HP ZBook 17 G4 Mobile Workstation User Manual

Mechanical
Fan error message - 90B
Symptoms
Fan error 90B at boot
CAUTION: May lead to system
shutdown, data loss or possible system
damage.
Possible causes
Defective fan; out-of-date BIOS.
●
The system fan is not spinning or not spinning properly (loose connection, fan is stuck
or defective).
●
The temperature inside the case is too high, and the fan cannot spin fast enough to
remove the heat due to an obstruction to air ow.
Troubleshooting steps
General actions
1. Update BIOS and drivers (4. Update BIOS and drivers on page 80) or reset BIOS to
default. BIOS may implement new fan characteristics and updates for other
components.
2. Perform a hard reset (8. Hard reset on page 90). Performing a hard reset can reset
recorded thermal values in memory.
Thermal-related issue
1. Verify thermal condition:
a. Check fan and connection. Reseat fan cable.
b. Be sure that no obstructions or dust are in heat sink fan, n, or vent.
c. Test fan using HP PC Hardware Diagnostics (UEFI) tool (6. HP Hardware
Diagnostics and Tools on page 81). Be sure that the fan is not producing loud
noise and that fan blades spin correctly.
d. Test with a veried working fan.
e. Remove old thermal compound and pads, and replace properly with new pads.
2. Verify thermal solution
▲ Use Thermal Monitor tool (available only to authorized service providers/
technicians) to run stress test (processor and GPU) and verify that thermal
sensors are within limits after thermal condition is serviced.
Note BIOS currently omits fan presence detection to shorten boot time delay less than four
seconds. Therefore, the fan error is generated based on previous boot to operating system
that found system fan error.
Fan often is part of thermal solution, including heat sink, n/ muer, and thermal grease.
Fan replacement requires reboot and fan function verication using HP PC Hardware
Diagnostics (UEFI) tool.
136 Chapter 7 Troubleshooting guide

HP ZBook 17 G4 Mobile Workstation Specifications

General

Brand	HP
Model	ZBook 17 G4 Mobile Workstation
Category	Laptop
Language	English

Summary

Product Description

External Component Identification

Locating Hardware and Software

How to find installed hardware and software on the computer.

External Component Locations

Identifies components on the right, left, top, bottom, and front of the computer.

Indicators, Buttons, and Keys

Explains indicator lights, power buttons, special function keys, and hot keys.

System Information Location

Explains how to locate essential system information on the computer.

Illustrated Parts Catalog

Computer Major Components

Lists and illustrates the main components of the computer.

Display Assembly Subcomponents

Details the subcomponents of the display assembly.

Miscellaneous Parts

Lists various miscellaneous parts and accessories.

Removal and Replacement Procedures Preliminary Requirements

Tools and General Precautions

Lists required tools and general considerations for disassembly.

Component Handling Guidelines

Guidelines for handling cables, connectors, and fragile drive components.

ESD and Workstation Safety

Covers grounding, packaging, workstation, and equipment safety guidelines.

Removal and Replacement Procedures for Customer Self-Repair Parts

Component Replacement Procedures Overview

Introduces the procedures for replacing customer self-repair parts.

Service Door

Step-by-step instructions to remove and replace the service door.

Battery

Step-by-step instructions to remove and replace the battery.

Base Enclosure

Step-by-step instructions to remove and replace the base enclosure.

Hard Drive and Internal Frame

Procedures for removing and replacing hard drives and internal frames.

Solid-State Drives (M.2)

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

WLAN Module

Procedures for removing and replacing the WLAN module.

WWAN Module

Procedures for removing and replacing the WWAN module.

Memory Module

Procedures for removing and replacing memory modules.

Removal and Replacement Procedures for Authorized Service Provider Parts

Component Replacement Procedures

Introduces procedures for parts accessed by authorized service providers.

RTC Battery

Procedures for removing and replacing the RTC battery.

Speakers

Procedures for removing and replacing the speakers.

TouchPad

Procedures for removing and replacing the TouchPad.

Smart Card Reader and Frame

Procedures for removing and replacing the smart card reader.

Fingerprint Reader Board

Procedures for removing and replacing the fingerprint reader board.

Fan

Procedures for removing and replacing internal fans.

Heat Sink

Procedures for removing and replacing the heat sink.

Discrete Graphics Board

Procedures for removing and replacing the discrete graphics board.

Display LED Board

Procedures for removing and replacing the display LED board.

Keyboard

Procedures for removing and replacing the keyboard.

System Board

Procedures for removing and replacing the system board.

Display Assembly

Procedures for removing and replacing the display assembly.

Troubleshooting Guide

General Troubleshooting Steps

Outlines general steps and methodology for troubleshooting.

Identify the Issue

Step one: understanding the issue and the boot-up sequence.

Failure Classification

Classifies failures based on boot-up sequence and hardware.

Analyze the Issue

Steps to analyze the cause of an issue.

Common Issues and Possible Solutions

Addresses common issues with symptoms and potential solutions.

Using HP PC Hardware Diagnostics (UEFI)

Downloading HP PC Hardware Diagnostics (UEFI) to a USB Device

Instructions for downloading the HP PC Hardware Diagnostics tool.

Additional BIOS Crisis Recovery Tool

Information about the BIOS crisis recovery tool.

Specifications

Computer Specifications

Provides detailed technical specifications of the computer.

Power Cord Set Requirements

Requirements for All Countries

Outlines general power cord set requirements applicable globally.

Requirements for Specific Countries and Regions

Lists power cord set requirements for specific countries and regions.

Statement of Memory Volatility

Nonvolatile Memory Usage

Explains the usage and characteristics of nonvolatile memory.

Questions and Answers

Provides answers to frequently asked questions about BIOS and memory.

Recycling