Hope this gets you started in the right direction. It might be possible to get a service manual for you and give you some more specific details for your TV. It would be great if besides the model number you could find the Chassis number. In that case you could try to fix it by replacing the power board. The newer LG's have the inverter connected to the power board. Very costly, if you can even find somebody who has them for sale. Any bulging indicates a failed capacitor, The older LG's have the backlight inverter power separate from the power supply, and in that case you will require a new LCD Panel. Look for any leakage on the boards (looks like a oily sticky substance) and check the top of the capacitors. Check on the capacitors on your boards, they may be either loose or popped. Replace blown fuses, connect broken lines, and resolder loose solders. You want to definitely check on fuses or continuity of voltage supply lines going to the X Board/s, (your case check the X Board) as well as the LVDS cable. Tim, sounds to me like the backlight inverter is going out.
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