Mobile Phone Repair Forum

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 ALCATEL/                08-Mar-2008 05:51    -  
 ERICSSON/               08-Mar-2008 05:54    -  
 LG/                     08-Mar-2008 05:54    -  
 MOTOROLA/               08-Mar-2008 05:52    -  
 NEC/                    08-Mar-2008 05:52    -  
 NOKIA/                  08-Mar-2008 05:54    -  
 PANASONIC/              08-Mar-2008 05:54    -  
 PHILIPS/                08-Mar-2008 05:54    -  
 SAGEM/                  08-Mar-2008 05:54    -  
 SAMSUNG/                08-Mar-2008 05:55    -  
 SENDO/                  08-Mar-2008 05:54    -  
 SHARP/                  08-Mar-2008 05:54    -  
 SIEMENS/                08-Mar-2008 05:56    -  
 SONY ERICSSON/          08-Mar-2008 05:57    -  
 SONY/                   08-Mar-2008 05:54    -

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use it with tornado or twister"

You can read more about that here: http://forum.gsmhosting.com/vbb/showthread.php?t=529220

Today on gsmhonting forum user: BB5box.org wrote post:

All who have one UFS or Twister box can FREE use it (unlock DCT4+ phones). No more need "advanced box". Very poor protection. Also, we still think if will make free full schematics and CPLD contents of this box

works or no, check and test Yourself: http://forum.gsmhosting.com/vbb/showthread.php?t=530170&highlight=advance+crack

It is good to say, that this update was relase by Advance Box Team only few hours before that post... And is was very nice update :)

Only 8 hours later, another user: Rod Strunk posted on forum topic: Unlock - BB5 BOX CRACKED - we did it in few minutes!!!!!!

but link for crack only for PM... At this moment topic is closed: http://forum.gsmhosting.com/vbb/showthread.php?t=530289

I dont know is there any reason that Advance, JAF and bb5 box has been cracked (or it is only fake crack) ... But we see, that there is small war between some producers. All what I know it that like always, only end users will lost by this stupid war...

Vibrator Problem

Vibrator Problem is same in all brands of sets here will discuss components which take part in creating vibrator problem in mobile phones firs of all we should know about key elements used in Vibra functions, these elements are as under

-Vibrator

-Tracks

-Micro controller IC

-Programming

Vibrator:

A vibrator is a little motor which is run by only 1.5 Volts DC or AC this motor has a shaft inside its coil the outer piece of the shaft is out of balance so when this motor runs it gives a little vibration

Checking Of Vibrator:

If you suspect that a vibrator is damaged you can check it as the following ways.

Check if its points ar not broken if it is so you can replace this vibrator on the basis of its shape and size because now a days all the vibrators are operate on same voltages but their shape and size is different.

Check continuity between the two terminals of Vibrator if there is no continuity then consider this vibrator damaged and replace it.

Tracks:

all tracks which lead to the vibrator from its micro controller are subject to create "no vibration problems" so if the tracks of the vibrator are damaged or open then vibrator will not get electronic pulses form its micro controller and it will not produce vibration. Our experiment says that 90% set with no vibration faults are fixed only with jumpering open tracks.. see an example below

Micro Controller IC:

A micro controller IC is used in a mobile phone to control pulses sent bye CPU so if a pulse sent by CPU to micro controller IC is not executed vibrator will not work despite of the integrity of tracks and vibrator its self so some times this problem occurs in mobile phone that vibrator is OK , Tracks are Ok but no vibration is there then you can check IC controlling this vibra function you see the picture given above where a 20PIN IC is connected to vibrator and if this IC fails to work properly then vibrator will not be able to work at all.

Programming:

there are such chances when an inner setting of the program running in a mobile phone compels or sets vibra off. you can check if the vibrator setting is correct in your mobile phone.

When we find a mobile phone with having problem of no vibration then we should take the steps given below to eliminate this problem.

Signal Problem

We are going to discuss here some techniques and steps to repair no signal condition in mobile phones irrespective of brands

hi dear students, sorry for missing last week because there was some problem in our webserver so I could not post new lesson for all of you therefore this is the time to begin again where we lost.

what is signal fault? and what are its kinds?

