This chapter provides troubleshooting tips and pin assignments for the DCD.
The following topics are covered:
If you have a problem with your monitors, first verify that the DCD appears in the hardware inventory list by following these steps:
Open a UNIX shell.
At the prompt, type:
hinv
Look for the following line that describes the DCD:
Dual Channel Display
If the above line does not appear, the troubleshooting tips in Table 5-1 may help you to isolate a problem.
Table 5-1. DCD Troubleshooting Tips
Symptom
Possible Cause
Dual Channel Display does not appear in hinv.
Either the board is installed incorrectly, or it is defective. If the board is installed in an Octane2, repeat the installation steps again, and make sure you insert the board correctly. If reseating the board does not solve the problem, the board may be defective. If these steps do not help, or if the board is installed in a Silicon Graphics Fuel workstation, call your SGI service representative.
Timing mode is set to single channel. See Chapter 3.
Monitors are blank.
Connect a monitor to the original monitor port and run hinv, as described in “If Both Monitors are Blank”
.
In single channel modes, one monitor displays the image correctly, but the other monitor's image is bad.
The board is probably defective. Contact your SGI service representative.
The images on both monitors alternate between the correct image and noise, a constant color, or a badly flickering image.
The board is probably defective. Contact your SGI service representative.
In dual channel mode, two superimposed flickering images appear on a monitor connected to the original graphics board monitor port.
Currently, the original graphics board monitor port is not disabled when the board is running in dual channel mode. If you connect a monitor to the original graphics board monitor port in dual channel mode, the monitor displays alternating images from the left and right channels.
If neither of your monitors has an image, follow the steps in the apropriate section below.
Remove the cover from the 13W3 monitor port on the VPro graphics board.
Connect a monitor to the 13W3 monitor port.
Open a UNIX shell.
At the prompt, enter hinv:
A hardware inventory list should appear, similar to the one shown in Figure 3-7.
Look for the following line that describes the DCD:
Dual Channel Display
If the above line does not appear, return to Table 5-1.
Connect a monitor to the original single DVI port on the graphics board.
Open a UNIX shell.
At the prompt, enter hinv:
A hardware inventory list will appear, similar to the one shown in Figure 3-7.
Look for the following line describing the DCD:
Dual Channel Display
If the above line does not appear, see Table 5-1 for additional information.
Table 5-2 lists the cable pinout assignments for both connectors on the DCD.
Table 5-2. DCD Pinout Assignment
Pin | Assignment |
| Pin | Assignment |
| Pin | Assignment |
|---|---|---|---|---|---|---|---|
1 | T.M.D.S. Data2- |
| 9 | T.M.D.S. Data1- |
| 17 | T.M.D.S. Data0- |
2 | T.M.D.S. Data2+ |
| 10 | T.M.D.S. Data1+ |
| 18 | T.M.D.S. Data0+ |
3 | T.M.D.S. Data2/4 Shield |
| 11 | T.M.D.S. Data1/3 Shield |
| 19 | T.M.D.S. Data0/5 Shield |
4 | T.M.D.S. Data4- |
| 12 | T.M.D.S. Data3- |
| 20 | T.M.D.S. Data5- |
5 | T.M.D.S. Data4+ |
| 13 | T.M.D.S. Data3+ |
| 21 | T.M.D.S. Data5+ |
6 | DDC Clock |
| 14 | +5V Power |
| 22 | T.M.D.S. Clock Shield |
7 | DDC Data |
| 15 | Ground |
| 23 | T.M.D.S. Clock + |
8 | Analog Vertical Sync |
| 16 | Hot Plug Detect |
| 24 | T.M.D.S. Clock- |
C1 | Analog Red |
| C2 | Analog Green |
| C3 | Analog Blue |
C4 | Analog Horizontal Sync |
| C5 | Analog Ground |
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