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V1.0 Dvd Drive Madness - Only Thomson Works?


AlaskaCC
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A friend gave me a v1.0 board that was causing problems for him.  I put it in a standard early case, attached everything and proceeded to test it.  I wanted to update the BIOS (TSOP) so I attempted to run the Hexen DVD.  The DVD tray would open, I placed the disk in the tray and pushed the button to close.  The Unleash X menu continued to show "Open".  I tried this with two known good working DVD drives - one a Samsung and the other a Hitachi..  I changed cables and PSU with no difference.  I also checked to see if there were any bent pins for the DVD power cable.  All good.  I switched-out the power button/DVD drive button harness.  No difference.  Then I tried a good Thomson DVD drive.  Everything worked flawlessly..  What is that all about?  Is there a different command structure for the early v1.0 boards that limits which DVD drives will correctly operate with them?

 

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Sounds like a bad power/control cable (all yellow 12 wires), not the IDE cable.  This cable carries power and status signals to the PIC System Management Controller (SMC) about the tray status. 

5bc5793a09e40_DVDpowerandcontrolcablepinout.jpg.10d4d247058137bc983a93b6ad5f9c88.jpg

The picture above should state at DVD, not at MB. The motherboard end of the able has two more pins 13 and 14 with no connection (N/C). 

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