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Problem with screen backlight

  • 18-12-2010 6:16pm
    #1
    Dempsey
    Registered Users, Registered Users 2 Posts: 20,553 ✭✭✭✭


    I have a laptop here and it runs fine except for the fact that when I plug in the AC Mains, the screen backlight turns off and doesnt come back on until I force a restart.

    When I'm forcing a shutdown/restart, the backlight comes on for a second just before the power is cut.

    Anyone any ideas why this is happening and what can I do to fix it?

    EDIT

    If I plug in the power, the light cuts out. but if I plug it out and press "Fn + CRT/LCD" the backlight comes back on.

    When I try the "Fn + CRT/LCD" when the AC connected, it tries to come on for a split second.


Comments

  • #2
    Dempsey
    Registered Users, Registered Users 2 Posts: 20,553 ✭✭✭✭Dempsey


    Actually narrowed it down to when high performance settings come into play

    When I active the high performance power plan, the back light turns off.

    I have to carefully select one of the other power plans before I can press "Fn + CRT/LCD" to activate the backlight.

    Anyone have any experience with this sort of problem?


  • #3
    hearny
    Registered Users, Registered Users 2 Posts: 953 ✭✭✭hearny


    Can you change all of the power plan settings so none of them disable the back light.
    Its not a HP by any chance is it.

    Check manufacturers website to see if its a common problem.


  • #4
    Dempsey
    Registered Users, Registered Users 2 Posts: 20,553 ✭✭✭✭Dempsey


    hearny wrote: »
    Can you change all of the power plan settings so none of them disable the back light.
    Its not a HP by any chance is it.

    Check manufacturers website to see if its a common problem.

    I changed all the power plan settings for AC to whatever the setting is for battery on the balanced plan. The backlight still cuts out but takes a few seconds to switch off, usually it cut out the very second I plugged in AC.

    It a Dell Inspiron 1525


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