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Repair flow for phone dead

Phone dead

Upgrade the software can

settle the defect issue?

Check and reinstall the keypad

or replace the touch panel.

Check battery connector

and battery touch point if

is dropped or dirty?

Check the keypad if stuck or
touch panel do not work to
make the phone “dead”?

Check the CPU if is rosin

joint or damage?

Check the flash if is

rosin joint or damage?

END

Clean or replace the battery

or battery connector.

Reweld or replace U500.

U100 Reweld or replace U100.

Upgrade the

Software.

YES

NO

YES

NO

YES

NO

NO

YES

YES

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Summary of Contents for IQ458

Page 1: ... SERVICE MANUAL Date Version Maintenance Level Author 2014 02 26 V1 0 L1 L4 ...

Page 2: ...anti static workstation and that an anti static wrist strap is worn 3 Use only approved components as specified in the parts list 4 Ensure all components modules screws and insulators are correctly re fitted after servicing and alignment 5 Ensure all cables and wires are repositioned correctly Electrostatic discharge can easily damage the sensitive components of electronic products Therefore every...

Page 3: ...th ESD brush and isopropanol 7 Non faulty mechanical parts except shielding lids and bent parts or soldered components May be reused if they are not soldered 8 When removing the shielding lids make sure to cover it back or replace them with new ones otherwise the high frequency leakage can affect the device 9 Always use the original spare parts 10 Check the soldering joints of the parts concerned ...

Page 4: ... 850 Rework station Solder Iron Multimeter Chapter 1 Service tools DC power supply ...

Page 5: ... Digital Oscillograph Screw driver and tweezers Solder wire ...

Page 6: ... Wrist grounding strap Antistatic gloves Chapter 2 Baseband Circuit Analysis Flux paste ...

Page 7: ...ong with its demanding applications such as web browsing email GPS navigation and games All are viewed on a high resolution touch screen display with graphics enhanced by the 3D graphics acceleration The multi standard video accelerator and an advanced audio subsystem are also included to provide advanced multimedia applications and services such as streaming audio and video a multitude of decoder...

Page 8: ...egrated 3G system on chip SOC which incorporates advanced features e g HSPA R8 modem Quad Core ARM Cortex A7MPCore operating at 1 3GHz 3D graphics OpenGL ES 2 0 8M camera ISP LPDDR2 3 533 MHz and High Definition 1080p video decoder MT6582 helps phone ...

Page 9: ...cessing engine with SIMv2 VFPv4 ISA support 32KB L1 I Cache and 32KB L1 D Cache 512KB unified L2 cache DVFS technology with adaptive oprating voltage from1 05V to 1 26V MD MCU subsystem ARM Cortex R4 processor with maximum 491 5MHz operation frequency 32KB I Cache and 16KB D Cache 256KB TCM tightly coupled memory DSP for running modem voice tasks with maximum 240MHz operation frequency High perfor...

Page 10: ... Figure 2 2 CPU U100C MCU part 2 3 2 External Memory Interface Figure 2 3 CPU U100F External Memory part EM data bus EM control channel EM addres b ...

Page 11: ... bus width Memory clock up to 533MHz Supports self refresh partial self refresh mode Low power operation Programmable slew rate for memory controller s IO pads Supports dual rank memory devices Advanced bandwidth arbitration control Flash memory IC description U500 ...

Page 12: ... Figure 2 4 Flash memory ...

Page 13: ... 2 3 3 Power Manage Unit Interface Power on key press input Low active Figure 2 5 CPU U100D Power and Supply part A Charger PWR ON SIM ...

Page 14: ...o see if the charger input is high enough The charging process will be enabled when CHRIN 4V in pre charge mode VBAT 3 2V If VBAT 3 2V it requires CHRIN voltage higher than VBAT by 4 to ensure that the battery can be charged up If the CHRIN voltage becomes lower for some reasons the charging process will be disabled when CHRIN voltage is no longer higher than VBAT by 2 The charging ON OFF status c...

