I have an acer laptop that powers on but monitors starts flickering, dims after 5-10 secs and the laptop goes to sleep. I see there is a white and black wire going into the monitor from what think is the wifi card. Could that be a connection problem?
There is also another block of wires wrapped in black that connect to a dock right above the keyboard, covered by the bezel and they also go in the monitor.
Is your LCD a CCFL or LED backlit version?
Could be a bad backlight tube or possibly a bad FL inverter if its a CCFL tube.
Here's what a backlight replacement job looks like: How to replace laptop backlight lamp (CCFL)