Tech Notes: Dell� UltraScan� 21HS Monitor (Nokia 2128-T)
Tech Notes: Dell UltraScan 21HS Monitor (Nokia 2128-T)
Self-Test | Pinouts
| Display Modes | Access
Bus Connector | Monitor Installation |
Turning the Monitor On and Off | Troubleshooting
To access the self-test mode, first turn off the monitor and
disconnect the video cable from the computer. Turn the monitor
back on. The power LED will be green and a self-test image will
be displayed. The self-test image displays red, green, and blue
bars on a white background. If the self-test image is displayed,
any video problems are probably originating elsewhere in the
system. Since the self-test mode does not test the cable, be sure
to examine the video cable connector for bent pins.
Pin
Number |
Description |
| 1 |
Red |
| 2 |
Green |
| 3 |
Blue |
| 4 |
Monitor identification (LG) |
| 5 |
Ground (DDC) |
| 6 |
Ground (R) |
| 7 |
Ground (G) |
| 8 |
Ground (B) |
| 9 |
+5 V |
| 10 |
Ground (logic) |
| 11 |
Monitor identification (LG) |
| 12 |
DDC SDA |
| 13 |
Horizontal synchronization |
| 14 |
Vertical synchronization |
| 15 |
DDC SCL |
| Number |
System |
Addressability |
Refresh Rate |
Line Frequency |
| 1 |
PC |
1600 x 1200 |
75.0 |
93.76 |
| 2 |
PC |
1280 x 1024 |
85.0 |
91.15 |
| 3 |
PC |
1280 x 1024 |
75.0 |
79.97 |
| 4 |
PC |
1024 x 768 |
85.0 |
68.67 |
| 5 |
PC |
1024 x 768 |
75.0 |
60.02 |
| 6 |
PC |
1024 x 768 |
70.1 |
56.49 |
| 7 |
PC |
800 x 600 |
75.0 |
46.88 |
| 8 |
PC |
800 x 600 |
60.3 |
37.88 |
| 9 |
PC |
640 x 480 |
75.0 |
37.50 |
| 10 |
PC |
640 x 480 |
59.9 |
31.47 |
| 11 - 14 |
PC |
Empty |
|
|
Pin
Number |
Description |
| 1 |
Ground |
| 2 |
DDC SDA (I2C signal) |
| 3 |
+ 5V |
| 4 |
DDC SCL (I2C signal) |
- Connect the signal cable to the video controller
connector at the back of the computer.
- Tighten the screws by hand.
- Connect the power cord first to the monitor and then to a
grounded power outlet.
- Turn on the power for both the computer and the monitor.
The picture should appear within 20 seconds. Adjust the
picture to obtain optimum picture quality.
If Your Computer is DDC-Compatible
- Do not use any adapters when connecting a signal cable to
your computer.
- Do not extend the signal cable with an extension lead.
The DDC signals will not accept extended cable.
If There is No DDC in Your Computer
There is no need for an adapter when connecting the signal
cable to your computer.
If the power management function of your computer is working
properly, you do not need to switch the monitor on or off; it
happens automatically.
 |
NOTE: The power switch does not
disconnect the monitor from the main lead. In the
power-off state, the power consumption of the monitor is
less than 5 W. The only way to isolate the monitor
completely from the main supply is to unplug the main
lead. |
Press the power switch to turn the monitor on or off. When the
power is turned on, the power-on indicator will light. The color
of the power-on indicator represents the operating state of the
monitor.
| Green |
The monitor is in normal operation or standby state. |
| Orange |
The monitor is in automatic power-off state. |
| Not illuminated |
The monitor's power switch is turned off or the
monitor is disconnected from the main outlet. |
If the SELF TEST message appears when the monitor is switched
on, the signal cable has come loose from the computer.
| Symptom |
Possible Solution |
| The indicator on the front panel is not
illuminated |
Check that the power cord is correctly
connected to the monitor and the power outlet. If the
monitor is powered through the computer, check that the
computer is switched on. Check to see if the electrical
outlet is getting electricity. Unplug the monitor from
the power outlet for about one minute. |
| The indicator on the front panel is
illuminated |
The monitor might be in standby mode.
Press one of the keyboard buttons. Check that the
keyboard is connected to the computer. Check that the
signal cable connector is properly connected. If the
connector is loose, tighten the connector's screws.
Unplug the monitor from the power outlet for about one
minute. |
| Screen image is not centered or sized
properly, or edges of image are curved |
Your computer may use a display mode for
which the corresponding picture properties have not been
set at the factory. |
| Ghosting |
Check that the signal cable of the
monitor is properly connected to the computer. Check that
no extension cable is used in the monitor signal cable. |
| Picture is fuzzy |
Adjust contrast and brightness controls.
Set moire adjustment to center position (50%). |
| Picture bounces or a wave pattern is
present |
Move electrical devices that may be
causing interference away from the monitor. |
| Picture is scrambled |
Make sure the computer and video card
are properly configured for your monitor. |
| Color is not uniform |
Demagnetize the monitor. If color defect
is repeated without the monitor having been moved, it is
possible that the monitor is influenced by a strong
electric interference field. Try to find another
location for the monitor or the cause of the
interference. Note that another monitor placed too near
may also generate interference in the picture. |
| Monitor cannot be adjusted with buttons
on front panel |
Unplug the monitor from the power outlet
for about one minute. |
| SIGNAL OUT OF RANGE message appears |
The computer uses a display mode that is
out of the monitor's synchronization range. Make sure the
computer and video card are properly configured for your
monitor. |
| 
