FLY IQ458 User manual

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SERVICE MANUAL
Date Version Maintenance Level Author
2014-02-26 V1.0 L1~L4

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CAUTIONS
Please refer to the phone’s user’s guide for instructions relating to
operation, care, and maintenance, which include important safety
information.
1. Servicing and alignment must be undertaken by qualified personnel
only.
2. Ensure all work is carried out at an 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 service supplier must observe the
precautions which mentioned above.

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GENERAL REPAIR INFORMATION
1. Make sure your testing equipment is functioning properly before
beginning repair work.
2. Before starting repairs you must observe ESD precautions such as
being in your ESD protected area and connecting your wristband.
3. Use gloves to avoid corrosion and fingerprints.
4. Cover windows and displays with a protective film to avoid dust and
scratches.
5. Use a lint-free cloth to clean the LCD.
6. When cleaning the pads use a soft cloth\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 with regard to the
fault symptom. And re-solder them if necessary.
11. Remove excess soldering flux after repair.
12. Observe the torque requirements when assembling the unit.
13. please aware that some malfunctions may be software related and
solved by an update

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850 Rework station & Solder Iron
Multimeter
Chapter 1
Service tools
DC power supply

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Digital Oscillograph
Screw driver and tweezers
Solder wire

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Wrist grounding strap, Antistatic gloves
Chapter 2
Baseband Circuit Analysis
Flux paste

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2.1 Mobile solution
MT6582 is a highly integrated baseband platform incorporating both
modem and application processing and connectivity subsystems to enable 3G
smart phone applications. The chip integrates a Quad-core ARM Cortex-A7
MPCore operating up to 1.3GHz, an ARM Cortex-R4 MCU and a powerful
multistandard viedo accelerator . The MT6582 interfaces to NAND flash
memory, LPDDR2 and LPDDR3 for optimal performance and also supports
booting from SLC NAND OR EMMC to minimize the overall BOM cost. In
addition, an extensive set of interfaces are included to interface to cameras,
touch-screen displays, MMC/SD cards .
The Application processor, Quad-core ARM Cortex-A7 MPCore which
includes a NEON multimedia processing engine , offers processing power
necessary to support the latest OpenOS along 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 decoders and
encoders such as H.264 and MPEG-4. Audio supports include FR, EFR,
HR ,AMR RF,AMR HRand Wide-Band AMR vocoders, polyphonic ringtones
and advanced audio functions such as echo cancellation, hands-free
speakerphone operation and noise cancellation.
An ARM Cortex-R4, DSP, and 2G and 3G coprocessors provide a
powerful modem subsystem capable of supporting Category 14(21Mbps)
HSDPA downlink and Category 6 (5.76 Mbps) HSUPA uplink data rates, as well
as Class 12 GPRS , EDGE as well as Category 14(2.8Mbps) TD-HSDPA
downling and Category (2.2Mbps)TD-HSUPA uplink data rates.
2.2 Baseband Block Diagram

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Figure 2-1: Block diagram
MT6572 is a highly integrated 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

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manufacturers build high-performance 3G smart phones with PC-like browser,
3D gaming and cinema class home entertainment experiences.
2.3 Baseband Chip Pin Description (U100 MT6582)
2.3.1 MCU Subsystem
General
Smartphone two MCU subsystems architecture
SLC NAND flash OR EMMC flash bootloader
AP MCU subsystem
Quad-core ARM Cortex-A7 MPCore oprearing at 1.3GHz
NEON multimedia processing 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-performance AXI and AHB bus
General DMA engine and dedicated DMA channels for peripheral data tranfser
Watchdog timer for systen error recovery
Power management for clock gating control

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Figure2-2: CPUU100CMCUpart
2.3.2 External Memory Interface
Figure 2-3: CPU U100F External Memory part
EM
data
bus
EM
control
channel
EM
addres
b

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External memory interface
SupportsLPDDR2/3up to 2GB
32-bit data 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)

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Figure 2-4: Flash memory

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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)

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Battery charging
The charger controller senses the charger input voltage (CHRIN) from either a
standard AC-DC adaptor or an USB charger. When the charger input voltage is within
a pre-determined range, the charging process is activated. This detector can resist
higher input voltages than other parts of the PMIC. Therefore, if an invalid charging
source is detected (> 7.0 V), the charger detector stops the charging process
immediately to avoid burning out the chip or even the phone.
After a valid charging source is applied, the detection circuits further check the
CHRIN voltage to 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 can be observed by the read-only register named
CHRDET.
Charging circuit description (U250)
1. Charge Detection
Figure 2-6: charging circuit part
When the charger is active, the charger controller manages the charging
phase according to the battery status. During the charging period, the battery voltage
is constantly monitored. The battery charger in MT6572 supports pre-charge mode

