Sunday 28 August 2011
NOKIA BB5, BB5+ EMI / ESD FILTER IC’S CONFIGURATION AND MODIFICATION WITH TROUBLESHOOTING PROCEDURES AND TRICKS..
08:17 | 
Posted by
Mehmood Riaz |
NOKIA BB5, BB5+ EMI / ESD FILTER IC’S CONFIGURATION AND MODIFICATION WITH TROUBLESHOOTING PROCEDURES AND TRICKS..
Q: What is a crystal IC?
A: A Crystal IC is a small chips designed by Engineers to protect mobile phone devices, so that it cannot be damage by these this two harmful thing in Electronic circuits especially mobile phones..
I'm talking about these two elements here>>
Here's what I'm talking about....
Electromagnetic interference (or EMI, also called radio frequency interference or RFI) is a disturbance that affects an electrical circuit due to either electromagnetic conduction or electromagnetic radiation emitted from an external source. [1] The disturbance may interrupt, obstruct, or otherwise degrade or limit the effective performance of the circuit. The source may be any object, artificial or natural, that carries rapidly changing electrical currents, such as an electrical circuit, the Sun or the Northern Lights.
EMI can be intentionally used for radio jamming, as in some forms of electronic warfare, or can occur unintentionally, as a result of spurious emissions for example through intermodulation products, and the like. It frequently affects the reception of AM radio in urban areas. It can also affect cell phone, FM radio and television reception, although to a lesser extent.
Electrostatic discharge (ESD) is the sudden and momentary electric current that flows between two objects at different electrical potentials caused by direct contact or induced by an electrostatic field. [1] The term is usually used in the electronics and other industries to describe momentary unwanted currents that may cause damage to electronic equipment.
ESD is a serious issue in solid state electronics, such as integrated circuits. Integrated circuits are made from semiconductor materials such as silicon and insulating materials such as silicon dioxide. Either of these materials can suffer permanent damage when subjected to high voltages, as a result there are now a number of antistatic devices that help prevent static build up. (quote in wikipidia)
Here's an Example picture of this tiny Chips...
this tiny chips were most commonly damaged in terms of...
a. display problems
b. keypad problems
c. microphone / audio problem
d. sim-card problem
e. memory card problem
advisory some languges used in the images were Tagalog (Philippines Language)
be advice just use google translator if something
Now here's where it is being used in Nokia circuit...
Q: What is a crystal IC?
A: A Crystal IC is a small chips designed by Engineers to protect mobile phone devices, so that it cannot be damage by these this two harmful thing in Electronic circuits especially mobile phones..
I'm talking about these two elements here>>
Here's what I'm talking about....
Electromagnetic interference (or EMI, also called radio frequency interference or RFI) is a disturbance that affects an electrical circuit due to either electromagnetic conduction or electromagnetic radiation emitted from an external source. [1] The disturbance may interrupt, obstruct, or otherwise degrade or limit the effective performance of the circuit. The source may be any object, artificial or natural, that carries rapidly changing electrical currents, such as an electrical circuit, the Sun or the Northern Lights.
EMI can be intentionally used for radio jamming, as in some forms of electronic warfare, or can occur unintentionally, as a result of spurious emissions for example through intermodulation products, and the like. It frequently affects the reception of AM radio in urban areas. It can also affect cell phone, FM radio and television reception, although to a lesser extent.
Electrostatic discharge (ESD) is the sudden and momentary electric current that flows between two objects at different electrical potentials caused by direct contact or induced by an electrostatic field. [1] The term is usually used in the electronics and other industries to describe momentary unwanted currents that may cause damage to electronic equipment.
ESD is a serious issue in solid state electronics, such as integrated circuits. Integrated circuits are made from semiconductor materials such as silicon and insulating materials such as silicon dioxide. Either of these materials can suffer permanent damage when subjected to high voltages, as a result there are now a number of antistatic devices that help prevent static build up. (quote in wikipidia)
Here's an Example picture of this tiny Chips...
this tiny chips were most commonly damaged in terms of...
a. display problems
b. keypad problems
c. microphone / audio problem
d. sim-card problem
e. memory card problem
advisory some languges used in the images were Tagalog (Philippines Language)
be advice just use google translator if something 
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