Page 15: ...urrent may vary form chip to chip To compensate for this variation the offset registers can be set in MT6582 The PMIC reads this compensation value and applied the charging current offset when the phone is in the charging state This compensation value could be obtained during the calibration process in phone production or it could be constantly observed by the BB while the phone is charging 4 Cons...

Page 16: ... Charger detector 4 7V N PRE CHARGE Y N No charging N Y CONSTANT CURRENT MODE Vbat 3 2V Vbat 4 2V CONSTANT VOLTAGE MODE Vbat 4 3V CHARGE OFF Vbat 4 3V CH_EN 1 Vbat 3 2V CH_EN 1 NO CHARGE N Y ...

Page 17: ... required Figure 2 7 Dual SIM circuit part Power on Sequence The external PMIC MT6323 for application processor MT6582 handles the power ON and OFF of the handset There are three ways to power on the handset system When VBAT 3 2V Pulling PWRKEY low User push PWRKEY Pulling PWRBB high Baseband BB_WakeUp Valid charger plug in Pulling PWRKEY low is a normal way to turn on the handset which turns on r...

Page 18: ...switches and the threshold is reduced to 2 75V which allows the handset to start smoothly unless the battery decays to 2 75v and below Once the MT6582 enters UVLO state it draws very low quiescent current The VRTC LDO is still active until the DDLO disables it PMU LDO Figure 2 9 CPU U100B Power and Supply part B ...

Page 19: ... Figure 2 10 PMU LDO output voltage list ...

Page 20: ... lens shading correction Supports auto sensor defect pixel Supports AE AWB AF Supports edge enhancement sharpness Supports face detection and visual tracking Supports zero shutter delay image capture Supports capturing full size image when recording viedo up to 13M sensor Supports MIPI CSI 2 high speed camera serial interface with 4data lane for main 2 data lane for sub Hardware JPEG encoder Basel...

Page 21: ... ...

Page 22: ...rts portrait panel resolution up to qHD 960x540 MIPI DSI interface 4data lanes Embedded LCD gamma correction Supports true colors Supports color enhancement Supports adaptive contrast enhancement Support image video graphic sharpness enhancement ...

Page 23: ...ble Supports spatial and temporal dithering Supports side by side format output to stereo 3D panel in both portrait and landscape modes Supports dynamic backlight scaling Figure 2 13 LCM connector Figure 2 14 LCM Backlight Driver circuit 2 3 6 Audio Management ...

Page 24: ... Figure 2 15 CPU U200 Audio processor part Audio circuit description Figure 2 16 Audio output to Receiver ...

Page 25: ... Figure 2 17 MIC circuit of Headset Figure 2 18 Audio circuit of Handset MIC ...

Page 26: ... Figure 2 19 Ring tong circuit Download data USB communicate channel 2 3 7 I O interface circuit description IO2090 Figure 2 21 I O interface circuit Debug Channel ...

Page 27: ... Bootrom USBDL Flow How to enter bootrom USB download mode Auto Detect Mode default setting GPIO Only Mode key matrix KCOL0 tie to GND ...

Page 28: ...ed Supported WiFi 11b g n features Supported WiFi SDIO 2 0 4 bits and 1 bit up to 50MHz Bluetooth specification 3 0 HS 802 11 AMP compliance Supported Bluetooth 4 0 BT Low Energy LE GPS GALILEO QZSS SBAS WAAS MSAS EGNOS GAGAN support Best GPS sensitivity 165 dBm tracking sensitivity 160 hot start sensitivity Supported FM 76 108MHz band with 50KHz step Supported FM RDS RBDS ...

Page 29: ... ...

Page 30: ...m PCM I2S BT I2C FM FM analog audio input output Ref Clock Source Supported Xtal TCXO PCTCXO Chapter 3 RF Circuit Analysis The MT6166 is a RF transceiver targeted at high speed 2G 3G FDD TDD muli mode smart phone and tablet computers implanted in 40nm COM The RF transceiver function is fully integrated Key faeatures ...

Page 31: ... Transceiver Description Figure 3 5 Receive Transceiver circuit ...

