If this is like all the rest the unit needs to be unplugged until it is fixed since the usual means that if left in service could result in more boards in need of replacement. Call LG and see if they will look at it. Be sure to mentions "Is it BAD CAPS?" to see if what they think.
I have a LG32LC7D, purchased in 2007, that has started to take 5 to 20 minutes to turn on over the last few weeks. Does anyone know what the cause may be and how to fix it? And how expensive it would be to fix?