Grounding guidelines

Electrostatic discharge damage

Electronic components are sensitive to electrostatic discharge (ESD). Circuitry design and structure determine the degree of sensitivity. Networks built into many integrated circuits provide some protection, but in many cases, ESD contains enough power to alter device parameters or melt silicon junctions.

A discharge of static electricity from a finger or other conductor can destroy static-sensitive devices or microcircuitry. Even if the spark is neither felt nor heard, damage may have occurred.

An electronic device exposed to ESD may not be affected at all and can work perfectly throughout a normal cycle. Or the device may function normally for a while, then degrade in the internal layers, reducing its life expectancy.

CAUTION: To prevent damage to the computer when you are removing or installing internal components, observe these precautions:

Keep components in their electrostatic-safe containers until you are ready to install them.

Use nonmagnetic tools.

Before touching an electronic component, discharge static electricity by using the guidelines described in this section.

Avoid touching pins, leads, and circuitry. Handle electronic components as little as possible.

If you remove a component, place it in an electrostatic-safe container.

The following table shows how humidity affects the electrostatic voltage levels generated by different activities.

CAUTION: A product can be degraded by as little as 700 V.

Typical electrostatic voltage levels

 

 

Relative humidity

 

 

 

 

 

Event

10%

40%

55%

 

 

 

 

Walking across carpet

35,000 V

15,000 V

7,500 V

 

 

 

 

Walking across vinyl floor

12,000 V

5,000 V

3,000 V

 

 

 

 

Motions of bench worker

6,000 V

800 V

400 V

 

 

 

 

Removing DIPS from plastic tube

2,000 V

700 V

400 V

 

 

 

 

Removing DIPS from vinyl tray

11,500 V

4,000 V

2,000 V

 

 

 

 

Removing DIPS from Styrofoam

14,500 V

5,000 V

3,500 V

 

 

 

 

Removing bubble pack from PCB

26,500 V

20,000 V

7,000 V

 

 

 

 

Packing PCBs in foam-lined box

21,000 V

11,000 V

5,000 V

 

 

 

 

46 Chapter 4 Removal and replacement procedures

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HP DV5 manual Grounding guidelines, Typical electrostatic voltage levels, Event 10% 40% 55%
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DV5 specifications

The HP DV5 series, part of HP's Pavilion line, is a versatile notebook computer that has gained popularity for its stylish design and robust performance. Introduced in the late 2000s, the DV5 quickly became a favorite among students and casual users for its combination of performance and portability.

One of the main features of the HP DV5 is its sleek, modern aesthetic. The laptop often sports a metallic or brushed aluminum finish, providing a premium look and feel. The 15.4-inch display offers vibrant visuals, making it suitable for a variety of tasks, from watching movies to editing photos. With a resolution typically around 1280 x 800, the screen displays sharp images and allows for comfortable viewing angles.

In terms of performance, the HP DV5 is equipped with various Intel or AMD processors, depending on the model and configuration. These processors can handle everyday tasks with ease, such as browsing the internet, running office applications, and multimedia playback. With configurations that allow for up to 8GB of RAM and various hard disk drive options, including traditional HDDs and faster SSDs, users can enjoy a responsive computing experience.

The DV5 series also integrates sophisticated audio technology, often featuring HP’s Altec Lansing speakers and Dolby Advanced Audio. This setup makes the laptop an excellent choice for entertainment, providing an immersive sound experience for music, movies, and games.

Connectivity options on the HP DV5 include multiple USB ports, HDMI outputs, and an integrated card reader, allowing users to connect a range of devices. Additionally, built-in Wi-Fi and Bluetooth capabilities enable seamless wireless connectivity, vital for modern computing needs.

The HP DV5 is designed with user convenience in mind. The keyboard is typically full-sized and features a comfortable layout suitable for typing long documents. The touchpad is responsive, offering multi-touch gestures for intuitive navigation.

Overall, the HP DV5 series stands out for its blend of design, performance, and multimedia capabilities, catering to a wide array of users looking for a reliable and attractive laptop. Even as newer models emerge, the DV5 remains a noteworthy option for those seeking a solid balance of style and functionality.
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