i have been brought in a n Acer aspire 7520 Laptop for repair - basically on boot-up the screen comes on for a few seconds and then dims from one side to the other and remains dim. you can just about see the desktop Icons. Laptop is running windows vista, below is listed the steps I have already tried.
attached external monitor - this works fine but still dim screen on laptop
Have tried possible FN key combintaions - still no joy
have replaced the inverter - same problem
have replaced the screen - same issue
have checked all the cabling to screen and main borad this all appears to be OK
at a loss as to what i should check next - could this be a maqinboard issue?
any help will be greatly appreciated