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cromax X458 L3 Service Manual
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cromax X458 L3 Service Manual

Cromax x458 l3 smartphone
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X458
L3 Service Manual
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Summary of Contents for cromax X458 L3

  • Page 1 X458 L3 Service Manual...

  • Page 2: Table Of Contents

    X458 L3 Service Manual 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、...
  • Page 3 X458 L3 Service Manual Chapter 1 Specification Features & Functions  Dual SIM Dual Standby Single working  Full touch   Multi-Media application  0.3MP with sw upgarde to 1.3MP  T-Flash（Support 8G T Card）  3.5“ HVGA 320*480 MP3、MP4、AVI 、3GP ...

  • Page 4: Exploded View

    X458 L3 Service Manual Chapter 2 Exploded View...

  • Page 5: Tools

    X458 L3 Service Manual Chapter 3 Tools Solder iron Hot Air Gun Power Supply Multimeter Solder wire, Flux Tweezer Screw Driver Cable Wrist grounding strap Pick Antistatic gloves PC, Download cable Others...

  • Page 6: Assembly

    X458 L3 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 4. Unfasten the 2 screws by screw driver. 5. Remove the TP connector. 6.
  • Page 7 X458 L3 Service Manual 7. Remove the TP 8. Remove the LCD by electric soldering iron Finished.
  • Page 8 X458 L3 Service Manual 2. Assembly Process 2. Install the LCD by electric soldering iron 1. Install the TP 4. Fasten the 2 screws.. 3. Install the PCBA. 5. Install the back cover. 6. Fasten the 4 screws.. Finished.
  • Page 9 X458 L3 Service Manual Chapter 5 Picture of PCBA 5.1 Side A PCBA (Side A) Location of components Connector Camera connector 5.2 Side B PCBA (Side B) Location of Components I/O connector (U401) FLASH (J201)battery U101 U800 wifi conector chip (J401) Audio jack U301...

  • Page 10: A&B Of Pcba Layout

    X458 L3 Service Manual 5.3 PCBA Layout side A 5.4 PCB Layout Side B...

  • Page 11: System Block Chart

    X458 L3 Service Manual Chapter 6 System Block Chart...
  • Page 12 X458 L3 Service Manual Chapter 7 Circuit diagram for each unit Audio Processing Keypad Interface SIM Data Transfer control Data Transfer Interface T-flash Data transfer control...
  • Page 13 X458 L3 Service Manual...
  • Page 14 X458 L3 Service Manual Output of SIM Card...
  • Page 15 X458 L3 Service Manual CPU POWER SUPPLY OUTPUT PORT...
  • Page 16 X458 L3 Service Manual I/O Interface (5PIN)
  • Page 17 X458 L3 Service Manual Display interface...

  • Page 18: Trouble Shooting Guide

    X458 L3 Service Manual Chapter 8 Trouble shooting guide Can’t Download Cannot download Check if it is caused by the Power on PC, cable, tools etc. Replace or re-config. Replace or Check I/O Connector re-solder the I/O connector Connect the cable, check if Disconnect the cable the current is normal (about and check if the chipset...
  • Page 19 X458 L3 Service Manual Cannot power on-current swing instability Make the phone connect the power supply and find the current swing at 50-100mA Upgrade the software Check and replace the I/O connector Check the power manage supply output： VCCRE 1.8V VDD 2.8V Replace or AVDD 2.8V...
  • Page 20 X458 L3 Service Manual Cannot power on-low or no current Make the phone connect the power supply and find low or no current Check battery ， Clean connector and power reweld replace it Upgrade the software Check and replace I/O Check the power manage connector supply output：...
  • Page 21 X458 L3 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 22 X458 L3 Service Manual Repair flow for phone dead Phone dead Upgrade the software can Upgrade the 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 23 X458 L3 Service Manual 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 Clean/re-solder connector is OK or connector Change LCD FPC Problem solve Upgrade software Check if 13 PIN of J701 have signal...
  • Page 24 X458 L3 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 (e.g: 1/2/3, regular problem) work 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 25 X458 L3 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 软件升级 Use external power (2.8V) to Change LED check LED can work or not Changed or re-solder CPU MT6260...
  • Page 26 X458 L3 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 MT6260 Connect Power supply may be defective to check the current MT6250 may be defective...
  • Page 27 X458 L3 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 28 X458 L3 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 29 X458 L3 Service Manual Receiver low voice or no voice Receiver is low. Set the phone as Check if LS402 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...
  • Page 30 X458 L3 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 Replace B402 or B405 Check if inductor B402、 B405 is damaged.
  • Page 31 X458 L3 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 32 X458 L3 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 33 X458 L3 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 34 X458 L3 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 find the replace normal（no exceed 600mA）...
  • Page 35 X458 L3 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? Measure if Re-solder T-Flash slot pin 4 T-flash slot 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 36 X458 L3 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 、...
  • Page 37 X458 L3 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 38 X458 L3 Service Manual 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.
  • Page 39 X458 L3 Service Manual 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 40 X458 L3 Service Manual 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 41 X458 L3 Service Manual 9.1.8 Click the “Scatter/config file” and select the “scatTINNO36_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 42 X458 L3 Service Manual 9.1.10 Backup the data. (gray progress bar) 9.1.11 Connect to phone. (red progress bar)
  • Page 43 X458 L3 Service Manual 9.1.12 Downloading is in process. (blue progress bar) 9.1.13 Downloading is completed. Power on phone and input “*#84666*#”, select “one key Restore”, phone will be reboot, then the user’s 9.1.14 setting could be eliminated entirely.
  • Page 44 X458 L3 Service Manual 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 45 X458 L3 Service Manual 9.2 IMEI Writing Guide 9.2.1 Plug the correct upgrade cable to the computer, then run IMEI writer. For the first time you run IMEI Writer in the computer, below figure would be occur, then choose “IMEI_Writer.exe”.
  • Page 46 X458 L3 Service Manual Choose the “IMEI_Writer.exe”. Choose it 9.2.2 Refer to below figure to set up IMEI writer, power off the phone and then click “Restart”, after 3 seconds plug the phone cable connector to the phone and power on the phone, it starts to write IMEI. Click here to change the database file Write dual IMEI...

  • Page 47: Cit Testing

    X458 L3 Service Manual 9.2.3 After several seconds, it shows the IMEI is written to the phone successfully. 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.
  • Page 48 X458 L3 Service Manual...