Laptop working, screen black, can see display w external moniter

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Hello, i have an older Dell latitude D800
laptop working, screen black, saw a flash on screen with moving it , but can see display and us computer normally with external moniter how can i trouble shoot or fix the screen


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Posts
47367
Registration date
Monday February 1, 2010
Status
Moderator
Last seen
September 1, 2021
11,144
Hi

You must have the back lights or inverter replaced.