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Various AEG, Bosch/Dancall, Toshiba, Vitel, Maxon, Sendo .... and any other Phone which can't find any serving section for it......

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Old 22-08-10, 11:59 PM   #1
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Default Mobile Repairing Training

Mobile Repairing Training

Introduction To Mobile Phone Parts.






Dear
friends here we will discuss about what kind of functions a typical
mobile has so let us start our new lesson. while starting i would
like to say all of you that you please keep in touch with me by our
contact us page and please don't feel any hesitation to ask me any
question if you have about these lessons. these lessons will make you
learn good repairing skills so keep reading these lectures.
First of all we will discuss how many main functions a mobile often has irrespectively of mobile brands.
There are three major sections inside a mobile

Power Section
Radio Section
Computer Section
Power Section:
A
power section deals with power related tasks such as power distribution
or charging the battery so this section can be divided into two sub
sections like.
Power Distribution
A power distribution section
is built around an "power IC" it takes 3.6V power from battery and
regulates its power and then distributes to the other components used
in mobile circuit. in some mobile s tech "RF Power
amplifier" uses more Power than provided bye mobile 's battery
.i.e. 4.7 V or 5.6 V in some s. the power Ic with a power boaster
coil is used to increase voltages. so we can say that power IC is used
to provide power to other components how much they needed. either less
than battery voltage or more than it.
Charging Section
A charging
section works for battery charging purposes.it is often consists a
fuse, a coil, a protecting diode, a filter capacitor and charging IC
and some other discreet. the charging section helps battery to be
charged when it needs and when battery is charged, charging IC reads
its state of charge and feels it full charged and then disconnects
charging from it.
Radio Section:
A radio section has basically a set of four main functions.wich are.
Band Switching
RF Power Amplification
Transmitter
Receiver
Band Switching:
In the modern mobile communication techniques. the frequency of mobile communication is divided into three bands
GSM (operates on 900 MHz)
DCS (operates on 1800 MHz)
PCS (operates on 1900 MHz)
the
third band is used only in USA whereas the first two bands are used in
the rest of the world. band switching is done bye a "ceramic antenna
switch" it reads from the radiation dispersed in the air and then
switches to the appropriate band.
in the very first phase of mobile
s there were single band handsets which operated on single
frequency band but now a days all the handsets are dual band or tri
band in operation.
RF Power Amplifier
RF power amplifier is
often called as ".PA" or"Transmitter" its functions is to amplify or
boast the power which is being transmitted to air, so may it would be
able to communicate with long distances. a typical .PA can amplify rf
power up to 0.6W or 600mW. This amount of rf power is sufficient to
communicate nearly 20 to 25 kilometers in open area, but all the PA's
are controlled by there rf signal processor, so if we are near our cell
base tower the PA of our will transmit low power but if we are
far away it will produce its maximum power.
Transmitting
A mobile
's rf section is basically built around an rf IC which is often
called rf signal processor whereas in nokia it is called hagar IC in
some hand sets and in some hand sets it is called Mjoelner.
irrespectively of the brands and verity of names we call it rf signal
processor. this IC works as transmitter and receiver as well. working
as transmitter it takes instructions from 's computer and also
takes audio data from audio section and creates radio waves then mixes
audio data to its radio waves according to the instructions given by
computer section. this mixer of audio and radio is sent to PA to
amplify its strength
Reciever
A reciver section for rf waves is
built in rf IC, as it is said that this IC works for dual purposes
first transmitting and section recieving. in the recieving section of
mobile s a radio signal is gather from ceramic antenna switch and
then it is filtered and sent to rf IC to further process. in rf IC
signal is detected and then rectified for audio and data which is sent
to audio IC or computer section.
Computer Section:
A computer section in mobile consists of two main functions
CPU(central processing unit)
Memory (RAM, FLASH, COMBO CHIP)
CPU:
A
CPU is used in mobile s as a central processing arithematic or
controler. the cpu controls various functions in mobile s like
signal, display, sound converting(DSP), charging, power on, rf channel
controler, rf tx power conroller, LEDs, vibrator, data processing, data
storing etc. so we can say that if a cpu is damaged in any mobile
it cannot be repaired unless the CPU is not replaced but this type of
fault is not even seen to me ever either memory chips can be damaged.
in brand Nokia CPU is named with two different words (MAD or UPP)
Memory:
there are two main types of memories used in mobile s
RAM (Random Access Memory)
The
RAM is used in mobile s to store user data in mobile s. So
these a days we can store pictures, messages, ringtones, applications,
themes and other these type of things in mobile s so CPU stores
these types of data in the RAM of our mobile s.
Flash (eeprom, ROM etc)
The
flash chip is used in mobile s to hold mobile 's operating
system in it. so if the flash chip is damaged in mobile s the
cannot power on properly because all the instructions to start a
mobile s and its various tasks like call making , display etc are
stored in the flash chip of mobile s.
Combo Chip
In smoe
mobile s there is a combined type of memory used which is called
combo memory chips these types of memories work for both like RAM and
Flash.The clear example of this type of memory is used in Nokia 1100.
Note: Multy Media Cards are not a part of mobile s becaues they are used externally.

