BLU Products Jenny Service Manual
  1. Manuals
  2. Brands
  3. BLU Products Manuals
  4. Cell Phone
  5. Jenny
  6. Service manual

BLU Products Jenny Service Manual

Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
BLU Jenny
Service Manual
1

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the Jenny and is the answer not in the manual?

Questions and answers

Related Manuals for BLU Products Jenny

Summary of Contents for BLU Products Jenny

  • Page 1 BLU Jenny Service Manual...
  • Page 2 CAUTIONS Boards, which contain Electrostatic Sensitive Device(ESD), art indicated. Following information is ESD handling: Service personnel should ground themselves by using a wrist strap when exchange system boards. When repairs are made to a system board, they should spread the floor with anti-static mat which is also grounded. Use a suitable, grounded soldering iron.

  • Page 3: Table Of Contents

    Content 1. Brief Introduction….…………………………………………………………………………………...3 2. Exploded View………………………………………………………………………………………….4 3. Tools……………………………………………………………………………………………………..5 4. Assemble & Dissemble Disassembly....…………………………………………………………………………..6 Assembly………………………………………………………………………………………….…..7 5. Picture of main board A&B side of PCBA .…………….…………………………………………………….…………….8 A&B of PCBA Layout………….….………….…………………………….………………….……..9 6. System Block Chart…………………………………………………………………………………...10 7. Unit Circuit Map ………………………………………………………………………..…...
  • Page 4 Chapter 1 Specification Jenny T172i Features & Functions -Dual SIM Dual Standby Single Connection -Fashion bar phone -Multi-Media application -0.08Mega with sw upgrade 0.3M -T-Flash（Support 8G  -T Card）1.8“TFT 128*160 -MP3、MP4、AVI 、3GP   -USB1.1，Mini USB Specification: Network: 850/900/1800/1900MHz Display: 1.8“TFT 128*160...

  • Page 5: Exploded View

    Chapter 2 Exploded View 1. Lens Protect film 2. Lens 3. Receiver dust gauze 4. Lens gum 5. Front cover 6. LCD foam 7. LCD 8. Main PCBA 9. White LED 10. 3 in 1 speaker 11. Speaker seal foam 12.

  • Page 6: Tools

    Chapter 3 Tools Solder iron Hot Air Gun Power Supply Multimeter Solder wire, Flux Tweezers Screw Driver Cable Wrist grounding strap Pick Antistatic gloves Others PC, Download cable...

  • Page 7: Disassembly

    Chapter 4 Disassembly & Assembly 1. Disassembly Process 2. Unfasten the 4 screws by screw driver 1. Remove the battery cover 3. Prize up the back cover by pick 4. Stick protection film for LCM. 5. Stick protection film for front cover. 6.
  • Page 8 2. Assembly Process 1. Install the PCBA 2. Tear down the LCD protection film. 4. Install the rear cover module. 3. Tear down the protection film. 5. Fasten the 4 screws. 6. Install the back cover. Finished.
  • Page 9 Chapter 5 Picture of PCBA 5.1 Side A PCBA (Side A) Location of components Side A Keypad LCD connector Connector 5.2 Side B Side B PCBA (Side B) Location of Components J301 J601 camera T-flash connector connector U101 U502 RF J201 battery J502、J503 U501...

  • Page 10: A&B Of Pcba Layout

    5.3 PCBA Layout side A 5.4 PCB Layout Side B...

  • Page 11: System Block Chart

    Chapter 6 System Block Chart MT6250...
  • Page 12 Chapter 7 Unit Circuit 7.1.1 System Overview MT6250 is a GSM/GPRS handset chip solution which integrates RF, analog baseband, digital baseband as well as Power Management Unit(PMU) and can greatly reduce the component count and make a smaller PCB size MT6250 including Bluetooth and FM. Besides, MT6250 is capable of Single Antenna Interference Cancellation (SAIC) and AMR speech Based on a 32-bit ARM7EJ-S RISC...