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(VBAT<3.2V, switched-off state), CC mode (constant current mode or fast charging
mode at the range of 3.2V<VBAT<4.2V) and CV mode (constant voltage mode) to
optimize the charging procedure for Li-ion battery.
2. Pre-Charging mode
When the battery voltage is in the UV state, the charger operates in the
pre-charge mode. There are two steps in this mode. While the battery voltage is
deeply discharged below 2.2V, a IPRECC0 trickle charging current applies to the
battery.
When the battery voltage exceeds 2.2V, the closed-loop pre-charge is enabled.
The voltage drop across the external Rsense resistor is kept around 25mV (Typ.).
3. Constant Current Charging Mode
As the battery is charged up and over 3.2V, it can switch to the CC mode.
(CHREN should be high) In CC mode, several charging currents can be set by
programming registers or the external Rsense resistor. The charging current can be
determined by Vch,ref/Rsense, where Vch,ref is programmed by registers. For
example, if Rsense is selected as 0.2Ohm, the CC mode charging current can be set
from 50mA to 800mA. It can accommodate the battery charger to the various charger
inputs with different current capability.
Due to process variation, the charging current 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. Constant Voltage Charging Mode
If the battery voltage has reached the final value, said 4.2V, a constant voltage
is applied to the battery and keeps it at 4.2V. After that, the charging current becomes
smaller and smaller. When the charging current is less than a pre-determined
threshold for a while, it enters the charge complete state. The charging process will be
terminated by setting CHREN=0. The charge complete detection and CHREN control
are managed by BB/SW.
Once the battery voltage exceeds 4.3V for any reason, the hardware over
voltage protection (OV) will take action and turn off the charger immediately to
prevent permanent damage to the battery.
When charging, the PMIC uses GATEDRV pin to control the current flow
through the base of the external BJT. The charging current from the collect BJT of is
sensed by the voltage drop across the external Rsense resistor (Typ. 0.2 Ω). Then the
charging controller and the external components (NMOS,BJT, Rsense and battery)
form a regulated charging loop.

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Charger detector
(
4~7V
)
N
PRE-CHARGE
YN
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

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Dual SIM Interface
There are two SIM card interface modules to support two SIM cards
simultaneously. The SIM card interface circuitry of PMU meets all ETSI and
IMT-2000 SIM interface requirements. It provides level shifting needs for low voltage
GSM controller to communicate with either 1.8V or 3V SIM cards. All SIM cards
contain a clock input, a reset input, and a bi-directional data input/output. The clock
and reset inputs to SIM cards are level shifted from the supply of digital IO (Vio) of
baseband to the SIM supply (Vsim). The bi-directional data bus is internal pull high to
Vsim via 5KΩresistor.
All pins that connect to the SIM card (Vsim, SRST, SCLK, SIO) withstand
over 5kV HBM (human body mode) ESD. In order to ensure proper ESD protection,
careful board layout is 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
regulator as long as the PWRKEY is kept low . MT6323 outputs reset signal RESET
toMT 6582 SYSRTB input.After SYSRSTB is de-asserted,the microprocessor starts
and pulls BBWAKEUP high.After that PWRKEY can be released, pulling
BBWAKEUP high will also turn on the handset. This is the case when the alarm in
the RTC expires.
Besides, applying a valid external supply on CHRIN will also turn on the handset.
However, If the battery is in UV state (VBAT<3.2V), the handset can’t be turned-on
in any way.
The UVLO function in the MT6323 prevents system startup when initial voltage of

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the main battery is below the 3.2V threshold. When the battery voltage is greater than
3.2V, the UVLO comparator 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

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Figure 2-10: PMU LDO output voltage list

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2.3.4 Camera Management
Camera ISP: 8MP
 MIPI/Parallel I/F, EIS, face detection
Image Signal Processor
− Integrated image signal processor supporting 13MP
Supports electronic image stabilization
Supports video stabilization
Supports noise reduction
Supports preference color adjustment
Supports 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 :Baseline encoding with 120M pixeil/sec
Supports YUV422/YUV420 color format and EXIF/JFIF format