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DELL E6420 display gets dim !

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Hi All,


I would be very great full if some one can help me fixing my problem. My laptop was working fine till yesterday, but suddenly when i tried to decrease the brightness of the laptop by pressing FN+ Down arrow, my display started trembling. i thought there is some issue with my display driver so i re installed it. One thing i noticed that whenever i removed the charging cable the laptop display got perfect again and whenever i plug in the charger cable the display gets black again. Moreover after some even with out charger cable my screen went very dim and i can hardly see the things on it. I attached my laptop to my external monitor and there it was working perfectly fine for some time and then monitor display goes wrong too and eventually i had to restart my laptop. I also tried things using power options. I also removed my battery pressed power button for a while started my computer without battery and then inserted battery once again but it didn't help me. I ran diagnostics on my laptop but as the screen is very dim so i can hardly see its result but it was doing some thing.

Can somebody help me that what kind of problem it is and how it can be resolved ?

Looking forward for your responses thanks. !

Regards,

Hammad Ali


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