  • Page 13: Unit Circuit Map

    Chapter 7 Unit Circuit 7.1.2 Baseband & CPU MT6250 Audio circuit CAMERA Data transportation Keypad control side connector circuit BT Data transportation Data control side transportation circuit...
  • Page 14 7.1.2 Baseband - Keypad 7.1.3 Clock 32.768KHZ Circuit Clock signal transportation side 32.768 khz Clock crystal MT6250...
  • Page 15 7.1.4 CPU to Flash FLASH data transportation side 7.1.5 SIM data output MT6250 SIM 2 Clock SIM 2 Data SIM 1 Clock SIM 1 Data SIM 1 reset SIM 2 reset...
  • Page 16 7.2 MT6250 CPU Power output item voitage current Vcore 1.2v 200ma 2.8v 100ma Vadd 2.8v 150ma Vtcxo 2.8v 20ma Vrtc 1.2v 200ma Vmem 2.8v 150ma Vsim 2.8v 20ma 2.8v 200ma 1.8v 150ma 7.3 Battery connector Positive pole Temperature detection...
  • Page 17 7.4 I/O Interface (10 PIN) Charge input SW downloads side Data transportation 7.5 System Overview The SKY77568 is a dual-band transmits and receive front-end module (FEM) with integrated power Amplifier control (iPAC) for cellular handsets comprising GSM850, GSM900, DCS1800 and PCS1900 operation. The FEM has capability in applications of US and euro dual-band platforms.
  • Page 18 7.6 power amplifier Frequency Start Power input Antennal RF DC SKY77568 Signal AC...
  • Page 19 7.7 SIM circuit SIM 1 power SIM 1Clock SIM 1 Data SIM 1 reset SIM 2 power SIM 2 Clock SIM 2 Data SIM 2 reset...

