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Thread: HOT !!! How To Repair Different Faults in Mobile Phones

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    GsmIndia.in Active Teen al-gsm's Avatar
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    Default HOT !!! How To Repair Different Faults in Mobile Phones

    Here I will post general fault finding methods to repair different faults
    Step by Step method to repair different faults


    I invite everybody to share ur knowledge
    Last edited by al-gsm; 16-02-2008 at 11:53 PM.

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    GsmIndia.in Active Teen al-gsm's Avatar
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    There r three types of faults in mobile phones :
    1. Hardware Faults
    2. Software Faults
    3. Settings Faults
    Last edited by al-gsm; 16-02-2008 at 11:50 PM.

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    GsmIndia.in Active Teen al-gsm's Avatar
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    1. Hardware faults can be repaired by using hardware methods only i.e dry soldering, jumpering or change of SMDs,etc

    2. Software faults occur in mobiles if its OS (Operating System) gets corrupted.These faults can be repaired by flashing (reinstalling software). Flashing is possible only if u have flashing boxes. It is not possible to flash a mobile without boxes
    These r the common boxes used for flashing -
    Nokia : UFS Box, JAF Box, MT Box, Universal Box,etc
    Sony Ericsson : SE Tool Box, Cruisor,etc
    Motorola : Smart Clip Box, Ultima Box, Infinity Box,etc
    Samsung : NS PRO Box, UST PRO Box

    3. Settings faults r due to wrong change of settings. We first try to fix the particular setting. If we cannot make out which setting has problem we reset all settings through secret codes or use 'Full Factory Reset' option in the settings menu
    Last edited by al-gsm; 17-02-2008 at 12:17 PM.

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    GsmIndia.in Active Teen al-gsm's Avatar
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    These r the most common faults found in mobile phones :

    1. Mobile Phone Dead
    2. Insert Sim Card Problem
    3. Hanging Problem
    4. Network Problem
    5. Mic Problem
    6. Ringer Problem
    7. Speaker Problem
    8. Vibrator Problem
    9. Display Problem
    10. Mobile Restart/ Switch Off Automatically Problem
    11. Call Cut Off Problem
    12. Charging Problem
    13. Keypad Problem
    14. Sim Lock/ Mobile Lock Mobile
    15. Contact Service/ Contact Retailer/ Contact Manufacturer
    16. Battery Discharge Problem
    17. Gallery Not Opening Problem
    18. Camera Problem
    19. FM Radio
    20. LED Problem
    21. Memory Card Problem
    22. Bluetooth Problem
    Last edited by al-gsm; 16-02-2008 at 11:57 PM.

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    GsmIndia.in Active Teen al-gsm's Avatar
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    Please dont post here jumper solutions unless necessary

    I invite everybody to share ur knowledge

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    GsmIndia.in Active Teen al-gsm's Avatar
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    [SIZE="2"][COLOR="Blue"][I]How to Repair a Dead Mobile Phone :

    If the mobile phone does not switch on, it is called a dead mobile.
    It can be due to many reasons
    1. Water damage
    2. Fall down
    3. Not used for a long time ( Mostly battery is down)


    (1) Check the Battery. It should show 3.7 volts or as written on the battery.

    (2) Check the Battery Connector
    Check two things (a) Voltage coming or not (b) shorting
    Note : If there is shorting then clean the circuit in ultrasonic cleaner (Remove display, camera, etc before putting it in ultrasonic cleaner )
    Clean the circuit with a soft brush and make it dry with a hair dryer or blower.
    If the shorting does'nt go it may be due to shorting in an ic,capaicitor or circuit. if shorting is in ic u can check it by attaching a battery then press the on-off switch keep the battery for 10-15 seconds. after that remove the battery and check which ic bacomes hot. Reball or replace that ic. If shorting is in circuit it must be removed by ultrasonic cleaner
    Note - The circuit is made of three layers. if there is shorting in the middle layer it cannot be removed
    (3) Check the On/Off switch & voltage at on-off switch
    Note - Connect a charger. If charging is shown on display then the problem is with the on/off switch or software problem

    (4) Try flashing the mobile.

    (5) If flashing cannot be done then there is hardware fault we first dry solder the Flash IC & RAM IC and check in the Software. if flashing cannot be done then we dry solder/reball/replace flash ic & RAM ic.After that dry solder/reball/replace Power IC, Network IC, Crystal, CPU
    Last edited by baraka42; 11-08-2012 at 09:50 PM.

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    GsmIndia.in Active Teen al-gsm's Avatar
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    How to check shorting in mobiles -
    Last edited by al-gsm; 17-02-2008 at 12:27 AM.

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    Please dont post here jumper solutions unless necessary

    If u Like My Post Dont Feel Shy To Press Thanks!!!
    Last edited by al-gsm; 17-02-2008 at 12:36 AM.

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    GsmIndia.in Active Teen al-gsm's Avatar
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    HOW TO REPAIR INSERT SIM CARD PROBLEM

    If after inserting the sim card, it shows the message ‘Insert sim card’ or 'insert uim card' or 'offline mode' then it is called sim card problem.

    Solution :
    (1) Check the Sim Card connector
    (2) Clean the Sim Card connector contacts
    (3) If it is Soldered Sim Connector then refresh it
    with soldering iron
    (4) Also check the sim card
    (5) If there is Sim IC in the mobile dry solder
    (6) Replace the sim IC
    (7) Try Jumper Solution
    (8) The problem is from Power IC or UEM IC.Dry solder/reball/change it
    Last edited by al-gsm; 18-02-2008 at 08:24 PM.

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    GsmIndia.in Active Teen al-gsm's Avatar
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    After dry soldering sim ic if the problem is not solved,we replace the sim ic.
    If a new sim ic is not available we remove the sim ic and make this jumper on the circuit. After this throw away the sim ic
    This jumper will do the work of sim ic
    Last edited by al-gsm; 18-02-2008 at 07:49 PM.

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    sir,

    Get connect n enter the procedure used by all members so that a strong base with exceptional knowledge on mobile can be known to all of us.
    regards
    prans

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