging voltage VAUXPWR Vslp the FAN5402UCX enters sleep mode to save electricity The FAN5402UCX can detect the charging voltage VBUS constantly When VBUS is smaller than the threshold VIN minimum the G510 stops charging waits for a certain period and re determines whether the charging conditions are met The FAN5402UCX provides various functions such as charging overvoltage protection battery ov...

Page 43: ...erate properly Replace the charger N Is the USB connector J103 dry jointed Y Y Re weld the J103 Can voltage be detected at the C231 N Y Check the fuse F101 and the bead LB101 N Replace Q201 Is the battery damaged Replace J902 Y End N Does pin 3 of Q201 output voltage Is the battery connector J902 damaged Y Replace the battery Y N Circuit Symbols Signal Symbol Description Reference Measurement or W...

Page 44: ...wer to the power module Powering voltage Voltage range 0 4 2 V BAT_FET_N Control signal output port for the MOS diode Q201 of the battery None VBAT Battery voltage Battery voltage Voltage range 0 4 2 V USB_HS_DP Positive input of USB differential data None USB_HS_DN Negative input of USB differential data None 9 2 3 Clock Circuit Circuit Diagram Figure 9 10 shows the circuit diagrams of the 19 2 M...

Page 45: ...9 12 Block diagram of the 19 2 MHz clock As shown in Figure 9 12 the 19 2 MHz clock outputs clock signals to the PM8029 and RTR6285A The TPK_LO_ADJ controls the clock output precision The TPK_LO_ADJ has two levels of filtering circuits from R204 to C232 and from R3101 to C3101 The TPK_LO_ADJ outputs clock signals to the PM8029 and then to the main chip as the system main clock The 32 768 kHz oscil...

Page 46: ...If the problem persists replace the PM8029 Circuit Symbols Signal Symbol Description Reference Measurement or Waveform XTAL32K _OUT Output end for the 32 768 kHz main clock signals XTAL32K_IN Input end for the 32 768 kHz main clock signals VREG_TCXO 19 2 MHz oscillator power 2 85 V TRK_LO_ADJ Control signal of the 19 2 MHz output frequency None RTR6285_TCXO 19 2 MHz clock output TCXO 19 2 MHz cloc...

Page 47: ...G510 Maintenance Manual V1 0 INTERNAL 2013 01 28 Huawei Confidential Page 47 of 96 Figure 9 13 Circuit diagrams of the flash memory ...

Page 48: ...G510 Maintenance Manual V1 0 INTERNAL 2013 01 28 Huawei Confidential Page 48 of 96 ...

Page 49: ...ow speed bus EBI2 as shown in Figure 9 14 Figure 9 14 Memory interface analysis of the G510 The G510 uses the 4 GB eMMC which uses the eight bit data cable for transmission Troubleshooting Fault symptom The G510 fails to be powered on or the power on current is less than 100 mA Handling Upgrade or upload the system software and verify that the VREG_DCDC_2P85 voltage and peripheral components are n...

Page 50: ...DATA0 Data cable None SDC3_DATA7 Data cable None SDC3_DATA6 Data cable None SDC3_DATA5 Data cable None SDC3_DATA4 Data cable None SDC3_CLK Clock None SDC3_CMD Command None VREG_DCDC_2P85 Flash memory power supply 2 85 V VREG_S3 Power supply 1 8 V MSM_RESOUT_N Reset signal None VPH_PWR 2 85 V system power supply supplying power to the DC DC chip None 9 3 RF Unit RF Unit Principle Block Diagram Figu...

Page 51: ... Frequency Band ANT_SEL0 ANT_SEL1 ANT_SEL2 ANT_SEL3 GSM850 900 TX 1 1 0 0 GSM1800 1900 TX 1 0 0 0 GSM850 RX 0 1 1 0 GSM900 RX 0 1 0 0 GSM1800 RX 0 0 1 0 GSM1900 RX 0 0 0 0 W1900 AWS_TX RX 1 0 1 0 W850 900_TX RX 1 0 1 1 W2100_TX RX 1 1 1 0 NOTE The value 0 indicates the voltage range from 0 V to 0 2 V and the value 1 indicates the voltage range from 1 8 V to 3 0 V The control signals are provided b...

Page 52: ...uawei Confidential Page 52 of 96 Figure 9 16 Circuit diagram of the WCDMA IMT PA Figure 9 17 shows the circuit diagram of the WCDMA 850 MHz PA Figure 9 17 Circuit diagram of the WCDMA 850 MHz PA Figure 9 18 shows the circuit diagram of the WCDMA PCS PA ...

Page 53: ...nfidential Page 53 of 96 Figure 9 18 Circuit diagram of the WCDMA PCS PA Figure 9 19 shows the circuit diagram of the GSM quad band PA Figure 9 19 Circuit diagram of the GSM quad band PA Figure 9 20 shows the circuit diagram of the UMTS IMT RX interstage chain ...

