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1: Identifying, Adding, and Removing System Components
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Portable System Components
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Because portable systems are largely proprietary, components cannot be mixed among them Most portables must be returned to the manufacturer to be repaired or upgraded This section introduces you to some laptop-specific components and describes installation procedures, where applicable Portable computers are much more difficult and costly to repair than desktop PCs To make matters worse, they are also much more likely to need repairs Because portable are portable, it s easy to drop them, bang them into things, and so on, all of which can cause damage Always use a proper carrying case or bag for your portable to avoid the lengthy and costly process of having it repaired
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The AC adapter s function is to convert AC power to DC power, in the same way that the power supply does in a desktop The AC adapter is also responsible for recharging the battery If an external adapter must be replaced, simply unplug it and attach a new one Because laptops have proprietary designs, check with the manufacturer for instructions on replacing an internal adapter Furthermore, since AC adapters have varying output voltages, never use an AC adapter with any laptop other than the one for which it was made
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Laptop hard drives vary in physical size and interface and are typically either 25-inch Ultra Direct Memory Access (UDMA) or 25-inch Enhanced Integrated Drive Electronics (EIDE) Replace a hard drive only with another of the same type from the same manufacturer Usually, you can remove a small plastic cover on the bottom of the laptop to access the hard drive Slide the drive out (see Figure 1-10), then replace it with a new drive and replace the cover There are also hard drives that can be installed into the PC Card expansion bays
Keyboard
Most laptops come with small, integrated keyboards Some laptop keyboards include a pointing device such as a pointing stick or touch pad Unfortunately, because keyboards are integrated into laptops, they are not easily replaced, and the entire computer must usually be sent back to the manufacturer when there is a problem
Processor Board
The laptop version of a system board is called a processor board It typically contains both the processor and RAM and in most cases can be repaired or upgraded only by the manufacturer
Video Board
A portable computer s video output is controlled by a video board, in much the same way that a PC s video is controlled by a video expansion card Video boards are typically
FIGURE 1-10
Removing a hard drive from a portable system
1: Identifying, Adding, and Removing System Components
integrated with the system and are difficult to upgrade In most cases, a faulty video board needs to be replaced by the manufacturer
DC Controllers
Most portable computers include a DC controller, which is designed to monitor and regulate power usage The function of DC controllers can vary with the manufacturer, but typically, they provide short-circuit protection, give low battery warnings, and can be configured to automatically shut down the portable when the power is low
LCD Panel
To add to their portability, portable computers use thin LCDs Although their display abilities are typically not as good as those of CRTs, LCDs are much thinner (1 to 2 inches thick) and require much less power The first LCD panels were called passive matrix displays A passive matrix display is made up of a grid of horizontal and vertical wires At one end of each wire is a transistor, which receives display signals from the computer When two transistors (one at the x axis and one at the y axis) send voltage along their wires, the pixel at the intersection of the two wires is lit Active matrix displays are newer and use different technology, called thin-film transistor (TFT) technology Active matrix displays contain transistors at each pixel, resulting in more colors, better resolution, a better ability to display moving objects, and the ability to be viewed at greater angles However, active matrix displays use more power than passive matrix displays LCD displays cannot be repaired That means a faulty display in a portable will need to be replaced by the manufacturer of the portable
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