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Message: <blockquote data-quote="laal" data-source="post: 10487455" data-attributes="member: 94459">How To Repair Different Faults in Mobile PhonesThere r three types of faults in mobile phones :1. Hardware Faults2. Software Faults3. Settings Faults1. Hardware faults can be repaired by using hardware methods only i.e dry soldering, jumpering or change of SMDs,etc2. 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 boxesThese r the common boxes used for flashing -Nokia : UFS Box, JAF Box, MT Box, Universal Box,etcSony Ericsson : SE Tool Box, Cruisor,etcMotorola : Smart Clip Box, Ultima Box, Infinity Box,etcSamsung : NS PRO Box, UST PRO Box3. 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 menuThese r the most common faults found in mobile phones :1.  Mobile Phone Dead2.   Insert Sim Card Problem3.   Hanging Problem4.   Network Problem5.   Mic Problem6.   Ringer Problem7.   Speaker Problem8.   Vibrator Problem9.   Display Problem10. Mobile Restart/ Switch Off Automatically Problem11. Call Cut Off Problem12. Charging Problem13. Keypad Problem14. Sim Lock/ Mobile Lock Mobile15. Contact Service/ Contact Retailer/ Contact Manufacturer16. Battery Discharge Problem17. Gallery Not Opening Problem 18. Camera  Problem19. FM Radio 20. LED Problem21. Memory Card Problem22. Bluetooth  ProblemHow 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 reasons1. Water damage2. Fall down3. 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 ConnectorCheck two things (a) Voltage coming or not (b) shortingNote :  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 cleanerNote - 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 switchNote - 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</blockquote>

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