Tech Notes: Dell™ D1025HTX (UltraScan™ 1000TX)

Degaussing the Monitor | Self-Test Mode | Power-Saving Function | Pinouts | Plug and Play | Troubleshooting


Degaussing the Monitor

Turn power to the monitor off and then on to autodegauss the monitor. Before degaussing a second time, wait a minimum of 20 minutes (for best results).


Self-Test Mode

To perform self-test, the monitor should be turned on and the signal cable removed.

NOTE: The monitor does not enter power management mode during the self-test.

White Raster Test

Press and hold the power switch on for five seconds to display a white raster image. If the screen illuminates, the monitor's power supply, horizontal and vertical deflection circuits, and part of the video circuits are functioning.

RGB Test

Press and hold the power switch on for eight seconds to display an RGB test image. This test can help determine if one of the electron guns is malfunctioning.

The self-test can be very useful when troubleshooting for problems such as missing colors. However, it cannot identify some problems, such as bent pins on cable connectors.


Power-Saving Function

The Power-Saving function has the following default settings:

        LED
Indicator Status
State Activation Return to Normal Power Use Power
(green)
Savings
(orange)
Standby Inactive H-sync 3 seconds <15 W On On
Suspend Inactive V-sync 3 seconds <15 W On On
Active off Inactive V-sync and H-sync 10 seconds

<8 W

Off On

Pinouts

Pinouts for the 15-pin video connector are described in the following table:

Pin Number Description
1 Red
2 Green (composite sync on green)
3 Blue
4 Ground
5 CPU sense
6 Red ground
7 Green ground
8 Blue ground
9 DDC +5 V*
10 Ground
11 Ground
12 SDA (serial data)
13 Horizontal synchronization
14 Vertical synchronization
15 SCL (serial clock)

* Display Data Channel (DDC) VESAŽ standard.


Plug and Play

This monitor complies with the DDC1, DDC2B, and DDC2AB, which are DCC VESA standards.


Troubleshooting

Symptom Possible Solution
No picture. Adjust the brightness and contrast controls.

Make sure that both the power and signal cables are securely connected to the back of the computer.

Perform a self-test.

Check for bent pins on the 15-pin video connector.

If the power indicator and/or the power-saving indicator are flashing, turn the monitor off and then on again. If the indicator(s) is still flashing, a monitor problem is possible.

Picture is scrambled. Make sure your system's graphics mode and video frequency are supported by this monitor. Even within the proper range, some video boards may have a sync pulse that is too narrow for the monitor to synchronize with correctly.
Color isn't uniform. Turn power to the monitor off, then on to autodegauss the monitor. Before degaussing a second time, wait a minimum of 20 minutes (for best results).
White doesn't look white. Adjust the color temperature.

Degauss the monitor.

Edges of image are curved. Adjust the pincushion.
Picture is fuzzy. Adjust the brightness and contrast.

Turn the power switch off and then on to autodegauss the monitor. Before degaussing a second time, wait a minimum of 20 minutes (for best results).

Ensure that you are using the prime video mode (see Specifications).

Make sure the CPU is not in an interlaced video mode.

Picture bounces or has wavy oscillations. Isolate and eliminate nearby sources of electric or magnetic fields.

Try plugging the monitor into a different AC outlet, preferably on a different circuit.

Picture appears to be ghosting. Remove any video extension cables or video switch boxes.
Two fine horizontal lines are visible on the screen. These are the damper wires; they stabilize the vertically striped aperture grill. See Specifications.
Wavy or elliptical (moire) pattern is visible. Cancel the moire.

Change the background pattern on your desktop.