HP ZBook 14u G4 Mobile Workstation Bedienungsanleitung PDF herunterladen (Seite 104)

NOTE: After the service door is removed, disconnect all connections (internal keyboard, display, discrete

GPU, hard drive/solid-state drive, daughterboards, etc.) to achieve the essential hardware conguration

above. DO NOT disassemble the system board from its enclosure at this time.

Reverse the procedure above by reinstalling each piece of hardware removed, one piece at a time, and testing

your computer after each installation. Since your computer works with only the essential hardware installed,

those parts must be working properly. This means that one of the hardware components removed is causing

the computer to not work properly. By installing each device back into the computer and testing each time,

the failing hardware will eventually be identied.

Safe mode

A driver conict often results in a blue screen error message. Therefore, booting in safe mode can resolve

many issues in Windows because safe mode forces the computer to load a limited version of Windows which

only contains essential les. Safe mode is useful for troubleshooting problems with programs and drivers

that might not start correctly or that might prevent Windows from starting correctly.

If a problem does not reappear when you start in safe mode, eliminate the default settings and basic device

drivers as possible causes. Refer to the link below for how to start your computer in safe mode:

●

HP PCs – Windows Safe Mode (Windows 10, 8)

12. Test with veried working conguration (hardware and/or operating system)

One troubleshooting technique that can quickly isolate an issue is using a veried working part while testing.

A good example is to use an external keyboard, mouse, or VGA monitor when you have issues with an internal

keyboard, TouchPad, or display. Testing with a veried working AC adapter can identify an error caused by a

faulty one. Similarly, testing with a veried working operating system can determine bad behaviors of the

current operating system. See Non HP diagnostics tools on page 85 for instructions about obtaining and using

a Windows-To-Go USB.

NOTE: In some situations, more than one item may contribute to a problem.

13. Replace the system board

The system board may be replaced only by authorized service providers. This should not be considered an

initial step taken to resolve an issue. Review and perform all steps discussed previously before replacing the

system board. 4. Update BIOS and drivers on page 81, 7. Status lights, blinking light codes, troubleshooting

lights, and POST error messages on page 86, 8. Hard reset on page 89, and 9. Soft reset (Default Settings)

on page 90, and/or 10. Reseat cables and connections on page 90 can resolve many system board issues

without requiring the eort of replacing unnecessary hardware.

Review Table 8-1 Troubleshooting methodology and general troubleshooting steps on page 77 for

appropriate troubleshooting steps.

IMPORTANT: System board failure is not common. Do not replace the system board until you have tried all

other troubleshooting options.

NOTE: Determine whether a previous service case might be related to the current problem. For example, a

fan detection issue may be caused by a loose connection resulting from previous service.

TIP: Without an RTC battery (3V coin-cell battery), the computer automatically reboots. This is a useful

feature when the power connector cable (between external AC adapter and system board) is defective.

92 Chapter 8 Troubleshooting guide

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HP ZBook 14u G4 Mobile Workstation Bedienungsanleitung Seite 104