The inverter only powers the backlight. It looks like the backlight is working so I think it is safe to say that component is ok. Generally white washing is caused by a loose connection of the ribbon cable either at the LCD panel end, or the motherboard end. It could also be a faulty LCD ribbon cable. You can physically manipulate the cable while the computer is on and running, do this gently to prevent unplugging the cable while the computer is on. I generally flex the cable with my hands at the points where the cable bends near the hinges. Typically that is the location cables wear out first from years of opening/closing. If you notice any flashing or video artifacts while manipulating the cable, my bet is you have a bad cable.
The next possibility is a faulty LCD panel. You would need an extra panel to test with to rule this part out unfortunately. Cables are cheaper than lcd panels so I would vote for replacing the lcd ribbon cable before throwing money at a new lcd panel.
Lastly, you may have a video chipset problem. Can you attach an external monitor and let us know the results of that? If an external monitor works fine, typically it means the video chipset is ok, that doesn't rule out a motherboard problem 100% of the time but it is a good thing to test.
Edited by zingo156, 13 April 2015 - 03:49 PM.