i would check your fuses
Unfortunatly, you cant. This is a LCD (Liquid Crystalline Display) screen and is basically 'Self-Lighting'. If your display is no longer visible theres a good chance youll need to replace it.
To display the digital speedometer on the clock info display of an Opel Astra G, turn on the ignition without starting the engine. Then, press the "Menu" button on the dashboard until you navigate to the "Speed" option. Select it, and the digital speedometer should appear on the clock display. Note that the exact steps may vary slightly depending on the model year and trim.
To change the clock display on a Vauxhall Astra, first, turn on the ignition without starting the engine. Locate the "Menu" button on the dashboard or steering wheel controls, then navigate to the settings using the buttons. Look for the clock or time settings, where you can adjust the hours and minutes. Confirm the changes before exiting the menu.
To alter the clock on a 2006 Astra Design, turn the ignition to the "On" position without starting the engine. Press and hold the "Menu" button on the dashboard until the clock display appears. Use the buttons on the radio or the dashboard to adjust the hours and minutes, then press "Menu" again to save your changes.
Remove centre vents from dash, behind them you will find some screws, remove them and the centre dash will come off. Remove screws from display unit and the bulbs are accesible from rear, just twist them 45 degrees. Hope this helps
Temp does not display on Sharp Atomic Clock SPC 900
The fuse number for the clock display on a Vauxhall Astra can vary depending on the model year and type of electrical system. Typically, it can be found in the fuse box located in the dashboard or under the hood. To confirm the specific fuse number for your Astra, it's best to consult the owner's manual or the fuse box cover, which usually has a diagram indicating the fuse functions. If you're unsure, checking with a Vauxhall dealer or a repair manual may also help.
I had the same thing happen. I replaced the batteries in the outdoor sensor, but just got the two dashes on the clock that should display the outside temperature. After I replaced the batteries in the clock itself, the outside temperature then showed up properly on the clock. I also took all batteries out of both devices and replaced them in the order recommended in the directions on the back of the clock. I hope that helps.
lights on the radio and clock have gone off
Settings>Display>Clock>Analog
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Check the fuses. If they are good, the electroluminescent display has failed. The flourecence may have been affected by temperature change or age.