Page 54: ...9 21 shows the circuit diagram of the RTR6285A chip for dual mode RF transceiving Figure 9 21 Circuit diagram of the RTR6285A chip for dual mode RF transceiving Troubleshooting No reception Fault symptom The G510 fails to receive signals Handling The WCDMA 2100 MHz is used as an example Troubleshoot the fault according to the process shown in Figure 9 22 ...

Page 55: ...le of the control signals The WCDMA 2100 MHz receive channel is faulty Are pin 1 and pin 2 of U3301 properly connected Check U3301 before the RF cable is connected Check U3301 Are the control signals of U3302 normal See Table 9 3 for the truth table Are signals output from pin 1 and pin 8 of U3304 normal The insertion loss must not exceed 2 3 dB Check U3302 and U401 Check U3304 Y N Y N N Are I Q s...

Page 56: ...tead of U3304 in the preceding flowchart If the GSM receive channel is abnormal check U3404 instead of U3304 in the preceding flowchart No transmission Fault symptom The G510 fails to transmit signals for the WCDMA 2100 900 MHz and the GSM 900 MHz 1800 MHz transmit channels Handling The WCDMA 2100 MHz frequency band is used as an example Ensure that the SIM card and antenna are properly installed ...

Page 57: ...transmit channel is abnormal check U3501 instead of U3302 in the preceding flowchart The WCDMA 2100 MHz transmit channel is faulty Are pin 1 and pin 2 of U3301 properly connected connected Check U3301 before the RF cable is connected Check U3301 Are the control signals of U3302 normal See Table 9 3 for the truth table Check U401 End Is the WCDMA 2100 MHz PA output of U3302 normal Check U3302 and U...

Page 58: ...al of the transmit baseband None TX_I_P I signal of the transmit baseband None TX_I_M I signal of the transmit baseband None TX_IREF Reference voltage of the RTR transmission None SSBDT_RTR6285A SSBI data cable None PRX_Q_P I Q signal of the primary receive channel None PRX_Q_M I Q signal of the primary receive channel None PRX_I_P I Q signal of the primary receive channel None PRX_I_M I Q signal ...

Page 59: ...PA_ON1 PA for controlling the WCDMA 850 900 MHz frequency band None PA_ON2 PA for controlling the WCDMA 1900 MHz AWS frequency band None PA_RANGE0 Adjusting the PA gain None PA_RANGE1 Adjusting the PA gain None 9 4 Peripheral Circuits 9 4 1 LCD Circuit Circuit Diagram Figure 9 24 shows the LCD circuit diagrams Figure 9 24 LCD circuit diagrams ...

Page 60: ...G510 Maintenance Manual V1 0 INTERNAL 2013 01 28 Huawei Confidential Page 60 of 96 ...

Page 61: ...irs of differential signaling cables and one pair of power cables The LCD interface supports 60 Hz refresh rate provides the frame synchronization function and uses GPIO_097 s MDP_VSYNC as the data transmission synchronization signal to protect the LCD from being cracked Troubleshooting Fault symptom The G510 can be powered on but the LCD displays nothing Handling Check the LCD Troubleshoot the fa...

Page 62: ...dered N Re solder U910 Y Is the connector J1201 properly soldered N Adjust J1201 Y Return the U8825 1 to Huawei for repair Circuit Symbols Signal Symbol Description Reference Measurement or Waveform VREG_L12_2P85 LCD analog voltage 2 85 V VREG_S3 I O digital voltage 1 8 V MIPI_DSI_LANE2_P Differential signal 1 8 V MIPI_DSI_LANE2_N Differential signal 1 8 V MIPI_DSI_LANE1_P Differential signal 1 8 ...

Page 63: ...al signal 1 8 V MIPI_DSI_CLK_N Clock differential signal 1 8 V 9 4 2 Vibrator Circuit Circuit Diagram Figure 9 26 shows the vibrator circuit diagram Figure 9 26 Vibrator circuit diagram Analysis The PM8029 s VIB_DRV_N pin serves as the drive pin of the vibrator and is located on the main PCB When the vibrator is not vibrating the level VPH_PWR and VIB_DRV_N is high Troubleshooting Fault symptom Th...

Page 64: ...rly soldered The maintenance process then ends Is power properly supplied to the vibrator Is the voltage at the cathode lower than that of the anode N N Check the power Does the vibrator operate properly after replacement Y Y End N Return the U8825 1 to Huawei for repair Circuit Symbols Signal Symbol Description Reference Measurement or Waveform VPH_PWR Main power supply signal supplying power to ...

