cromax X245 Service Manual Download Page 11

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X245 L2 Service Manual

N0/WEAK SIGNAL TROUBLE SHOOING

No or weak

signal

Inspect the antenna and

antenna connector to see

if there’s any distortion

Replace the

defective

components.

Check and replace RF

connector to see if there

’s

any signal

Replace RF

coaxial line

Replace the PCBA.

YES

Check and replace RF

coaxial line to see if

there’s

any signal

YES

Replace RF

connector

Summary of Contents for X245

Page 1: ...X245 L2 Service Manual SERVICE MANUAL ...

Page 2: ...se 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 CONTEN...

Page 3: ...anual CHAPTER1 INTRODUCTION SPEC Network 2 band 850 1900 900 1800 Size 120 49 8 12 65mm Lithium Battery 1000MAH USB Micro USB 2 0 Main Function Bar functionphone MT 6260M 2 4 QVGA 320 240 0 3 Mega H 1 3 Mega S Dual SIM ...

Page 4: ...RVICE TOOLS Voltage regulator Multimeter Iron Hot air gun Solder wire soldering paste Computer and software download cable Metal tweezers Screw driveretc Pick Driver Tweezers Wrist groun ding strap Antistatic gloves SW upDownlo ad cable ...

Page 5: ... Keypad bug by no function J401 Earphone connector Bug by damaged Earphone no audio U101 CPU Bug by damaged Can t power on No RF signal No display or display abnormality J404 T Flash connector Bug by damaged Can t Access T card J405 I O connector Bug by damaged No charge U302 RF PA Bug by damaged No signal Large current J201 Battery connector Bug by damaged Not power on ...

Page 6: ...X245 L2 Service Manual Side A layout Side B layout ...

Page 7: ...WING INSTABILITY Upgrade the software is normal Cannot power on Replace the structuralmember Check the battery is normal Check the battery connectorin normal Replacethe PCBA is normal Replace the battery NO NO yes NO Replace the battery connector yes yes Replace the PCBA NO ...

Page 8: ...efect issue Clean and reinstall the keypad or replace the touch panel Check battery connector and battery touch point if is dropped or dirty Check the keypad if stuck or touch panel do not work to make the phone dead Replace the PCBA Clean or replace the battery or battery connector YES YES No No No ...

Page 9: ...bnormality after power on Check LCD connector is OK or not Change LCD connector can settle the defect issue Replace the PCBA Check LCD if damage or liquid flow out Change LCD Yes Clean or reweld the LCD connector Yes Change the LCD can settle the defect issue No Upgrade software No ...

Page 10: ...eplace the PCBA Insert SIM Clean or replace SIM connector Clean or reweld the SIM connector Check SIM connector is OK or not OK Check if all the SIM pins are clean NO Check FPC on SIM connector is OK or not NO Replace FPC NO Upgrade softwarecan settle the defect issue NO ...

Page 11: ...a and antenna connector to see if there s any distortion Replace the defective components Check and replace RF connector to see if there s any signal Replace RF coaxial line Replace the PCBA YES YES Check and replace RF coaxial line to see if there s any signal YES Replace RF connector NO NO ...

Page 12: ...EAKER Set the phone as normal mode Replace the PCBA No sound or noise Remove the speaker and measure with multimeter to see if there s any sound Replace speaker The phone is inSilent mode Check and replace FPC is ok or not Replace FPC Yes NO yes ...

Page 13: ... VOICE Measure the signal with oscillograph under calling mode Receiver is low Check if receiver connector is damaged Resolder or clean the receiver connector Check if the receiver is broken or damaged Yes NO NO Replacethe receiver Replace the PCBA ...

Page 14: ...No Low sound from MIC NO Yes YES Check if there s MIC cover Install the MIC cover Press power on and side buttonto test mode and activate echo loop Replace the MIC Replace FPC to check if the problem is solved Replace the FPC Replace the PCBA YES ...

Page 15: ...ge good one Upgrade the software is normal No charge DOES NOT CHARGE NO CHARGE IN YES NO NO NO NO Change battery Check if I O connector works normal Check and replace FPC is normal YES Replace the PCBA Replace the charger or cable without Re solder or replace the I O connector Replace the FPC ...

Page 16: ... read T Flash card NO NO Check if T Flash slot appearance was ok Replaced the T Flash slot Check if T Flash FPC is normal Re solder or replace FPC NO Check if the T Flash connector is normal Re solder or replace the T Flash connector Replace the PCBA NO ...

Page 17: ...NO WIFI or BT or FM or GPScan t open Can t work normal Software update and check the function is OK or not Upgrade Software Check the WIFI or GPS antenna is normal Check WIFI or GPS RF connector is normal Replace the RF connector Replace the PCBA NO Replace the antenna ...

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