How to Repair a Dead Mobile Phone - GSM-Forum

akram855 · 01-10-2010, 19:49

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 ****er.
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

chohansahib · 01-10-2010, 23:19

thanxxxxxx for info for new engineers .........

chetanmaturkar7 · 01-11-2010, 04:28

very very nice solution.keep it up............................................

Subrat Patra · 01-11-2010, 14:16

Quote:

Originally Posted by akram855

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 ****er.
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

Many many thanks for the post

01-10-2010, 19:49	#1 (permalink)
akram855 Freak Poster Join Date: Aug 2009 Posts: 387 Member: 1102317 Status: Offline Thanks Meter: 180	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 ****er. 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

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
How to Repair a Dead Mobile Phone	akram855	Various CDMA/TDMA Cell Phones	21	08-16-2016 12:01
@@@...How To Repair A Dead China Phone by mobi_soft...@@@	mobi_soft	Chinese Models & Cloned Phones	7	07-21-2014 08:51
How to repair liquid damage mobile phones??	Slick123	Nokia Hardware & Hardware Repair	44	10-01-2007 08:49
How To Repair A Dead Siemens Phone By Using Dreambox??	Eagle7	DreamBox	1	07-21-2006 15:58
GRiffin / GTS BOX How to repair a DEAD PHONE ?	mail_man	Griffin	4	03-25-2006 13:46

01-10-2010, 23:19	#2 (permalink)
chohansahib No Life Poster Join Date: Mar 2008 Location: Uk (Birmingham) Posts: 1,093 Member: 719944 Status: Offline Thanks Meter: 2,117	thanxxxxxx for info for new engineers .........

01-11-2010, 04:28	#3 (permalink)
chetanmaturkar7 No Life Poster Join Date: Mar 2009 Posts: 753 Member: 986394 Status: Offline Thanks Meter: 168	very very nice solution.keep it up............................................