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notes made from professor messer online youtube series. these are for latest version of Comptia A+ cert
Terms in this set (71)
Lap Top Battery Types
Lithium Ion or Lithium Ion Polymer: No memory effect and charging the battery diminishes capacity
Most Used component of laptop
Laptop keyboard
Laptop Key Placement
Can be delicate procedure, easily damaged, check with manufactures instructions
SO-DIMM
Small Outline Dual In-Line Memory Module
Laptop Memory
Memory used in laptops and mobile devices often easy to install and replace unless soldered to the system board.
Laptop Memory soldered to system board
no upgrade available, requires full system board replacement
Magnetic Disk
Laptop storage space with traditional spinning drive platters. 2.5 form factors (3.5 inch for desktops
SSD (solid state drive)
-All memory, no moving parts
-Silent, fast access time, less latency
-Better performance
M.2 interface
smaller form factor, No SATA data or power cables, easy to install
Replacing laptop storage
open cover on back, open entire laptop, can be modular,
M.2 Interface replacement
one screw, similar to RAM
Migrating from HDD to SSD
Move from Spinning mechanical drive to solid state
like getting new laptop
Installing an OS on SSD
migrating from HDD to SSD
- move user documents between drives
- install can be applications
- can be time consuming
Image/Clone HDD
migrating from HDD to SSD
- no OS installation required
- moves everything from one to the other
Image/ Clone HDD requirements
Imaging
software needed, sometimes included with the SSD, many commercial and open source options
- create Image file
- drive to drive image
802.11 Wireless and Blutooth
Wireless Network connectivity
802.11
- local area network (LAN)
- High Speed
- Internet access
Bluetooth
- Personal Area Network (PAN)
- short range
- Connect Peripherals and other nearby devices
Mini PCIe (express) types
Wireless or wireless personal
Biometrics
the identification of a user based on a physical characteristic, such as a fingerprint, iris, face, voice, or handwriting
Biometric Components
-Software or OS
-also hardware for most options
NFC (near- field Communication)
A short-range wireless communication technology that allows two devices to exchange data by touching or being in very close proximity.
- Common on mobile phones or watches
LCD (liquid crystal display)
technology produces an image by filtering light through a layer of liquid crystal cells
LCD Advantages
lightweight, relatively low power, relatively inexpensive
LCD disadvantages
Black levels are a challenge
Requires separate backlight
Lights difficult to
replace
TN LCD (Twisted Nematic)
+ Fast response times (gaming!)
+ Low power draw
- Poor viewing angles - color shifts
IPS LCD (in-plane switching liquid crystal display)
excellent color representation
More expensive than TN LCD
VA LCD (Vertical Alignment)
- good compromise between TN and IPS LCD
- good color Representation
- Slower response than TN
OLED (organic light-emitting diode)
Display technology where an organic compound provides the light for the screen, thus eliminating the need for a backlight or inverter.
OLED advantages
Thinner and lighter
screens
flexible and mobile
no backlight
tablets, phones, smart watches
Wi-Fi antennas
Wifi main and Aux, Bluetooth
WiFi antennas characteristics
- wires wrap around laptop screen
- Primary connection
- follow same path as previous wires when replacing
Webcam
A video camera for computers typically used to provide real-time video footage
Microphone
- usually built into laptop display
- not good for non-casual use
- analog or USB microphones can help
Cold Cathode Fluorescent Lamp (CCFL)
An older backlighting technology that uses one or two fluorescent
tubes to light a monitor panel.
- older, less common, higher voltage, Thicker
LED - Backlit LCD display
-Backlight is LEDs instead of florescent.
-LEDs around the edge of the screen.
-An array of LEDs behind the screen.
-The latest laptops are LED-backlit.
Additional Components behind LCD
- Inverters - turn DC power
to AC power
- Backlight
- florescent lamp/LED
Reason we use Inverters
CCFL backlights require AC power but backlight your laptop is using uses DC power.
Determining backlight failure
- shine flashlight at screen, if information visible problem may not be with backlight
- CCFL problem then just replace inverter
-other
problem - replace display
Digitizer
Hybrid device using keyboard and tablet like display
Digitizer characteristics
- can use pen like (stylus) device for input
- High graphic and drawing resolution inputs
Touchscreen digitizer
takes input from finger and convert to digital form. Can use keyboard, stylus or key presses all on same system.
Connecting Mobile devices
Wired and Wireless
USB (Universal Serial Bus)
-Primary wired Connection type
- used for high speed communication
- Used for charging and data transfers
Micro-USB
A smaller version of the regular USB connector. The "B" version is commonly used for tablets, Android cell phones, and other small electronic devices.
Mini-USB
A smaller version of the regular USB connector; it is also smaller than microUSB.
USB-C
-The newest, and most versatile, type of USB
connector.
-24-pin double sided USB Connector (used for both hosts and devices)
USB-C Can transmit
-display port
- HDMI
- Thunderbolt
Lightning Connection
- 8 pin digital signal used by Apple devices
Lightning Connector advantages
-
High power output for phones and tablets
- can be inserted either way
- simple design
DB-9 Interface
-9 pin connection
- also called DE-9
- commonly used for RS-232 signals
RS-232
The recommended standard (RS) upon which all serial communication takes place on a PC.
DB-9 connector
A type of connector with nine pins that's commonly used in serial communication that conforms to the RS-232 standard.
NFC (Near Field Communication)
Mobile technology that enables short-range wireless communication between mobile devices. Now used for mobile payment technology such as Apple Pay and Google Wallet
Other ways to use NFC
Access device or token as identification card to hold up to a door
Bluetooth
Wireless PAN technology that transmits signals over short distances between cell phones, computers, and other devices
Hotspot
- your own personal wireless router
-extend the cellular data network
to all of your devices
- depends on phone type and provider
- may require additional charges and data cost
Different types of Touchpens
-Touch pen Stylus
- capacitive stylus
- Digital Stylus
stylus
allows you to activate interface without touching screen
used for handwriting, notetaking, signatures, and easier to
see screen and perform precise functions
Active Stylus / Digital Stylus
Provides more precise usability than capacitive touch pen. includes pressure sensitivity. Must be compatible with tablet or device group. (ie. apple device needs apple stylus)
Drawing Pad
Use an active stylus with external digitizer. best for when using pc without any type of capacitive display or active touch screen to interact with.
Reason to use Drawing pad
get same precise input as active stylus
Trackpad
A touch-sensitive surface on which you slide your fingers to move the on-screen pointer
can be external using batteries or bluetooth and functions can be
customized
Enable and disable trackpad
some laptops have function key to enable and disable track pad to avoid mistake inputs or clicks
Headsets
• Hands-free audio - Earphones and microphone
• Wired
• Connects to 3.5mm TRRS connector (Tip-Ring-Ring-Sleeve)
• Wireless - Bluetooth headsets
Apple User Headsets
May use lightning port or bluetooth
Speakers
An output device that allows you to hear voice, music, and other sounds from your computer.
Can be battery powered, wired, or wireless using bluetooth
Camera/webcam
Can be internal or external. external on
desktops and internal on laptops
accessible from multimedia application, photo utilities, and video conferencing
- real time communication
docking station
An external device that attaches to a mobile computer or device and contains a power connection and provides connections to peripheral devices.
Reasons to use a docking station
-
use external keyboard and mouse
- extend existing laptop interfaces
- avoid cable issues
- add additional functionality
- Desktop adapter cards
Port Replicator
A device used with a laptop. The port replicator remains on the desktop with external devices connected to ports on it. A laptop then needs only one connection to the port replicator to have access to the peripherals. (6)
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