global Laptop and motherboard repair tutorial | Page 85

Flamability rating: UL94-V0
Color: Usually red, tan, white, black or brown
Contact material: Copper alloy
Contact plating: Gold plated
Terminal plating: Tin plated video
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MATERIAL
Insulator: PBT / PA66
Flamability rating: UL94-V0
Color: Usually red, tan, white, black or brown
Contact material : Copper alloy
Contact plating: Gold plated
Terminal plating: Tin plated
Inductors perform a wide variety of essential functions in many electronic devices. Inductors are
used in power supplies as choke coils, for energy storage and to minimize noise and AC ripple.
Inductors are also used in transformers to change voltage level and to provide isolation. Chip
inductors are widely used as high frequency filters for eliminating radiation-noises from electronic
components like micro-electromechanical systems, integrated circuits, cellular phones, wireless
modems, and other types of wireless communication equipment. An inductor for use in a high
frequency filter is required to have a large inductance and a low resistance. Inductors generally
comprise a magnetic core composed of an iron or ferrite material that is wound with a conductive
coil. Consequently, inductors are often referred to as wire-wound coil devices. Inductance is
proportional to the square of the winding number of a coil and is inversely proportional to the length
of the coil. An inductor is divided into a wire wound type and a stacked type, each having different
application fields and fabrication methods.
Crystal oscillators
Crystal oscillators are used to generate precise, stable radio frequencies and are found in a wide
variety of electronic devices such as Computers (motherboard and monitor), Television,
Telecommunications systems (mobile phone), and more. The function is to keep the frequency of the
clock from drifting. If the signal from this clock stops producing frequency, or is weak, or the pulses
begin to vary or change, the electronic equipment might show intermittent problems or might stop
altogether.
REPAIRING A BURNED MOTHERBOARD AREA
Look at the burned circuit board and examine the size of the discolored area, which distinguishes
the burned portion of the circuit board. Determine the depth of the damage from the burn. The burned
portion of a circuit board will range in color anywhere from medium brown to black, and this
material should always be removed.