Blu JENNY TV Service Manual
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Blu JENNY TV Service Manual

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Service Manual for JENNY TV

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Summary of Contents for Blu JENNY TV

  • Page 1 Service Manual for JENNY TV...
  • Page 2 CAUTIONS 1. Please read this service manual carefully and make sure all elements of anti-static are in place before the repair work is carried out. 2. Servicing and alignment MUST be undertaken by qualified personnel only. 3. Please use specified tools and equipments for servicing, in which the parameters need to be calibrated with specified criteria.

  • Page 3: Table Of Contents

    Content 1. Brief Introduction….………………………………………………………………………………….3 2. Exploded View……………………………………………………………………………………….4 3. Tools………………………………………………………………………………………………….5 4. Assemble & Disassemble Disassembly....…………………………………………………………………………...6-8 Assembly…………………………………………………………………………………………9-11 5. Picture of main board A&B side of PCBA……………………………………………………………………………….12 A&B of PCBA Layout……………………………………………………………….……………13 6. System Block Chart………………………………………………………………………………...14 7. Unit Circuit Map..........................16-21 8. Trouble Shooting Guide……………………………………………………………………………22-27 9.

  • Page 4: Specifications

    Chapter 1 Specification Features & Functions -Dual SIM Dual Standby Single Connection -Fashion bar phone -Multi-Media application -0.3Mega with SW upgrade 0.3M -T-Flash (Support 8G T Card) -2.4 QVGA240*320 -MP3, MP4, AVI, 3GP -USB1.1, Mini USB Specifications: Network: 850/900/1800/1900MHz Display: 2.4 QVGA 240*320 Camera: 0.3Mega Talk time: 600 min Stand-by: 240 hour...

  • Page 5: Tools

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

  • Page 6: Disassembly

    Customer Service Service Manual 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 7 Customer Service Service Manual 2. Assembly Process 1. Install the PCBA 2. Tear down the LCD protection film. 3. Tear down the protection film. 4. Install the rear cover module. 5. Fasten the 4 screws. 6. Install the back cover. Finished.
  • Page 8 Customer Service Service Manual Chapter 5 Picture of PCBA 5.1 Side A PCBA (Side A) Location of components Side A Keypad Connector Connector Camera connector 5.2 Side B PCBA (Side B) Location of Components Side B U705 BT IC J301 MT6622 T-flash connector U801 TV...

  • Page 9: A&B Of Pcba Layout

    Customer Service Service Manual 5.3 PCBA Layout side A 5.4 PCB Layout Side B...

  • Page 10: System Block Chart

    Customer Service Service Manual Chapter 6 System Block Chart NMI601 MT6250...

  • Page 11: Unit Circuit Map

    Customer Service Service Manual 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 12 Customer Service Service Manual 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 13 Customer Service Service Manual 7.1.2 Baseband - Keypad 7.1.3 Clock 32.768KHZ Circuit Clock signal transportation side 32.768 khz Clock crystal MT6250...
  • Page 14 Customer Service Service Manual 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 15 Customer Service Service Manual 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 16 Customer Service Service Manual 7.4 I/O connector circuit(PIN) Charging input Data download 7.5 System Overview The RF7176 simplifies the phone design by eliminating the need for the complicated control loop, harmonic filters, and TX/RX switch along with their associated matching components. The power control loop can be driven directly from the DAC output in the baseband circuit.
  • Page 17 Customer Service Service Manual 7.4 power amplifier frequency Start Power input antennal RF DC RF7176 Signal AC...
  • Page 18 Customer Service Service Manual 7.6 SIM circuit SIM 1Clock SIM 1 power SIM 1 Data SIM 1 reset SIM 2 Clock, reset SIM 2 power SIM 2 Data...
  • Page 19 Customer Service Service Manual System Overview The Media Tek MT5193 is a single chip universal analog television/FM receiver that integrates VHF/UHF full-band RF tuner, alignment-free multistandard TV/FM demodulator, audio processor, video processor, scalar/rotation functions, and power regulators. It is low power and high sensitivity device optimized for mobile applications such as handset, PDA, notebook, PMP, and other portable devices.
  • Page 20 Customer Service Service Manual 7.7 ATV Receive signal input Power supply TV signal output Power supply FM output...

  • Page 21: Trouble Shooting Guide

    Customer Service Service Manual 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 Disconnect the cable and check if the chipset...
  • Page 22 Customer Service Service Manual 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 the power manage supply output： VCCRE 1.8V VDD 2.8V AVDD 2.8V Replace or VTCXO 2.8V...
  • Page 23 Customer Service Service Manual 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 Re-weld Upgrade the software Check and replace I/O Check the power manage supply output：...
  • Page 24 Customer Service Service Manual 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...
  • Page 25 Customer Service Service Manual 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...
  • Page 26 Customer Service Service Manual 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 Check if 13 PIN of J701 have signal Upgrade software...
  • Page 27 Customer Service Service Manual 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...
  • Page 28 Customer Service Service Manual 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...
  • Page 29 Customer Service Service Manual 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...
  • Page 30 Customer Service Service Manual 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, SAW501 or SAW502,...
  • Page 31 Customer Service Service Manual No/Low sound from Speaker No sound or noise Remove the speaker and Press power on and side button to 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 32 Customer Service Service Manual Receiver low voice or no voice Receiver is low. Set the phone as Check if LS402 handsfree mode is damaged. Re-solder 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...
  • Page 33 Customer Service Service Manual 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 B402、 Replace B402 or B405 B405 is damaged.
  • Page 34 Customer Service Service Manual 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...
  • Page 35 Customer Service Service Manual 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 36 Customer Service Service Manual 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...
  • Page 37 Customer Service Service Manual 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 exceed 600mA）...
  • Page 38 Customer Service Service Manual 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...
  • Page 39 Customer Service Service Manual 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 Upgrade SW to check if open the camera function, it was related to SW. Check if C604、C605have 2.7V or 1.5V voltage Check if camera slot...
  • Page 40 Customer Service Service Manual ATV can’t work well ATV can’t work well SW upgrade Upgrade SW to check if problem can be fixed? Check if there is 1.2v start Check if R810、R811 voltage on R810、R811 0ohm was good. Check if there is 2.8v Voltage Replace power manage input on C807、C808? Check if there is 26Mhz clock...

  • Page 41: Cit Testing

    Customer Service Service Manual 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 mic. 3. Keypad: Press every button on the handset until the screen is clear. 4.

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