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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 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
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 Relative humidityEvent10%40%55%Walking across carpet35,000 V15,000 V7,500 VWalking across vinyl floor12,000 V5,000 V3,000 VMotions of bench worker6,000 V800 V400 VRemoving DIPS from plastic tube2,000 V700 V400 VRemoving DIPS from vinyl tray11,500 V4,000 V2,000 VRemoving DIPS from Styrofoam14,500 V5,000 V3,500 VRemoving bubble pack from PCB26,500 V20,000 V7,000 VPacking PCBs in foam-lined box21,000 V11,000 V5,000 VGrounding guidelines15
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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
●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.
16Chapter 4 Removal and replacement preliminary requirements
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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 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.
MaterialUseVoltage protection levelAntistatic plasticsBags1,500 VCarbon-loaded plasticFloor mats7,500 VMetallized laminateFloor mats5,000 VGrounding guidelines17
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5Removal and replacement procedures
This chapter provides removal and replacement procedures for authorized service provider only parts.
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.
Tablet component replacement procedures
There are as many as 13 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 numberBack cover796809-001Display panel assembly, 8.0-in (1280×800), AG, IPS, LED, multi-touch, wide-viewing angle, 5-point
capacitive, auto-rotate (selectable), tempered-glass, backlit, TouchScreen (includes bezel
and TouchScreen cable)796811-001
Before disassembling the tablet, follow these steps:
1.Turn off the tablet. If you are unsure whether the tablet is off or in Hibernation, turn the tablet on, and
then shut it down through the operating system.
2.Disconnect the power from the tablet by unplugging the power cord from the tablet.
3.Disconnect all external devices from the tablet.
Remove the back cover:
CAUTION:Before turning the tablet 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 panel.
1.Place the tablet on a flat surface, display panel side down, with the power button toward you.
2.Use the finger notch (1) in the front left corner of the back cover to lift the front edge (2) of the back
cover until it separates from the display panel assembly.
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3.Remove the back cover (3).
Reverse this procedure to install the back cover.