Page 65: ...ntenance Manual V1 0 INTERNAL 2013 01 28 Huawei Confidential Page 65 of 96 9 4 3 Receiver and Speaker Speaker Circuit Diagram Figure 9 28 shows the speaker circuit diagrams Figure 9 28 Speaker circuit diagrams ...

Page 66: ...G510 Maintenance Manual V1 0 INTERNAL 2013 01 28 Huawei Confidential Page 66 of 96 Receiver Circuit Diagram Figure 9 29 shows the receiver circuit diagrams Figure 9 29 Receiver circuit diagrams ...

Page 67: ...it inside the MSM8225 The G510 provides three kinds of audio output Receiver output Signals are output by the CPU Speaker output Signals are output by the PM8029 to the PA and to the speaker Microphone output The G510 provides the two channel headset Signal Symbol Description Reference Measurement or Waveform EAR1_AMP_1_OP Output to the receiver None EAR1_AMP_1_ON Output to the receiver None ...

Page 68: ..._OUT_L_P Output by the PM8029 to the PA and to the speaker None SPK_OUT_L_M Output by the PM8029 to the PA and to the speaker None Troubleshooting Fault symptom After a call is established no voice is received Handling Troubleshoot the fault according to the process shown in Figure 9 31 ...

Page 69: ...et N Adjust the headset volume to a proper value Y Is the receiver properly connected N Re solder the receiver wire Does the U8825 1 detect the headset when the headset is not inserted Y Check the headset connector Y Is voice received after receiver replacement N End Y Are peripheral circuits of U2002 dry jointed and deflected N End Return the U8825 1 to Huawei for repair Y N 9 4 4 Microphone Circ...

Page 70: ... INTERNAL 2013 01 28 Huawei Confidential Page 70 of 96 Figure 9 32 Circuit diagram of the primary microphone Figure 9 33 shows the circuit diagram of the secondary microphone Figure 9 33 Circuit diagram of the secondary microphone ...

Page 71: ...2 MSM_MICBIAS primary microphone 7227A MIC_BIAS Troubleshooting Fault symptom The G510 fails to transmit voices Handling Troubleshoot the fault according to the process shown in Figure 9 34 Figure 9 34 Troubleshooting process when the G510 fails to transmit voices After a call is established no voice is transmitted Is the software properly reloaded End Y Is voice properly the microphtransmitt ed a...

Page 72: ...phone input None MSM_MICBIAS Bias voltage of the primary microphone None SND_MICBIAS Bias voltage of the secondary microphone None 9 4 5 Headset Circuit Circuit Diagram Figure 9 35 shows the headset circuit diagram Figure 9 35 Headset circuit diagram Analysis The headset is tested using the GPIO_026 s HS_DETECT_N after being inserted to the G510 Before the headset is inserted HS_DETECT_N is conver...

Page 73: ...Handling Replace the headset or headset jack Troubleshoot the fault according to the process shown in Figure 9 36 Figure 9 36 Troubleshooting process when no voice is heard from the headset After a call is established no voice is heard from the headset Is the headset volume properly set Adjust the headset volume to a proper value N Y Is voice heard from the headset after headset replacement End Y ...

Page 74: ...icrophone Voltage Signal MIC2_P Headset microphone input None MIC2_N Headset microphone input None HSED_ADC_DET Headset microphone detection Voltage change HS_DETECT Headset insertion detection Voltage change GND_MIC3 Grounding signal of the headset microphone None 9 4 6 SIM Card Circuit Circuit Diagram Figure 9 37 shows circuit diagrams of the SIM card Figure 9 37 Circuit diagrams of the SIM card...

Page 75: ...96 Analysis The PM8029 provides input and output signals to control the SIM card port of the G510 Troubleshooting Fault symptom The G510 fails to detect the UIM card Handling Check that the UIM card slot is normal Troubleshoot the fault according to the process shown in Figure 9 38 ...

Page 76: ...U8825 1 to Huawei for repair Circuit Symbols The PM8029 s MPP pin converts the level for the PM8029 to connect to the SIM card The level VREG_L16_UIM1 ranges from 1 5 V to 3 05 V The operating level of the USIM card port is 1 8 V or 3 0 V Table 9 4 lists PM8029 provided interface signals for converting the USIM card level Table 9 4 Interface signals for converting the USIM card level Interface Sig...

Page 77: ... I O interface the charger provides the VCHG charging voltage to charge the battery When a data cable is connected to the I O interface USB_HS_DN and USB_HS_DP are used for communication between the G510 and computer to upgrade the software and read the G510 s information Troubleshooting Fault symptom The I O interface is faulty and the battery fails to be charged Handling Clean re solder or repla...

