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HP 255 G7 User Manual

HP 255 G7
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Maintenance and Service Guide
HP 255 G7 Notebook PC

Table of Contents

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HP 255 G7 Specifications

General IconGeneral
Form factorClamshell
Product typeLaptop
Product colorBlack
Country of originChina
Panel typeSVA
Color gamut45 %
LED backlightYes
RGB color spaceNTSC
Display diagonal15.6 \
Anti-glare screenAlways gives an optimal view, even in direct sunlight.
Display brightness220 cd/m²
Display resolution1366 x 768 pixels
Native aspect ratio16:9
sRGB coverage (typical)67 %
Display diagonal (metric)39.6 cm
Memory slots1x SO-DIMM
Internal memory4 GB
Memory clock speed1866 MHz
Memory form factorSO-DIMM
Internal memory typeDDR4-SDRAM
Maximum internal memory- GB
Memory layout (slots x size)1 x 4 GB
HDD speed7200 RPM
HDD interfaceSATA
Storage mediaHDD
Optical drive typeDVD±RW
Total storage capacity500 GB
Compatible memory cardsSD, SDHC, SDXC
Number of HDDs installed1
Discrete graphics card modelNot available
On-board graphics card modelAMD Radeon R4
On-board graphics card base frequency686 MHz
Number of built-in speakers2
Antenna type1x1
Wi-Fi standards802.11a, 802.11b, 802.11g, Wi-Fi 4 (802.11n), Wi-Fi 5 (802.11ac)
Bluetooth version4.2
Top Wi-Fi standardWi-Fi 5 (802.11ac)
WLAN controller modelRealtek RTL8821CE
Ethernet LAN data rates10, 100, 1000 Mbit/s
WLAN controller manufacturerRealtek
HDMI version1.4b
USB 2.0 ports quantityUSB 2.0 ports have a data transmission speed of 480 Mbps, and are backwards compatible with USB 1.1 ports. You can connect all kinds of peripheral devices to them.
USB 3.2 Gen 1 (3.1 Gen 1) Type-C ports quantity0
Pointing deviceTrackpad
Operating system architecture64-bit
Sustainability certificatesENERGY STAR
AC adapter power45 W
Battery weight180 g
Battery capacity41 Wh
Number of battery cells3
HP segmentBusiness
HP speaker typeHP Dual Speakers
Processor cache1 MB
Processor modelA6-9225
Processor familyAMD A6
Processor threads4
Processor frequency2.6 GHz
Processor cache typeL2
Processor lithography28 nm
Processor manufacturerAMD
Processor boost frequency3 GHz
Thermal Design Power (TDP)15 W
Weight and Dimensions IconWeight and Dimensions
Depth246 mm
Width376 mm
Height22.5 mm
Weight1780 g

Summary

Important Notice about Customer Self-Repair Parts

Safety Warning Notice

Getting to Know Your Computer

Right Side Components

Identifies and describes components located on the right side of the computer.

Left Side Components

Identifies and describes components located on the left side of the computer.

Display Components

Details of the computer's display, including WLAN antennas and camera.

Keyboard Area and TouchPad

Description of the keyboard layout and TouchPad functionality.

Lights and Indicators

Explains the function of indicator lights like Caps Lock and mute.

Buttons and Speakers

Identifies the power button, speakers, and vents on the computer.

Special Keyboard Keys

Description of special keys like Fn, Windows, and Num Lock.

Action Keys Functionality

Explains the functions performed by action keys (e.g., brightness, volume).

Bottom Components

Identifies components located on the bottom of the computer.

Computer Labels and Identification

Locates and explains the service and regulatory labels on the computer.

Product Description

Product Components and Descriptions

Details of computer components and their specifications.

Illustrated Parts Catalog

Computer Major Components

Visual catalog of main computer parts with their descriptions and part numbers.

Cables

Details about internal cables, including part numbers.

Display Assembly Subcomponents

Lists subcomponents of the display assembly and their part numbers.

Miscellaneous Parts

Catalog of miscellaneous parts like AC adapters and power cords.

Mass Storage Devices

Identifies and lists part numbers for storage devices like HDDs and SSDs.

