I have a Matrix 97 that I purchased used in July. Unit has been great until this past week. There is no backlighting to the display. You can make out the depth number on the screen if you look really close. When I turn the unit on the first screen that pops up looks fine you can read it with out any issuses. As soon as it goes away everything gets really dark. To dark to see. I have adjusted the light setting nothing changes. You can barely see the menu system. I have also reset to factory default with no change. Any advice would be greatly appreicate.