How do I lighten a dark picture

If your TV has already fully adjusted in brightness set up?, and there will be no good picture results?...try to adjust the "SCREEN-Screw" at the flyback slowly. If the picture still dark'?. the picture tube has need to rejuvenate.

If your settings on the camera were set to daylight and it was really bright, the camera would have put a filter on the pic so there is not just a bright blur on the pic. If settings on camera are okay, then just use some photo editing software to lighten the pic. It could also be your setting on your computer. Or the settings in the movie maker. When I've used the Movie Maker I noticed the visuals were a little dark as if the contrast was off, but after viewing it the screens were fine. It may be due to the Movie Maker software compressing the pictures and they look darker. Anyway, it's in the settings either on the camera or on the computer. But it could also be a problem with the camera shutter or lens.

Try to reset it by press and hold [^] button on remote than press [power] on TV.

This sounds like low screen voltage(A1)try adjusting the a1 voltage bottom control on flyback transformer if you have a voltmeter, voltage on crt base possible market screen or A1 shoud be beteen 350/500 volts when making adjustment remember to take into account current taken by meter If voaltage will not adjust flyback transformer will have to replaced

My Fuji E550 manual says this icon indicates the autofocus cannot work effectively under the present conditions. If your image is too dark move to a distance of around 2m (6.6 ft) from the subject. Alternatively use AF lock to take the picture.
My thought -- might try taking the shot even if dark and lightening it extensively in a post production program like Picasa. I never discard a dark shot until I've tried this -- with many good results.

1. Whats your model and brand?

replace T-con board ( top centre of lcd panel ) lvds cable plugs into this

Replace the main board

maybe the slides are too dark, in other words, the pictures you took didn't have enough exposure therefore you it shows up dark.. You could always use photoshop or someother photo manipulation software to lighten the scan, same thing happens with my hp scanner with slide adapter, if it slides just show up dark, lightening it with software will help, unless it is unsaturated/shadows too dark, etc..

Hope this helps.

This IS an inverter issue. You need a new inverter. Open the LCD and find the inverter model number and search Ebay.
-CharlyV