Solving Internal Display Problems - HP Z1 G3 Maintenance And Service Manual

Solving internal display problems

Problem
Blank screen (no video).
The display works
properly during the POST
but goes blank when the
operating system starts.
Backlight level is turned
all the way down in
software environment
settings
Power LED flashes red
three times with long
beeps, followed by three
short beeps, while LED
flashes with short beeps,
and pattern repeats.
Dim characters
Cause Solution
Cable connections are 1.
not correct.
2.
Screen blanking utility Press a key or the mouse button and, if set, enter your password.
installed or energy
saver features enabled.
System ROM is bad; Reflash the ROM using a SoftPaq.
system is running in
FailSafe Boot Block
mode (indicated by 8
beeps).
Computer is in Press the power button to resume from Hibernate mode.
Hibernate mode.
Backlight circuit on Replace the motherboard.
motherboard is
damaged.
The display settings in For Windows:
the operating system
1.
are incompatible with
the internal LCD panel.
2.
3.
4.
This can happen if a utility has been used to set it to a very low level.
Resetting to a usable value requires actions typically using the same utility
that was originally used. Some OSes and environments may have other
means for resetting.
Prevideo graphics error. Try these solutions in this order:
●
●
●
Processor does not Try either solution:
support graphics
●
output and no discrete
graphics card is
●
installed.
Brightness and contrast In Windows, go to Control Panel, select Power Options, and then adjust
controls are not set the internal LCD panel brightness and contrast controls using the Screen
properly. Brightness slider bar at the bottom of the window.
Cables are not properly
1.
connected.
Verify the LCD display cable connection to J202 on the system board
and to the internal LCD panel connector.
Verify the LED backlight cable connection to P190 on the system
board (see item 19 on System board components on page
the LED power connector on the internal LCD panel.
Restart your computer in Windows Safe Mode.
Uninstall the graphics driver for the graphics controller (Intel HD
Graphics or NVIDIA Graphics).
Reboot in normal Windows mode.
Install the latest graphics driver for the graphics controller you are
using (Intel HD Graphics or NVIDIA Graphics).
Reseat the graphics card if using nVidia graphics; reseat the
processor if using Intel HD Graphics.
Replace the graphics card if using nVidia graphics or replace the
processor if using Intel HD graphics.
Replace the system board.
Install a processor with Intel HD Graphics.
Install a supported graphics card.
Open the computer.
Troubleshooting scenarios and solutions
5) and to
55