|
65.953 bytes |
Service Hints & Tips |
Document ID: MNOK-3Q5QCJ |
Aptiva - How to disable DDC on IBM Monitors and set refresh rates
Applicable to: World-Wide
Note: Disabling DDC may require changing settings on the monitor, in Windows 95, and in the BIOS. This procedure will give overall methods to turn off DDC and specific examples using the G50 and G70. The specific method for turning off DDC for each monitor is detailed in the User's Manual. The monitor refresh rates are also in the User Manual. The refresh examples with the G50 and G70 use settings that may not work with another monitor. Check the monitor documentation for the addressability and the refresh rate. Setting a monitor to use a higher addressability or resolution than it can handle will result in damage to your monitor. If the monitor settings are unknown, consult the manufacturer.
1. To determine if DDC is enabled on an IBM monitor, turn the monitor off using the power button while it is attached to the system unit. On the power button is a LED which can either be an amber or green color. When the monitor is turned on, look at the power led. If the led lights amber and then green, DDC is disabled. If the led goes straight to green with no amber color, DDC is enabled.
2. It is best to have something on screen since this makes it easier to notice that DDC is actually turned off. The buttons on the monitor's menu will be held down for 15 seconds until the screen flashes. To verify that DDC is disabled, turn off the monitor again. When the monitor is turned on the power led should light amber and then green.
For G50 monitors:
3. Starting from the left, there are 9 buttons on the front of the monitor. Each button has a left side which is a circular depression and a right side which has a circular bump. The button to turn off DDC is the button which looks like [/ \] or the 7th button from the left.
4. Determine if DDC is on by turning off the power button and then watching the led. To turn off DDC on the monitor, button 7 will be held down for 15 seconds until the screen flashes. Ensure DDC is turned off by turning the monitor off and then on. The monitor led should light amber and then green.
For G70 monitors:
5. Starting from the left, there are 11 buttons on the front of the monitor. Each button has a left side which is a circular depression and a right side which has a circular bump. The buttons used to disable DDC are the 9th and 11th buttons from the left. The 9th button has three color dots and the 11th button has a horseshoe with a line through it.
6. Determine if DDC is on by turning off and on the monitor by looking at the led. To turn off the DDC on the monitor, simultaneously hold down the right side of key 9 and the left side of key 11 for 15 seconds until the screen flashes. Ensure DDC is off by turning the monitor off and then on. The monitor LED should light amber and then green.
Operating System:
7. If running Windows 3.1 or OS/2, there are no settings which allow disabling DDC from the operating system. Go to the BIOS settings for Mxx systems. In Windows 95, click on the "Start" button and go to "Settings" and then "Control Panels". Click on the control panel menu item to bring up the control panel window.
8. Click on the "Display" icon to bring up the Display Properties window. Click on the "Settings" tab to bring the Settings Page forward. At the bottom of the page, click on the "Change Display Type" which should bring up the Change Display Type window. The display should look like the Figure 1. The change display type settings may have different adapter and monitor types. If the monitor does not say Plug and Play Monitor (VESA DDC), go to the BIOS section 13) to set up the custom refresh rates. If the monitor does say Plug and Play Monitor (VESA DDC), click on the Change button underneath the Monitor Type Text to get the Monitor Select Device Screen.
Figure 1. Change Display Type
9. When the Monitor Select Device screen comes up, the screen will be divided into a Manufacturers and a Models sections. Click on the circle next to the Show All Devices under the Manufacturer's window. A dot should appear in the circle and the display should look similar to the display in figure 2 below.
Figure 2. Select Device
10. If using an IBM monitor, select "IBM PC Company" as the manufacturer. Click on the appropriate IBM model type in the models section and click "OK" until out of the Display Properties. If not using an IBM monitor, select the appropriate manufacturer and model. Select the "OK" buttons to get out of the settings. Go to the BIOS section in section 13.