Removal and Replacement Procedures Preliminary Requirements

Tools Required

Lists essential tools needed for component removal and replacement.

Service Considerations and Precautions

Important guidelines for handling parts, cables, and preventing damage.

Electrostatic Discharge (ESD) Information

Explains ESD risks and how to prevent damage to electronic components.

Packaging and Transporting Guidelines

Procedures for safely packaging and transporting computer components.

Removal and Replacement Procedures for Customer Self-Repair Parts

Preparation for Disassembly

Steps to prepare the computer before starting any removal procedure.

Optical Drive Removal

Step-by-step guide for removing and replacing the optical drive.

Removal and Replacement Procedures for Authorized Service Provider Parts

Bottom Cover Replacement

Procedure for removing and replacing the computer's bottom cover.

Battery Removal and Replacement

Detailed steps for removing and installing the laptop battery.

Memory Module Removal and Installation

Instructions for removing and installing RAM modules, including ESD precautions.

Hard Drive Removal and Replacement

Step-by-step guide for removing and replacing the computer's hard drive.

Solid-State Drive (SSD) Replacement

Procedures for removing and replacing M.2 solid-state drives.

WLAN Module Replacement

Instructions for removing and replacing the wireless LAN module.

Display Assembly Removal

Comprehensive steps for removing the entire display assembly.

Display Subcomponent Replacement

Procedures for replacing display subcomponents like bezel and camera.

System Board Replacement

Complete guide for removing and installing the system board.

Speaker Replacement

Steps for removing and replacing the computer speakers.

Top Cover with Keyboard Replacement

Instructions for replacing the top cover and integrated keyboard.

Computer Setup (BIOS), TPM, and HP Sure Start

Using Computer Setup

Guide to navigating and using the computer's BIOS/UEFI setup utility.

Updating the BIOS

Information on checking and downloading BIOS updates for the computer.

TPM BIOS Settings

Instructions for configuring Trusted Platform Module (TPM) settings in BIOS.

Using HP Sure Start

Explanation of HP Sure Start technology for BIOS protection and recovery.

Using HP PC Hardware Diagnostics

HP PC Hardware Diagnostics (Windows)

Guide to using the Windows-based diagnostic utility for hardware testing.

Downloading HP PC Hardware Diagnostics

Steps to download and install diagnostic tools for Windows and UEFI.

Using HP PC Hardware Diagnostics (UEFI)

How to run diagnostics from the UEFI environment when Windows won't boot.

Backing up, restoring, and recovering

Backing Up and Creating Recovery Media

Procedures for backing up personal data and creating system recovery media.

Restoring and Recovery Operations

Steps for restoring the system using recovery media or changing boot order.

Specifications

Computer Specifications

General specifications for the computer, including dimensions and weight.

Display Specifications

Detailed specifications for the 39.6-cm (15.6-in) display panel.

M.2 SATA Solid-State Drive Specifications

Technical specifications for M.2 SATA SSDs.

M.2 PCIe Solid-State Drive Specifications

Technical specifications for M.2 PCIe SSDs.

Hard Drive Specifications

Specifications for various hard drive capacities and types.

Power cord set requirements

Power Cord Requirements for All Countries

General requirements for power cord sets, including length and certification.

Power Cord Requirements for Specific Countries/Regions

Country-specific requirements and accredited agencies for power cords.

Statement of memory volatility

Current BIOS Steps for Data Removal

Steps to restore BIOS settings and remove personal data from memory.

Nonvolatile Memory Usage Details

Table detailing nonvolatile memory types, purpose, and write protection.

Questions and Answers

Restoring BIOS Settings to Factory Defaults

How to reset BIOS settings to their original factory configuration.

UEFI BIOS vs. Legacy BIOS

Explanation of UEFI BIOS and its differences from legacy BIOS.

Custom Secure Boot Keys Reset

Procedure for resetting Custom Secure Boot Keys.

Using HP Sure Start

Explanation of HP Sure Start technology for BIOS protection and recovery.

Recycling

Battery Disposal and Recycling

Guidelines for proper disposal of batteries and recycling electronic hardware.

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