LG 37LCD2d My television seems to be turning the screen off after being on for an extended period of time. The longer I wait to turn it back on after this happens, the longer it takes for the "black screen of death" to happen. The backlight seems to still be on but there is no image and I am not able to change inputs. No audio coming through either. How would I go about fixing it or should I just take to a shop?

SOURCE: Vizio GV42L LCD TV screen black when turn TV on first time

If you are using a set top box this might be caused by turnig the box on at the same tie as you turn the tv on or slightly after you turn the tv on.  If you are using compnent or HDMI inputs the set needs to see the signal as it is turned on to know what formt the signal is in. 

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SOURCE: Sharp Aquos blacks out using PS2 & DVD player

Try to replace the main digital board.

SOURCE: Samsung 40 inch LCD LNS4092D No Picture

I had a very similar problem, TV was 1 day old! Samsung engineer came out and replaced the motherboard - all sorted now.

SOURCE: Olevia 37 lcdtv has to warm up be repowere for picture to display

It's your power supply. have it taken care of ASAP before damage happens on the board where it can't be repaired, just replaced, "if they can find one".

SOURCE: 20" lg LCD backlight turns off after about 5 seconds of use.

First, check the power supply for the backlight. It's usually a 24 volt supply. Look for swollen caps. If that is ok, go to the inverter board and inspect for damage, ohm out the inverter transformers. Last is to test out the lamps seperately with an external inverter. If a lamp goes out this way, it is bad and causing the whole backlight to go out.