11. If the monitor type is not shown on the right side, select "Standard Monitor Types" as the manufacturer. With this highlighted on the left side, select the appropriate monitor from the models section. To know which option to select, consult the user's manual for the appropriate monitor. Do not select an address or resolution that your monitor can not handle. Conservative measures to use are to select Super VGA or SVGA 640X480 for 14 inch monitor (G40) , SVGA 800X600 for 15 inch monitors (G50) , and SVGA 1024X768 for 17 inch (G70) or large monitors. For a G50, SVGA 800X600 is an appropriate setting. If the monitor settings are unknown, consult the manufacturer. After selecting the appropriate mode, click the "OK" buttons to complete the Window's 95 settings.
BIOS Settings:
12. At this point, the Cxx and Sxx systems are configured to run the monitor in a Non DDC mode. The Mxx series must be configured in BIOS for a non DDC monitor. Click the "Start" Button and go to "Shut Down". When the Shut Down window comes up, click in the circle next to Shut Down the Computer. Click on the "OK" button. The computer will shut down. Let the computer sit for a minute.
13. To get into BIOS, the function key F1 must be pressed once when a white box with squiggly lines appears in the upper right corner of the screen. Power on the computer and look at the right upper corner. Press "F1" when the box appears. It may take a moment but then the Configuration Utility Menu should appear.
14. If only two lines of text appear on the menu, press "Ctrl+Alt+Del" and restart the computer. When the white square with text appears, press "F1" again. There should be multiple lines says System Information, Video and Monitor, Disk Drives, input/output Ports, and others. Using the up, down, left, and right arrows underneath the Delete, End, and Page Down keys; the choices can be chosen. Use the down arrow to move down the menu until the Video and Monitor text line is highlighted. Press the Enter key to select this option.
15. The next BIOS screen is the Video and Monitor Window. The Menu starts with Video Controller, Video Memory, Monitor Setup, and Refresh Rates. Using the Down Arrow, arrow down to the "Monitor Setup" and highlight it.
16. The DDC monitor type should be selected with the text Plug and Play DDC selection. Using the right arrow key, press the right arrow key until the "Set Refresh Rates" shows in the text box next to Monitor Setup.
17. Arrow down until the first selection "640x480" is highlighted.
18. Consult the documentation for your monitor's settings. If the monitor's settings are unknown, consult the manufacturer. The settings on the refresh rates are dependent upon the system unit and the video memory installed. The letter "I" next to a number means interlacing. If the monitor is known to be a VGA monitor but no other settings are known, the monitor can be set to 640X480 at 60 HZ. To select this setting when 640X480 is highlighted, press the right arrow key until this setting is in the text selection. While other numbers are shown, unless the monitor settings are known, this is the only resolution to use since other resolutions could damage the monitor.
19. For the IBM G50 and G70, the optimal settings for the monitor are:
- G50 640X480 at 85 HZ, 800X600 at 85 HZ, 1024X768 at 72 HZ. The rates 1280X1024 and 1600X1200 should be set to Not Supported.
-G70 640X480 at 85 HZ, 800X600 at 85 HZ, 1024X768 at 75 HZ, 1280X1024 60 HZ . The rate 1600X1200 should be set to Not Supported.
Lower frequency settings are okay but the frequencies can not be higher than the settings suggested above.
20. When the monitor settings are set, press the "ESC" key until the Exit Window appears. Save the settings and exit the BIOS. The system should reboot and the system will be configured to run in Non-DDC mode in the BIOS, OS, and Monitor.
|
Search Keywords |
| |
|
Hint Category |
Display/Monitor, Windows 95 | |
|
Date Created |
26-12-97 | |
|
Last Updated |
10-03-99 | |
|
Revision Date |
10-03-2000 | |
|
Brand |
IBM Aptiva | |
|
Product Family |
Aptiva | |
|
Machine Type |
2134, 2136, 2137, 2138, 2140, 2142, 2144, 2159, 2161, 2162, 2168, 2176 | |
|
Model |
All | |
|
TypeModel |
| |
|
Retain Tip (if applicable) |
| |
|
Reverse Doclinks |