Mobile Phone Function


Dear
friends here we will discuss about what kind of functions a typical
mobile has so let us start our new lesson. while starting i would
like to say all of you that you please keep in touch with me by our
contact us page and please don't feel any hesitation to ask me any
question if you have about these lessons. these lessons will make you
learn good repairing skills so keep reading these lectures.

First of all we will discuss how many main functions a mobile often has irrespectively of mobile brands.
There are three major sections inside a mobile


Power Section
Radio Section
Computer Section
Power Section:
A
power section deals with power related tasks such as power distribution
or charging the battery so this section can be divided into two sub
sections like.
Power Distribution
A power distribution section
is built around an "power IC" it takes 3.6V power from battery and
regulates its power and then distributes to the other components used
in mobile circuit. in some mobile s tech "RF Power
amplifier" uses more Power than provided bye mobile 's battery
.i.e. 4.7 V or 5.6 V in some s. the power Ic with a power boaster
coil is used to increase voltages. so we can say that power IC is used
to provide power to other components how much they needed. either less
than battery voltage or more than it.
Charging Section
A charging
section works for battery charging purposes.it is often consists a
fuse, a coil, a protecting diode, a filter capacitor and charging IC
and some other discreet. the charging section helps battery to be
charged when it needs and when battery is charged, charging IC reads
its state of charge and feels it full charged and then disconnects
charging from it.

