FLY IQ4501 Service Manual
Service Manual
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CONTENT
1 OUTLINE ................................................................................................................................................. 3
1.1 MOBILE PHONE INTRODUCTION..................................................................................................... 3
1.2 MOTHERBOARD COMPONENTS DISTRIBUTION ........................................................................................... 6
2 SIGNAL FLOW AND FAULT ANALYSIS ...................................................................................................... 7
2.1 RF PART ............................................................................................................................................ 7
2.1.1 Block Diagram of the RF Section ............................................................................................. 7
2.1.2 Signal Flow OF the RF Transmitting Part.................................................................................. 7
2.1.2.1 Receiving and Transmit Path ............................................................................................ 7
2.1.2.2 Maintenance Procedures of the Transmitting Part .......................................................... 9
2.1.3 Signal Flow of the Receiving Part .......................................................................................... 10
2.1.3.1 Receiving Part Components ........................................................................................... 10
2.1.3.2 Maintenance Procedures of the Receiving Part ........................................................ 10
2.2 BASEBAND PART ................................................................................................................................ 12
2.2.1 Block Diagram of the Baseband Part ..................................................................................... 12
2.2.2 Power Management Part ...................................................................................................... 13
2.2.2.1 The Whole Power Supply System ................................................................................... 14
2.2.3 Audio Part .............................................................................................................................. 15
2.2.3.1 Audio CODEC Circuit ...................................................................................................... 15
2.2.3.2 MIC, RECEIVER LOOP ...................................................................................................... 16
2.2.3.3 HEADSET LOOP ............................................................................................................... 17
2.2.4 BASEBAND FAUIT ISSUES ....................................................................................................... 18
2.2.4.1 Analysis of the Keyboard Fault ....................................................................................... 18
2.2.4.2 Analysis of the Display Module Circle ............................................................................ 19
2.2.4.3 FM Module ..................................................................................................................... 20
2.2.4.4 Camera Module.............................................................................................................. 21
2.2.4.5 IO Interface .................................................................................................................... 22
2.2.4.6 SIM Card Circuit ............................................................................................................. 22
2.2.4.7 T-FLASH Card Circuit ..................................................................................................... 23
2.2.4.8 BT Circuit ....................................................................................................................... 23
2.2.4.9 WIFI Circuit .................................................................................................................... 24
2.2.4.10 GPS Circuit ................................................................................................................... 25
2.2.4.11 M-sensor Circuit .......................................................................................................... 26
2.2.4.12 G-sensor Circuit ........................................................................................................... 26
2.2.4.13 IR-sensor Circuit .......................................................................................................... 27
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1 Outline
Product Hardware Introduction
Base Chip Set
BB
MT6582V/X
PMIC
MT6323GA
Transceiver
MT6166
Camera DSP/MMP
NA
RFPA
SKY77590-11
FM
MT6627
BT
MT6627
Audio CODEC&PA
-
Memory
Samsung
TP IC
GT915
Peripheral
Configuration
LCD
-
Backlight Driver
RT8514
CAMERA
OV8830
Memory Card
TF Card
Antenna
monopole
Basic
Performance
Indicators
Leakage current
≤ 150uA
Standby current
≤ 7mA
Call current as
maximum power
TBD
Board-level power
EGSM
32.5dBm
GSM850
32.5 dBm
DCS
29.5dbm
PCS
29.5dbm
Band1
23dbm
Band8
23dbm
Board-level
receiver sensitivity
EGSM
-108dbm
GSM850
-108 dbm
DCS
-108 dbm
PCS
-108 dbm
1.1 MOBILE PHONE INTRODUCTION
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Band 1
-109.5 dbm
Band 8
-109.5 dbm
TRP
EGSM
28.8dbm
GSM850
27.0 dbm
DCS
28.0dbm
PCS
28.0dbm
Band 1
20.0dbm
Band 8
20.0dbm
TIS
EGSM
-105dbm
GSM850
-105dbm
DCS
-106dbm
PCS
-106dbm
Band 1
-107dbm
Band 8
-107dbm
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CPU
MT6582V/X
PMIC
MT6323GA
BATTRY
CAMERA
FM、BT、
WiFi、GPS
LCD：854*480
KEYPAD
T-FLASH
MEMORY
MT6166
SKY77590
-11
SPK
HP
REC
DUAL SIM
CARD
MIC
CTP
System Block Diagram
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1.2 Motherboard Components Distribution
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2 Signal Flow And Fault Analysis
A
N
T
PA &
Ant Switch
SKY77590
-11
Transceiver
MT6166
CPU
MT6582V/
X
MT6582V/X
MT6166
2.1 RF Part
2.1.1 Block Diagram of the RF Section
RF Diagram
GSM RF and BB interface diagram
2.1.2 Signal Flow OF the RF Transmitting Part
2.1.2.1 Receiving and Transmit Path
Receiving
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2.1.2.2 Maintenance Procedures of the Transmitting Part
（NO launch） Connect the PC and the phone with maintenance line,
then making the phone into the RF state with META software
Check Transceiver to see
if IO signals exist.
Check the PA output to
see if there is RF signal in
Y
Check CPU
N
Check RF coaxial
switch or matching
network.
Y
Check the Transceiver
to see if there is RF
signal output.
N
CheckVBAT,PA_EN,B
ANDSW_DCS,VAPC
Replace PA
Y
Check CPU
Y
Check Transceiver if LE、
SCLK/SDAT、RFVCOEN、
VCXOEN have the
correct signal.
N N
N
Y
Replace Transceiver
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2.1.3 Signal Flow of the Receiving Part
2.1.3.1 Receiving Part Components
2.1.3.2 Maintenance Procedures of the Receiving Part
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