hOW TO AVIOD PROBLEMS IN MOBILE PHONES?

by barkkathulla 2012-09-20 16:58:50

6670/7610 SERVICING MANUAL


S.NO PLACE REASON
1 SWITCH ON PROBLEM ï TO CHECK THE D461 SD RAM IC
ï TO CHECK V CORE SUPPLY FROM SMPS
ï TO CHECK ON/OFF SWITCH
ï TO CHECK 26 MHZ CRYSTAL OSC
ï TO CHECK THE BATTERY
2 NETWORK ï TO CHECK VCOG 800
ï TO CHECK WHETHER 26 MHZ CRYSTAL FREQUENCYIS CONSTANT OR NOT
ï TO CHECK RF IC HAGER N5000 ,UEM ,CPU,ANTENNA(Z 800),RX,TXSWITCHES.
ï TO CHECK THE SOFTWARE
ï TO CHECK THE DEVICES ARE AFFECT IN WATER OR OTHER OILS
ï CHECK THE RX FILTER Z803
3 POWER FAILURE ï TO CHECK ON/OFF SWITCH
ï TO CHECK 26 MHZ CRYSTAL OSC
ï TO CHECK THE POWER ICUEM D250
ï TO CHECK RF HAGER N 500RF IC,D460âK87561 ET-D17B PLASS IC
4 BATTERY CHARGE ï TO CHECK THE CD 250 UEMCHARGING POWER IC,CHARGING TIP(IF FAULT CLEAN IT)
ï TO CHECK THE CONNECTION OF CHARGING FUSE F 130&L 130 COIL
ï TO CHANGE NEW CHARGER
ï TO CHECK CHARGING SOCKET,BATTERY CONNECTION
ï TO CHECK THE PROTECTOR DIODE V130 IN CHAREGR
5 CAMERA ï TO CHECH CAMERA MODULE,D370 SWITCH,X 420 CAMERA CONNECTOR
ï TO CHANGE THE CPU
ï TP LOAD THE SOFTWARE
ï TO CONTACT SOFTWARE ENGINEER
6 RING ï FAULT IN RINGER TIP
ï CHECK THE SPEAKER B 601,AUDIO IC N607S
ï TO CHECK THE SPEAKER IS 8 OHMS.
ï TO CHECK L 608,L 609,D 250,VIBRATOR PART .
7 HANGING ï TO CHECK 26 MHZ OSC,RF IC,UEM SWITCH,FLASH IC
ï TO LOAD THE SOFTWARE
ï TO CHANGE THE UEM
ï FINALLY AGAIN LOAD THE SOFTWARE.
8 LOW BATTERY AT CALLING TIME ï TO CHECK THE BATTERY,UEM,PA POWER AMPLIFIER
9 RADIO ï TO CHECK R451,D 440 USB IC,USB PRODUCTOR,USB IC,SYSTEM CONNECTOR X13.
10 BLUETOOTH COMMUNICATION ï TO CHECK D 370 UPP-CPU UPP WD2-V 3.2E
ï TO CHECK THE BLUE TOOTH IC D190
ï MAY BE SOFTWARE DAMAGE.
11 SUDDENLY DISPLAY INCONNECTING THE SIM ï TO CHECK UEM D250 POWERIC,SIM PRODUCTER R 310
ï TO CHECK THE SERIES OF R 311 AND R 312
ï TO CHECK THE SIM TRAY&SIM CARD
`12 MMC(MULTIMEDIA CARD) ï TO CHECK THE MMC*311 CONNECTION,CPU SWITCH,MMC CARD DRIVE IC N310,MMC CARD PRODUCTER R315.
13 NO CONTACTS IN MOBILE ï TO CHECK THE BACKUP BATTERY
659
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