Radio Section:
A radio section has basically a set of four main functions.wich are.
Band Switching
RF Power Amplification
Transmitter
Receiver
Band Switching:
In the modern mobile communication techniques. the frequency of mobile communication is divided into three bands
GSM (operates on 900 MHz)
DCS (operates on 1800 MHz)
PCS (operates on 1900 MHz)
the
third band is used only in USA whereas the first two bands are used in
the rest of the world. band switching is done bye a "ceramic antenna
switch" it reads from the radiation dispersed in the air and then
switches to the appropriate band.
in the very first phase of mobile
s there were single band handsets which operated on single
frequency band but now a days all the handsets are dual band or tri
band in operation.
RF Power Amplifier
RF power amplifier is
often called as ".PA" or"Transmitter" its functions is to amplify or
boast the power which is being transmitted to air, so may it would be
able to communicate with long distances. a typical .PA can amplify rf
power up to 0.6W or 600mW. This amount of rf power is sufficient to
communicate nearly 20 to 25 kilometers in open area, but all the PA's
are controlled by there rf signal processor, so if we are near our cell
base tower the PA of our will transmit low power but if we are
far away it will produce its maximum power.
Transmitting
A mobile
's rf section is basically built around an rf IC which is often
called rf signal processor whereas in nokia it is called hagar IC in
some hand sets and in some hand sets it is called Mjoelner.
irrespectively of the brands and verity of names we call it rf signal
processor. this IC works as transmitter and receiver as well. working
as transmitter it takes instructions from 's computer and also
takes audio data from audio section and creates radio waves then mixes
audio data to its radio waves according to the instructions given by
computer section. this mixer of audio and radio is sent to PA to
amplify its strength
Reciever
A reciver section for rf waves is
built in rf IC, as it is said that this IC works for dual purposes
first transmitting and section recieving. in the recieving section of
mobile s a radio signal is gather from ceramic antenna switch and
then it is filtered and sent to rf IC to further process. in rf IC
signal is detected and then rectified for audio and data which is sent
to audio IC or computer section.
Computer Section:
A computer section in mobile consists of two main functions
CPU(central processing unit)
Memory (RAM, FLASH, COMBO CHIP)
CPU:
A
CPU is used in mobile s as a central processing arithematic or
controler. the cpu controls various functions in mobile s like
signal, display, sound converting(DSP), charging, power on, rf channel
controler, rf tx power conroller, LEDs, vibrator, data processing, data
storing etc. so we can say that if a cpu is damaged in any mobile
it cannot be repaired unless the CPU is not replaced but this type of
fault is not even seen to me ever either memory chips can be damaged.
in brand Nokia CPU is named with two different words (MAD or UPP)
Memory:
there are two main types of memories used in mobile s
RAM (Random Access Memory)
The
RAM is used in mobile s to store user data in mobile s. So
these a days we can store pictures, messages, ringtones, applications,
themes and other these type of things in mobile s so CPU stores
these types of data in the RAM of our mobile s.
Flash (eeprom, ROM etc)
The
flash chip is used in mobile s to hold mobile 's operating
system in it. so if the flash chip is damaged in mobile s the
cannot power on properly because all the instructions to start a
mobile s and its various tasks like call making , display etc are
stored in the flash chip of mobile s.
Combo Chip
In smoe
mobile s there is a combined type of memory used which is called
combo memory chips these types of memories work for both like RAM and
Flash.The clear example of this type of memory is used in Nokia 1100.
Note: Multy Media Cards are not a part of mobile s because they are used externally.


Mother Board System

This
Lesson is intended to make you aware of the Fundamentals of a mobile
's mother board and I want to teach you about what a typical
mother board.

A typical mother board is constructed using two main things
Fiber Plate
Copper Plate
These two plates are joined in three forms.
Single layer board
Double layer board
Three or tripple layer board
A
single layer board is constructed yusing one copper plate and the other
fiber plate. Its one side is copper faced and other is fiber faced.
while
a Double layer board is made with two copper sheets ad fiber sheet.Its
one side is copper faced and the other is also copper faced and the
fiber is stcked between two copper sheets.this kind of board holds
electronic components on both of its side because both copper sided
prints anre inter connected with one another on proper places
A three layer board is made with three copper sheets and two fiber sheet.as it is shown below.
Basics about Mother Boards
Different
mother boards have different views but many things are common in
different brand mother boards.first common thing is ,every mother board
has radio Section on top of the mother board
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Old 23-05-11, 10:18 PM   #2
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Default Re: Mobile Repairing Training

Sir I want a certificate in Mobiles Phone Repairs Please. Can you help me to get this.
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Old 01-02-13, 12:14 PM   #3
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Default Re: Mobile Repairing Training

my nokia n85 is not getting switched on it only shows nokia then automatically gets switched off can u plz help me out
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Old 01-02-13, 12:45 PM   #4
Shuvo007
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Default Re: Mobile Repairing Training

Quote:
Originally Posted by srafiq View Post
my nokia n85 is not getting switched on it only shows nokia then automatically gets switched off can u plz help me out

Full flash your set with update firmware.
===================================

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