Backlight goes dim when ac power is plugged in [Closed]

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19674
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Wednesday October 8, 2008
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June 15, 2019
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Hello,
I have a Lenovo Thinkpad T420 laptop. at first when i plugs its power supply the display would go dim, means there will be no backlight while there is display on the background. that was and always had been resolved when i closes its display and opens it again. but now it refuses to do so. now when i connect the power cord the diplay would go off(as mentioned above). when i unplug it also, the condition prevails. then i have to close the lid and open it again to access my desktop with bright screen. also i noticed that the refresh rate changes when i plugs in and off the power cord. it changes from 60hz to 50hz. please help!Any help will be appreciated.

Thanks

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Posts
19674
Registration date
Wednesday October 8, 2008
Status
Contributor
Last seen
June 15, 2019
6,384
Perhaps the display cable needs to be replaced. I suggest you find a qualified repair shop to do the work.

Good Luck