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Laptop computers have power saver features that will blank the screen after a period of no input. Default on these can be as short as one minute. Users can change these settings to avoid screen blanking, especially when doing thins like watching movies or streaming video. The power saver feature may be different, and thus the screen shut off timer may be different when the unit is plugged in.
Try attaching an external monitor to the laptop & see if you could get any display on it. If this is successful, then you might have either a faulty LCD cable or screen inverter board. The
LCD cable transfers data signal from the motherboard & video card
to the LCD screen. It also supplies high voltage DC power to the screen
inverter board. The screen inverter board works as a power supply for
the backlight lamp mounted inside the LCD screen. It converts low
voltage DC power to high voltage AC power needed for the backlight lamp.
I had the exact same problem just last week when I aquired one of there Toshiba M115. Mine showed headphones only. What I did was I went and deleted the sound driver and went to toshiba.com and downloaded a new driver and it works now.
connections could be good in ribbon cable
but still needs to be replaced
the white screen indicates that the inverter is still good
if the laptop works with desktop monitor, then video card is good
if you tap the lid to the lcd and it goes on and off ,ribbon cable for sure,
everytime you open and close the screen , it tugs on the ribbon cable also , only tape holding this in place