FLY FS501 Service Manual
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FLY FS501 Service Manual

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FLY SERVICE SUPPORT
Service Manual
FS501
V1.0

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Summary of Contents for FLY FS501

  • Page 1 FLY SERVICE SUPPORT Service Manual FS501 V1.0...

  • Page 2: Table Of Contents

    FLY SERVICE SUPPORT Contents 1. FS501 key features ....................... 3 1.1 FS501 brief introduction ..................... 3 1.2 Function diagram ........................ 4 1.3 Mainboard component distribution diagram ............... 5 1.4 Main IC Names ........................7 2. RF ............................8 2.1 WCDMA RF power trouble ....................8 2.2 GSM RF power trouble......................9...

  • Page 3: Fs501 Key Features

    FLY SERVICE SUPPORT 1. FS501 key features 1.1 FS501 brief introduction The development and design of the FS501 PCBA is based on SC7731G platform. The mainboard system mainly consists of the chip which are responsible for three part functions, namely, baseband, SC7731G+SR2351C +SR3131, radio frequency and GPS/WIFI/BLUETOOTH/FM chip.

  • Page 4: Mainboard Component Distribution Diagram

    FLY SERVICE SUPPORT 1.3 Mainboard component distribution diagram Mainboard TOP...
  • Page 5 FLY SERVICE SUPPORT Mainboard BOTTOM...

  • Page 6: Main Ic Names

    FLY SERVICE SUPPORT 1.4 Main IC Names Name Product model location SC7731G;SC7731G;597;FCVFBGA;13.3X12.1;040;BB SC7731G U0100 ;WCDMA MEM,P-VFBGA162,4GB/4Gb,6/1.9nS,e- MMC/LPDDR2,4Gbx8/128Mx32,1.8V/3.3V,MCP,1.8/1 TYC0FH121638RA U0500 .2V,13*11.5*1.0 SR2351C;38;QFN;5.5x4.5;040;RF SR2351C U801 SR2319A;16;QFN;2.5*2.5;050; SR2319A U803 U805 SAW滤波器-1575.42MHZ-0.9DB-1.4*1.1*0.6 SAFEB1G57KE0F00 U806 LNA;GPS/GNSS;1x1.5x0.75mm MXDLN16G U807 XTL,TCXO,SMT,26.000MHz,0.5PPM NT2520SB-ENG3216E Y801 1.8V,2.5x2x0.8mm BF2012-L2R4-NBA- Multilayer Chip Band-Pass Filters -2.4GHz...

  • Page 7: Wcdma Rf Power Trouble

    FLY SERVICE SUPPORT WCDMA RF power trouble Check points -PA connector soldering -Duplexer connector soldering -Other Tx RF Component soldering Wcdma Band I Wcdma Band VIII...

  • Page 8: Gsm Rf Power Trouble

    FLY SERVICE SUPPORT Start Check PA connector Resoldering soldering is ok? Check Dupolexer Resoldering connector is ok? Check Other Tx RF components Resoldering soldering is ok? Replace PA GSM RF power trouble Check points -Tranceiver connector soldering -PA connector soldering...
  • Page 9 FLY SERVICE SUPPORT...

  • Page 10: Wcdma Rx Trouble

    FLY SERVICE SUPPORT 2.3 WCDMA RX trouble Check points -Tranceiver connector soldering -Duplexer connector soldering -ASM switch connector soldering -Other Rx RF Component (L/C) soldering...
  • Page 11 FLY SERVICE SUPPORT Start Check Traceiver connector Resoldering soldering is ok? Check Duplexer Resoldering connector is ok? Check Other ASM Switch soldering is Resoldering Check Other components(L/C) soldering...

  • Page 12: Gsm Rx Trouble

    FLY SERVICE SUPPORT 2.4 GSM RX trouble Check points -Tranceiver connector soldering -ASM switch connector soldering -Rx SAW filter connector soldering -Other Rx RF Component (L/C) soldering...
  • Page 13 FLY SERVICE SUPPORT Start Check Traceiver connector Resoldering soldering is ok? Check ASM Switch Resoldering is ok? Check Rx SAW filter soldering is Resoldering Check Other components(L/C) soldering...

  • Page 14: Wifi/Bt/Bt Part

    FLY SERVICE SUPPORT 2.5 WiFi/BT/GPS Part 2.5.1 WIFI/BT/GPS Part...
  • Page 15 FLY SERVICE SUPPORT WIFI BT share RF access, signal is entered by antenna, through U808 2.4GHZ filter, filter sideband unwanted signal. The clock uses 26M clock provided separately. Data transfer interface and audio interface are directly connected to the CPU. Interface has SDIO is used for the WIFI signal transmission; PCM is used for the BT signal transmission.

