Fly FS554 Service manual
FS554 Service_Manual
Contents
1.Overview
1.1 FS554- brief introduction................................................................................................. 2
1.2 Function diagram ............................................................................................................... 3
1.3 Mainboard component distribution diagram ...................................................................... 3
1.4 Main IC Names .................................................................................................................. 4
2. RF................................................................................................................................................. 5
2.1 RF Overview ...................................................................................................................... 5
2.2 RF circuit description......................................................................................................... 5
2.3 WiFi/BT/GPS Part.............................................................................................................. 9
3. Baseband section.......................................................................................................................... 9
3.1 Outline................................................................................................................................ 9
.......................................................... 12
3.2.1 Power failure Check.............................................................................................. 12
3.2.2 Audio faults ........................................................................................................... 13
3.2.4 LCD Fault ............................................................................................................. 16
3.2.5 FM......................................................................................................................... 18
3.2.5 Bluetooth............................................................................................................... 19
3.2.6 WIFI fault.............................................................................................................. 19
3.2.6 Camera fault .......................................................................................................... 20
3.2.7 SIM card failure .................................................................................................... 21
3.2.8 Motor test is invalid .............................................................................................. 22
3.2.9 Gravity Sensor....................................................................................................... 23
3.2.10 T-Flash fault ........................................................................................................ 24
3.2.11Touch Panel function............................................................................................ 25
3.2.13 Cannot boot failure.............................................................................................. 26
1
1. FS554- overview
1.1 FS554- brief introduction
FS554-
2
1.2 Function diagram
1.3 Mainboard component distribution diagram
Mainboard TOP
3
Mainboard BOTTOM
1.4 Main IC Names
MTK_6737T
Baseband Chip
MT6737V/WT
eMMC+LPDDR3(16GB+16Gb,1.8/1.2V) KMQE10013M-B318007
eMMC+LPDDR3(16GB+16Gb)
4
crystal
2. RF
2.1 RF Overview
a TWO-band 900/1800 and two-band B1/B8 WCDMA/HSPA and Three-band B3/B7/B20
FDD mobile phone. The transmitter operates in a half-duplex for GSM and full-duplex for
WCDMA/HSDPA and FDD.
The majority of the phone circuitry consists: the MT6737V/WT Application and Modem
Processor,MT6328V power manage IC,MT6169 RF Transceiver , GSM Ant: AIROHA
AP6710M-31 Antenna switch and AIROHA PAAP7219M-R95MOG for
Band3/Band7/Band20/DCS1800/PCS1900/GSM850/EGSM900. The Diversity Antenna: Nationz
NZ5704 Antenna switch. And MT6625LN/A for GPS/ WIFI/BT/FM radio.
2.2 RF circuit description
2.2.1 The circuit description of receiving part
5
RF transceiver receiving ports
LTE PRX Antenna switch And 2G PA
6
LTE DRX Antenna port
2.2.2 The circuit description of transmitting part
WCDMA Band1 Duplexer
WCDMA Band8 Duplexer
7
LTE Band3 Duplexer
LTE Band7 Duplexer
LTE Band20Duplexer
8
2.3 WiFi/BT/GPS Part
3. Baseband section
3.1 Outline
3.1.1 Memory
9
3.1.2 Power Management
10
3.1.3 Battery
Lithium ion polymer battery
3.1.4 32KHzCrystal
3.1.5 SIM Card
3.1.6 Audio frequency
11
3.1.7 I/O Interface
3.1.8 Display
The main screen is 5.5-inch color screen 1776*1080 FHD
Before cutting board after the completion of the production line SMT X-RAY inspection,
according to the actual situation, X-RAY examination can not be found 100% badness, X-RAY
inspection may omissions some fault plate flow down. If found fault plate in the testing process,
the first step is to re-check of the X-RAY and carefully to see if there is even welding, lap welding,
Weld, if normal, analyze the situation following the positioning
3.2.1 Power failure Check
The failure phenomenon caused by a power failure: can not boot, shutdown leakage current
boot large current.
The main reason for the problem: Weld, electrical the original filtering or ESD device to
short-circuit, burning with the device is connected to a power source.
Positioning as well as steps to solve this type of problem is as follows
1 Troubleshoot and connected to the power supply components of the welding, Weld, or the
peripheral devices even tin
2 with a multimeter rule out whether there is power to short-circuit, and step by step to
troubleshoot the cause of the short (mainly: even tin, IC burned ESD protection device
breakdown, capacitor breakdown)
3 boot to test the power output is normal
If a power output value is not normal, whether the view filter capacitor welding problems,
whether the breakdown, filter capacitor is broken, replace; excluded one by one, and finally you
can navigate to the main chip damage
Each the power test position and the normal boot value is shown in the following table
12
3.2.2 Audio faults
The FS554-
s speaker circuit is as follow
13
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