HP Z240 Maintenance And Service Manual page 80

Problem
Blurry video or requested resolution
cannot be set.
The picture is broken up, rolls, jitters,
or flashes.
Vibrating or rattling noise coming
from inside a CRT monitor when
powered on.
Clicking noise coming from inside a
CRT monitor.
High pitched noise coming from
inside a flat-panel monitor.
Fuzzy focus; streaking, ghosting, or
shadowing effects; horizontal
scrolling lines; faint vertical bars; or
unable to center the picture on the
screen (flat-panel monitors using an
analog VGA input connection only.)
Some typed symbols do not appear
correctly.
70 Chapter 4 Diagnostics and troubleshooting
Cause
Cables are not properly
connected.
If the graphics controller was
upgraded, the correct video
drivers might not be loaded.
Monitor cannot display
requested resolution.
The monitor connections might
be faulty, or the monitor might
be incorrectly adjusted.
Monitor must be degaussed.
Monitor degaussing coil has
been activated.
Electronic relays have been
activated inside the monitor.
Brightness and contrast settings
are too high.
Flat-panel monitor's internal
digital conversion circuits might
be unable to correctly interpret
the output synchronization of
the graphics card.
The font you are using does not
support that symbol.
Solution
Verify that the graphics cable is connected to the graphics
card and the monitor.
Install the video drivers included in the upgrade kit, or
download and install the latest drivers for your graphics card
from http://welcome.hp.com/country/us/en/support.html.
Change the requested resolution.
1. Be sure the monitor cable is securely connected to the
computer.
2. In a multiple CRT monitor system, make sure that the
monitors' electromagnetic fields are not interfering with
each other. Move them apart if necessary.
3. Move fluorescent lights or fans that are too close to the
CRT monitor.
Degauss the monitor.
None. It is normal for the degaussing coil to be activated when
the monitor is turned on.
None. It is normal for some monitors to make a clicking noise
when turned on and off, when going in and out of Standby
mode, and when changing resolutions.
Lower brightness and contrast settings.
1. Select the monitor's Auto-Adjustment option in the
monitor's onscreen display menu.
2. Manually synchronize the Clock and Clock Phase
onscreen display functions.
3. Download SoftPaq SP22333 to assist with the
synchronization).
Use the Character Map to locate and select the appropriate
symbol.
For Windows 7, select Start > All Programs > Accessories >
System Tools > Character Map. You can copy the symbol
from the Character Map into a document.
For Windows 8.1, from the Start screen, type character
map. The application appears under the Apps heading.
(Windows 10) Type character in the taskbar search box,
and then select Character Map.