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FLY IQ4400 Service Manual
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FLY IQ4400 Service Manual

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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.
Servicing and alignment must be undertaken by qualified personnel only.
Ensure all work is carried out at an anti-static workstation and that an anti-static wrist strap is worn.
Use only approved components as specified in the parts list.
Ensure all components, modules, screws, and insulators are correctly re-fitted after servicing and alignment
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.
PMIC
Base Chip Set
Transceiver
Camera DSP/MMP
All manuals and user guides at all-guides.com
Fly IQ4400 Service Manual
Product Hardware Introduction
BB
FLY SERVICE SUPPORT
MT6571A/E
MT6323
MT6571A/E
/

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Summary of Contents for FLY IQ4400

  • Page 1 All manuals and user guides at all-guides.com FLY SERVICE SUPPORT Fly IQ4400 Service Manual CAUTIONS Please refer to the phone’s user’s guide for instructions relating to operation, care, and maintenance, which include important safety information. Servicing and alignment must be undertaken by qualified personnel only.
  • Page 2 All manuals and user guides at all-guides.com FLY SERVICE SUPPORT VC5278 RFPA MT6627* MT6627* AW8736FCR Audio CODEC&PA KE4CN2L2HA5A2A Memory TP IC 4.0” ，IC:FT6206 Backlight Driver Peripheral Rear camera:2.0 IC：SP2529 Front camera:0.3IC：SP0A19 CAMERA Configuration Memory Card PIFA antenna Antenna 0.2mA Leakage current 5.2mA...
  • Page 3 All manuals and user guides at all-guides.com FLY SERVICE SUPPORT Fly IQ444 Main function * 4.0, 480*800 TFT LCD *MTK6571 (78MHz)，32Mb+16Mb * Dual SIM stand by *Camera： Rear 2.0MP Camera AF Front camera:0.3MP *BT, FM *Multimedia player *T-Flash Up to 32 GB...

  • Page 4: Service Tools

    All manuals and user guides at all-guides.com FLY SERVICE SUPPORT SERVICE TOOLS Iron Hot air gun Voltage regulator Multimeter Solder wire, soldering paste Tweezers Driver upDownlo ad cable Wrist groun ding strap Pick Antistatic gloves Metal tweezers, Screw driver etc...

  • Page 5: Disassembly And Assembly

    All manuals and user guides at all-guides.com FLY SERVICE SUPPORT DISASSEMBLY AND ASSEMBLY...
  • Page 6 All manuals and user guides at all-guides.com FLY SERVICE SUPPORT...
  • Page 7 All manuals and user guides at all-guides.com FLY SERVICE SUPPORT...
  • Page 8 All manuals and user guides at all-guides.com FLY SERVICE SUPPORT...
  • Page 9 All manuals and user guides at all-guides.com FLY SERVICE SUPPORT CIRCUIT INSTRUCTION PCBA A-Side Audio PA Memory AW8736FCR MT6571A/E KE4CN2L2HA5A2A PMIC MT6323 BT/WIFI/GPS/FM RF PA MT6627* VC5278...
  • Page 10 All manuals and user guides at all-guides.com FLY SERVICE SUPPORT SYSTEM BLOCK DIAGRA UNIT CIRCUIT PRINCIPLE INTRODUCTION Baseband CPU circuit introduction for power supply part circuit MT6571A/E...
  • Page 11 All manuals and user guides at all-guides.com FLY SERVICE SUPPORT...
  • Page 12 All manuals and user guides at all-guides.com FLY SERVICE SUPPORT Interface Interface TF Card Interface...
  • Page 13 All manuals and user guides at all-guides.com FLY SERVICE SUPPORT...
  • Page 14 All manuals and user guides at all-guides.com FLY SERVICE SUPPORT BT/WIFI//GPS/FM circuit Audio PA circuit...
  • Page 15 All manuals and user guides at all-guides.com FLY SERVICE SUPPORT RF circuit...
  • Page 16 All manuals and user guides at all-guides.com FLY SERVICE SUPPORT...

  • Page 17: Troubleshooting Guide

    All manuals and user guides at all-guides.com FLY SERVICE SUPPORT TROUBLE SHOOTING GUIDE Cannot switch on Phone connect current is about 50-100mA and cannot switch on Update software Check and replace I/O connector Check power output： Centre supply VCORE Replace or 1.2V...
  • Page 18 All manuals and user guides at all-guides.com FLY SERVICE SUPPORT BT+FM chip cannot work normally cannot download cannot download Check phone Check battery is OK or not switch on or not Check applications, Re-install USB driver and USB cable, software is...
  • Page 19 All manuals and user guides at all-guides.com FLY SERVICE SUPPORT Does not charge Remind error during charge Remind: “fault connection” “battery overheat” Change battery Re-flash SW Check battery connector testing Pin, if the bias resis and vatge be normal. Check U302,R301,R303,R307 be Replace normal.
  • Page 20 All manuals and user guides at all-guides.com FLY SERVICE SUPPORT No display or display abnormality No display or display abnormality after power on Check LCD if damage Change LCD or liquid flow out Check LCD FPC is Clean/re-solder OK or not...
  • Page 21 All manuals and user guides at all-guides.com FLY SERVICE SUPPORT No/Low sound from Speaker No sound or noise Remove the speaker and check if there’s the ring is measure with multimeter to normal see if there’s any sound. Set the phone as The phone is in Replace speaker.
  • Page 22 All manuals and user guides at all-guides.com FLY SERVICE SUPPORT Receiver low voice or no voice Receiver is low. Set the phone as handsfree mode Check if the receiver Replace the is broken or damaged receiver. Test if there’s sound from...
  • Page 23 All manuals and user guides at all-guides.com FLY SERVICE SUPPORT CIT TEST 1. Insert T-Flash card and SIM card. After power-on, press *#37*# to enter factory mode for CIT test. 2. Choose Full test menu. To do full test. 3. Test relative items one by one:...