Page 32: ... Mobile solution diagram GGE GSM GPRS EDGE Figure 3 1 RF Interface Block Diagram Figure 3 2 IQ Signal Process Block Diagram MT6582 I Q SDATA MT6166 APC RF77593 LE AFC SCL ...

Page 33: ... RF receiver circuit description Figure 3 3 PA switcher circuit Figure 3 4 Receive saw filter circuit CPU MT6582 GSM850 900 SF PA SKY77593 DCS1800 1900 SF Transceiver MT6166 ...

Page 34: ... RF transit circuit description CPU MT6582 Transceiver MT6166 PA SKY77593 PA ENABLE Auto POWER CONTROL L10 ANTENNA POWER E GSM IN ...

Page 35: ... Mobile solution diagram WCDMA Figure 3 1 RF Interface Block Diagram I Q BSI MT6166 SAYFP1G95CA0B00 RF3232 MT6582 RX TX RF3232 SKY77593 ...

Page 36: ... Figure 3 2 IQ Signal Process Block Diagram RF receiver circuit description Figure 3 3 PA switcher circuit Figure 3 4 Receive saw filter circuit CPU MT6582 PA RF3232 SAYFP1G95 Transceiver MT6166 ...

Page 37: ... RF transit circuit description CPU MT6582 Transceiver MT6166 PA Sky775 SAYFP 1G95 PA SKY77593 ...

Page 38: ... Figure 3 4 RF transit circuit pin outs ...

Page 39: ... ...

Page 40: ...z Make the phone connect the power supply and find the current swing at 50 100mA END Check the power manage supply output VCCRE 1 8V VDD 2 8V AVDD 2 8V VTCXO 2 8V VMEM 2 8V VRTC 1 2V Replace U100 MT6582 Upgrade the software Check and replace the I O connector Replace or reweld flash Replace or reweld power manage IC ...

Page 41: ...ctor Replace or reweld flash 26MHZ 32 768KHZ Check and replace system clock 26MHz 32 768KHz Check the power manage supply output VCCRE 1 8V VDD 2 8V AVDD 2 8V VTCXO 2 8V VMEM 2 8V VRTC 1 2V Replace or reweld power manage IC Replace U100 MT6582 Make the phone connect the power supply and find low or no current Check the battery connector and power key NO NO YES YES NO NO NO YES NO ...

Page 42: ...C WiFi IC FM IC CPU END Check and replace RF PA Audio PA PM IC Check if the capacitance varistor LDO tube leakage Use the touch method to check and replace the heat spare parts Make the phone connect the power supply and then press power key find large current make the phone heat YES YES NO YESS YES NO NO YES ...

Page 43: ...or and battery touch point if is dropped or dirty Check the keypad if stuck or touch panel do not work to make the phone dead Check the CPU if is rosin joint or damage Check the flash if is rosin joint or damage END Clean or replace the battery or battery connector Reweld or replace U500 U100 Reweld or replace U100 Upgrade the Software YES NO YES NO YES NO NO YES YES ...

Page 44: ...0 th PIN of LCM400 have signal or not check 7 rd digit cable status No display or display abnormality after power on Check LCD connector is OK or not Change LCD FPC Change or re solder U100 MT6582 Check LCD if damage or liquid flow out Change LCD Clean re solder connector Upgrade software ...

Page 45: ...oblem solve Check the connect status between TP and PCB Re solder or reassemble Change TP Problem solve Check the working status of B420 is Ok or not Re solder or change CPU MT6582 END Do calibration first Problem solve Check voltage of PCBA FPC connector is OK or not Change chip bead ...

Page 46: ... Insert SIM Repair Process ...

Page 47: ... N0 weak signal trouble shooting ...

Page 48: ... ...

Page 49: ... Receiver low voice or no voice ...

Page 50: ... No Low sound from MIC ...

Page 51: ... Does not charge remind error charge ...

Page 52: ... Does not charge no charge ...

Page 53: ... Stand by short time ...

Page 54: ... Can t read T Flash card ...

Page 55: ... WIFI BT FM GPS defect repair flow chart ...

Page 56: ... factory TEST ...

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