I've tried leaving it unplugged overnight and blowing dust out using canned air through the vent slots.
I would resolder the inverter chips about five of those on the inverter board first. If that doesn't fix it, try the Power Supply unit (PSU), order this capacitors http://www.ebay.com/itm/Repair-Kit-RCA-L32WD22-LCD-TV-Capacitors-/230637983468?pt=LH_DefaultDomain_0&hash=item35b31856ec
or better if you can get a new PSU altogether, but doubt you can find one right now.
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