camera turns on but screen back light not working.

My sister spilled water into her purse and some got on her DSC W150 camera. It wouldn't even turn on for days. After the internal battery discharged the camera was able to turn on but the display had no picture.

I took the camera and put it under a lamp and noticed that the display was actually on but the back light was dead. I hit the 'display' button of course to confirm this by cycling through the LCD on / off, and other functions like show histogram to confirm that the display wasn't simply turned off by default.

It appears that the camera functions fine, lens opens, zooms, and that I can read and navigate through the menu screens, under direct bright light. But I have no back light to make this camera useful. For example if the battery dies I have to set the date up upon boot up. So there's no way to switch to camera mode to skip this step.

So I don't know if I should replace the whole screen assembly (which I know the part #) or just the back light (unsure which part causes issue).

The other thought I had was that maybe the auto dimming light sensor was causing the LCD brightness all the way down.

What do you guys think I should do?

Thanks..

Tom