Why does my dell inspiron e1505 screen go black after about 2 min when i plug it

my dell inspiron e1505 will make my screen go black after about 2 min its been on the charger and its not inactivity because i still use it after i plug it in the screen will just go black i already looked in power options but cant find a setting to change it

please help,thanks
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More about dell inspiron e1505 screen black plug
  1. Hello anwserbee27;

    What screen brightness are you using?
    Turn screen brightness down to ~20% and check how long it takes to go dark.
    Do the same at 50% and 80% settings.
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