Is my laptop lcd screen or inverter board out?

My laptop has had a white strip down the right side for a littlw while, now the left side is black about 1/4 of the screen. How do I know if it is the screen or the inverter board. Hate to buy the wrong one and waste all the money. It is a Toshiba Satellite P105-S6104. The backlight is on behind it. I know the... show more My laptop has had a white strip down the right side for a littlw while, now the left side is black about 1/4 of the screen. How do I know if it is the screen or the inverter board. Hate to buy the wrong one and waste all the money. It is a Toshiba Satellite P105-S6104. The backlight is on behind it. I know the light is good.
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