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The ballast board for sure. If the color doesn't come back, try cleaning all the lens elements in the box in front of the lamp. If that still doesn't restore the color correctly, then look at the color wheel.
Lets statrt with the obvious, did the lamp that you replaced showed any type of damage(blown, broken) and when you put in the replacement lamp did you also replaced the lamp cover? or at least remembered to activate the door switch? these tvs have a starter board if everything checks out see if you get any type of activation sound whent you turn the power on, kind of a click sound and another thing to look for is the ventilation fan, is it activating when you push the power button?
I'm sure that many lamps in these models get replaced unnecessarily. The problem is the contacts where the lamp assembly plugs in. Remove and replug the lamp.. Mine has aluminium foil jammed in the connectors for 2 years now and hasn't failed since.. Prior to doing that I had EXACTLY what you described. No more LG for me
By looking at the photo of the ballast on eBay, it doesn't appear to match the one that is in my television, but I haven't looked at it lately, but I will check it later this week and see if it perhaps matches. My set actually has a new bulb already in it, so I really won't need other bulbs right now since I don't have any extra money for backup parts. I might be interested in your ballast if our tvs take the same one; but like I said, I'll check later this week when i get back home and I'll let you know if it fits or not. Thanks, -Travis