Signal faults:

signal fault in mobile phones create problem with making connection to our mobile phone tower when we feel that the signal stregnth bars are absent in our mobile phone screen then we can say that our phone has no signal. if signals in mobile phones are absent we cant make a call because there is no connection between our network and our phone that time.

Kinds of Signal fault:

there are many kinds of singal fault but we are discussing here some most common signal faults in mobile phones.

-No signal

-Low signal

-Signal come and then disappear

-signal full or satisfactory but voice cracking

No signal:

dear students now we are going to discuss here some important causes of no signal. if you find a handset with no signal inside it you can consider these components likely to be damaged.

-Antenna

-Antenna pad

-Antenna switch

-antenna tracks

-Rx filters

-Rf Power Amlifier

or tracks

-Rf signal processor (called hagar IC in nokia)

Some time you can experience that signal fault is due to damaged antenna, so you need to replace this antenna specially in sonyericson the antenna is sticker type and it can be easily damaged so you consider first antenna in mobile phone signal faults.

Antenna pad is often rusted with corbon so you can wash it with cleaner like CTC (corbon tatra cloride) this place is often responsible for low signal faults.\

!Antenna switch is the component which is most common in mobile phone signal faults you can locate this component on the top of the mother board it is in steel case often. purpose of this component is to switch between two or some time three type of frequency bands which are (GSM 900MHz , EGSM 1800MHz, PCS 1900MHz ) you may know that there are two types of waves used in our radio section one is TX (wich is transmitted to oythers) second is RX( wich we recieve from others)

antenna swith connects GSM Rx and GSM Tx with antenna pin when it found in GSM based network and in the contrary situation it contacts DCS Rx and DCS Tx pin with antenna pin so may both signal can be communicated.

Antenna tracks are the other reason to no signal so if the contacts between antenna and antenna switch are broken there would be no signal at all.

RX Filters are used to filter incomming radio waves so may no hormonics and other frequencies could get into signal processing only targetted frequency can be enter into the specific place, so some times our RX filters filter frequency we needed as well as other frequencies you can say that they block our targetted frequency so we can replace these filters to get it repaired. this is not in common cases but we found many faults like this in nokia 8210 no signal problem.

the basic thing about radio frequency Power Amplifire is that when we need strong radio waves to spread far around then we have to use some type of amplifire wich wil be able to amlify radio waves in a good power so our mobile phone uses PA(Rf power amplifire) it is used to communicate betweent long distances lik 15-to-20 kilometers so if our PA is damaged it can not comunicate and get response from the base stations.

If the supply of PA is disconnected it cannot work so signal faults can occure so you should check PA +supply carefully.

the main head of the radio department in mobile phone is Rf signal processor which is often used to create, measure, calibrate and manage radio waves so if there is a problem in this signal processor you can say that there will be no signal at all, in some sets you can check they cannot be turned on without radio IC( rf signal processor) like in all nokia mobile phone you cannot power on a set without radio IC except special circumstances.

dear students you have to wait for complete signal faults repairing process which we will discuss in the next lesson

This very first lesson is intended to make you learn about basics of cell phones

hi dear students,

in the first place of your course i would like to introduce you about cell phone basics and the very basic techniques with the cell phone works.

while beginning to the main technology of cell phones you should know about the basic sections of a mobile phone. A conventional mobile phone contains three main sections prescribed as under.

Radio Section
Power section
computer section

Radio section

A radio section is based on two main Circuits.

Transmitter
Reciever

A simple mobile phone uses these two circuits to correspond to an other mobile phone. A Transmitter is a circuit or device which is used to transmit radio signals in the air.and a reciever is simply like radios which are used to recieve transmissions(Radiation) which is spread in the air by any transmitter on a specific frequency.

The two way communication is made possible by setting two transmitters and two recievers sycronized in this form that a trasmitter in a cell phone is syncronised with the frequency of other cell phone's recieving frequency same like the transmitter of second cell phone is syncronised with the recieving frequency of first cell phone. So first cell phone transmits its radiation in the air while the other phone listens it and same process is present in the opposit side. so these hand held two cell phones correspond to one another.

the technology used in these days is a little bit different but it is based on the basic theory prescribed before. the today's technology will be discussed in later on.

Power Section

A power section in mobile phones is designed to handle energy matters that is cosumed in mobile phones.There are two main sub sections in a single power section.

