Common Fault in Mobile Phone

Common Faults in Mobile Phone


A typical mobile phone has various types of faults which can be distributed
in two main kinds of faults

-Hardware faults
-Software faults
-Setting faults

Hardware Faults:

Hardware fualt in mobile phones are related to mother boards of Mobile phone, batteies
and any physical fault will be amount to hardware faults.

The list of commune hardware faults is given below.

- Dead set condition
- No charging
- Battery empty
- Auto charging
- Low signal
- No signal
- Voice problem
- Vibrator problem
- Ringer problem
- Backlight problem
- Auto turn off/on
- Hanging problem
- Insert simcard (no simcard insterted shows on the screen)
- Keypad problem
- Display problem
- Phone drop in to water
- Radio not work
- Memory card blog problem
Software Problem:
- Hanging problem
- No signal
- Dead set
- Display
- Contact service (Contact retailer, Contact service provider)
- Test mode
- Not charging
Setting Problem:
- Call divert
- Sim lock
- Security code
- Country code
- Configuration of SMS
- Configuration of GPRS
- Configuration of call

Mobile Network Solution

Mobile Network Problem and Solution

There is two sections in network
1.Rx Section
2.Tx Section
all technicians need to use manual searching in mobile phone, Testing for Rx section
and Tx Section.

How to find which section is fault Tx or Rx?
Testing Rx section
use manual search for testing Rx section, after searching Rx section good condition
means it shows network list like Airtel, hutch,(or)any other network list in your area,

If Rx section bad condition after searching it shows No Network Found.

1,after searching it shows network list means Rx section is Ok.
2,after searching it shows No Network Found means Rx Section is fault.

Testing Tx Section

Use manual search for testing Tx section, after searching it shows network list,
then you can choose your simcard network, if Tx section is good condition it shows
HOME NETWORK SELECTED, if Tx section is fault it shows NO ACCESS.

1,after selecting network it shows HOME NETWORK SELECTED means Tx section
is Ok.
2,after selected network it show NO ACCESS means Tx section is Fualt.

Information of Rx section components and Ics Nokia dct-3 Tech
1,Antenna switch
2,RF IC (Hagar IC)
3.Audio IC (Cobba IC)
4.Crystal Oscillator
5,Filters
6,VCO (Voltage Control Oscillator)

1,PF IC (PA IC)

Information of Rx section components and ICs Nokia Dct-4 Tech
1,Antenna Switch
2,Filters
3,RF IC
4,Crystal Oscillator
5,VCO (Voltage Control Oscillator)
6,UEM IC
How to Service Rx Section Fault?
Solution for Rx section no Network found fault Nokia Dct-3 Technology

1,Clean the PCB well and Rehot (If not ok follw one by one solutions)
2,Give antenna switch jumper
3,Rehot the RF IC
4,Rehot the Audio IC
5,Reball the RF IC
6,Change the Audio IC
7.Change the Audio IC
8,Change the Crystal Oscillator for Rx section NO NETWORK FOUND fault
Nokia Dct-4 Technology

For Nokia Dct-4
1,Clean the PCB well and Rehot (If not ok follw one by one solutions)
2,Give antenna switch jumper
3,Reheat the RF IC
4,Change the Crystal Oscillator
5,Reball the RF IC
6,Change the RF IC
7.Change Filters

How to Service Tx Section Fault?

Solution for Tx section NO ACCESS fault Nokia Dct-3 Technology
1,Change the PF IC Solution for Tx section No Access Fault
Nokia Dct-4Technology
2,Change the PF IC Solution for other Network Fualt
Solution for low network coverage, all models
1,Give jumper from antena contact to cabinet antenna
2,Change the antenna switch solution for Dct-3 technology
When switch on the mobile it shows full networks after few seconds it goas down
1,Flash-Rebuild Imei,-UI setting (If not Ok follow 2nd solution)
2,Check the track from battery + ve point to PA IC,if track is ok then change
the good PF IC. Solution for Dct-4 Technology when switch on the mobile it shows
full network after few seconds its goas down.
1,Write good PM file (If not ok follow 2nd Solution)
2,Change the PF IC, if still the problem same check the PF power track to
battery + ve point.