  • Page 20: Trouble Shooting Guide

    Chapter 8 Trouble shooting guide Can’t Download Cannot download Check if it is caused by the PC, cable, tools etc. Power on Replace or re-config. Replace or Check I/O Connector re-solder the I/O connector Connect the cable, check if the current is normal (about YES Disconnect the cable and check if the chipset 30 mA)
  • Page 21 Cannot power on-current swing instability Make the phone connect the power supply and find the current swing at Upgrade the Check and replace the I/O connector Check power manage supply output： VCCRE 1.8V VDD 2.8V AVDD 2.8V Replace or VTCXO 2.8V reweld CPU VMEM 2.8V VRTC 1.2V...
  • Page 22 Cannot power on-low or no current Make the phone connect the power supply and find low or no ， Check the battery Clean connector and power reweld Upgrade the software Check and replace I/O Check power manage supply output： VCCRE 1.8V VDD 2.8V Replace or AVDD 2.8V...
  • Page 23 Cannot Power on-large current Make the phone connect the power supply and then press power key find large current make the phone heat Check if the phone leakage (current 0mA is normal) Use the Check and touch replace RF method to PA, Audio Check if the capacitance, varistor, LDO tube leakage...
  • Page 24 Repair flow for phone dead Phone dead Upgrade the Upgrade the software can settle the defect issue? Software. Check battery connector Clean or replace the battery and battery touch point if or battery connector. is dropped or dirty? Check the keypad if stuck or Check and reinstall the keypad touch panel do not work to or replace the touch panel.
  • Page 25 No display or display abnormality No display or display abnormality after power on Check LCD if damage or Change LCD liquid flow out Check LCD connector Clean/re-solder is OK or not connector Change LCD FPC Problem solve Upgrade software Check if 13 PIN of J701 have signal or not, check 8 digit cable status...
  • Page 26 Test process for Key can’t work Key can’t work All key can’t Some of key can’t work Single key can’t work work (e.g: 1/2/3, regular problem) Clean it Upgrade software Use multimeter to check if to check if can the voltage is 0.7V or not solve this problem Visual check if any corrosion or short Clean the place...
  • Page 27 Key light can’t work Key light can’t work Reassemble FPC Expect bar model Use multimeter to check Check if circuit is voltage of LED is OK or not broken Upgrade software Problem solve Use external power (2.8V) to Change LED check LED can work or not Changed or re-solder CPU MT6250 Problem solve...
  • Page 28 Insert SIM Repair Process Insert SIM Clean or replace Check if all the SIM connector. SIM pins are clean Resolved If SIM card Replace SIM card is available CPU MT6250 Connect Power supply may be defective to check the current MT6250 may be defective Resolder or replace...
  • Page 29 N0/weak signal trouble shooing No or weak signal Inspect the antenna and Replace the defective antenna connector to see components. if there’s any distortion Put a false antenna at RF PA Replace RF PA IC. IC to see if there’s any signal Make a false antenna at Saw filter is damaged, Z501, check if there’s...
  • Page 30 No/Low sound from Speaker No sound or noise Remove the speaker and Press power on and side button to NO measure with multimeter to check if there’s the ring is normal see if there’s any sound. Set the phone as The phone is in Replace speaker.
  • Page 31 Receiver low voice or no voice Receiver is low. Set the phone as Check if LS401 handsfree mode is damaged. Resolder clean LS401 Check if the receiver Replace the is broken or damaged receiver. Test if there’s sound from Replace receiver receiver with multimeter Measure the signal with oscillograph...
  • Page 32 No/Low sound from MIC No/Low sound from MIC Check if there’s Install the MIC cover MIC cover *#84666*# and activate echo loop, measure MIC MK400 Replace MIC voltage is 1.5V、0.7V Check if inductor B401、 Replace B401 or B402 B402 is damaged. Measure C431\C432 with Replace multimeter to see if there’s...
  • Page 33 Does not charge - remind error 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 capacitor C251、resistor R214\R205 be normal Replace Check charge protective tube re-solder U200 be normal.
  • Page 34 Does not charge - no charge No charge Change battery Re-flash SW Check charger and cable without problem, or change good one Check if I/O connector works normal Connect the charger without battery put in, check if the voltage of positive pole is around 3.6V.
  • Page 35 Does not charge - does not recognize charging If recognize “charger connected” There is no symbol shows charging Re-solder or replace Power on and connect charger, input *#84666*# to check if connector ADC is around 0.40A Change battery Re-flash SW Connect the charger without battery put in, check if the voltage of positive pole is around 3.6V.
  • Page 36 Stand-by short time Stand-by short time Change battery Re-flash SW Connect the phone with Voltage regulator, the current should be zero Power on the phone, check the if working current be By touch to Check and normal（no excede 600mA） replace find the RF- PA, component...
  • Page 37 Can’t read T-Flash card Can’t read T-Flash card Check if T-Flash Replaced the slot appearance T-Flash slot was ok? Re-solder Measure if T-flash slot T-Flash slot pin 4 VMC was 2.8V. Check if the voltage of T-Flash Measure if there is pin pin3/pin5/pin7 to the ground was around short for the T-flash 0.7V with multimeter diode column...
  • Page 38 Can’t successfully take picture Can’t successfully take pictures. Re-install the camera and check if it can work well. Power on the PCBA and open the camera function, Upgrade SW to check if it was related to SW. Check if C606、C608 have 2.7V or 1.5V voltage Check if camera slot Re-solder or replace...
  • Page 39 Chapter 9 Firmware Upgrading Guide 9.1 Firmware Upgrading 9.1.1 Install USB driver The maximum downloading speed can be up to 921600bit/s when using USB-Serial cable. The driver need to be installed before using the USB cable. Please keep the USB cable unplugged when installing the driver. Plug the USB cable when installing is completed.
  • Page 40 9.1.4 Select “Options”-“Format FAT (DISABLED)…” and please do NOT select “validation”. 9.1.5 Please select “Format FAT”. Select “Format FAT”...
  • Page 41 9.1.6 Select “Options”- “Backup and Restore”, then select the “Backup -> Download/format -> Restore”. 9.1.7 Click the ”Download Agent” and select the file “MTK-ALLInOne-DA.bin”. Select this one...
  • Page 42 9.1.8 Click the “Scatter/config file” and select the “scat36_11A_GEMINI.txt”. Select this one 9.1.9 Power off the handset, remove the battery, click “Download”, and connect the cable with handset, then insert the battery, press the power on button, the gray, red, blue, green and gray progress bar shall appear. Then upgrade would be completed when appear “OK”.
  • Page 43 9.1.10 Backup the data. (gray progress bar) 9.1.11 Connect to phone. (red progress bar)
  • Page 44 9.1.12 Downloading is in process. (blue progress bar) 9.1.13 Downloading is completed. 9.1.14 Power on phone and input “*#84666*#”, select “one key Restore”, phone will be reboot, then the user’s setting could be eliminated entirely.
  • Page 45 Description: can’t power on(also upgrade software fail) Root cause: red scroll 100% run completely when upgrade software, the detail as figure 1, also it prove power supply, clock is normal and defective typical issue is focus on CPU or FLASH poor soldering or damage, and maybe software do not fit for hardware.

  • Page 46: Cit Testing

    Chapter 10 CIT Testing Input “*#84666*#” in the standby mode. 1. Version: Confirm the firmware version. 2. Echo Loop: Receiver shall produce sound when blowing over the microphone. 3. Keypad: Press every button on the handset until the screen is clear. 4.

Table of Contents