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Hi. Noticed the sat nav screen flickering this morning. It stopped after a few mins and worked ok. Drove and when i restarted the screen was blank. When you turn on ign the lexus symbol shows for a second then screen goes blank. 

If u press the climate or audio button and guess where to press the screen it works fine. 

Any ideas would be welcome. 

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The problem you have is with the "back light". This is a cold cathode fluorescent tube. It can be replaced, but requires careful dismantling of the screen. It is probably easier to replace the complete unit with a second hand unit for most people.

John.

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