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Hi I Have Checked All Fuses But Is It Difficult Tp Get The Trim Off Inside Do You Know Tanks For Your Help Kea.
 

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I am sure you will have done this (but it did take me a few days to work out when I got my first 166).
One of the two round knobs on either side of the unit is also an on/off button - I can't remember which as I always have the unit switched on. You have to push in the button to switch the unit on or off.
Sorry if you already know this.
Chris
 
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If you have tried everything (including the 'Dark' button) then it is possible that the backlight or the backlight inverter for the LCD screen has blown.
Unfortunately the backlight is a U shaped one and they are not easy to find.
Try this. Wait until it's dark outside and start the car normally. Get a torch or use the light from a mobile phone and shine it just above the screen. If you can faintly see the display then it is more than likely the backlight problem.

Like I say, only after you have tried everything else, might this be the cause.
 
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