Backlight goes dim when ac power is plugged in

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Abhi - Dec 23, 2015 at 02:51 PM
xpcman Posts 19530 Registration date Wednesday October 8, 2008 Status Contributor Last seen June 15, 2019 - Dec 23, 2015 at 04:53 PM
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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1 response

xpcman Posts 19530 Registration date Wednesday October 8, 2008 Status Contributor Last seen June 15, 2019 1,825
Dec 23, 2015 at 04:53 PM
Perhaps the display cable needs to be replaced. I suggest you find a qualified repair shop to do the work.

Good Luck
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