  • Page 16: Outline

    FLY SERVICE SUPPORT 3.1 Outline Baseband circuit completes main functions: the procedure data storage, keyboard input, and the communication between the RF module, RF power control, the control of the power management module, RUIM card interface, serial download interface, Camera, T-flash, Bluetooth, and MMI (man-machine interface, such as the display, backlight, buzzer, speaker, microphone, motors, etc.).

  • Page 17: Common Failure Analysis And Maintenance

    FLY SERVICE SUPPORT 3.1.7 I/O Interface I/O Connector MICRO USB interface standard. Mainly used for software, download picture messages。 3.1.8 Display The main screen is 5.0 inch。 5.0-inch color screen FWVGA 3.2 Common Failure Analysis and Maintenance 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.

  • Page 18: Audio Faults

    The audio part has main four parts including the speaker, receiver, mic and headphone. First undesirable phenomena distinguish what part of the problem, and then analyzed according to the following respective module. （1）Speaker loop The FS501 phone’s speaker circuit is as follow Speaker Loop Speaker Common faults and reasons： 1,SPK Ringtones reasons:...
  • Page 19 FLY SERVICE SUPPORT 2) software problems, itself boot ringtones; (2) Receiver circuit FS501 phone receiver is embedded in the mobile phone front shell through shrapnel and motherboard connection. Mainly used for the call. Receiver circuit diagram as shown below. Receive Loop Receiver Common faults and reasons：...
  • Page 20 2) software problems. Main MIC （ 4） Headphone loop FS501 phone use headphones with a standard 3.5mm headphone. Its circuit diagram is as follows: Headphones common faults and reasons: 1, headphones only one channel sound: 1) the headset is not inserted in place 2) Relevant component Weld 3) Relevant component breakdown shorted to ground;...
  • Page 21 FLY SERVICE SUPPORT 3, unplug the headphones bank borrowing does not recognize: 1) Relevant component Weld 2) whether headphones Block shrapnel and motherboard good contact 3) software reasons 4, headset MIC no transmitter: 1) the headset is not inserted in place 2) Relevant component Weld 3) Relevant component breakdown on short-circuit;...

  • Page 22: Lcd Fault

    FLY SERVICE SUPPORT 3.2.3 LCD Fault 5.0-inch HVGA LCD, The part of the circuit schematic as shown below. Common problems and causes of the LCD module: 1, LCD screen is blank 1) LCD is not installed or and fixture poor contact...
  • Page 23 FLY SERVICE SUPPORT lcd connector 2, LCD blurred screen and white screen. Description LCD backlight circuit OK, just shows abnormal. The cause of the malfunction is usually: 1) LCD connector poor contact, poor welding and fixture poor contact 2) related components Weld or even tin short circuit 3) software problems 3, LCD black spots, bright spots, black lines, stripes Failure: LCD ontology bad.

  • Page 24: Camera Fault

    FLY SERVICE SUPPORT 2) surrounding environment is bad, such as plant, garage, etc. FM signals itself is weak or no FM signals source 3) FM antenna circuit exists poor soldering or short circuit, lead to unable to receive FM signals or FM signals leak 4) software reason 2，FM without sound reasons or murmur...

  • Page 25: Sim Card Failure

    Front camera 3.2.6 SIM card failure FS501 SIM card module circuit is connected directly with PMIC through eight-path signal from SUIM slot. The major failure of the module does not know the card, the reason usually: 1) USIM card GSM card and USIM deck poor contact...

  • Page 26: Gravity Sensor

    SIM card circuit 3.2.7 Gravity Sensor FS501 G-Sensor circuit is very simple, Power offer power to the Sensor IC power, I2C bus transfer command and data. G-Sensor faults and the reasons: 1, Sensor without functions: whether the paster is OK...

  • Page 27: T-Flash Fault

    FLY SERVICE SUPPORT 3.2.8 T-Flash fault FS501 T - Flash circuit is connected with CPU through the special SDIO bus, circuit diagram shown below. T - Flash the common faults and reasons are: 1, T–Flash read-write test is failure 1) T - flash for fault card or and T kaka seat have had no contact with good 2) below the resistance there may be short circuit, or virtual welding phenomenon.

  • Page 28: Cannot Boot Failure

    FLY SERVICE SUPPORT 2, Touch Panel function NG, at present is mainly due to FPC itself partial long cause, the I2C initialization failed; TP circuit 3.2.10 Cannot boot failure Can't boot failure is the phone fault with highest probability of occurrence. Software problems, welding problem, device failure is the main factor causing failing to boot.
  • Page 29 FLY SERVICE SUPPORT 1）can try to re-download the software 2）replace memory 4, Current is large when boot. LCD displays normally, even can enter the IDIE interface, single board is very hot 1) The individual power circuit short circuit to ground phenomenon exists in the phone, which is usually the problem that ESD protective devices of module circuit breakdown short circuit to ground or weld problems.

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