Power Distribution and switching section
Charging Section

A power distribution section is designed to distribute electricity to the other sections of a phone. this section takes power from a battery (which is figured commonly 3.6 Volts)and in some places it is steped down to various volts like 2.8 V 1.8V 1.6V etc.while on other place it also steps up the voltage like 4.8 V. this section is commonly designed around a power IC(and integrated circuit) which is used to distribut and regulate the voltage used in other components.

The Charging section is based on a charging IC which takes power from an external source and gives it to battery to make it again power up when it is exausted.this section uses conventiolly 6.4 V from an external battery charger and regulates it to 5.8V wile giving it to battery. The battery is made charged by this process and it is ready to use for the next session(a battery session is a time which is provided by the maufactrur of a cell phone for standy by condition of a mobile phone or talk condition.)

Computer Section

a computer section is used in mobile phones to handle decision making applications like making decision the phone should be power on when its power switch is pressed down one time and on the other time the phone should be powered off. this section is commonly based on around three main components

RAM( Random Access Memory)
ROM,Flash(Read Only Memory
CPU( Centeral Processing Unit)

The very first part is a memory component which commonly saves in it self user defined setting of a phone and contacts Numbers. the informations in this memory chip is editable by user easily

The second Component contains mobile phone's operating system which is not editable bye user but it is only in special conditions

The Third Compnent is as like a simple brain used to understand differnet situations ad to make decisions and to hold control on other components as well as sections

Note: The special terms used in this lesson should be asked for if not understood able

Ringer Problem

Ringer Problem is also same in all brands of handsets, here we will discuss components which take part in creating Ringer problem in mobile phones. first of all we should know about key elements used in making in mobile phones. these components are listed below.

-Ringer

-Tracks

-Ringer Controller IC

-Programming

Ringer:

A ringer is commonly taken as a speaker, in the former sets we found ringers like two metal plates joined together. one plate was small and the other was large and there was a crystal material between the two plates so there was a capacitance effect between the two plates. and when the supply was connected to the ringer given below it would give a sound like "Click" but if it was connected with AC supply it would give voice like "Shar r r r r r r r r r r r !" and so on.

In the old ringer models there was an oscillator used to make different voice frequencies in ringer . so they made it to produce different tunes procured by CPU and its memory and voice oscillator.

These days most of the ringers are behaving like an ear piece used in mobile phones. it would be right to say that now a days ringer and speakers are merged in the same shape altogether and instead of using an other piece working as ringer the Companies use a speaker which is working as speaker as well as ringer. please read below carefully.

1. most of the old nokia , samsung and motorola phones were built with a ringer and speaker

2. Now a days nokia , samsung and motorola are using speakers as earpiece and ringer purposes .because the speakers are used to make a ring

3. Sony Ericson use mostly a piece in which there are four points two for ringer and two for ear piece because they have made both things in joined form.

4. another difference is that in all the mono ringtones hand sets there was a separate ringer and a separate speaker used.

Checking Of Ringer:

If you suspect that a Ringer is damaged you can check it as the following ways.

-Check if its points ar not broken if it is so you can replace this Ringer on the basis of its shape and size because now a days all the vibrators are operate on same voltages but their shape and size is different.

-Check continuity between the two terminals of Ringer if there is no continuity then consider this vibrator damaged and replace it. (because now days speakers are used as ringer and ear piece altogether and speakers have full continuity between the two terminals).

Tracks:

In the ringer problem there may be certain chances that the tracks may be broken and if it is so then trace the tracks leading towards the ringer's two points. mostly the one part of ringer is joined with "+" supply and they second track is joined to one of the pins of its controller IC.

See the example below in which the ringer's lower point is joined with "+" and the second point is joined with PIN# 6 of "UI" IC(which controls ringer , vibrator and lights) this example is given from the circuit diagram of famous nokia handset 3310.

Ringer Controller IC:

A IC who controls the ring signals in mobile phones is normally called ringer IC and it control ringer activity. in some cases it is damaged and it would be fixed up with a new IC replacement.

Programming:

there are such chances when an inner setting of the program running in a mobile phone compels or sets Ringer off. you can check if the Ringer setting is correct in your mobile phone.

When we find a mobile phone with having problem of no Ringer then we should take the steps given below to eliminate this problem.

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Vibrator Problem

Signal Problem

very first lesson is intended to make you learn about basics of cell phones

Ringer Problem

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