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5 Removal and replacement preliminary
You will need the following tools to complete the removal and replacement procedures:
Magnetic screw driver
Torx 4 screw driver
Plastic case utility tool
The following sections include some of the considerations that you must keep in mind during disassembly
and assembly procedures.
NOTE:As you remove each subassembly from the tablet, place the subassembly (and all accompanying
screws) away from the work area to prevent damage.
CAUTION:Using excessive force during disassembly and reassembly can damage plastic parts. Use care
when handling the plastic parts. Apply pressure only at the points designated in the
Cables and connectors
CAUTION:When servicing the tablet, be sure that cables are placed in their proper locations during the
reassembly process. Improper cable placement can damage the tablet.
Cables must be handled with extreme care to avoid damage. Apply only the tension required to unseat or
seat the cables during removal and insertion. Handle cables by the connector whenever possible. In all cases,
avoid bending, twisting, or tearing cables. Be sure that cables are routed in such a way that they cannot be
caught or snagged by parts being removed or replaced. Handle flex cables with extreme care; these cables
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.
10 Chapter 5 Removal and replacement preliminary requirements
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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
CAUTION:To prevent damage to the tablet 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.
Before touching an electronic component, discharge static electricity by using the guidelines described in this
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
CAUTION:A product can be degraded by as little as 700 V.
Typical electrostatic voltage levels
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
Grounding guidelines 11
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Packaging and transporting guidelines
Follow these grounding guidelines when packaging and transporting equipment:
To avoid hand contact, transport products in static-safe tubes, bags, or boxes.
Protect ESD-sensitive parts and assemblies with conductive or approved containers or packaging.
Keep ESD-sensitive parts in their containers until the parts arrive at static-free workstations.
Place items on a grounded surface before removing items from their containers.
Always be properly grounded when touching a component or assembly.
Store reusable ESD-sensitive parts from assemblies in protective packaging or nonconductive foam.
Use transporters and conveyors made of antistatic belts and roller bushings. Be sure that mechanized
equipment used for moving materials is wired to ground and that proper materials are selected to avoid
static charging. When grounding is not possible, use an ionizer to dissipate electric charges.
Follow these grounding workstation guidelines:
Cover the workstation with approved static-shielding material.
Use a wrist strap connected to a properly grounded work surface and use properly grounded tools and
Use conductive field service tools, such as cutters, screw drivers, and vacuums.
When fixtures must directly contact dissipative surfaces, use fixtures made only of static-
Keep the work area free of nonconductive materials, such as ordinary plastic assembly aids
Handle ESD-sensitive components, parts, and assemblies by the case or PCM laminate. Handle these
items only at static-free workstations.
Avoid contact with pins, leads, or circuitry.
Turn off power and input signals before inserting or removing connectors or test equipment.
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Grounding equipment must include either a wrist strap or a foot strap at a grounded workstation.
When seated, wear a wrist strap connected to a grounded system. Wrist straps are flexible straps with a
minimum of one megohm ±10% resistance in the ground cords. To provide proper ground, wear a strap
snugly against the skin at all times. On grounded mats with banana-plug connectors, use alligator clips
to connect a wrist strap.
When standing, use foot straps and a grounded floor mat. Foot straps (heel, toe, or boot straps) can be
used at standing workstations and are compatible with most types of shoes or boots. On conductive
floors or dissipative floor mats, use foot straps on both feet with a minimum of one megohm resistance
between the operator and ground. To be effective, the conductive must be worn in contact with the
The following grounding equipment is recommended to prevent electrostatic damage:
Antistatic smocks, aprons, and sleeve protectors
Conductive bins and other assembly or soldering aids
Conductive tabletop workstations with ground cords of one megohm resistance
Static-dissipative tables or floor mats with hard ties to the ground
Field service kits
Static awareness labels
Nonconductive plastic bags, tubes, or boxes
Metal tote boxes
Electrostatic voltage levels and protective materials
The following table lists the shielding protection provided by antistatic bags and floor mats.
Material Use Voltage protection level
Antistatic plastics Bags 1,500 V
Carbon-loaded plastic Floor mats 7,500 V
Metallized laminate Floor mats 5,000 V
Grounding guidelines 13
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6 Removal and replacement procedures
Tablet component replacement procedures
CAUTION:Tablet components described in this chapter should only be accessed by an authorized service
provider. Accessing these parts can damage the tablet and void the warranty.
NOTE:HP continually improves and changes product parts. For complete and current information on
supported parts for your tablet, go to
http://partsurfer.hp.com, select your country or region, and then
follow the on-screen instructions.
This chapter provides removal and replacement procedures for authorized service provider only parts.
There are as many as 15 screws that must be removed, replaced, and/or loosened when servicing the tablet.
Make special note of each screw size and location during removal and replacement.
DescriptionSpare part number
7.8 in, HD, LED, TouchScreen, display panel assembly 793492-001
Before disassembling the tablet, follow these steps:
1.Turn off the tablet. If you are unsure whether the tablet is off, turn the tablet on, and then shut it down
through the operating system.
2.Disconnect the power from the tablet by unplugging the power adapter cord from the tablet.
3.Disconnect all external devices from the tablet.
Remove the back cover:
CAUTION:Before turning the display panel assembly upside down, make sure the work surface is clear of
tools, screws, and any other foreign objects. Failure to follow this caution can result in damage to the display
1.Place the tablet on a flat surface, display panel side down, with the SD card slot and volume control
buttons toward you.
2.Remove four Torx 4 screws (1) to release the bottom edge of the back cover (2) from the display panel
14 Chapter 6 Removal and replacement procedures