Page 78: ...re 9 40 shows the circuit diagram of the microSD card port Figure 9 40 Circuit diagram of the microSD card port Analysis The U1402 is used to provide the ESD protection and EMI filtering Troubleshooting Fault symptom The G510 fails to detect the microSD card Handling Troubleshoot the fault according to the process shown in Figure 9 41 ...

Page 79: ...d the microSDcard after microSDcard replacement Do not read the micro SD card Y The U8825 1 fails to detect the microSD card Can signals pass U1402 properly N Re solder the 1402 Y Does the U8825 1 operate properly after software upgrade End Y N Return the U8825 1 to Huawei for repair N N 9 4 9 FM and Bluetooth Circuit Circuit Diagram Figure 9 42 shows the circuit diagram of the FM and Bluetooth ...

Page 80: ...d UART interfaces for directly connecting to the PCM and UART interfaces of the Bluetooth module Table 9 5 lists the signals provided by the MSM8825 on the PCM and UART interfaces Table 9 5 Signals on the PCM and UART interfaces Signal Provided by the MSM8225 Signal Line Definition GPIO_44 UART1_CTS_N Ready to receive signal sent from the MSM8225 GPIO_43 UART1_RFR_N Clear to send signal received b...

Page 81: ...dule Table 9 6 lists the signals on the audio input interface Table 9 6 Signals on the audio input interface Signal Provided by the WCN2243 Signal Line Signal Provided by the MSM8225 Description FM_RXP FM_ANT FM antenna headset FM_RXN N A N A N A FM_VDD2P5 SR_AVDD2P5 N A N A FM_AOUT1 FM_OUT_L PM8029 LINE_IN_LP FM OUTPUT FM_AOUT2 FM_OUT_R PM8029 LINE_IN_RM FM OUTPUT Troubleshooting Fault symptom Th...

Page 82: ...when the FM radio fails The FM radio does not meet expectation Can the FM radio operate properly after headset replacement End Y N Can the FM radio operate properly after the headset connector is re soldered Y End N Does the FM radio operate properly after software upgrade Y End N Return the U8825 1 to Huawei for repair ...

Page 83: ... Confidential Page 83 of 96 10 Solder Points on the PCB Board and BGA Chip This chapter describes views of the PCB board BAG chip and related components NOTE Red R 255 G 0 B 0 vacant point Green R 0 G 255 B 0 grounding point Blue R 0 G 0 B 255 solder point ...

Page 84: ...G510 Maintenance Manual V1 0 INTERNAL 2013 01 28 Huawei Confidential Page 84 of 96 Top View of the Main PCB ...

Page 85: ...G510 Maintenance Manual V1 0 INTERNAL 2013 01 28 Huawei Confidential Page 85 of 96 Bottom View of the Main PCB ...

Page 86: ...G510 Maintenance Manual V1 0 INTERNAL 2013 01 28 Huawei Confidential Page 86 of 96 U201 ...

Page 87: ...G510 Maintenance Manual V1 0 INTERNAL 2013 01 28 Huawei Confidential Page 87 of 96 U401 ...

Page 88: ...G510 Maintenance Manual V1 0 INTERNAL 2013 01 28 Huawei Confidential Page 88 of 96 U1800 ...

Page 89: ...G510 Maintenance Manual V1 0 INTERNAL 2013 01 28 Huawei Confidential Page 89 of 96 U901 U1002 ...

Page 90: ...G510 Maintenance Manual V1 0 INTERNAL 2013 01 28 Huawei Confidential Page 90 of 96 U1205 ...

Page 91: ...G510 Maintenance Manual V1 0 INTERNAL 2013 01 28 Huawei Confidential Page 91 of 96 U3801 ...

Page 92: ...G510 Maintenance Manual V1 0 INTERNAL 2013 01 28 Huawei Confidential Page 92 of 96 U6000 ...

Page 93: ...G510 Maintenance Manual V1 0 INTERNAL 2013 01 28 Huawei Confidential Page 93 of 96 U1402 ...

Page 94: ...01 28 Huawei Confidential Page 94 of 96 11 Functional Tests 11 1 Key Introduction Figure 11 1 shows the keys of the G510 Figure 11 1 Keys of the G510 Volume down key Menu key Home key Headset connector Volume up key Power key unlock key Back key ...

Page 95: ...w function is normal and press the volume up key to verify that the camera flash operates properly Touchscreen test Touch the black spot area according to instructions displayed on the screen Approaching light test Shield the approaching light hole to check for changes on the LCD Vibrator test Check that the vibrator vibrates properly and whether noises occur Speaker test Play an audio clip to che...

Page 96: ...e G510 Step 3 Check that the signal strength changes properly on a normal network Step 4 Place a call to a fixed line phone and check the voice quality during the call Step 5 If no problems are found exit the voice call test If any problem is found troubleshoot the problem or send the G510 to an advanced service center for repair End ...

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